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• How do I get results from a link query in the order of IDs that I provide?

  - by Keltex

  I'm looking to get query results back from Linq in the order that I pass IDs to the query. So it would look something like this: var IDs = new int [] { 5, 20, 10 } var items = from mytable in db.MyTable where IDs.Contains(mytable.mytableID) orderby // not sure what to do here select mytable; I'm hoping to get items in the order of IDs (5, 20, 10). (Note this is similar to this question, but I would like to do it in Linq instead of SQL)

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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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• Rewrite SQL Fulltext Function to return Table only

  - by Alex

  I have a MS SQL Fulltext Function like this: (...) RETURNS TABLE AS RETURN SELECT * FROM fishes INNER JOIN CONTAINSTABLE(fishes, *, @keywords, @limit) AS KEY_TBL ON fishes.id = KEY_TBL.[KEY] When I use this function in LINQ, it generates a special return type which includes all fields of my "fishes" table, plus Key and Rank. How could I rewrite above query, or change something in LINQ, to omit Key and Rank and just return my "fishes" results (and to have the fulltext search result objects be of type Fish, which is what I really care about, so I don't have to cast)?

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• left outer join problem

  - by ognjenb

  I need to convert some SQL statement to LINQ. How convert LEFT OUTER JOIN to equivalent LINQ statement?

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• How to get an object from a list based upon IEqualityComparer<T>

  - by Greg

  The Compare method in Linq lets you find by an IEqualityComparer, but I can't find a counterpart method that allows you retrieve an item by the same comparer. Is this really the best way to do it? MyItem myFinderItem = new MyItem(keyField1, keyField2); if (myList.Contains(myFinderItem, new MyEqualityComparer())) { MyItem myRealItem = myList.Single(item => new MyEqualityComparer().Equals(item , myFinderItem)); } (I'm sharing the usage of the IEqualityComaprer with a call to the Except Linq method and I'd like to maintain a single source for equality comparisons)

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• Is opening too many datacontexts bad?

  - by ryudice

  I've been checking my application with linq 2 sql profiler, and I noticed that it opens a lot of datacontexts, most of them are opened by the linq datasource I used, since my repositories use only the instance stored in Request.Items, is it bad to open too many datacontext? and how can I make my linqdatasource to use the datacontext that I store in Request.Items for the duration of the request? thanks for any help!

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• How to access data from multiple tables

  - by Vinay Pandey

  Hi All, How to write linq query to access data from multiple table.How do you write Linq query for the following sql query:- "select * from user,employee where user.Name='smith' and employee.company='xyz'"

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• Helping linqtosql datacontext use implicit conversion between varchar column in the database and tab

  - by user213256

  I am creating an mssql database table, "Orders", that will contain a varchar(50) field, "Value" containing a string that represents a slightly complex data type, "OrderValue". I am using a linqtosql datacontext class, which automatically types the "Value" column as a string. I gave the "OrderValue" class implicit conversion operators to and from a string, so I can easily use implicit conversion with the linqtosql classes like this: // get an order from the orders table MyDataContext db = new MyDataContext(); Order order = db.Orders(o => o.id == 1); // use implicit converstion to turn the string representation of the order // value into the complex data type. OrderValue value = order.Value; // adjust one of the fields in the complex data type value.Shipping += 10; // use implicit conversion to store the string representation of the complex // data type back in the linqtosql order object order.Value = value; // save changes db.SubmitChanges(); However, I would really like to be able to tell the linqtosql class to type this field as "OrderValue" rather than as "string". Then I would be able to avoid complex code and re-write the above as: // get an order from the orders table MyDataContext db = new MyDataContext(); Order order = db.Orders(o => o.id == 1); // The Value field is already typed as the "OrderValue" type rather than as string. // When a string value was read from the database table, it was implicity converted // to "OrderValue" type. order.Value.Shipping += 10; // save changes db.SubmitChanges(); In order to achieve this desired goal, I looked at the datacontext designer and selected the "Value" field of the "Order" table. Then, in properties, I changed "Type" to "global::MyApplication.OrderValue". The "Server Data Type" property was left as "VarChar(50) NOT NULL" The project built without errors. However, when reading from the database table, I was presented with the following error message: Could not convert from type 'System.String' to type 'MyApplication.OrderValue'. at System.Data.Linq.DBConvert.ChangeType(Object value, Type type) at Read_Order(ObjectMaterializer1 ) at System.Data.Linq.SqlClient.ObjectReaderCompiler.ObjectReader2.MoveNext() at System.Linq.Buffer1..ctor(IEnumerable1 source) at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source) at Example.OrdersProvider.GetOrders() at ... etc From the stack trace, I believe this error is happening while reading the data from the table. When presented with converting a string to my custom data type, even though the implicit conversion operators are present, the DBConvert class gets confused and throws an error. Is there anything I can do to help it not get confused and do the implicit conversion? Thanks in advance, and apologies if I have posted in the wrong forum. cheers / Ben

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• Filter to values in collection in one query

  - by dotnetdev

  Hi, I have the following LINQ query: List<string> Types = (List<string>) Directory.GetFiles(@"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727") Where(x => System.IO.Path.GetFileNameWithoutExtension(x).Contains("Microsoft")) .ToList<string>(); How could I modify this so it can only get the values stored in a collection, without writing another LINQ query (which I assume will impact performance?)? Thanks

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• Intersection() and Except() is too slow with large collections of custom objects

  - by Theo

  I am importing data from another database. My process is importing data from a remote DB into a List<DataModel> named remoteData and also importing data from the local DB into a List<DataModel> named localData. I am then using LINQ to create a list of records that are different so that I can update the local DB to match the data pulled from remote DB. Like this: var outdatedData = this.localData.Intersect(this.remoteData, new OutdatedDataComparer()).ToList(); I am then using LINQ to create a list of records that no longer exist in remoteData, but do exist in localData, so that I delete them from local database. Like this: var oldData = this.localData.Except(this.remoteData, new MatchingDataComparer()).ToList(); I am then using LINQ to do the opposite of the above to add the new data to the local database. Like this: var newData = this.remoteData.Except(this.localData, new MatchingDataComparer()).ToList(); Each collection imports about 70k records, and each of the 3 LINQ operation take between 5 - 10 minutes to complete. How can I make this faster? Here is the object the collections are using: internal class DataModel { public string Key1{ get; set; } public string Key2{ get; set; } public string Value1{ get; set; } public string Value2{ get; set; } public byte? Value3{ get; set; } } The comparer used to check for outdated records: class OutdatedDataComparer : IEqualityComparer<DataModel> { public bool Equals(DataModel x, DataModel y) { var e = string.Equals(x.Key1, y.Key1) && string.Equals(x.Key2, y.Key2) && ( !string.Equals(x.Value1, y.Value1) || !string.Equals(x.Value2, y.Value2) || x.Value3 != y.Value3 ); return e; } public int GetHashCode(DataModel obj) { return 0; } } The comparer used to find old and new records: internal class MatchingDataComparer : IEqualityComparer<DataModel> { public bool Equals(DataModel x, DataModel y) { return string.Equals(x.Key1, y.Key1) && string.Equals(x.Key2, y.Key2); } public int GetHashCode(DataModel obj) { return 0; } }

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• List<a> to List<b> converting when a and b have the same structur?

  - by Kovu

  Hi, I use C# 3.5 DotNet Framework and Linq. I have 2 Views which have the same result-schema, but in linq that are different objects of course. How can I convert List a to List b?

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• Decompiling a *.DLL to assembly for .net in delphi 4

  - by Lex Dean

  I love my Delphi 4 but at the same time I see the need to talk to windows .net This is a recompiled dll that I found on sourceforge.net/projects/delphinet/ (DelphiNet03.zip) by some nice people that fund the dll from some were. The real answer is to make this dll so that fits into Delphi as true Delphi code, and not a dll clip on. So we can make objects that use dot net in Delphi. Because I’m not an assembly freak, I’m freaking out a little with a wee sweek for help! 1/ How do I link the asm code with the data info at the bottom of this code. Can some one show me which calls to look for to make this link to data. 2/ I need to find the beginning of all the procedures and functions, but I cannot find a ‘RET’ statement. And what line is the beginning statement in this code. 3/ How do I identify were the jump statements go to, put them into Delphi format In this code it looks I can do:- jle 402890h \1000:00402854 7e3a add [eax], al \1000:00402856 0000 …………………………………………….. or ch, [edi+3eh] \1000:0040288d 0a6f3e xrefs first: 1000:00402854 number : 1 \; add [eax], al \1000:00402890 0000 //******************************* jle @@21 \\1000:00402854 7e3a add [eax], al \\1000:00402856 0000 …………………………………………….. or ch, [edi+3eh] \1000:0040288d 0a6f3e xrefs first: 1000:00402854 number : 1 \; @@21 add [eax], al \1000:00402890 0000 Is that a correct conversion. I think a xrefs first: 1000:004021d1 number : 1 is the best to follow 4/ I need a good reference on 8086 up assembly code that I can print out and get to learn properly. I found this asm decomplier of http://www.cronos.cc/ that is so similar to Delphi that it only needs a little more convertion to get it into Delphi asm I think. It’s only taken me 3 hours to get the file into TMemo and to write a few lines to chop the line over in a stream and reload the memo. Help please Email: [email protected] xrefs first: 1000:004041ae number : 1 \\; dd 4190h \\1000:00402000 90410000 dd 00h \\1000:00402004 00000000 dec eax \\1000:00402008 48 add [eax], al \\1000:00402009 0000 add [edx], al \\1000:0040200b 0002 add [eax], al \\1000:0040200d 0000 add [eax-2bffffd2h], al \\1000:0040200f 00802e0000d4 adc al, [eax] \\1000:00402015 1200 add [ecx], al \\1000:00402017 0001 add [eax], al \\1000:00402019 0000 add [eax], al \\1000:0040201b 0000 add [eax], al \\1000:0040201d 0000 add [eax], al \\1000:0040201f 0000 add [eax], al \\1000:00402021 0000 add [eax], al \\1000:00402023 0000 add [eax], al \\1000:00402025 0000 add [eax], al \\1000:00402027 0000 add [eax], al \\1000:00402029 0000 add [eax], al \\1000:0040202b 0000 add [eax], al \\1000:0040202d 0000 add [eax], al \\1000:0040202f 0000 add [eax], al \\1000:00402031 0000 add [eax], al \\1000:00402033 0000 add [eax], al \\1000:00402035 0000 add [eax], al \\1000:00402037 0000 add [eax], al \\1000:00402039 0000 add [eax], al \\1000:0040203b 0000 add [eax], al \\1000:0040203d 0000 add [eax], al \\1000:0040203f 0000 add [eax], al \\1000:00402041 0000 add [eax], al \\1000:00402043 0000 add [eax], al \\1000:00402045 0000 add [eax], al \\1000:00402047 0000 add [eax], al \\1000:00402049 0000 add [eax], al \\1000:0040204b 0000 add [eax], al \\1000:0040204d 0000 add [ebx], dl \\1000:0040204f 0013 xor [eax+eax], al \\1000:00402051 300400 or al, [ecx] \\1000:00402054 0a01 add [eax], al \\1000:00402056 0000 add [eax], eax \\1000:00402058 0100 add [ecx], dl \\1000:0040205a 0011 push cs \\1000:0040205c 0e add al, 50h \\1000:0040205d 0450 mov gs, [ecx+05h] \\1000:0040205f 8e6905 push eax \\1000:00402062 50 mov gs, [ecx+2eh] \\1000:00402063 8e692e add eax, f938h \\1000:00402066 0538f90000 add [ebx], al \\1000:0040206b 0003 jc 402070h \\1000:0040206d 7201 add [eax], al \\1000:0040206f 0000 jo 40209bh \\1000:00402071 7028 add al, [eax] \\1000:00402073 0200 add [edx], cl \\1000:00402075 000a sub eax, 36f0408h \\1000:00402077 2d08046f03 add [eax], al \\1000:0040207c 0000 or ch, [ebx] \\1000:0040207e 0a2b push es \\1000:00402080 06 add al, 6fh \\1000:00402081 046f add al, 00h \\1000:00402083 0400 add [edx], cl \\1000:00402085 000a adc eax, [edi] \\1000:00402087 1307 push ss \\1000:00402089 16 adc ecx, [eax] \\1000:0040208a 1308 cmp cl, cl \\1000:0040208c 38c9 add [eax], al \\1000:0040208e 0000 add [ecx], dl \\1000:00402090 0011 pop es \\1000:00402092 07 adc [eax], ecx \\1000:00402093 1108 callf 056f:060a9a08h \\1000:00402095 9a0a066f05 add [eax], al \\1000:0040209a 0000 or cl, [ebx] \\1000:0040209c 0a0b push es \\1000:0040209e 06 outsd \\1000:0040209f 6f push es \\1000:004020a0 06 add [eax], al \\1000:004020a1 0000 or al, [ebx] \\1000:004020a3 0a03 sub [edx], al \\1000:004020a5 2802 add [eax], al \\1000:004020a7 0000 or bh, [ecx] \\1000:004020a9 0a39 movsd \\1000:004020ab a5 add [eax], al \\1000:004020ac 0000 add [edi], al \\1000:004020ae 0007 mov gs, [ecx+0eh] \\1000:004020b0 8e690e add al, 50h \\1000:004020b3 0450 mov gs, [ecx+40h] \\1000:004020b5 8e6940 cwde \\1000:004020b8 98 add [eax], al \\1000:004020b9 0000 add [edi], dl \\1000:004020bb 0017 or al, 16h \\1000:004020bd 0c16 or eax, 9072b2bh \\1000:004020bf 0d2b2b0709 callf 0000:076f9a09h \\1000:004020c4 9a6f070000 or ch, [edi+08h] \\1000:004020c9 0a6f08 add [eax], al \\1000:004020cc 0000 or ch, [eax+ebx] \\1000:004020ce 0a2c18 push cs \\1000:004020d1 0e add al, 50h \\1000:004020d2 0450 or [edx+d72h], ebx \\1000:004020d4 099a720d0000 jo 402104h \\1000:004020da 7028 or [eax], eax \\1000:004020dc 0900 add [edx], cl \\1000:004020de 000a add dl, cs:[esi] \\1000:004020e0 2e0216 or al, 08h \\1000:004020e3 0c08 sub eax, 90c2b02h \\1000:004020e5 2d022b0c09 pop ss \\1000:004020ea 17 pop eax \\1000:004020eb 58 or eax, 50040e09h \\1000:004020ec 0d090e0450 mov gs, [ecx+32h] \\1000:004020f1 8e6932 int 08h \\1000:004020f4 cd08 sub al, 5ch \\1000:004020f6 2c5c push ss \\1000:004020f8 16 adc eax, [ebx+ebp] \\1000:004020f9 13042b dec esi \\1000:004020fc 4e push cs \\1000:004020fd 0e add al, 50h \\1000:004020fe 0450 adc [edx+ebx*4], eax \\1000:00402100 11049a jc 402112h \\1000:00402103 720d add [eax], al \\1000:00402105 0000 jo 402131h \\1000:00402107 7028 or [eax], eax \\1000:00402109 0900 add [edx], cl \\1000:0040210b 000a xor esi, [esi] \\1000:0040210d 3336 pop es \\1000:0040210f 07 adc [edx+ebx*4], eax \\1000:00402110 11049a outsd \\1000:00402113 6f pop es \\1000:00402114 07 add [eax], al \\1000:00402115 0000 or ch, [edi+0ah] \\1000:00402117 0a6f0a add [eax], al \\1000:0040211a 0000 or dl, [ebx] \\1000:0040211c 0a13 push es \\1000:0040211e 06 add eax, 9a041150h \\1000:0040211f 055011049a sub [ebx], cl \\1000:00402124 280b add [eax], al \\1000:00402126 0000 or dl, [edx] \\1000:00402128 0a12 push es \\1000:0040212a 06 adc al, [c28h] \\1000:0040212b 1205280c0000 xrefs first: 1000:00402107 number : 1 \\; or ch, [edx+eax] \\1000:00402131 0a2c02 sub ebx, [esi] \\1000:00402134 2b1e push cs \\1000:00402136 0e add al, 50h \\1000:00402137 0450 adc [edi+eax], eax \\1000:00402139 110407 adc [edx+ebx*4], eax \\1000:0040213c 11049a outsd \\1000:0040213f 6f pop es \\1000:00402140 07 add [eax], al \\1000:00402141 0000 or ah, [edx+58170411h] \\1000:00402143 0aa211041758 adc eax, [ecx+edx] \\1000:00402149 130411 add al, 0eh \\1000:0040214c 040e add al, 50h \\1000:0040214e 0450 mov gs, [ecx+32h] \\1000:00402150 8e6932 test eax, 58170811h \\1000:00402153 a911081758 adc ecx, [eax] \\1000:00402158 1308 adc [eax], ecx \\1000:0040215a 1108 adc [edi], eax \\1000:0040215c 1107 mov gs, [ecx+3fh] \\1000:0040215e 8e693f sub al, ffh \\1000:00402161 2cff db ff \\1000:00402163 ff jmp [edx] \\1000:00402164 ff2a add [eax], al \\1000:00402166 0000 adc esi, [eax] \\1000:00402168 1330 add eax, 8100h \\1000:0040216a 0500810000 add [edx], al \\1000:0040216f 0002 add [eax], al \\1000:00402171 0000 adc [edx+esi*2], eax \\1000:00402173 110472 xor eax, [eax] \\1000:00402176 3300 add [eax+28h], dh \\1000:00402178 007028 add al, [eax] \\1000:0040217b 0200 add [edx], cl \\1000:0040217d 000a sub al, 09h \\1000:0040217f 2c09 add ebp, [eax] \\1000:00402181 0328 or eax, a0a0000h \\1000:00402183 0d00000a0a sub eax, [edi] \\1000:00402188 2b07 add al, 28h \\1000:0040218a 0428 push cs \\1000:0040218c 0e add [eax], al \\1000:0040218d 0000 or cl, [edx] \\1000:0040218f 0a0a push es \\1000:00402191 06 add eax, f6f1717h \\1000:00402192 0517176f0f add [eax], al \\1000:00402197 0000 or cl, [ebx] \\1000:00402199 0a0b push ss \\1000:0040219b 16 lea eax, [edx] \\1000:0040219c 8d02 add [eax], al \\1000:0040219e 0000 add [esi+ecx], ecx \\1000:004021a0 010c0e add al, 2ch \\1000:004021a3 042c push cs \\1000:004021a5 260e add al, 8eh \\1000:004021a7 048e c160d imul edi, [eax+28dh], d160c01h \\1000:004021a9 69b88d020000010c sub edx, [eax] \\1000:004021b3 2b10 or [ecx], cl \\1000:004021b5 0809 push cs \\1000:004021b7 0e add al, 09h \\1000:004021b8 0409 callf 0000:106f9a09h \\1000:004021ba 9a6f100000 or ah, [edx+d581709h] \\1000:004021bf 0aa20917580d or [esi], ecx \\1000:004021c5 090e add al, 8eh \\1000:004021c7 048e imul esi, [edx], 17202e9h \\1000:004021c9 6932e9027201 add [eax], al \\1000:004021cf 0000 jo 4021dah \\1000:004021d1 7007 db 0f \\1000:004021d3 0f add al, 12h \\1000:004021d4 0412 add ch, [eax] \\1000:004021d6 0228 add [eax], eax \\1000:004021d8 0100 xrefs first: 1000:004021d1 number : 1 \\; add [esi], al \\1000:004021da 0006 pop es \\1000:004021dc 07 or [edi+11h], ch \\1000:004021dd 086f11 add [eax], al \\1000:004021e0 0000 or dl, [ebx] \\1000:004021e2 0a13 add al, 11h \\1000:004021e4 0411 add al, 0eh \\1000:004021e6 040e add al, 6fh \\1000:004021e8 046f adc al, [eax] \\1000:004021ea 1200 add [edx], cl \\1000:004021ec 000a adc eax, [511002bh] \\1000:004021ee 13052b001105 sub al, [eax] \\1000:004021f4 2a00 add [eax], al \\1000:004021f6 0000 adc esi, [eax] \\1000:004021f8 1330 add eax, 4e00h \\1000:004021fa 05004e0000 add [ebx], al \\1000:004021ff 0003 add [eax], al \\1000:00402201 0000 adc [ebx], eax \\1000:00402203 1103 outsd \\1000:00402205 6f adc [eax], al \\1000:00402206 1000 add [edx], cl \\1000:00402208 000a or al, [8db8698eh] \\1000:0040220a 0a058e69b88d add al, [eax] \\1000:00402210 0200 add [ecx], al \\1000:00402212 0001 or edx, [esi] \\1000:00402214 0b16 or al, 2bh \\1000:00402216 0c2b db 0f \\1000:00402218 0f pop es \\1000:00402219 07 or [106f9a08h], al \\1000:0040221a 0805089a6f10 add [eax], al \\1000:00402220 0000 or ah, [edx+c581708h] \\1000:00402222 0aa20817580c or [eb32698eh], al \\1000:00402228 08058e6932eb add al, [esi+eax] \\1000:0040222e 020406 lsl edx, [edx] \\1000:00402231 0f0312 add [eax], ebp \\1000:00402234 0128 add [eax], eax \\1000:00402236 0100 add [esi], al \\1000:00402238 0006 push es \\1000:0040223a 06 add al, 07h \\1000:0040223b 0407 outsd \\1000:0040223d 6f adc eax, [eax] \\1000:0040223e 1300 add [edx], cl \\1000:00402240 000a or eax, 6f050309h \\1000:00402242 0d0903056f adc al, 00h \\1000:00402247 1400 add [edx], cl \\1000:00402249 000a adc eax, [ebx+ebp] \\1000:0040224b 13042b add [ecx], dl \\1000:0040224e 0011 add al, 2ah \\1000:00402250 042a add [eax], al \\1000:00402252 0000 adc esi, [eax] \\1000:00402254 1330 add eax, 7600h \\1000:00402256 0500760000 add [eax+eax], al \\1000:0040225b 000400 add [ecx], dl \\1000:0040225e 0011 add al, 72h \\1000:00402260 0472 xor eax, [eax] \\1000:00402262 3300 add [eax+28h], dh \\1000:00402264 007028 add al, [eax] \\1000:00402267 0200 add [edx], cl \\1000:00402269 000a sub al, 09h \\1000:0040226b 2c09 add ebp, [eax] \\1000:0040226d 0328 or eax, a0a0000h \\1000:0040226f 0d00000a0a sub eax, [edi] \\1000:00402274 2b07 add al, 28h \\1000:00402276 0428 push cs \\1000:00402278 0e add [eax], al \\1000:00402279 0000 or cl, [edx] \\1000:0040227b 0a0a push es \\1000:0040227d 06 add eax, f6f1717h \\1000:0040227e 0517176f0f add [eax], al \\1000:00402283 0000 or cl, [ebx] \\1000:00402285 0a0b push cs \\1000:00402287 0e add eax, 8db8698eh \\1000:00402288 058e69b88d add al, [eax] \\1000:0040228d 0200 add [ecx], al \\1000:0040228f 0001 or al, 16h \\1000:00402291 0c16 or eax, 908102bh \\1000:00402293 0d2b100809 push cs \\1000:00402298 0e add eax, 106f9a09h \\1000:00402299 05099a6f10 add [eax], al \\1000:0040229e 0000 or ah, [edx+d581709h] \\1000:004022a0 0aa20917580d or [esi], ecx \\1000:004022a6 090e add eax, e932698eh \\1000:004022a8 058e6932e9 add cl, [esi] \\1000:004022ad 020e add al, 07h \\1000:004022af 0407 db 0f \\1000:004022b1 0f add eax, 1280212h \\1000:004022b2 0512022801 add [eax], al \\1000:004022b7 0000 push es \\1000:004022b9 06 pop es \\1000:004022ba 07 push cs \\1000:004022bb 0e add al, 08h \\1000:004022bc 0408 outsd \\1000:004022be 6f adc eax, [eax] \\1000:004022bf 1300 add [edx], cl \\1000:004022c1 000a adc eax, [ecx+edx] \\1000:004022c3 130411 add al, 14h \\1000:004022c6 0414 push cs \\1000:004022c8 0e add eax, 146fh \\1000:004022c9 056f140000 or dl, [ebx] \\1000:004022ce 0a13 add eax, 511002bh \\1000:004022d0 052b001105 sub al, [eax] \\1000:004022d5 2a00 add [ebx], dl \\1000:004022d7 0013 xor [eax+eax], al \\1000:004022d9 300400 jbe 4022deh \\1000:004022dc 7600 xrefs first: 1000:004022dc number : 1 \\; add fs:[esi+45h], cl \\1000:004034fc 64004e45 push esp \\1000:00403500 54 dec ecx \\1000:00403501 49 xrefs first: 1000:004034b2 number : 1 \\; outsb \\1000:00403502 6e jbe 403574h \\1000:00403503 766f imul esp, [ebp+43h], 6ch \\1000:00403505 6b65436c popad \\1000:00403509 61 jnc 40357fh \\1000:0040350a 7373 dec ebp \\1000:0040350c 4d jz 403578h \\1000:0040350d 657468 outsd \\1000:00403510 6f add fs:[esi+45h], cl \\1000:00403511 64004e45 push esp \\1000:00403515 54 push ebx \\1000:00403516 53 jz 40355fh \\1000:00403517 657445 outsb \\1000:0040351a 6e jnz 40358ah \\1000:0040351b 756d push esi \\1000:0040351d 56 xrefs first: 1000:004034b7 number : 1 \\; popad \\1000:0040351e 61 insb \\1000:0040351f 6c jnz 403587h \\1000:00403520 7565 add [esi+45h], cl \\1000:00403522 004e45 push esp \\1000:00403525 54 inc edi \\1000:00403526 47 db 65 ;'e' \\1000:00403527 65 xrefs first: 1000:004034be number : 1 \\; db 74 ;'t' \\1000:00403528 74 db 50 ;'p' \\1000:00403529 50 db 72 ;'r' \\1000:0040352a 72 db 6f ;'o' \\1000:0040352b 6f db 70 ;'p' \\1000:0040352c 70 db 65 ;'e' \\1000:0040352d 65 db 72 ;'r' \\1000:0040352e 72 db 74 ;'t' \\1000:0040352f 74 db 79 ;'y' \\1000:00403530 79 db 00 \\1000:00403531 00 db 4e ;'n' \\1000:00403532 4e db 45 ;'e' \\1000:00403533 45 db 54 ;'t' \\1000:00403534 54 db 47 ;'g' \\1000:00403535 47 db 65 ;'e' \\1000:00403536 65 db 74 ;'t' \\1000:00403537 74 db 46 ;'f' \\1000:00403538 46 db 69 ;'i' \\1000:00403539 69 db 65 ;'e' \\1000:0040353a 65 db 6c ;'l' \\1000:0040353b 6c db 64 ;'d' \\1000:0040353c 64 db 00 \\1000:0040353d 00 could not fit the rest in because of Stack overflow limitions

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• Overflow exception while performing parallel factorization using the .NET Task Parallel Library (TPL

  - by Aviad P.

  Hello, I'm trying to write a not so smart factorization program and trying to do it in parallel using TPL. However, after about 15 minutes of running on a core 2 duo machine, I am getting an aggregate exception with an overflow exception inside it. All the entries in the stack trace are part of the .NET framework, the overflow does not come from my code. Any help would be appreciated in figuring out why this happens. Here's the commented code, hopefully it's simple enough to understand: class Program { static List<Tuple<BigInteger, int>> factors = new List<Tuple<BigInteger, int>>(); static void Main(string[] args) { BigInteger theNumber = BigInteger.Parse( "653872562986528347561038675107510176501827650178351386656875178" + "568165317809518359617865178659815012571026531984659218451608845" + "719856107834513527"); Stopwatch sw = new Stopwatch(); bool isComposite = false; sw.Start(); do { /* Print out the number we are currently working on. */ Console.WriteLine(theNumber); /* Find a factor, stop when at least one is found (using the Any operator). */ isComposite = Range(theNumber) .AsParallel() .Any(x => CheckAndStoreFactor(theNumber, x)); /* Of the factors found, take the one with the lowest base. */ var factor = factors.OrderBy(x => x.Item1).First(); Console.WriteLine(factor); /* Divide the number by the factor. */ theNumber = BigInteger.Divide( theNumber, BigInteger.Pow(factor.Item1, factor.Item2)); /* Clear the discovered factors cache, and keep looking. */ factors.Clear(); } while (isComposite); sw.Stop(); Console.WriteLine(isComposite + " " + sw.Elapsed); } static IEnumerable<BigInteger> Range(BigInteger squareOfTarget) { BigInteger two = BigInteger.Parse("2"); BigInteger element = BigInteger.Parse("3"); while (element * element < squareOfTarget) { yield return element; element = BigInteger.Add(element, two); } } static bool CheckAndStoreFactor(BigInteger candidate, BigInteger factor) { BigInteger remainder, dividend = candidate; int exponent = 0; do { dividend = BigInteger.DivRem(dividend, factor, out remainder); if (remainder.IsZero) { exponent++; } } while (remainder.IsZero); if (exponent > 0) { lock (factors) { factors.Add(Tuple.Create(factor, exponent)); } } return exponent > 0; } } Here's the exception thrown: Unhandled Exception: System.AggregateException: One or more errors occurred. --- > System.OverflowException: Arithmetic operation resulted in an overflow. at System.Linq.Parallel.PartitionedDataSource`1.ContiguousChunkLazyEnumerator.MoveNext(T& currentElement, Int32& currentKey) at System.Linq.Parallel.AnyAllSearchOperator`1.AnyAllSearchOperatorEnumerator`1.MoveNext(Boolean& currentElement, Int32& currentKey) at System.Linq.Parallel.StopAndGoSpoolingTask`2.SpoolingWork() at System.Linq.Parallel.SpoolingTaskBase.Work() at System.Linq.Parallel.QueryTask.BaseWork(Object unused) at System.Linq.Parallel.QueryTask.<.cctor>b__0(Object o) at System.Threading.Tasks.Task.InnerInvoke() at System.Threading.Tasks.Task.Execute() --- End of inner exception stack trace --- at System.Linq.Parallel.QueryTaskGroupState.QueryEnd(Boolean userInitiatedDispose) at System.Linq.Parallel.SpoolingTask.SpoolStopAndGo[TInputOutput,TIgnoreKey](QueryTaskGroupState groupState, PartitionedStream`2 partitions, SynchronousChannel`1[] channels, TaskScheduler taskScheduler) at System.Linq.Parallel.DefaultMergeHelper`2.System.Linq.Parallel.IMergeHelper<TInputOutput>.Execute() at System.Linq.Parallel.MergeExecutor`1.Execute[TKey](PartitionedStream`2 partitions, Boolean ignoreOutput, ParallelMergeOptions options, TaskScheduler taskScheduler, Boolean isOrdered, CancellationState cancellationState, Int32 queryId) at System.Linq.Parallel.PartitionedStreamMerger`1.Receive[TKey](PartitionedStream`2 partitionedStream) at System.Linq.Parallel.AnyAllSearchOperator`1.WrapPartitionedStream[TKey](PartitionedStream`2 inputStream, IPartitionedStreamRecipient`1 recipient, BooleanpreferStriping, QuerySettings settings) at System.Linq.Parallel.UnaryQueryOperator`2.UnaryQueryOperatorResults.ChildResultsRecipient.Receive[TKey](PartitionedStream`2 inputStream) at System.Linq.Parallel.ScanQueryOperator`1.ScanEnumerableQueryOperatorResults.GivePartitionedStream(IPartitionedStreamRecipient`1 recipient) at System.Linq.Parallel.UnaryQueryOperator`2.UnaryQueryOperatorResults.GivePartitionedStream(IPartitionedStreamRecipient`1 recipient) at System.Linq.Parallel.QueryOperator`1.GetOpenedEnumerator(Nullable`1 mergeOptions, Boolean suppressOrder, Boolean forEffect, QuerySettings querySettings) at System.Linq.Parallel.QueryOpeningEnumerator`1.OpenQuery() at System.Linq.Parallel.QueryOpeningEnumerator`1.MoveNext() at System.Linq.Parallel.AnyAllSearchOperator`1.Aggregate() at System.Linq.ParallelEnumerable.Any[TSource](ParallelQuery`1 source, Func`2 predicate) at PFact.Program.Main(String[] args) in d:\myprojects\PFact\PFact\Program.cs:line 34 Any help would be appreciated. Thanks!

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• Why does calling IEnumerable<string>.Count() create an additional assembly dependency ?

  - by Gishu

  Assume this chain of dll references Tests.dll >> Automation.dll >> White.Core.dll with the following line of code in Tests.dll, where everything builds result.MissingPaths Now when I change this to result.MissingPaths.Count() I get the following build error for Tests.dll "White.UIItem is not defined in an assembly that is not referenced. You must add a reference to White.Core.dll." And I don't want to do that because it breaks my layering. Here is the type definition for result, which is in Automation.dll public class HasResult { public HasResult(IEnumerable<string> missingPaths ) { MissingPaths = missingPaths; } public IEnumerable<string> MissingPaths { get; set; } public bool AllExist { get { return !MissingPaths.Any(); } } } Down the call chain the input param to this ctor is created via (The TreeNode class is in White.Core.dll) assetPaths.Where(assetPath => !FindTreeNodeUsingCache(treeHandle, assetPath)); Why does this dependency leak when calling Count() on IEnumerable ? I then suspected that lazy evaluation was causing this (for some reason) - so I slotted in an ToArray() in the above line but didn't work. Update 2011 01 07: Curiouser and Curiouser! it won't build until I add a White.Core reference. So I add a reference and build it (in order to find the elusive dependency source). Open it up in Reflector and the only references listed are Automation, mscorlib, System.core and NUnit. So the compiler threw away the White reference as it was not needed. ILDASM also confirms that there is no White AssemblyRef entry. Any ideas on how to get to the bottom of this thing (primarily for 'now I wanna know why' reasons)? What are the chances that this is an VS2010/MSBuild bug? Update 2011 01 07 #2 As per Shimmy's suggestion, tried calling the method explcitly as an extension method Enumerable.Count(result.MissingPaths) and it stops cribbing (not sure why). However I moved some code around after that and now I'm getting the same issue at a different location using IEnumerable - this time reading and filtering lines out of a file on disk (totally unrelated to White). Seems like it's a 'symptom-fix'. var lines = File.ReadLines(aFilePath).ToArray(); once again, if I remove the ToArray() it compiles again - it seems that any method that causes the enumerable to be evaluated (ToArray, Count, ToList, etc.) causes this. Let me try and get a working tiny-app to demo this issue... Update 2011 01 07 #3 Phew! More information.. It turns out the problem is just in one source file - this file is LINQ-phobic. Any call to an Enumerable extension method has to be explicitly called out. The refactorings that I did caused a new method to be moved into this source file, which had some LINQ :) Still no clue as to why this class dislikes LINQ. using System; using System.Collections.Generic; using System.IO; using System.Linq; using G.S.OurAutomation.Constants; using G.S.OurAutomation.Framework; using NUnit.Framework; namespace G.S.AcceptanceTests { public abstract class ConfigureThingBase : OurTestFixture { .... private static IEnumerable<string> GetExpectedThingsFor(string param) { // even this won't compile - although it compiles fine in an adjoining source file in the same assembly //IEnumerable<string> s = new string[0]; //Console.WriteLine(s.Count()); // this is the line that is now causing a build failure // var expectedInfo = File.ReadLines(someCsvFilePath)) // .Where(line => !line.StartsWith("REM", StringComparison.InvariantCultureIgnoreCase)) // .Select(line => line.Replace("%PLACEHOLDER%", param)) // .ToArray(); // Unrolling the LINQ above removes the build error var expectedInfo = Enumerable.ToArray( Enumerable.Select( Enumerable.Where( File.ReadLines(someCsvFilePath)), line => !line.StartsWith("REM", StringComparison.InvariantCultureIgnoreCase)), line => line.Replace("%PLACEHOLDER%", param)));

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• mercurial .hgrc notify hook

  - by Eeyore

  Could someone tell me what is incorrect in my .hgrc configuration? I am trying to use gmail to send a e-mail after each push and/or commit. .hgrc [paths] default = ssh://www.domain.com/repo/hg [ui] username = intern <[email protected]> ssh="C:\Program Files (x86)\Mercurial\plink.exe" -ssh -i "C:\Program Files (x86)\Mercurial\key.pub" [extensions] hgext.notify = [hooks] changegroup.notify = python:hgext.notify.hook incoming.notify = python:hgext.notify.hook [email] from = [email protected] [smtp] host = smtp.gmail.com username = [email protected] password = sure port = 587 tls = true [web] baseurl = http://dev/... [notify] sources = serve push pull bundle test = False config = /path/to/subscription/file template = \ndetails: {baseurl}{webroot}/rev/{node|short}\nchangeset: {rev}:{node|short}\nuser: {author}\ndate: {date|date}\ndescription:\n{desc}\n maxdiff = 300 Error Incoming comand failed for P/project. running ""C:\Program Files (x86)\Mercurial\plink.exe" -ssh -i "C:\Program Files (x86)\Mercurial\key.pub" [email protected] "hg -R repo/hg serve --stdio"" sending hello command sending between command remote: FATAL ERROR: Server unexpectedly closed network connection abort: no suitable response from remote hg! , error code: -1 running ""C:\Program Files (x86)\Mercurial\plink.exe" -ssh -i "C:\Program Files (x86)\Mercurial\key.pub" [email protected] "hg -R repo/hg serve --stdio"" sending hello command sending between command remote: FATAL ERROR: Server unexpectedly closed network connection abort: no suitable response from remote hg!

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• Determine whether app is communicating with APNS sandbox or production environment

  - by goldierox

  I have push notifications set up in my app. I'm trying to determine whether the device token I've received from APNS in the application:didRegisterForRemoteNotificationsWithDeviceToken: method came from the sandbox or development environment. If I can distinguish which environment initialized the token, I'll be able to tell my server to which environment to send the push notification. I've tried using the DEBUG macro to determine this, but I've seen some strange behavior with this and don't trust it to be 100% correct. #ifdef DEBUG BOOL isProd = YES; #else BOOL isProd = NO; #endif Ideally, I'd be able to examine the aps-environment entitlement (value is Development or Production) in code, but I'm not sure if this is even possible. What's the proper way to determine whether your app is communicating with the APNS sandbox or production environments? I'm assuming that the server needs to know this in the first place. Please correct me if this is assumption is incorrect. Edited: Apple's documentation on Provider Communication with APNS details the difference between communicating with the sandbox and production. However, the documentation doesn't give information on how to be consistent with registering the token (from the iOS client app) and communicating with the server.

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• How to change the default branch to push in mercurial?

  - by timmfin

  I like creating named branches in Mercurial to deal with features that might take a while to code, so when I push I do a hg push -r default to insure I'm only pushing changes to the default branch. However, it is a pain to have to remember -r default every since time I do do a push or outgoing command. So I tried fix this by adding this config to my ~/.hgrc: [defaults] push = push -r default outgoing = outgoing -r default The problem is, those config lines are not really defaults, they are aliases. They work as intended until I try to do a hg push -r <some revision>. And the "default" I've setup just obliterates the revision I passed in. (I see that defaults are deprecated, but aliases have the same problem). I tried looking around, but I can't find anything that will allow me to set a default branch to push AND allow me to override it when necessary. Anyone know of something else I could do? ps: I do realize that I could have separate clones for each branch, but I would rather not do that. It's annoying to have to switch directories, particularly when you have shared configuration or editor workspaces.

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• How do I push code to github on shutdown?

  - by Ezequiel

  I switch between working at home and the office, and sometimes, like today, I forget to run a git commit/push. (I find it easy to ignore the command line since I'm still kind of a beginner, there.) How can I make it so that when I shut down my Ubuntu OS, it will follow this process: Check my local code against the github server, executing the rest of this script only if I've made newer changes. Add all new files. Make commits with a basic default comment. Push all changed code to origin master. If anyone knows how to do this, it would be a major assist. Also, anyone know how to do it for Mac OSX? :D

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• RIM facilite la mise à jour des applications BlackBerry avec Push, un nouvel outil pour les développ

  RIM facilite la mise à jour des applications BlackBerry avec Push, un nouvel outil pour les développeurs La bataille fait rage entre les différents constructeurs de smartphones, à celui qui proposera le plus d'applications, et bien sûr les meilleures. Dans ce marché tendu, BlackBerry sait que pour conserver ses utilisateurs, il doit leur apporter un catalogue de petits programmes sans cesse renouvelés, utiles et divertissants. Research In Motion (la firme propriétaire de la marque BlackBerry) a donc fait un mouvement en ce sens en dévoilant son Push Service. A l'attention des développeurs utilisant l'OS BlackBerry, cette offre apporte des mises à jour qui sont directement implémentées au logiciel sans l'interrompre...

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• Is there a way to determine if a database has been altered, then to push new data to the Application

  - by TeamGB

  All our (my company) currently applications pull information from that database, is their a way to get the following types of databses to either push data or push an event to allow the application to pull data. Access SQL Oracle File systems (Files and folders) The issue today is that most of our application spend a large amount of time constantly looking at databases and file system checking to see if data has changed . It would be better for the database to inform the application when data has changed. Are there tools within Visual studio to allow this or are there tools within the database / filesystem to do this? All ready asked this on stack overflow but go no answer. I've been doing some more research but I cant seem to get any further. My manager has asked to investigate it as it would mean our applications are much quicker and efficient.

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• What is the difference from the push and pull development models?

  - by michelpm

  I was reading Extreme Programming Explained, Second Edition and in the chapter 11 "The Theory of Constraints" the authors talk about the old and obsolete "push" development model and the XP way, the "pull" development model. It looks like a quite important concept, but it takes only a very small paragraph and two images that are mere illustrations of the "waterfall" and iterative process, nothing specific about these models except by the image caption. I searched and it doesn't go any further about it in the rest of the book. I couldn't find any further explanations or discussions about it in the Internet either. If the only difference about those is that one is "waterfall" and the other is iterative, them why push and why pull? Does anyone understand what is really the difference between those two and give some good examples?

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• How can I create a generaic ValidationAttribute in C#?

  - by sabbour

  I'm trying to create a UniqueAttribute using the System.ComponentModel.DataAnnotations.ValidationAttribute I want this to be generic as in I could pass the Linq DataContext, the table name, the field and validate if the incoming value is unique or not. Here is a non-compilable code fragment that I'm stuck at right now: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.ComponentModel.DataAnnotations; using System.Data.Linq; using System.ComponentModel; namespace LinkDev.Innovation.Miscellaneous.Validation.Attributes { public class UniqueAttribute : ValidationAttribute { public string Field { get; set; } public override bool IsValid(object value) { string str = (string)value; if (String.IsNullOrEmpty(str)) return true; // this is where I'm stuck return (!Table.Where(entity => entity.Field.Equals(str)).Any()); } } } I should be using this in my model as follows: [Required] [StringLength(10)] [Unique(new DataContext(),"Groups","name")] public string name { get; set; }

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• Subsonic 3.0.0.4 Does not Update

  - by geocine

  I tried 3 variants but doesn't seem to update (I am using Linq Templates and MSSQL) Luna.Data.GameDBDB db = new Luna.Data.GameDBDB(); db.Update<Luna.Record.TB_ITEM>() .Set(x => x.ITEM_DURABILITY == Convert.ToInt32(quantity)) .Where(x => x.ITEM_DBIDX == Convert.ToInt32(dbdidx)) .Execute(); Here is the other one var db = new Luna.Data.GameDBDB(); var query = (from p in db.TB_ITEMS where p.ITEM_DBIDX == Convert.ToInt32(dbidx) select p).Single(); query.ITEM_DURABILITY = Convert.ToInt32(quantity); db.tp TP_ITEM_UPDATE(); and the other one var db = new Luna.Data.GameDBDB(); var query = (from p in db.TB_ITEMS where p.ITEM_DBIDX == Convert.ToInt32(dbidx) select p).Single(); query.ITEM_DURABILITY = Convert.ToInt32(quantity); db.Update<Luna.Data.TB_ITEM>(); However it worked using LINQ-to-SQL LunaDataContext db = new LunaDataContext(); var query = (from p in db.TB_ITEMs where p.ITEM_DBIDX == Convert.ToInt32(dbidx) select p).Single(); query.ITEM_DURABILITY = Convert.ToInt32(quantity); db.SubmitChanges(); Is this a bug in 3.0.0.4, the database record couldn't be updated using Linq Templates and ActiveRecord.

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• An unhandled exception of type 'System.StackOverflowException' occurred in mscorlib.dll

  - by mazhar

  Ok the thing is that I am using asp.net mvc with linq to sql. I have a scenario where there are two tables group and features with many to many relationship with the third table groupfeatures. I have drag and drop all three table in the dbml file. The thing is that it runs fine with group but when I call the Feature things the above error occured and the compilers stops at this line in ((())). public partial class EgovtDataContext : System.Data.Linq.DataContext { private static System.Data.Linq.Mapping.MappingSource mappingSource = new AttributeMappingSource(); #region Extensibility Method Definitions partial void OnCreated(); partial void InsertGroup(Group instance); partial void UpdateGroup(Group instance); partial void DeleteGroup(Group instance); partial void InsertFeature(Feature instance); partial void UpdateFeature(Feature instance); partial void DeleteFeature(Feature instance); partial void InsertGroupFeature(GroupFeature instance); partial void UpdateGroupFeature(GroupFeature instance); partial void DeleteGroupFeature(GroupFeature instance); #endregion (((public EgovtDataContext() : base(global::System.Configuration.ConfigurationManager.ConnectionStrings["egovtsConnectionString"].ConnectionString, mappingSource)))) The code in both the controller Group and features file is ditto copied. Note the group things are working, the features things are not. FeaturesRepository.cs public IQueryable<Feature> FindAllFeatures() { return db.Features; } FeaturesController.cs FeaturesRepository FeatureRepository = new FeaturesRepository(); public ActionResult Index() { var Feature = FeatureRepository.FindAllFeatures(); return View(Feature); } So what could be wrong?

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• Specifying ASP.NET MVC attributes for auto-generated data models

  - by Lyubomyr Shaydariv

  Hello to everyone. I'm very new to ASP.NET MVC (as well as ASP.NET in general), and going to gain some knowledge for this technology, so I'm sorry I can ask some trivial questions. I have installed ASP.NET MVC 3 RC1 and I'm trying to do the following. Let's consider that I have a model that's completely auto-generated from a table using the "LINQ to SQL Classes" template in VS2010. The template generates 3 files (two .cs files and one .layout file respectively), and the generated partial class is expected to be used as an MVC model. Let's also consider, a single DB column, that's mapped into the model, may look like this: [global::System.Data.Linq.Mapping.ColumnAttribute(Storage = "_Name", DbType = "VarChar(128)")] public string Name { get { return this._Name; } set { if ( (this._Name != value) ) { // ... generated stuff goes here } } } The ASP.NET MVC engine also provides a beautiful declarative way to specify some additional stuff, like RequiredAttribute, DisplayNameAttribute and other nice attributes. But since the mapped model is a purely auto-genereated model, I've realized that I should not change the model manually, and specify the fields like: [Required] [DisplayName("Project name")] [StringLength(128)] [global::System.Data.Linq.Mapping.ColumnAttribute(Storage = "_Name", DbType = "VarChar(128)")] public string Name { ... though this approach works perfectly... until I change the model in the DBML-designer removing the ASP.NET MVC attributes automatically. So, how do I specify ASP.NET MVC attributes for the DBML models and their fields safely? Thanks in advance, and Merry Christmas.

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