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• I don't understand the definition of side effects

  - by Chris Okyen

  I don't understand the wikipedia article on Side Effects: In computer science, a function or expression is said to have a side effect if, in addition to returning a value, it also 1.) Modifies some state or 2.) Has an observable interaction with calling functions or the outside world. I know an example of the first thing that causes a function or expression to have side effects - modifying a state Function and Expression modifying a state : 1.) foo(int X) { return x = x % x; } a = a + 1; What does 2.) - Has an observable interaction with calling functions or the outside world," mean? - Please give an example. The article continues on to say, "For example, a function might modify a global or static variable, modify one of its arguments, raise an exception, write data to a display or file, read data, or call other side-effecting functions...." Are all these examples, examples of 1.) - Modifiying some state , or are they also part of 2.) - Has an observable interaction with calling functions or the outside world?

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• Should you create a class within a method?

  - by Amndeep7

  I have made a program using Java that is an implementation of this project: http://nifty.stanford.edu/2009/stone-random-art/sml/index.html. Essentially, you create a mathematical expression and, using the pixel coordinate as input, make a picture. After I initially implemented this in serial, I then implemented it in parallel due to the fact that if the picture size is too large or if the mathematical expression is too complex (especially considering the fact that I made the expression recursively), it takes a really long time. During this process, I realized that I needed two classes which implemented the Runnable interface as I had to put in parameters for the run method, which you aren't allowed to do directly. One of these classes ended up being a medium sized static inner class (not large enough to make an independent class file for it though). The other though, just needed a few parameters to determine some indexes and the size of the for loop that I was making run in parallel - here it is: class DataConversionRunnable implements Runnable { int jj, kk, w; DataConversionRunnable(int column, int matrix, int wid) { jj = column; kk = matrix; w = wid; } public void run() { for(int i = 0; i < w; i++) colorvals[kk][jj][i] = (int) ((raw[kk][jj][i] + 1.0) * 255 / 2.0); increaseCounter(); } } My question is should I make it a static inner class or can I just create it in a method? What is the general programming convention followed in this case?

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• Working with Reporting Services Filters–Part 5: OR Logic

  - by smisner

  When you combine multiple filters, Reporting Services uses AND logic. Once upon a time, there was actually a drop-down list for selecting AND or OR between filters which was very confusing to people because often it was grayed out. Now that selection is gone, but no matter. It wouldn’t help us solve the problem that I want to describe today. As with many problems, Reporting Services gives us more than one way to apply OR logic in a filter. If I want a filter to include this value OR that value for the same field, one approach is to set up the filter is to use the IN operator as I explained in Part 1 of this series. But what if I want to base the filter on two different fields? I  need a different solution. Using the AdventureWorksDW2008R2 database, I have a report that lists product sales: Let’s say that I want to filter this report to show only products that are Bikes (a category) OR products for which sales were greater than $1,000 in a year. If I set up the filter like this: Expression Data Type Operator Value [Category] Text = Bikes [SalesAmount]   > 1000 Then AND logic is used which means that both conditions must be true. That’s not the result I want. Instead, I need to set up the filter like this: Expression Data Type Operator Value =Fields!EnglishProductCategoryName.Value = "Bikes" OR Fields!SalesAmount.Value > 1000 Boolean = =True The OR logic needs to be part of the expression so that it can return a Boolean value that we test against the Value. Notice that I have used =True rather than True for the value. The filtered report appears below. Any non-bike product appears only if the total sales exceed $1,000, whereas Bikes appear regardless of sales. (You can’t see it in this screenshot, but Mountain-400-W Silver, 38 has sales of $923 in 2007 but gets included because it is in the Bikes category.)

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• Changes to the LINQ-to-StreamInsight Dialect

  - by Roman Schindlauer

  In previous versions of StreamInsight (1.0 through 2.0), CepStream<> represents temporal streams of many varieties: Streams with ‘open’ inputs (e.g., those defined and composed over CepStream<T>.Create(string streamName) Streams with ‘partially bound’ inputs (e.g., those defined and composed over CepStream<T>.Create(Type adapterFactory, …)) Streams with fully bound inputs (e.g., those defined and composed over To*Stream – sequences or DQC) The stream may be embedded (where Server.Create is used) The stream may be remote (where Server.Connect is used) When adding support for new programming primitives in StreamInsight 2.1, we faced a choice: Add a fourth variety (use CepStream<> to represent streams that are bound the new programming model constructs), or introduce a separate type that represents temporal streams in the new user model. We opted for the latter. Introducing a new type has the effect of reducing the number of (confusing) runtime failures due to inappropriate uses of CepStream<> instances in the incorrect context. The new types are: IStreamable<>, which logically represents a temporal stream. IQStreamable<> : IStreamable<>, which represents a queryable temporal stream. Its relationship to IStreamable<> is analogous to the relationship of IQueryable<> to IEnumerable<>. The developer can compose temporal queries over remote stream sources using this type. The syntax of temporal queries composed over IQStreamable<> is mostly consistent with the syntax of our existing CepStream<>-based LINQ provider. However, we have taken the opportunity to refine certain aspects of the language surface. Differences are outlined below. Because 2.1 introduces new types to represent temporal queries, the changes outlined in this post do no impact existing StreamInsight applications using the existing types! SelectMany StreamInsight does not support the SelectMany operator in its usual form (which is analogous to SQL’s “CROSS APPLY” operator): static IEnumerable<R> SelectMany<T, R>(this IEnumerable<T> source, Func<T, IEnumerable<R>> collectionSelector) It instead uses SelectMany as a convenient syntactic representation of an inner join. The parameter to the selector function is thus unavailable. Because the parameter isn’t supported, its type in StreamInsight 1.0 – 2.0 wasn’t carefully scrutinized. Unfortunately, the type chosen for the parameter is nonsensical to LINQ programmers: static CepStream<R> SelectMany<T, R>(this CepStream<T> source, Expression<Func<CepStream<T>, CepStream<R>>> streamSelector) Using Unit as the type for the parameter accurately reflects the StreamInsight’s capabilities: static IQStreamable<R> SelectMany<T, R>(this IQStreamable<T> source, Expression<Func<Unit, IQStreamable<R>>> streamSelector) For queries that succeed – that is, queries that do not reference the stream selector parameter – there is no difference between the code written for the two overloads: from x in xs from y in ys select f(x, y) Top-K The Take operator used in StreamInsight causes confusion for LINQ programmers because it is applied to the (unbounded) stream rather than the (bounded) window, suggesting that the query as a whole will return k rows: (from win in xs.SnapshotWindow() from x in win orderby x.A select x.B).Take(k) The use of SelectMany is also unfortunate in this context because it implies the availability of the window parameter within the remainder of the comprehension. The following compiles but fails at runtime: (from win in xs.SnapshotWindow() from x in win orderby x.A select win).Take(k) The Take operator in 2.1 is applied to the window rather than the stream: Before After (from win in xs.SnapshotWindow() from x in win orderby x.A select x.B).Take(k) from win in xs.SnapshotWindow() from b in     (from x in win     orderby x.A     select x.B).Take(k) select b Multicast We are introducing an explicit multicast operator in order to preserve expression identity, which is important given the semantics about moving code to and from StreamInsight. This also better matches existing LINQ dialects, such as Reactive. This pattern enables expressing multicasting in two ways: Implicit Explicit var ys = from x in xs          where x.A > 1          select x; var zs = from y1 in ys          from y2 in ys.ShiftEventTime(_ => TimeSpan.FromSeconds(1))          select y1 + y2; var ys = from x in xs          where x.A > 1          select x; var zs = ys.Multicast(ys1 =>     from y1 in ys1     from y2 in ys1.ShiftEventTime(_ => TimeSpan.FromSeconds(1))     select y1 + y2; Notice the product translates an expression using implicit multicast into an expression using the explicit multicast operator. The user does not see this translation. Default window policies Only default window policies are supported in the new surface. Other policies can be simulated by using AlterEventLifetime. Before After xs.SnapshotWindow(     WindowInputPolicy.ClipToWindow,     SnapshotWindowInputPolicy.Clip) xs.SnapshotWindow() xs.TumblingWindow(     TimeSpan.FromSeconds(1),     HoppingWindowOutputPolicy.PointAlignToWindowEnd) xs.TumblingWindow(     TimeSpan.FromSeconds(1)) xs.TumblingWindow(     TimeSpan.FromSeconds(1),     HoppingWindowOutputPolicy.ClipToWindowEnd) Not supported … LeftAntiJoin Representation of LASJ as a correlated sub-query in the LINQ surface is problematic as the StreamInsight engine does not support correlated sub-queries (see discussion of SelectMany). The current syntax requires the introduction of an otherwise unsupported ‘IsEmpty()’ operator. As a result, the pattern is not discoverable and implies capabilities not present in the server. The direct representation of LASJ is used instead: Before After from x in xs where     (from y in ys     where x.A > y.B     select y).IsEmpty() select x xs.LeftAntiJoin(ys, (x, y) => x.A > y.B) from x in xs where     (from y in ys     where x.A == y.B     select y).IsEmpty() select x xs.LeftAntiJoin(ys, x => x.A, y => y.B) ApplyWithUnion The ApplyWithUnion methods have been deprecated since their signatures are redundant given the standard SelectMany overloads: Before After xs.GroupBy(x => x.A).ApplyWithUnion(gs => from win in gs.SnapshotWindow() select win.Count()) xs.GroupBy(x => x.A).SelectMany(     gs =>     from win in gs.SnapshotWindow()     select win.Count()) xs.GroupBy(x => x.A).ApplyWithUnion(gs => from win in gs.SnapshotWindow() select win.Count(), r => new { r.Key, Count = r.Payload }) from x in xs group x by x.A into gs from win in gs.SnapshotWindow() select new { gs.Key, Count = win.Count() } Alternate UDO syntax The representation of UDOs in the StreamInsight LINQ dialect confuses cardinalities. Based on the semantics of user-defined operators in StreamInsight, one would expect to construct queries in the following form: from win in xs.SnapshotWindow() from y in MyUdo(win) select y Instead, the UDO proxy method is referenced within a projection, and the (many) results returned by the user code are automatically flattened into a stream: from win in xs.SnapshotWindow() select MyUdo(win) The “many-or-one” confusion is exemplified by the following example that compiles but fails at runtime: from win in xs.SnapshotWindow() select MyUdo(win) + win.Count() The above query must fail because the UDO is in fact returning many values per window while the count aggregate is returning one. Original syntax New alternate syntax from win in xs.SnapshotWindow() select win.UdoProxy(1) from win in xs.SnapshotWindow() from y in win.UserDefinedOperator(() => new Udo(1)) select y -or- from win in xs.SnapshotWindow() from y in win.UdoMacro(1) select y Notice that this formulation also sidesteps the dynamic type pitfalls of the existing “proxy method” approach to UDOs, in which the type of the UDO implementation (TInput, TOuput) and the type of its constructor arguments (TConfig) need to align in a precise and non-obvious way with the argument and return types for the corresponding proxy method. UDSO syntax UDSO currently leverages the DataContractSerializer to clone initial state for logical instances of the user operator. Initial state will instead be described by an expression in the new LINQ surface. Before After xs.Scan(new Udso()) xs.Scan(() => new Udso()) Name changes ShiftEventTime => AlterEventStartTime: The alter event lifetime overload taking a new start time value has been renamed. CountByStartTimeWindow => CountWindow

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• HTMLUNIT Facebook javascript warning

  - by Shin

  Hi I am trying to create simple application that would be able to search people on facebook using given e-mail. I am already able to log into an account using the HTMLunit tool and even create a page, which should throw result of my search. But when I try to print the result as XML the file is missing some blocks of javascript results (I can tell that they are missing by comparing file created by my application and source code, that can be viewed by using IE) Is there any way around this? I just need to get the same result IE's showsource function does. Thanks a lot. During execution of file, I am getting these WARNINGS: 1.4.2010 23:25:14 com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify WARNING: Expected content type of 'application/javascript' or 'application/ecmascript' for remotely loaded JavaScript element at 'https://s-static.ak.facebook.com/rsrc.php/z49PH/hash/9p47jvzp.js', but got 'application/x-javascript'. 21.4.2010 23:25:14 com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify WARNING: Expected content type of 'application/javascript' or 'application/ecmascript' for remotely loaded JavaScript element at 'https://s-static.ak.facebook.com/rsrc.php/z5N5C/hash/dhdy6xq3.js', but got 'application/x-javascript'. 21.4.2010 23:25:14 com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify WARNING: Expected content type of 'application/javascript' or 'application/ecmascript' for remotely loaded JavaScript element at 'https://s-static.ak.facebook.com/rsrc.php/z4TLI/hash/9ucb5trt.js', but got 'application/x-javascript'. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify WARNING: Expected content type of 'application/javascript' or 'application/ecmascript' for remotely loaded JavaScript element at 'http://static.ak.fbcdn.net/rsrc.php/z49PH/hash/9p47jvzp.js', but got 'application/x-javascript'. And then a lot of CSS errors 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [44:92] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [44:92] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [51:75] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [51:75] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [161:62] Error in style rule. Invalid token ":". Was expecting one of: <S>, "}", <COMMA>, ";", "/", <PLUS>, "-", <HASH>, <STRING>, <URI>, "!", "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [161:62] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [134:25] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [134:25] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [140:175] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [140:175] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [157:38] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [158:128] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [158:128] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [197:16] Error in pseudo class or element. Invalid token ":". Was expecting one of: <FUNCTION>, <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [197:16] Ignoring the whole rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [218:58] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [218:58] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [349:141] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [349:141] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [356:101] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [356:106] Error in style rule. Invalid token "opacity". Was expecting one of: "}", ";". 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [356:106] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [360:87] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [360:93] Error in style rule. Invalid token "opacity". Was expecting one of: "}", ";". 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [360:93] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [365:39] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [365:43] Error in style rule. Invalid token "left". Was expecting one of: "}", ";". 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [365:43] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [423:51] Error in style rule. Invalid token "~". Was expecting one of: <S>, <LBRACE>, <COMMA>, <PLUS>, <GREATER>, <IDENT>, "*", <HASH>, ".", "[", ":". 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [423:51] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [466:135] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [466:135] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [501:30] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [501:30] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [584:59] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [584:64] Error in style rule. Invalid token "opacity". Was expecting one of: "}", ";". 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [584:64] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [585:36] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [585:36] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [592:120] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [592:125] Error in style rule. Invalid token "opacity". Was expecting one of: "}", ";". 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [592:125] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [598:44] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [598:48] Error in style rule. Invalid token "left". Was expecting one of: "}", ";". 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [598:48] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [601:52] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [601:52] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [637:89] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [637:89] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [648:56] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [648:56] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [656:289] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [656:289] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [660:48] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [660:55] Error in style rule. Invalid token "-ms-filter". Was expecting one of: "}", ";". 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [660:55] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [664:29] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [664:29] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [669:22] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [669:22] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [673:231] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [673:231] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [674:17] Error in pseudo class or element. Invalid token ":". Was expecting one of: <FUNCTION>, <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [674:17] Ignoring the whole rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [690:81] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [690:87] Error in style rule. Invalid token "-ms-filter". Was expecting one of: "}", ";". 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [690:87] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [693:84] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [693:91] Error in style rule. Invalid token "-ms-filter". Was expecting one of: "}", ";". 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [693:91] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [695:32] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [695:32] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [702:32] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [702:32] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [703:17] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [703:17] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [705:166] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [705:166] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [706:21] Error in pseudo class or element. Invalid token ":". Was expecting one of: <FUNCTION>, <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [706:21] Ignoring the whole rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [101:1] Error in declaration. Invalid token "}". Was expecting one of: <S>, ":". 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [101:2] Error in style rule. Invalid token "\n". Was expecting one of: <S>, "}", ";". 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [101:2] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [185:39] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [185:39] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [186:38] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [186:38] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [235:84] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [235:84] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [290:26] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [290:26] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [291:70] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [291:70] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [298:52] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [298:52] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [299:48] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [299:48] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [305:50] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [305:50] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [306:69] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [306:69] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [307:89] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [307:89] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [309:83] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [309:83] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [317:84] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [317:84] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [473:215] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [473:215] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [475:137] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [475:137] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [480:78] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [480:78] Ignoring the following declarations in this rule. 21.4.2010 23:25:23 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [484:78] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:24 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [484:78] Ignoring the following declarations in this rule. 21.4.2010 23:25:24 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [486:91] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:24 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [486:91] Ignoring the following declarations in this rule. 21.4.2010 23:25:24 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [498:16] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:24 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [498:16] Ignoring the following declarations in this rule. 21.4.2010 23:25:24 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [506:33] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:24 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [506:33] Ignoring the following declarations in this rule. 21.4.2010 23:25:24 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [508:14] Error in pseudo class or element. Invalid token ":". Was expecting one of: <FUNCTION>, <IDENT>. 21.4.2010 23:25:24 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [508:14] Ignoring the whole rule. 21.4.2010 23:25:24 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [567:82] Error in expression. Invalid token "=". Was expecting one of: <S>, <COMMA>, "/", <PLUS>, "-", <HASH>, <STRING>, ")", <URI>, "inherit", <EMS>, <EXS>, <LENGTH_PX>, <LENGTH_CM>, <LENGTH_MM>, <LENGTH_IN>, <LENGTH_PT>, <LENGTH_PC>, <ANGLE_DEG>, <ANGLE_RAD>, <ANGLE_GRAD>, <TIME_MS>, <TIME_S>, <FREQ_HZ>, <FREQ_KHZ>, <DIMENSION>, <PERCENTAGE>, <NUMBER>, <FUNCTION>, <IDENT>. 21.4.2010 23:25:24 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [567:86] Error in style rule. Invalid token "opacity". Was expecting one of: "}", ";". 21.4.2010 23:25:24 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning: null [567:86] Ignoring the following declarations in this rule. 21.4.2010 23:25:24 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler error WARNING: CSS error: null [572:159] Error in style rule. Invalid token "*". Was expecting one of: <S>, "}", ";", <IDENT>. 21.4.2010 23:25:24 com.gargoylesoftware.htmlunit.DefaultCssErrorHandler warning WARNING: CSS warning:

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• c#: Design advice. Using DataTable or List<MyObject> for a generic rule checker

  - by Andrew White

  Hi, I have about 100,000 lines of generic data. Columns/Properties of this data are user definable and are of the usual data types (string, int, double, date). There will be about 50 columns/properties. I have 2 needs: To be able to calculate new columns/properties using an expression e.g. Column3 = Column1 * Column2. Ultimately I would like to be able to use external data using a callback, e.g. Column3 = Column1 * GetTemperature The expression is relatively simple, maths operations, sum, count & IF are the only necessary functions. To be able to filter/group the data and perform aggregations e.g. Sum(Data.Column1) Where(Data.Column2 == "blah") As far as I can see I have two options: 1. Using a DataTable. = Point 1 above is achieved by using DataColumn.Expression = Point 2 above is acheived by using DataTable.DefaultView.RowFilter & C# code 2. Using a List of generic Objects each with a Dictionary< string, object to store the values. = Point 1 could be achieved by something like NCalc = Point 2 is achieved using LINQ DataTable: Pros: DataColumn.Expression is inbuilt Cons: RowFilter & coding c# is not as "nice" as LINQ, DataColumn.Expression does not support callbacks(?) = workaround could be to get & replace external value when creating the calculated column GenericList: Pros: LINQ syntax, NCalc supports callbacks Cons: Implementing NCalc/generic calc engine Based on the above I would think a GenericList approach would win, but something I have not factored in is the performance which for some reason I think would be better with a datatable. Does anyone have a gut feeling / experience with LINQ vs. DataTable performance? How about NCalc? As I said there are about 100,000 rows of data, with 50 columns, of which maybe 20 are calculated. In total about 50 rules will be run against the data, so in total there will be 5 million row/object scans. Would really appreciate any insights. Thx. ps. Of course using a database + SQL & Views etc. would be the easiest solution, but for various reasons can't be implemented.

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• Intermittent "Specified cast is invalid" with StructureMap injected data context

  - by FreshCode

  I am intermittently getting an System.InvalidCastException: Specified cast is not valid. error in my repository layer when performing an abstracted SELECT query mapped with LINQ. The error can't be caused by a mismatched database schema since it works intermittently and it's on my local dev machine. Could it be because StructureMap is caching the data context between page requests? If so, how do I tell StructureMap v2.6.1 to inject a new data context argument into my repository for each request? Update: I found this question which correlates my hunch that something was being re-used. Looks like I need to call Dispose on my injected data context. Not sure how I'm going to do this to all my repositories without copypasting a lot of code. Edit: These errors are popping up all over the place whenever I refresh my local machine too quickly. Doesn't look like it's happening on my remote deployment box, but I can't be sure. I changed all my repositories' StructureMap life cycles to HttpContextScoped() and the error persists. Code: public ActionResult Index() { // error happens here, which queries my page repository var page = _branchService.GetPage("welcome"); if (page != null) ViewData["Welcome"] = page.Body; ... } Repository: GetPage boils down to a filtered query mapping in my page repository. public IQueryable<Page> GetPages() { var pages = from p in _db.Pages let categories = GetPageCategories(p.PageId) let revisions = GetRevisions(p.PageId) select new Page { ID = p.PageId, UserID = p.UserId, Slug = p.Slug, Title = p.Title, Description = p.Description, Body = p.Text, Date = p.Date, IsPublished = p.IsPublished, Categories = new LazyList<Category>(categories), Revisions = new LazyList<PageRevision>(revisions) }; return pages; } where _db is an injected data context as an argument, stored in a private variable which I reuse for SELECT queries. Error: Specified cast is not valid. Exception Details: System.InvalidCastException: Specified cast is not valid. Stack Trace: [InvalidCastException: Specified cast is not valid.] System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult) +4539 System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries) +207 System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +500 System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute(Expression expression) +50 System.Linq.Queryable.FirstOrDefault(IQueryable`1 source) +383 Manager.Controllers.SiteController.Index() in C:\Projects\Manager\Manager\Controllers\SiteController.cs:68 lambda_method(Closure , ControllerBase , Object[] ) +79 System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +258 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +39 System.Web.Mvc.<>c__DisplayClassd.<InvokeActionMethodWithFilters>b__a() +125 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +640 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +312 System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +709 System.Web.Mvc.Controller.ExecuteCore() +162 System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__4() +58 System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +20 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +453 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +371

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• Silverlight Cream for January 12, 2011 -- #1025

  - by Dave Campbell

  In this Issue: Amyo Kabir, Rob Eisenberg, Doug Rathbone, John Papa, Jeff Blankenburg(-2-), Mike Taulty, Peter Kuhn, Laurent Bugnion, Vangos Pterneas, and Senthil Kumar. Above the Fold: Silverlight: "Silverlight Popup sample" Amyo Kabir WP7: "Navigation in a #WP7 application with MVVM Light" Laurent Bugnion XNA: "XNA for Silverlight developers: Part 0 - Why should I care?" Peter Kuhn Shoutouts: Mohamed Mosallem posted a video of an Expression Blend demo he gave recently: Expression Blend Demo Rob Eisenberg posted the winners of the Caliburn.Micro Contest he was running .. and a nice bunch of swag too! Announcing the Caliburn.Micro Contest Winners! Dan Moyer is a LightSwitch enthusiast and writes Why I Believe Visual Studio LightSwitch will be a Win... good well-thought-out and written take on Lightswitch. From SilverlightCream.com: Silverlight Popup sample Amyo Kabir has a post up that is short on description but long on demo and the code is available... put this in the 'a picture is worth 1,000 words category' :) Caliburn.Micro Soup to Nuts Part 7 - All About Conventions The 7th episode of Rob Eisenberg's tutorial series on Caliburn.Micro is up. This episode about some of the conventions that you get out-of-the-box with Caliburn.Micro, what it'll do for you, and how you can modify the behavior of the convention to suit your own taste/style. Two little tips for working with Silverlight chart DateTime Axes Doug Rathbone has been working with the Toolkit Charts for WP7 and finding it difficult to get the info he needs, and now that he's worked it out... he's sharing... particularly information about DateTimeAxis. Silverlight TV 56: WCF RIA Services and Azure The first Silverlight TV of 2011 was John Papa discussing WCF RIA Services and Azure with Saurabh Plant. What I Learned In WP7 – Issue 14 As usual, Jeff Blankenburg is a couple ahead of me... his Issue 14 is about some panorama trickery... like navigating to a specific place in one, or preventing wrapping. What I Learned In WP7 – Issue 15 In Jeff Blankenburg's latest WP7 post, he's sharing some interesting insight into Trial Mode and app sales... from the standpoint of someone selling apps. Blend Bits 20–Group Into Mike Taulty has Part 20 of his Blend Bits series up. This one is demonstrating grouping, and what all can be accomplished (or not) with grouping in Blend. XNA for Silverlight developers: Part 0 - Why should I care? Peter Kuhn has the beginning of a series on WP7 and XNA up at SilverlightShow... this looks to be a good intro and way to get your head wrapped around XNA on the phone. Navigation in a #WP7 application with MVVM Light Laurent Bugnion discusses WP7 navigation via MVVM Light, resolving many of the communication/navigation complexities you can get involved in without a tool like his. Motion detection in Silverlight Vangos Pterneas has a followup postto the one on facial detection... this one is on Motion Detection in Silverlight. If you've got a webcam hooked up, you can give a demo app a dance via a link he has in the post. Adding ApplicationBar in Windows Phone 7 using Expression Blend Senthil Kumar follows up a post about using VS to add an application bar to a WP7 app with this one using Expression Blend Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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• Get Exchange Online Mailbox Size in GB

  - by Brian Jackett

  As mentioned in my previous post I was recently working with a customer to get started with Exchange Online PowerShell commandlets.  In this post I wanted to follow up and show one example of a difference in output from commandlets in Exchange 2010 on-premises vs. Exchange Online.   Problem    The customer was interested in getting the size of mailboxes in GB.  For Exchange on-premises this is fairly easy.  A fellow PFE Gary Siepser wrote an article explaining how to accomplish this (click here).  Note that Gary’s script will not work when remoting from a local machine that doesn’t have the Exchange object model installed.  A similar type of scenario exists if you are executing PowerShell against Exchange Online.  The data type for TotalItemSize  being returned (ByteQuantifiedSize) exists in the Exchange namespace.  If the PowerShell session doesn’t have access to that namespace (or hasn’t loaded it) PowerShell works with an approximation of that data type.    The customer found a sample script on this TechNet article that they attempted to use (minor edits by me to fit on page and remove references to deleted item size.)   Get-Mailbox -ResultSize Unlimited | Get-MailboxStatistics | Select DisplayName,StorageLimitStatus, ` @{name="TotalItemSize (MB)"; expression={[math]::Round( ` ($_.TotalItemSize.Split("(")[1].Split(" ")[0].Replace(",","")/1MB),2)}}, ` ItemCount | Sort "TotalItemSize (MB)" -Descending | Export-CSV "C:\My Documents\All Mailboxes.csv" -NoTypeInformation     The script is targeted to Exchange 2010 but fails for Exchange Online.  In Exchange Online when referencing the TotalItemSize property though it does not have a Split method which ultimately causes the script to fail.   Solution    A simple solution would be to add a call to the ToString method off of the TotalItemSize property (in bold on line 5 below).   Get-Mailbox -ResultSize Unlimited | Get-MailboxStatistics | Select DisplayName,StorageLimitStatus, ` @{name="TotalItemSize (MB)"; expression={[math]::Round( ` ($_.TotalItemSize.ToString().Split("(")[1].Split(" ")[0].Replace(",","")/1MB),2)}}, ` ItemCount | Sort "TotalItemSize (MB)" -Descending | Export-CSV "C:\My Documents\All Mailboxes.csv" -NoTypeInformation      This fixes the script to run but the numerous string replacements and splits are an eye sore to me.  I attempted to simplify the string manipulation with a regular expression (more info on regular expressions in PowerShell click here).  The result is a workable script that does one nice feature of adding a new member to the mailbox statistics called TotalItemSizeInBytes.  With this member you can then convert into any byte level (KB, MB, GB, etc.) that suits your needs.  You can download the full version of this script below (includes commands to connect to Exchange Online session). $UserMailboxStats = Get-Mailbox -RecipientTypeDetails UserMailbox ` -ResultSize Unlimited | Get-MailboxStatistics $UserMailboxStats | Add-Member -MemberType ScriptProperty -Name TotalItemSizeInBytes ` -Value {$this.TotalItemSize -replace "(.*\()|,| [a-z]*\)", ""} $UserMailboxStats | Select-Object DisplayName,@{Name="TotalItemSize (GB)"; ` Expression={[math]::Round($_.TotalItemSizeInBytes/1GB,2)}}   Conclusion    Moving from on-premises to the cloud with PowerShell (and PowerShell remoting in general) can sometimes present some new challenges due to what you have access to.  This means that you must always test your code / scripts.  I still believe that not having to physically RDP to a server is a huge gain over some of the small hurdles you may encounter during the transition.  Scripting is the future of administration and makes you more valuable.  Hopefully this script and the concepts presented help you be a better admin / developer.         -Frog Out     Links The Get-MailboxStatistics Cmdlet, the TotalitemSize Property, and that pesky little “b” http://blogs.technet.com/b/gary/archive/2010/02/20/the-get-mailboxstatistics-cmdlet-the-totalitemsize-property-and-that-pesky-little-b.aspx   View Mailbox Sizes and Mailbox Quotas Using Windows PowerShell http://technet.microsoft.com/en-us/exchangelabshelp/gg576861#ViewAllMailboxes   Regular Expressions with Windows PowerShell http://www.regular-expressions.info/powershell.html   “I don’t always test my code…” image http://blogs.pinkelephant.com/images/uploads/conferences/I-dont-always-test-my-code-But-when-I-do-I-do-it-in-production.jpg   The One Thing: Brian Jackett and SharePoint 2010 http://www.youtube.com/watch?v=Sg_h66HMP9o

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• Windows Phone 7 Series - Tools and Resources

  - by TechTwaddle

  Unless you've been living in the caves of Lascaux for the past couple of days, you probably know what's happening in the world of Windows Phone. Microsoft unveiled the developer tools required to develop applications and games for Windows Phone 7 at MIX10 a couple of days back. Silverlight and XNA being the major frameworks, no big surprise there. And the best news of all is that all the development tools are free! So if you are planning to develop apps for Windows Phone 7, read on. The first place, or more appropriately hub, for you is the Windows Phone Developer Portal. It has most of the information you need to get you started. Now there is a ton of information available at other places too. In this post, I take time to put all the information that I found useful at one place, and I'll keep updating this as and when I find new stuff.   Setting up the development environment 1. Install Windows Phone Developer Tools CTP (Community Technology Preview) This will install Visual Studio 2010 Express, Silverlight, XNA framework and emulator for Windows Phone 7. It also installs a few support tools. 2. Expression Blend 4 for Windows Phone:     - Install Expression Blend 4 beta     - Install Expression Blend Add-in Preview for Windows Phone     - Install Expression Blend SDK Preview for Windows Phone Installing the above tools should set your machine up for development. I installed the tools on my Windows Vista SP1 machine and the process went smoothly without running into any major hitch. Note that the tools won't install on Windows XP, read the release notes of the CTP. Resources and Documentation 1. Microsoft Windows Phone 7 Series Developer Training Kit 2. Programming Windows Phone 7 Series by Charles Petzold. Contains few chapters only. Gives a good preview. 3. MSDN documentation for Windows Phone 7 Development 4. A sample chapter from Learning Windows Phone Programming [PDF] by Yochay Kiriaty and Jaime Rodriguez. Complete book will be available at a later time. 5. Windows Phone 7 Developer Forum - where you can ask questions and problems you run into and the experts are there to help you. 6. For Silverlight visit silverlight.net and for XNA game development, the XNA Creators Club is the place to go, also make sure you follow Michael Klutcher's and Shawn Hargreaves' blog. 7. And finally the MIX'10 website. Most of the sessions will be available for download later (some are already available). Click on the Windows Phone tag to get all the session details and downloads.   If you are completely new to Silverlight and XNA (like me), and C# makes some sense to you then I suggest you go through the Developer Training Kit. It gives a good start and ramps you up pretty quickly.

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• BizTalk Testing Series - The xpath Function

  - by Michael Stephenson

  Background While the xpath function in a BizTalk orchestration is a very powerful feature I have often come across the situation where someone has hard coded an xpath expression in an orchestration. If you have read some of my previous posts about testing I've tried to get across the general theme like test-driven or test-assisted development approaches where the underlying principle is that your building up your solution of small well tested units that are put together and the resulting solution is usually quite robust. You will be finding more bugs within your unit tests and fewer outside of your team. The thing I don't like about the xpath functions usual usage is when you come across an orchestration which has something like the below snippet in an expression or assign shape: string result = xpath(myMessage,"string(//Order/OrderItem/ProductName)"); My main issue with this is that the xpath statement is hard coded in the orchestration and you don't really know it works until you are running the orchestration. Some of the problems I think you end up with are: You waste time with lengthy debugging of the orchestration when your statement isn't working You might not know the function isn't working quite as expected because the testable unit around it is big You are much more open to regression issues if your schema changes     Approach to Testing The technique I usually follow is to hold the xpath statement as a constant in a helper class or to format a constant with a helper function to get the actual xpath statement. It is then used by the orchestration like follows. string result = xpath(myMessage, MyHelperClass.ProductNameXPathStatement); This means that because the xpath statement is available outside of the orchestration it now becomes testable in its own right. This means: I can test it in its own right I'm less likely to waste time tracking down problems caused by an error in the statement I can reduce the risk or regression issuess I'm now able to implement some testing around my xpath statements which usually are something like the following:    The test will use a sample xml file The sample will be validated against the schema The test will execute the xpath statement and then check the results are as expected     Walk-through BizTalk uses the XPathNavigator internally behind the xpath function to implement the queries you will usually use using the navigators select or evaluate functions. In the sample (link at bottom) I have a small solution which contains a schema from which I have generated a sample instance. I will then use this instance as the basis for my tests.     In the below diagram you can see the helper class which I've encapsulated my xpath expressions in, and some helper functions which will format the expression in the case of a repeating node which would want to inject an index into the xpath query.             I have then created a test class which has some functions to execute some queries against my sample xml file. An example of this is below.         In the test class I have a couple of helper functions which will execute the xpath expressions in a similar way to BizTalk. You could have a proper helper class to do this if you wanted.         You can see now in the BizTalk expression editor I can use these functions alongside the xpath function.         Conclusion I hope you can see with very little effort you can make your life much easier by testing xpath statements outside of an orchestration rather than using them directly hard coded into the orchestration.     This can also save you lots of pain longer term because your build should break if your schema changes unexpectedly causing these xpath tests to fail where as your tests around the orchestration will be more difficult to troubleshoot and workout the cause of the problem.     Sample Link The sample is available from the following link: http://code.msdn.microsoft.com/testbtsxpathfunction     Other Tools On the subject of using the xpath function, if you don't already use it the below tool is very useful for creating your xpath statements (thanks BizBert) http://www.bizbert.com/bizbert/2007/11/30/XPath+The+Hidden+Language+Of+BizTalk.aspx

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• Type checking and recursive types (Writing the Y combinator in Haskell/Ocaml)

  - by beta

  When explaining the Y combinator in the context of Haskell, it's usually noted that the straight-forward implementation won't type-check in Haskell because of its recursive type. For example, from Rosettacode [1]: The obvious definition of the Y combinator in Haskell canot be used because it contains an infinite recursive type (a = a -> b). Defining a data type (Mu) allows this recursion to be broken. newtype Mu a = Roll { unroll :: Mu a -> a } fix :: (a -> a) -> a fix = \f -> (\x -> f (unroll x x)) $ Roll (\x -> f (unroll x x)) And indeed, the “obvious” definition does not type check: ?> let fix f g = (\x -> \a -> f (x x) a) (\x -> \a -> f (x x) a) g <interactive>:10:33: Occurs check: cannot construct the infinite type: t2 = t2 -> t0 -> t1 Expected type: t2 -> t0 -> t1 Actual type: (t2 -> t0 -> t1) -> t0 -> t1 In the first argument of `x', namely `x' In the first argument of `f', namely `(x x)' In the expression: f (x x) a <interactive>:10:57: Occurs check: cannot construct the infinite type: t2 = t2 -> t0 -> t1 In the first argument of `x', namely `x' In the first argument of `f', namely `(x x)' In the expression: f (x x) a (0.01 secs, 1033328 bytes) The same limitation exists in Ocaml: utop # let fix f g = (fun x a -> f (x x) a) (fun x a -> f (x x) a) g;; Error: This expression has type 'a -> 'b but an expression was expected of type 'a The type variable 'a occurs inside 'a -> 'b However, in Ocaml, one can allow recursive types by passing in the -rectypes switch: -rectypes Allow arbitrary recursive types during type-checking. By default, only recursive types where the recursion goes through an object type are supported. By using -rectypes, everything works: utop # let fix f g = (fun x a -> f (x x) a) (fun x a -> f (x x) a) g;; val fix : (('a -> 'b) -> 'a -> 'b) -> 'a -> 'b = <fun> utop # let fact_improver partial n = if n = 0 then 1 else n*partial (n-1);; val fact_improver : (int -> int) -> int -> int = <fun> utop # (fix fact_improver) 5;; - : int = 120 Being curious about type systems and type inference, this raises some questions I'm still not able to answer. First, how does the type checker come up with the type t2 = t2 -> t0 -> t1? Having come up with that type, I guess the problem is that the type (t2) refers to itself on the right side? Second, and perhaps most interesting, what is the reason for the Haskell/Ocaml type systems to disallow this? I guess there is a good reason since Ocaml also will not allow it by default even if it can deal with recursive types if given the -rectypes switch. If these are really big topics, I'd appreciate pointers to relevant literature. [1] http://rosettacode.org/wiki/Y_combinator#Haskell

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• SQL Server: Writing CASE expressions properly when NULLs are involved

  - by Mladen Prajdic

  We’ve all written a CASE expression (yes, it’s an expression and not a statement) or two every now and then. But did you know there are actually 2 formats you can write the CASE expression in? This actually bit me when I was trying to add some new functionality to an old stored procedure. In some rare cases the stored procedure just didn’t work correctly. After a quick look it turned out to be a CASE expression problem when dealing with NULLS. In the first format we make simple “equals to” comparisons to a value: SELECT CASE <value> WHEN <equals this value> THEN <return this> WHEN <equals this value> THEN <return this> -- ... more WHEN's here ELSE <return this> END Second format is much more flexible since it allows for complex conditions. USE THIS ONE! SELECT CASE WHEN <value> <compared to> <value> THEN <return this> WHEN <value> <compared to> <value> THEN <return this> -- ... more WHEN's here ELSE <return this> END Now that we know both formats and you know which to use (the second one if that hasn’t been clear enough) here’s an example how the first format WILL make your evaluation logic WRONG. Run the following code for different values of @i. Just comment out any 2 out of 3 “SELECT @i =” statements. DECLARE @i INTSELECT  @i = -1 -- first resultSELECT  @i = 55 -- second resultSELECT  @i = NULL -- third resultSELECT @i AS OriginalValue, -- first CASE format. DON'T USE THIS! CASE @i WHEN -1 THEN '-1' WHEN NULL THEN 'We have a NULL!' ELSE 'We landed in ELSE' END AS DontUseThisCaseFormatValue, -- second CASE format. USE THIS! CASE WHEN @i = -1 THEN '-1' WHEN @i IS NULL THEN 'We have a NULL!' ELSE 'We landed in ELSE' END AS UseThisCaseFormatValue When the value of @i is –1 everything works as expected, since both formats go into the –1 WHEN branch. When the value of @i is 55 everything again works as expected, since both formats go into the ELSE branch. When the value of @i is NULL the problems become evident. The first format doesn’t go into the WHEN NULL branch because it makes an equality comparison between two NULLs. Because a NULL is an unknown value: NULL = NULL is false. That is why the first format goes into the ELSE Branch but the second format correctly handles the proper IS NULL comparison.   Please use the second more explicit format. Your future self will be very grateful to you when he doesn’t have to discover these kinds of bugs.

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• ASP NET MVC : "Cannot order by type 'System.Object'."

  - by rah.deex

  This is my code. I got this sample from the Internet and I tried to modify it. private void FillGridData() { //IQueryable<SVC> query = _customerService.GetQueryable(); _dataContext = new dbServiceModelDataContext(); var query = from m in _dataContext.SVCs select m; query = AddQuerySearchCriteria(query, _grid.SearchForm); int totalRows = query.Count(); _grid.Pager.Init(totalRows); if (totalRows == 0) { _grid.Data = new List<SVC>(); return; } query = AddQuerySorting(query, _grid.Sorter); query = AddQueryPaging(query, _grid.Pager); List<SVC> customers = query.ToList(); //***ERROR IN HERE***// _grid.Data = customers; } The error says "Cannot order by type 'System.Object'.", what is the matter? Do you have solution for me? This is The AddQuerySorting Method THE PROBLEM IS IN HERE is there anything wrong about the code? :( private IQueryable<SVC> AddQuerySorting(IQueryable<SVC> query, Sorter sorter) { if (String.IsNullOrEmpty(sorter.SortField)) return query; //Used approach from http://www.singingeels.com/Articles/Self_Sorting_GridView_with_LINQ_Expression_Trees.aspx //instead of a long switch statement var param = Expression.Parameter(typeof(SVC), "customer"); var sortExpression = Expression.Lambda<Func<SVC, object>> (Expression.Convert(Expression.Property(param, sorter.SortField), typeof(object)), param); if (sorter.SortDirection == SortDirection.Asc) query = query.OrderBy(sortExpression); else query = query.OrderByDescending(sortExpression); return query; } here is AddQueryPaging Method private IQueryable<SVC> AddQueryPaging(IQueryable<SVC> query, Pager pager) { if (pager.TotalPages == 0) return query; query = query.Skip((pager.CurrentPage - 1) * pager.PageSize) .Take(pager.PageSize); return query; }

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• How to create basic Adobe Illustrator files programatically?

  - by Jonas Follesø

  I need to create a really basic Adobe Illustrator file on the clipboard that I can paste in Adobe Illustrator or Expression Design. I'm looking for code samples on how to programaticaly generate Adobe Illustrator Files, preferably from C# or some other .NET language (but at the moment any language goes). I have found the Adobe Illustrator 3 File Format documentation online but it's allot to digest for this simple scenario. I don't want to depend on the actual Adobe Illustrator program (COM interop for instance) to generate my documents. Must be pure code. The code is for an Expression Studio addin, and I need to be able to create something on the clipboard I can paste into Expression Design. After looking at the formats Expression Design puts on the clipboard when copying a basic shape I've concluded that ADOBE AI3 i the best one to use (the others are either rendered images, or cfXaml that you cannot paste INTO Design). So based on this I can't use SWG which would probably been easier. Another idea might be to use a PDF component as the AI and PDF format is supposed to be compatible? I'm also finding some references to a format called "Adobe Illustrator Clipboard Format" (AICB), but can't find allot of documentation about it.

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• How to Process Lambda Expressions Passed as Argument Into Method - C# .NET 3.5

  - by Sunday Ironfoot

  My knowledge of Lambda expressions is a bit shaky, while I can write code that uses Lambda expressions (aka LINQ), I'm trying to write my own method that takes a few arguments that are of type Lambda Expression. Background: I'm trying to write a method that returns a Tree Collection of objects of type TreeItem from literally ANY other object type. I have the following so far: public class TreeItem { public string Id { get; set; } public string Text { get; set; } public TreeItem Parent { get; protected set; } public IList<TreeItem> Children { get { // Implementation that returns custom TreeItemCollection type } } public static IList<TreeItem> GetTreeFromObject<T>(IList<T> items, Expression<Func<T, string>> id, Expression<Func<T, string>> text, Expression<Func<T, IList<T>>> childProperty) where T : class { foreach (T item in items) { // Errrm!?? What do I do now? } return null; } } ...which can be called via... IList<TreeItem> treeItems = TreeItem.GetTreeFromObject<Category>( categories, c => c.Id, c => c.Name, c => c.ChildCategories); I could replace the Expressions with string values, and just use reflection, but I'm trying to avoid this as I want to make it strongly typed. My reasons for doing this is that I have a control that accepts a List of type TreeItem, whereas I have dozens of different types that are all in a tree like structure, and don't want to write seperate conversion methods for each type (trying to adhere to the DRY principle). Am I going about this the right way? Is there a better way of doing this perhaps?

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• script to search and replace deprecated functions

  - by user573881

  Hi, I am using the following script to search and replace the deprecated functions in a file with the newer ones. 5 for strFile in `ls deprecated_functions_search_and_replace.txt ` 6 do 7 sed "s/ereg_replace[^\(]*(\([^,]*\),/preg_replace\1('#'.\2.'#',/g" $strFile > temp_file 8 mv $strFile $strFile".bakup" 9 mv temp_file $strFile 10 11 sed "s/eregi[^\(]*(\([^,]*\),/preg_match\1('#'.\2.'#i',/g" $strFile > temp_file 12 mv $strFile $strFile".bakup" 13 mv temp_file $strFile 14 15 sed "s/ereg[^\(]*(\([^,]*\),/preg_match\1('#'.\2.'#',/g" $strFile > temp_file 16 mv $strFile $strFile".bakup" 17 mv temp_file $strFile 18 19 sed "s/split[^\(]*(\([^,]*\),/preg_split\1('#'.\2.'#',/g" $strFile > temp_file 20 mv $strFile $strFile".bakup" 21 mv temp_file $strFile 22 23 sed "s/mysql_escape_string/mysql_real_escape_string/g" $strFile > temp_file 24 mv $strFile $strFile".bakup" 25 mv temp_file $strFile 26 27 sed "s/set_magic_quotes_runtime(0)/\/\/set_magic_quotes_runtime(0)/g" $strFile > temp_file 28 mv $strFile $strFile".bakup" 29 mv temp_file $strFile 30 31 sed "s/ini_get('safe_mode')/false/g" $strFile > temp_file 32 mv $strFile $strFile".bakup" 33 mv temp_file $strFile 34 35 sed "s/session_register('\(.*\)')/$_SESSION['\1']=$\1/g" $strFile > temp_file 36 mv $strFile $strFile".bakup" 37 mv temp_file $strFile 38 39 sed "s/session_unregister('\(.*\)')/$_SESSION['\1']=''/g" $strFile > temp_file 40 mv $strFile $strFile".bakup" 41 mv temp_file $strFile 42 43 done However, when I run this script I am getting an error saying: sed: -e expression #1, char 60: invalid reference \2 on `s' command's RHS sed: -e expression #1, char 52: invalid reference \2 on `s' command's RHS sed: -e expression #1, char 50: invalid reference \2 on `s' command's RHS sed: -e expression #1, char 51: invalid reference \2 on `s' command's RHS I am unable to figure out whats going wrong. Someone please help me. Regards.

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• error of integer overflow

  - by user308565

  This the part of my OpenGL code, I am getting an error for : struct Ball { float x; float y; float rot; float dir; bool rmv; Ball* next; }; Ball* curBall; void addBall() { if (balls==NULL) { balls=new Ball; balls->next=NULL; curBall=balls; } else { curBall->next=new Ball; curBall=curBall->next; curBall->next=NULL; } curBall->x=((float)rand()/(float)(RAND_MAX+1))*(ww-1) +1; curBall->y=((float)rand()/(float)(RAND_MAX+1))*(wh-1) +1; curBall->dir=((float)rand()/(float)(RAND_MAX+1))*(2*PI-1) +1; curBall->rot=((float)rand()/(float)(RAND_MAX+1))*(359) +1; curBall->rmv=false; } error : In function ‘void addBall()’: file.cpp:120: warning: integer overflow in expression file.cpp:121: warning: integer overflow in expression file.cpp:122: warning: integer overflow in expression file.cpp:123: warning: integer overflow in expression

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• How can I combine several Expressions into a fast method?

  - by chillitom

  Suppose I have the following expressions: Expression<Action<T, StringBuilder>> expr1 = (t, sb) => sb.Append(t.Name); Expression<Action<T, StringBuilder>> expr2 = (t, sb) => sb.Append(", "); Expression<Action<T, StringBuilder>> expr3 = (t, sb) => sb.Append(t.Description); I'd like to be able to compile these into a method/delegate equivalent to the following: void Method(T t, StringBuilder sb) { sb.Append(t.Name); sb.Append(", "); sb.Append(t.Description); } What is the best way to approach this? I'd like it to perform well, ideally with performance equivalent to the above method. UPDATE So, whilst it appears that there is no way to do this directly in C#3 is there a way to convert an expression to IL so that I can use it with System.Reflection.Emit?

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• Help with Boost Spirit ASTs

  - by Decmac04

  I am writing a small tool for analyzing simple B Machine substitutions as part of a college research work. The code successfully parse test inputs of the form mySubst := var1 + var2. However, I get a pop-up error message saying "This application has requested the Runtime to terminate it in an unusual way. " In the command prompt window, I get an "Assertion failed message". The main program is given below: // BMachineTree.cpp : Defines the entry point for the console application. // /*============================================================================= Copyright (c) 2010 Temitope Onunkun =============================================================================*/ /////////////////////////////////////////////////////////////////////////////// // // UUsing Boost Spririt Trees (AST) to parse B Machine Substitutions. // /////////////////////////////////////////////////////////////////////////////// #define BOOST_SPIRIT_DUMP_PARSETREE_AS_XML #include <boost/spirit/core.hpp> #include <boost/spirit/tree/ast.hpp> #include <boost/spirit/tree/tree_to_xml.hpp> #include "BMachineTreeGrammar.hpp" #include <iostream> #include <stack> #include <functional> #include <string> #include <cassert> #include <vector> #if defined(BOOST_SPIRIT_DUMP_PARSETREE_AS_XML) #include <map> #endif // Using AST to parse B Machine substitutions //////////////////////////////////////////////////////////////////////////// using namespace std; using namespace boost::spirit; typedef char const* iterator_t; typedef tree_match<iterator_t> parse_tree_match_t; typedef parse_tree_match_t::tree_iterator iter_t; //////////////////////////////////////////////////////////////////////////// string evaluate(parse_tree_match_t hit); string eval_machine(iter_t const& i); vector<string> dx; string evaluate(tree_parse_info<> info) { return eval_machine(info.trees.begin()); } string eval_machine(iter_t const& i) { cout << "In eval_machine. i->value = " << string(i->value.begin(), i->value.end()) << " i->children.size() = " << i->children.size() << endl; if (i->value.id() == substitution::leafValueID) { assert(i->children.size() == 0); // extract string tokens string leafValue(i->value.begin(), i->value.end()); dx.push_back(leafValue.c_str()); return leafValue.c_str(); } // else if (i->value.id() == substitution::termID) { if ( (*i->value.begin() == '*') || (*i->value.begin() == '/') ) { assert(i->children.size() == 2); dx.push_back( eval_machine(i->children.begin()) ); dx.push_back( eval_machine(i->children.begin()+1) ); return eval_machine(i->children.begin()) + " " + eval_machine(i->children.begin()+1); } // else assert(0); } else if (i->value.id() == substitution::expressionID) { if ( (*i->value.begin() == '+') || (*i->value.begin() == '-') ) { assert(i->children.size() == 2); dx.push_back( eval_machine(i->children.begin()) ); dx.push_back( eval_machine(i->children.begin()+1) ); return eval_machine(i->children.begin()) + " " + eval_machine(i->children.begin()+1); } else assert(0); } // else if (i->value.id() == substitution::simple_substID) { if (*i->value.begin() == (':' >> '=') ) { assert(i->children.size() == 2); dx.push_back( eval_machine(i->children.begin()) ); dx.push_back( eval_machine(i->children.begin()+1) ); return eval_machine(i->children.begin()) + "|->" + eval_machine(i->children.begin()+1); } else assert(0); } else { assert(0); // error } return 0; } //////////////////////////////////////////////////////////////////////////// int main() { // look in BMachineTreeGrammar for the definition of BMachine substitution BMach_subst; cout << "/////////////////////////////////////////////////////////\n\n"; cout << "\t\tB Machine Substitution...\n\n"; cout << "/////////////////////////////////////////////////////////\n\n"; cout << "Type an expression...or [q or Q] to quit\n\n"; string str; while (getline(cin, str)) { if (str.empty() || str[0] == 'q' || str[0] == 'Q') break; tree_parse_info<> info = ast_parse(str.c_str(), BMach_subst, space_p); if (info.full) { #if defined(BOOST_SPIRIT_DUMP_PARSETREE_AS_XML) // dump parse tree as XML std::map<parser_id, std::string> rule_names; rule_names[substitution::identifierID] = "identifier"; rule_names[substitution::leafValueID] = "leafValue"; rule_names[substitution::factorID] = "factor"; rule_names[substitution::termID] = "term"; rule_names[substitution::expressionID] = "expression"; rule_names[substitution::simple_substID] = "simple_subst"; tree_to_xml(cout, info.trees, str.c_str(), rule_names); #endif // print the result cout << "Variables in Vector dx: " << endl; for(vector<string>::iterator idx = dx.begin(); idx < dx.end(); ++idx) cout << *idx << endl; cout << "parsing succeeded\n"; cout << "result = " << evaluate(info) << "\n\n"; } else { cout << "parsing failed\n"; } } cout << "Bye... :-) \n\n"; return 0; } The grammar, defined in BMachineTreeGrammar.hpp file is given below: /*============================================================================= Copyright (c) 2010 Temitope Onunkun http://www.dcs.kcl.ac.uk/pg/onun Use, modification and distribution is subject to the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) =============================================================================*/ #ifndef BOOST_SPIRIT_BMachineTreeGrammar_HPP_ #define BOOST_SPIRIT_BMachineTreeGrammar_HPP_ using namespace boost::spirit; /////////////////////////////////////////////////////////////////////////////// // // Using Boost Spririt Trees (AST) to parse B Machine Substitutions. // /////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////// // // B Machine Grammar // //////////////////////////////////////////////////////////////////////////// struct substitution : public grammar<substitution> { static const int identifierID = 1; static const int leafValueID = 2; static const int factorID = 3; static const int termID = 4; static const int expressionID = 5; static const int simple_substID = 6; template <typename ScannerT> struct definition { definition(substitution const& ) { // Start grammar definition identifier = alpha_p >> (+alnum_p | ch_p('_') ) ; leafValue = leaf_node_d[ lexeme_d[ identifier | +digit_p ] ] ; factor = leafValue | inner_node_d[ ch_p( '(' ) >> expression >> ch_p(')' ) ] ; term = factor >> *( (root_node_d[ch_p('*') ] >> factor ) | (root_node_d[ch_p('/') ] >> factor ) ); expression = term >> *( (root_node_d[ch_p('+') ] >> term ) | (root_node_d[ch_p('-') ] >> term ) ); simple_subst= leaf_node_d[ lexeme_d[ identifier ] ] >> root_node_d[str_p(":=")] >> expression ; // End grammar definition // turn on the debugging info. BOOST_SPIRIT_DEBUG_RULE(identifier); BOOST_SPIRIT_DEBUG_RULE(leafValue); BOOST_SPIRIT_DEBUG_RULE(factor); BOOST_SPIRIT_DEBUG_RULE(term); BOOST_SPIRIT_DEBUG_RULE(expression); BOOST_SPIRIT_DEBUG_RULE(simple_subst); } rule<ScannerT, parser_context<>, parser_tag<simple_substID> > simple_subst; rule<ScannerT, parser_context<>, parser_tag<expressionID> > expression; rule<ScannerT, parser_context<>, parser_tag<termID> > term; rule<ScannerT, parser_context<>, parser_tag<factorID> > factor; rule<ScannerT, parser_context<>, parser_tag<leafValueID> > leafValue; rule<ScannerT, parser_context<>, parser_tag<identifierID> > identifier; rule<ScannerT, parser_context<>, parser_tag<simple_substID> > const& start() const { return simple_subst; } }; }; #endif The output I get on running the program is: ///////////////////////////////////////////////////////// B Machine Substitution... ///////////////////////////////////////////////////////// Type an expression...or [q or Q] to quit mySubst := var1 - var2 parsing succeeded In eval_machine. i->value = := i->children.size() = 2 Assertion failed: 0, file c:\redmound\bmachinetree\bmachinetree\bmachinetree.cpp , line 114 I will appreciate any help in resolving this problem.

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• Asp.net MVC 2, MvcContrib, and a base controller with redirect actions

  - by jeriley

  I've got a base controller that takes a couple generics, nothing overly fancy. public class SystemBaseController<TForm, TFormViewModel> : Controller where TForm : class, IForm where TFormViewModel : class, IViewModel ok, no big deal. I have a method "CompleteForm" that takes in the viewModel, looks kinda like this ... public ActionResult CompleteForm(TFormViewModel viewModel) { //does some stuff return this.RedirectToAction(c => c.FormInfo(viewModel)); } Problem is, the controller that inherits this, like so public class SalesFormController : SystemBaseController<SalesForm, SalesViewModel> { } I end up getting a error from MvcContrib - Controller name must end in 'Controller' at this point ... public RedirectToRouteResult(Expression<Action<T>> expression) : this(expression, expr => Microsoft.Web.Mvc.Internal.ExpressionHelper.GetRouteValuesFromExpression(expr)) {} The expression that's passed in is correct (SystemBaseController blahblah) but I'm not sure why its 1.) saying there's no controller at the end, and 2.) if I pull out everything into the controller (out of the base), works just fine. Do I need to write or setup some kind of action filter of my own or what am I missing?

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• Linq Query Performance , comparing Compiled query vs Non-Compiled.

  - by AG.

  Hello Guys, I was wondering if i extract the common where clause query into a common expression would it make my query much faster, if i have say something like 10 linq queries on a collection with exact same 1st part of the where clause. I have done a small example to explain a bit more . public class Person { public string First { get; set; } public string Last { get; set; } public int Age { get; set; } public String Born { get; set; } public string Living { get; set; } } public sealed class PersonDetails : List<Person> { } PersonDetails d = new PersonDetails(); d.Add(new Person() {Age = 29, Born = "Timbuk Tu", First = "Joe", Last = "Bloggs", Living = "London"}); d.Add(new Person() { Age = 29, Born = "Timbuk Tu", First = "Foo", Last = "Bar", Living = "NewYork" }); Expression<Func<Person, bool>> exp = (a) => a.Age == 29; Func<Person, bool> commonQuery = exp.Compile(); var lx = from y in d where commonQuery.Invoke(y) && y.Living == "London" select y; var bx = from y in d where y.Age == 29 && y.Living == "NewYork" select y; Console.WriteLine("All Details {0}, {1}, {2}, {3}, {4}", lx.Single().Age, lx.Single().First , lx.Single().Last, lx.Single().Living, lx.Single().Born ); Console.WriteLine("All Details {0}, {1}, {2}, {3}, {4}", bx.Single().Age, bx.Single().First, bx.Single().Last, bx.Single().Living, bx.Single().Born); So can some of the guru's here give me some advice if it would be a good practice to write query like var lx = "Linq Expression " or var bx = "Linq Expression" ? Any inputs would be highly appreciated. Thanks, AG

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• Linq PredicateBuilder with conditional AND, OR and NOT filters.

  - by richeym

  We have a project using LINQ to SQL, for which I need to rewrite a couple of search pages to allow the client to select whether they wish to perform an and or an or search. I though about redoing the LINQ queries using PredicateBuilder and have got this working pretty well I think. I effectively have a class containing my predicates, e.g.: internal static Expression<Func<Job, bool>> Description(string term) { return p => p.Description.Contains(term); } To perform the search i'm doing this (some code omitted for brevity): public Expression<Func<Job, bool>> ToLinqExpression() { var predicates = new List<Expression<Func<Job, bool>>>(); // build up predicates here if (SearchType == SearchType.And) { query = PredicateBuilder.True<Job>(); } else { query = PredicateBuilder.False<Job>(); } foreach (var predicate in predicates) { if (SearchType == SearchType.And) { query = query.And(predicate); } else { query = query.Or(predicate); } } return query; } While i'm reasonably happy with this, I have two concerns: The if/else blocks that evaluate a SearchType property feel like they could be a potential code smell. The client is now insisting on being able to perform 'and not' / 'or not' searches. To address point 2, I think I could do this by simply rewriting my expressions, e.g.: internal static Expression<Func<Job, bool>> Description(string term, bool invert) { if (invert) { return p => !p.Description.Contains(term); } else { return p => p.Description.Contains(term); } } However this feels like a bit of a kludge, which usually means there's a better solution out there. Can anyone recommend how this could be improved? I'm aware of dynamic LINQ, but I don't really want to lose LINQ's strong typing.

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• Problem building STLport NDK r5/ Android

  - by user558299

  Hi all, I'm trying to build STLport for Android. I got the following steps, but they are not working: 1 - Clone STLport repository using: git clone git://stlport.git.sourceforge.net/gitroot/stlport/stlport 2 - Configure environment using : ./configure --target=arm-eabi --with-extra-cxxflags="-fshort-enums" --with-extra-cflags="-fshort-enums" 3 - From src directory build it using make SYSROOT"{MY NDK path}/platforms/android-5/arch-arm/" release-static But I got the following errors: In file included from ../stlport/stl/_alloc.h:45, from ../stlport/memory:29, from dll_main.cpp:41: ../stlport/stl/_new.h:45:24: error: new: No such file or directory In file included from ../stlport/stl/_limits.h:36, from ../stlport/limits:29, from dll_main.cpp:48: ../stlport/stl/_cwchar.h:26:30: error: cstddef: No such file or directory In file included from ../stlport/stl/_utility.h:35, from ../stlport/utility:35, from dll_main.cpp:40: ../stlport/type_traits:889: error: 'declval' was not declared in this scope ../stlport/type_traits:889: error: expected primary-expression before '>' token ../stlport/type_traits:889: error: expected primary-expression before ')' token ../stlport/type_traits:889: error: 'declval' was not declared in this scope ../stlport/type_traits:889: error: expected primary-expression before '>' token ../stlport/type_traits:889: error: expected primary-expression before ')' token ../stlport/type_traits:889: error: ISO C++ forbids declaration of 'decltype' with no type ../stlport/type_traits:889: error: ISO C++ forbids in-class initialization of non-const static member 'decltype' ../stlport/type_traits:889: error: template declaration of 'int std::tr1::detail::decltype' ../stlport/type_traits:942: error: ISO C++ forbids declaration of 'decltype' with no type ../stlport/type_traits:942: error: ISO C++ forbids in-class initialization of non-const static member 'decltype' ../stlport/type_traits:942: error: template declaration of 'int std::tr1::detail::decltype' make: *** [obj/arm-eabi-gcc/so/dll_main.o] Error 1 Is there any include dir or configuration I´m missing? Thanks, Sergio

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• Regex problem in Java in code sample

  - by JaneNY

  I have job with regex in my expressions: example !(FA1_A.i & FA1_M.i) I have operators ! ( ) & | operands have names [a-zA-Z_]*.[a-zA-Z_] I wrote in Java to split on tokens, but it doesn't split on operators and operands If should be !, (, FA1_A.i, &, FA1_m.i, ) . Can anybody tell me what is wrong ? String stringOpеrator = "([!|&()])"; String stringOperand = "(([a-zA-Z_]*)\\.([a-zA-Z_]*))"; String reg=stringOpеrator+"|"+stringOperand; Pattern pattern = Pattern.compile(reg); Matcher m = pattern.matcher(expression); // System.out.println("func: " + function + " item: " + item); while (m.find()) { int a=m.start(); int b=m.end(); String test=expression.substring(m.start(), m.end()); String g=test; tokens.add(new Token(expression.substring(m.start() , m.end()))); //m = pattern.matcher(expression); }

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