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• How to compare nullable types?

  - by David_001

  I have a few places where I need to compare 2 (nullable) values, to see if they're the same. I think there should be something in the framework to support this, but can't find anything, so instead have the following: public static bool IsDifferentTo(this bool? x, bool? y) { return (x.HasValue != y.HasValue) ? true : x.HasValue && x.Value != y.Value; } Then, within code I have if (x.IsDifferentTo(y)) ... I then have similar methods for nullable ints, nullable doubles etc. Is there not an easier way to see if two nullable types are the same? Update: Turns out that the reason this method existed was because the code has been converted from VB.Net, where Nothing = Nothing returns false (compare to C# where null == null returns true). The VB.Net code should have used .Equals... instead.

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• ASPxGridView Pager disappears

  - by Jo Asakura

  Hello all, I use the ASPxGridView with paging, pager settings is next: <SettingsPager Mode="ShowPager" Position="Bottom" Visible="true"> Also I have a CustomButtonInitialize event: protected void gridViewInvoices_CustomButtonInitialize(object sender, ASPxGridViewCustomButtonEventArgs e) { if (!e.IsEditingRow) { Invoice invoice = (Invoice)gridViewInvoices.GetRow(e.VisibleIndex); if (invoice != null) { if (e.ButtonID == "btnConfirmPayment") { e.Visible = invoice.PaymentConfirmedDate.HasValue ? DefaultBoolean.False : DefaultBoolean.Default; } } } } When I open the page with this grid the pager disappears but if I comment my CustomButtonInitialize event: protected void gridViewInvoices_CustomButtonInitialize(object sender, ASPxGridViewCustomButtonEventArgs e) { /*if (!e.IsEditingRow) { Invoice invoice = (Invoice)gridViewInvoices.GetRow(e.VisibleIndex); if (invoice != null) { if (e.ButtonID == "btnConfirmPayment") { e.Visible = invoice.PaymentConfirmedDate.HasValue ? DefaultBoolean.False : DefaultBoolean.Default; } } }*/ } Pager appears again, how can I fix it and how is pager depend on this event (CustomButtonInitialize)? Best regards, Alex.

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• Application Specific Paths for DLL Loading when DLL is loaded dynamically

  - by MartinHT

  Hi: I am building a program that uses a very simple plugin system. This is the code I'm using to load the possible plugins: public interface IPlugin { string Name { get; } string Description { get; } bool Execute(System.Windows.Forms.IWin32Window parent); } private void loadPlugins() { int idx = 0; string[] pluginFolders = getPluginFolders(); Array.ForEach(pluginFolders, folder => { string[] pluginFiles = getPluginFiles(folder); Array.ForEach(pluginFiles, file => { try { System.Reflection.Assembly assembly = System.Reflection.Assembly.LoadFile(file); Array.ForEach(assembly.GetTypes(), type => { if(type.GetInterface("PluginExecutor.IPlugin") != null) { IPlugin plugin = assembly.CreateInstance(type.ToString()) as IPlugin; if(plugin != null) lista.Add(new PluginItem(plugin.Name, plugin.Description, file, plugin)); } }); } catch(Exception) { } }); }); } When the user selects a particular plugin from the list, I launch the plugin's Execute method. So far, so good! As you can see the plugins are loaded from a folder, and within the folder are several dll's that are needed but the plugin. My problem is that I can't get the plugin to 'see' the dlls, it just searches the launching applications startup folder, but not the folder where the plugin was loaded from. I have tried several methods: 1. Changing the Current Directory to the plugins folder. 2. Using an inter-op call to SetDllDirectory 3. Adding an entry in the registry to point to a folder where I want it to look (see code below) None of these methods work. What am I missing? As I load the dll plugin dynamically, it does not seem to obey any of the above mentioned methods. What else can I try? Regards, MartinH. //HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths Microsoft.Win32.RegistryKey appPaths = Microsoft.Win32.Registry.LocalMachine.CreateSubKey( string.Format( @"SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\{0}", System.IO.Path.GetFileName(Application.ExecutablePath)), Microsoft.Win32.RegistryKeyPermissionCheck.ReadWriteSubTree); appPaths.SetValue(string.Empty, Application.ExecutablePath); object path = appPaths.GetValue("Path"); if(path == null) appPaths.SetValue("Path", System.IO.Path.GetDirectoryName(pluginItem.FileName)); else { string strPath = string.Format("{0};{1}", path, System.IO.Path.GetDirectoryName(pluginItem.FileName)); appPaths.SetValue("Path", strPath); } appPaths.Flush();

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• Inner synchronization on the same object as the outer synchronization

  - by Yaneeve

  Recently I attended a lecture concerning some design patterns: The following code had been displayed: public static Singleton getInstance() { if (instance == null) { synchronized(Singleton.class) { //1 Singleton inst = instance; //2 if (inst == null) { synchronized(Singleton.class) { //3 inst = new Singleton(); //4 } instance = inst; //5 } } } return instance; } taken from: Double-checked locking: Take two My question has nothing to do with the above mentioned pattern but with the synchronized block: Is there any benefit whatsoever to the double synchronization done in lines 1 & 3 with regards to the fact that the synchronize operation is done on the same Object?

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• ASP.NET GridView second header row to span main header row

  - by Dana Robinson

  I have an ASP.NET GridView which has columns that look like this: | Foo | Bar | Total1 | Total2 | Total3 | Is it possible to create a header on two rows that looks like this? | | Totals | | Foo | Bar | 1 | 2 | 3 | The data in each row will remain unchanged as this is just to pretty up the header and decrease the horizontal space that the grid takes up. The entire GridView is sortable in case that matters. I don't intend for the added "Totals" spanning column to have any sort functionality. Edit: Based on one of the articles given below, I created a class which inherits from GridView and adds the second header row in. namespace CustomControls { public class TwoHeadedGridView : GridView { protected Table InnerTable { get { if (this.HasControls()) { return (Table)this.Controls[0]; } return null; } } protected override void OnDataBound(EventArgs e) { base.OnDataBound(e); this.CreateSecondHeader(); } private void CreateSecondHeader() { GridViewRow row = new GridViewRow(0, -1, DataControlRowType.Header, DataControlRowState.Normal); TableCell left = new TableHeaderCell(); left.ColumnSpan = 3; row.Cells.Add(left); TableCell totals = new TableHeaderCell(); totals.ColumnSpan = this.Columns.Count - 3; totals.Text = "Totals"; row.Cells.Add(totals); this.InnerTable.Rows.AddAt(0, row); } } } In case you are new to ASP.NET like I am, I should also point out that you need to: 1) Register your class by adding a line like this to your web form: <%@ Register TagPrefix="foo" NameSpace="CustomControls" Assembly="__code"%> 2) Change asp:GridView in your previous markup to foo:TwoHeadedGridView. Don't forget the closing tag. Another edit: You can also do this without creating a custom class. Simply add an event handler for the DataBound event of your grid like this: protected void gvOrganisms_DataBound(object sender, EventArgs e) { GridView grid = sender as GridView; if (grid != null) { GridViewRow row = new GridViewRow(0, -1, DataControlRowType.Header, DataControlRowState.Normal); TableCell left = new TableHeaderCell(); left.ColumnSpan = 3; row.Cells.Add(left); TableCell totals = new TableHeaderCell(); totals.ColumnSpan = grid.Columns.Count - 3; totals.Text = "Totals"; row.Cells.Add(totals); Table t = grid.Controls[0] as Table; if (t != null) { t.Rows.AddAt(0, row); } } } The advantage of the custom control is that you can see the extra header row on the design view of your web form. The event handler method is a bit simpler, though.

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• SQL Server and Hyper-V Dynamic Memory - Part 1

  - by SQLOS Team

  SQL and Dynamic Memory Blog Post Series   Hyper-V Dynamic Memory is a new feature in Windows Server 2008 R2 SP1 that allows the memory assigned to guest virtual machines to vary according to demand. Using this feature with SQL Server is supported, but how well does it work in an environment where available memory can vary dynamically, especially since SQL Server likes memory, and is not very eager to let go of it? The next three posts will look at this question in detail. In Part 1 Serdar Sutay, a program manager in the Windows Hyper-V team, introduces Dynamic Memory with an overview of the basic architecture, configuration and monitoring concepts. In subsequent parts we will look at SQL Server memory handling, and develop some guidelines on using SQL Server with Dynamic Memory.   Part 1: Dynamic Memory Introduction   In virtualized environments memory is often the bottleneck for reaching higher VM densities. In Windows Server 2008 R2 SP1 Hyper-V introduced a new feature “Dynamic Memory” to improve VM densities on Hyper-V hosts. Dynamic Memory increases the memory utilization in virtualized environments by enabling VM memory to be changed dynamically when the VM is running.   This brings up the question of how to utilize this feature with SQL Server VMs as SQL Server performance is very sensitive to the memory being used. In the next three posts we’ll discuss the internals of Dynamic Memory, SQL Server Memory Management and how to use Dynamic Memory with SQL Server VMs.   Memory Utilization Efficiency in Virtualized Environments   The primary reason memory is usually the bottleneck for higher VM densities is that users tend to be generous when assigning memory to their VMs. Here are some memory sizing practices we’ve heard from customers:   ·         I assign 4 GB of memory to my VMs. I don’t know if all of it is being used by the applications but no one complains. ·         I take the minimum system requirements and add 50% more. ·         I go with the recommendations provided by my software vendor.   In reality correctly sizing a virtual machine requires significant effort to monitor the memory usage of the applications. Since this is not done in most environments, VMs are usually over-provisioned in terms of memory. In other words, a SQL Server VM that is assigned 4 GB of memory may not need to use 4 GB.   How does Dynamic Memory help?   Dynamic Memory improves the memory utilization by removing the requirement to determine the memory need for an application. Hyper-V determines the memory needed by applications in the VM by evaluating the memory usage information in the guest with Dynamic Memory. VMs can start with a small amount of memory and they can be assigned more memory dynamically based on the workload of applications running inside.   Overview of Dynamic Memory Concepts   ·         Startup Memory: Startup Memory is the starting amount of memory when Dynamic Memory is enabled for a VM. Dynamic Memory will make sure that this amount of memory is always assigned to the VMs by default.   ·         Maximum Memory: Maximum Memory specifies the maximum amount of memory that a VM can grow to with Dynamic Memory. ·         Memory Demand: Memory Demand is the amount determined by Dynamic Memory as the memory needed by the applications in the VM. In Windows Server 2008 R2 SP1, this is equal to the total amount of committed memory of the VM. ·         Memory Buffer: Memory Buffer is the amount of memory assigned to the VMs in addition to their memory demand to satisfy immediate memory requirements and file cache needs.   Once Dynamic Memory is enabled for a VM, it will start with the “Startup Memory”. After the boot process Dynamic Memory will determine the “Memory Demand” of the VM. Based on this memory demand it will determine the amount of “Memory Buffer” that needs to be assigned to the VM. Dynamic Memory will assign the total of “Memory Demand” and “Memory Buffer” to the VM as long as this value is less than “Maximum Memory” and as long as physical memory is available on the host.   What happens when there is not enough physical memory available on the host?   Once there is not enough physical memory on the host to satisfy VM needs, Dynamic Memory will assign less than needed amount of memory to the VMs based on their importance. A concept known as “Memory Weight” is used to determine how much VMs should be penalized based on their needed amount of memory. “Memory Weight” is a configuration setting on the VM. It can be configured to be higher for the VMs with high performance requirements. Under high memory pressure on the host, the “Memory Weight” of the VMs are evaluated in a relative manner and the VMs with lower relative “Memory Weight” will be penalized more than the ones with higher “Memory Weight”.   Dynamic Memory Configuration   Based on these concepts “Startup Memory”, “Maximum Memory”, “Memory Buffer” and “Memory Weight” can be configured as shown below in Windows Server 2008 R2 SP1 Hyper-V Manager. Memory Demand is automatically calculated by Dynamic Memory once VMs start running.     Dynamic Memory Monitoring    In Windows Server 2008 R2 SP1, Hyper-V Manager displays the memory status of VMs in the following three columns:         ·         Assigned Memory represents the current physical memory assigned to the VM. In regular conditions this will be equal to the sum of “Memory Demand” and “Memory Buffer” assigned to the VM. When there is not enough memory on the host, this value can go below the Memory Demand determined for the VM. ·         Memory Demand displays the current “Memory Demand” determined for the VM. ·         Memory Status displays the current memory status of the VM. This column can represent three values for a VM: o   OK: In this condition the VM is assigned the total of Memory Demand and Memory Buffer it needs. o   Low: In this condition the VM is assigned all the Memory Demand and a certain percentage of the Memory Buffer it needs. o   Warning: In this condition the VM is assigned a lower memory than its Memory Demand. When VMs are running in this condition, it’s likely that they will exhibit performance problems due to internal paging happening in the VM.    So far so good! But how does it work with SQL Server?   SQL Server is aggressive in terms of memory usage for good reasons. This raises the question: How do SQL Server and Dynamic Memory work together? To understand the full story, we’ll first need to understand how SQL Server Memory Management works. This will be covered in our second post in “SQL and Dynamic Memory” series. Meanwhile if you want to dive deeper into Dynamic Memory you can check the below posts from the Windows Virtualization Team Blog:   http://blogs.technet.com/virtualization/archive/2010/03/18/dynamic-memory-coming-to-hyper-v.aspx   http://blogs.technet.com/virtualization/archive/2010/03/25/dynamic-memory-coming-to-hyper-v-part-2.aspx   http://blogs.technet.com/virtualization/archive/2010/04/07/dynamic-memory-coming-to-hyper-v-part-3.aspx   http://blogs.technet.com/b/virtualization/archive/2010/04/21/dynamic-memory-coming-to-hyper-v-part-4.aspx   http://blogs.technet.com/b/virtualization/archive/2010/05/20/dynamic-memory-coming-to-hyper-v-part-5.aspx   http://blogs.technet.com/b/virtualization/archive/2010/07/12/dynamic-memory-coming-to-hyper-v-part-6.aspx   - Serdar Sutay   Originally posted at http://blogs.msdn.com/b/sqlosteam/

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• access violation in wglMakeCurrent

  - by Stefan

  Sometimes in my OpenGL application I get an access violation in the following API call: wglMakeCurrent(NULL, NULL); The application only has one single thread, and I've checked that before that call, both the DC and HGLRC that are currently used are correct and valid. There are three different windows with OpenGL content, and they're all redrawn on WM_PAINT messages and if a refresh is required due to user interaction (e.g., picking an object). Also this access violation happens on different machines with different graphic cards, so I don't think it's a driver issue. What could make this API call crash? What should I investigate in the app code to find out where/why this happens? I'm really lost here since I've checked everything I could think of already. I hope someone can give me hints/ideas on what more to check.

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• General type conversion without risking Exceptions

  - by Mongus Pong

  I am working on a control that can take a number of different datatypes (anything that implements IComparable). I need to be able to compare these with another variable passed in. If the main datatype is a DateTime, and I am passed a String, I need to attempt to convert the String to a DateTime to perform a Date comparison. if the String cannot be converted to a DateTime then do a String comparison. So I need a general way to attempt to convert from any type to any type. Easy enough, .Net provides us with the TypeConverter class. Now, the best I can work out to do to determine if the String can be converted to a DateTime is to use exceptions. If the ConvertFrom raises an exception, I know I cant do the conversion and have to do the string comparison. The following is the best I got : string theString = "99/12/2009"; DateTime theDate = new DateTime ( 2009, 11, 1 ); IComparable obj1 = theString as IComparable; IComparable obj2 = theDate as IComparable; try { TypeConverter converter = TypeDescriptor.GetConverter ( obj2.GetType () ); if ( converter.CanConvertFrom ( obj1.GetType () ) ) { Console.WriteLine ( obj2.CompareTo ( converter.ConvertFrom ( obj1 ) ) ); Console.WriteLine ( "Date comparison" ); } } catch ( FormatException ) { Console.WriteLine ( obj1.ToString ().CompareTo ( obj2.ToString () ) ); Console.WriteLine ( "String comparison" ); } Part of our standards at work state that : Exceptions should only be raised when an Exception situation - ie. an error is encountered. But this is not an exceptional situation. I need another way around it. Most variable types have a TryParse method which returns a boolean to allow you to determine if the conversion has succeeded or not. But there is no TryConvert method available to TypeConverter. CanConvertFrom only dermines if it is possible to convert between these types and doesnt consider the actual data to be converted. The IsValid method is also useless. Any ideas? EDIT I cannot use AS and IS. I do not know either data types at compile time. So I dont know what to As and Is to!!! EDIT Ok nailed the bastard. Its not as tidy as Marc Gravells, but it works (I hope). Thanks for the inpiration Marc. Will work on tidying it up when I get the time, but I've got a bit stack of bugfixes that I have to get on with. public static class CleanConverter { /// <summary> /// Stores the cache of all types that can be converted to all types. /// </summary> private static Dictionary<Type, Dictionary<Type, ConversionCache>> _Types = new Dictionary<Type, Dictionary<Type, ConversionCache>> (); /// <summary> /// Try parsing. /// </summary> /// <param name="s"></param> /// <param name="value"></param> /// <returns></returns> public static bool TryParse ( IComparable s, ref IComparable value ) { // First get the cached conversion method. Dictionary<Type, ConversionCache> type1Cache = null; ConversionCache type2Cache = null; if ( !_Types.ContainsKey ( s.GetType () ) ) { type1Cache = new Dictionary<Type, ConversionCache> (); _Types.Add ( s.GetType (), type1Cache ); } else { type1Cache = _Types[s.GetType ()]; } if ( !type1Cache.ContainsKey ( value.GetType () ) ) { // We havent converted this type before, so create a new conversion type2Cache = new ConversionCache ( s.GetType (), value.GetType () ); // Add to the cache type1Cache.Add ( value.GetType (), type2Cache ); } else { type2Cache = type1Cache[value.GetType ()]; } // Attempt the parse return type2Cache.TryParse ( s, ref value ); } /// <summary> /// Stores the method to convert from Type1 to Type2 /// </summary> internal class ConversionCache { internal bool TryParse ( IComparable s, ref IComparable value ) { if ( this._Method != null ) { // Invoke the cached TryParse method. object[] parameters = new object[] { s, value }; bool result = (bool)this._Method.Invoke ( null, parameters); if ( result ) value = parameters[1] as IComparable; return result; } else return false; } private MethodInfo _Method; internal ConversionCache ( Type type1, Type type2 ) { // Use reflection to get the TryParse method from it. this._Method = type2.GetMethod ( "TryParse", new Type[] { type1, type2.MakeByRefType () } ); } } }

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• AddThis - contains too many device filters error

  - by Yousef_Jadallah

  When using AddThis service with asp.net, some exceptions will throw like these: The string 'fb:like:layout' contains too many device filters. There can be only one. The string 'g:plusone:size' contains too many device filters. There can be only one. You can solve this by using "In line server code".   Step 1: Implement the following code in your code file:   Protected Function GetFacebookAttribute() As String Return String .Format( "{0}=" "{1}" ""...(read more)

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• jQuery 1.4 Opacity and IE Filters

  - by Rick Strahl

  Ran into a small problem today with my client side jQuery library after switching to jQuery 1.4. I ran into a problem with a shadow plugin that I use to provide drop shadows for absolute elements – for Mozilla WebKit browsers the –moz-box-shadow and –webkit-box-shadow CSS attributes are used but for IE a manual element is created to provide the shadow that underlays the original element along with a blur filter to provide the fuzziness in the shadow. Some of the key pieces are: var vis = el.is(":visible"); if (!vis) el.show(); // must be visible to get .position var pos = el.position(); if (typeof shEl.style.filter == "string") sh.css("filter", 'progid:DXImageTransform.Microsoft.Blur(makeShadow=true, pixelradius=3, shadowOpacity=' + opt.opacity.toString() + ')'); sh.show() .css({ position: "absolute", width: el.outerWidth(), height: el.outerHeight(), opacity: opt.opacity, background: opt.color, left: pos.left + opt.offset, top: pos.top + opt.offset }); This has always worked in previous versions of jQuery, but with 1.4 the original filter no longer works. It appears that applying the opacity after the original filter wipes out the original filter. IOW, the opacity filter is not applied incrementally, but absolutely which is a real bummer. Luckily the workaround is relatively easy by just switching the order in which the opacity and filter are applied. If I apply the blur after the opacity I get my correct behavior back with both opacity: sh.show() .css({ position: "absolute", width: el.outerWidth(), height: el.outerHeight(), opacity: opt.opacity, background: opt.color, left: pos.left + opt.offset, top: pos.top + opt.offset }); if (typeof shEl.style.filter == "string") sh.css("filter", 'progid:DXImageTransform.Microsoft.Blur(makeShadow=true, pixelradius=3, shadowOpacity=' + opt.opacity.toString() + ')'); While this works this still causes problems in other areas where opacity is implicitly set in code such as for fade operations or in the case of my shadow component the style/property watcher that keeps the shadow and main object linked. Both of these may set the opacity explicitly and that is still broken as it will effectively kill the blur filter. This seems like a really strange design decision by the jQuery team, since clearly the jquery css function does the right thing for setting filters. Internally however, the opacity setting doesn’t use .css instead hardcoding the filter which given jQuery’s usual flexibility and smart code seems really inappropriate. The following is from jQuery.js 1.4: var style = elem.style || elem, set = value !== undefined; // IE uses filters for opacity if ( !jQuery.support.opacity && name === "opacity" ) { if ( set ) { // IE has trouble with opacity if it does not have layout // Force it by setting the zoom level style.zoom = 1; // Set the alpha filter to set the opacity var opacity = parseInt( value, 10 ) + "" === "NaN" ? "" : "alpha(opacity=" + value * 100 + ")"; var filter = style.filter || jQuery.curCSS( elem, "filter" ) || ""; style.filter = ralpha.test(filter) ? filter.replace(ralpha, opacity) : opacity; } return style.filter && style.filter.indexOf("opacity=") >= 0 ? (parseFloat( ropacity.exec(style.filter)[1] ) / 100) + "": ""; } You can see here that the style is explicitly set in code rather than relying on $.css() to assign the value resulting in the old filter getting wiped out. jQuery 1.32 looks a little different: // IE uses filters for opacity if ( !jQuery.support.opacity && name == "opacity" ) { if ( set ) { // IE has trouble with opacity if it does not have layout // Force it by setting the zoom level elem.zoom = 1; // Set the alpha filter to set the opacity elem.filter = (elem.filter || "").replace( /alpha\([^)]*\)/, "" ) + (parseInt( value ) + '' == "NaN" ? "" : "alpha(opacity=" + value * 100 + ")"); } return elem.filter && elem.filter.indexOf("opacity=") >= 0 ? (parseFloat( elem.filter.match(/opacity=([^)]*)/)[1] ) / 100) + '': ""; } Offhand I’m not sure why the latter works better since it too is assigning the filter. However, when checking with the IE script debugger I can see that there are actually a couple of filter tags assigned when using jQuery 1.32 but only one when I use jQuery 1.4. Note also that the jQuery 1.3 compatibility plugin for jQUery 1.4 doesn’t address this issue either. Resources ww.jquery.js (shadow plug-in $.fn.shadow) © Rick Strahl, West Wind Technologies, 2005-2010Posted in jQuery  

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• Overriding Equals method in Structs

  - by devoured elysium

  I've looked for overriding guidelines for structs, but all I can find is for classes. At first I thought I wouldn't have to check to see if the passed object was null, as structs are value types and can't be null. But now that I come to think of it, as equals signature is public bool Equals(object obj) it seems there is nothing preventing the user of my struct to be trying to compare it with an arbitrary reference type. My second point concerns the casting I (think I) have to make before I compare my private fields in my struct. How am I supposed to cast the object to my struct's type? C#'s as keyword seems only suitable for reference types. Thanks

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• Ubuntu 12.04 installation problem

  - by LittleLego

  Okay, at the beginning of the installation, it went well. My laptop is connected to power source, the internet, I have also checked the boxes "install updates while installation", "install third party plugin". After inputting location, keyboard layout info and user's details and password, the installation took place. But after 3/4 of the installation, it stopped, right above the progress bar, it displayed "installing system", I clicked on the arrow below it, the terminal-like screen also stopped carrying out the process. I then clicked on the "Skip" button, nothing happens. I thought it was the problem of my laptop, then I did another fresh installation, same thing happened. The terminal-like screen was showing some different words. But it's not an error message, just some installation info. Does anyone have valuable solution to this problem?

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• How can I extend DynamicQuery.cs to implement a .Single method?

  - by Yoenhofen

  I need to write some dynamic queries for a project I'm working on. I'm finding out that a significant amount of time is being spent by my program on the Count and First methods, so I started to change to .Single, only to find out that there is no such method. The code below was my first attempt at creating one (mostly copied from the Where method), but it's not working. Help? public static object Single(this IQueryable source, string predicate, params object[] values) { if (source == null) throw new ArgumentNullException("source"); if (predicate == null) throw new ArgumentNullException("predicate"); LambdaExpression lambda = DynamicExpression.ParseLambda(source.ElementType, typeof(bool), predicate, values); return source.Provider.CreateQuery( Expression.Call( typeof(Queryable), "Single", new Type[] { source.ElementType }, source.Expression, Expression.Quote(lambda))); }

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• JSF a4j:commandButton not working when 'disabled' is set

  - by Jon

  Hello, When I include a 'disabled' attribute on an a4j:commandButton, the button's action is not performed. Taking the 'disabled' attribute out causes it to work properly. I am not doing any special validation (that I'm aware of) and am not seeing any validation error messages. Here is part of my page: <t:dataTable id="myTable" var="region" value="#{MyPageBackingBean.regions}" width="100%"> ... <a4j:commandButton value="Update" action="#{region.doUpdate}" oncomplete="alert('done');" disabled="#{!empty region && region.messageEmpty}" immediate="true"/> ... </t:dataTable> Any ideas? Thanks! Edit: I tried setting preserveDataModel="true" on the t:dataTable to no avail. I also made a test having an a4j:commandButton and text box with no data table, but the backing bean action is still not being fired: <h:form> <a4j:region> <a4j:outputPanel id="testregion"> <h:messages id="messages"/> <a4j:status> <f:facet name="start"> <h:graphicImage value="/images/progress_indicator.gif"/> </f:facet> </a4j:status> <h:inputTextarea rows="5" value="#{MyPageBackingBean.myValue}" style="width:100%; border: 1px solid #99CCFF;"> <a4j:support event="onkeyup" reRender="testregion" eventsQueue="messageModificationQueue" ignoreDupResponses="true" requestDelay="500"/> </h:inputTextarea> <a4j:commandButton id="doDelete" value="Delete" action="#{MyPageBackingBean.dummy}" reRender="testregion" disabled="#{empty MyPageBackingBean.myValue}"/> <h:outputText value="#{MyPageBackingBean.myValue}"/> </a4j:outputPanel> </a4j:region> </h:form> Here is the new backing bean code used for testing: private String m_myValue = null; public String getMyValue() { return m_myValue; } public void setMyValue(String value) { m_myValue = value; } private String mystr2 = null; public String dummy() { mystr2 = "hello"; return null; } Thanks!

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• Bootstrap responsive CSS [migrated]

  - by savolai

  I have a four column design and I am using Bootstrap. The design renders fine in a single column in mobile devices, but in "(min-width: 768px) and (max-width: 979px)", I get four columns though there is room for only two. So clearly, the rows/spans setup would need to be rethought for those sizes. The only way I can imagine of doing this is to have semantic CSS classes used in the HTML and only including grid classes in the CSS using LESS, and then depending on screen size, including different grid classes to achieve four or two column layout. Not sure if this would work either though. Is this the way to go with, or am I thinking this too complicatedly? Thanks! Also at: https://groups.google.com/forum/#!topic/twitter-bootstrap/R5jEp0oQ_-E

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• Android:How to display images from the in a ListView?

  - by Maxood

  Android:How to display images from the web in a ListView?I have the following code to display image from a URL in an ImageView: import java.io.IOException; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLConnection; import android.app.ListActivity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.widget.ImageView; public class HttpImgDownload extends ListActivity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Bitmap bitmap = // DownloadImage( // "http://www.streetcar.org/mim/cable/images/cable-01.jpg"); DownloadImage( "http://s.twimg.com/a/1258674567/images/default_profile_3_normal.png"); ImageView img = (ImageView) findViewById(R.id.img); img.setImageBitmap(bitmap); } private InputStream OpenHttpConnection(String urlString) throws IOException { InputStream in = null; int response = -1; URL url = new URL(urlString); URLConnection conn = url.openConnection(); if (!(conn instanceof HttpURLConnection)) throw new IOException("Not an HTTP connection"); try{ HttpURLConnection httpConn = (HttpURLConnection) conn; httpConn.setAllowUserInteraction(false); httpConn.setInstanceFollowRedirects(true); httpConn.setRequestMethod("GET"); httpConn.connect(); response = httpConn.getResponseCode(); if (response == HttpURLConnection.HTTP_OK) { in = httpConn.getInputStream(); } } catch (Exception ex) { throw new IOException("Error connecting"); } return in; } private Bitmap DownloadImage(String URL) { Bitmap bitmap = null; InputStream in = null; try { in = OpenHttpConnection(URL); bitmap = BitmapFactory.decodeStream(in); in.close(); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } return bitmap; } } Now how can i display images in an array in a listview? Here's how i want to display the images: http://sites.google.com/site/androideyecontact/_/rsrc/1238086823282/Home/android-eye-contact-lite/eye_contact-list_view_3.png?height=420&width=279

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• XCode iPhone Programming: Loading a jpg into a UIImageView from URL

  - by Antonio Murgia

  My app has to load an image from a http server and displaying it into an UIImageView How can i do that?? I tried this: NSString *temp = [NSString alloc]; [temp stringwithString:@"http://192.168.1.2x0/pic/LC.jpg"] temp=[(NSString *)CFURLCreateStringByAddingPercentEscapes( nil, (CFStringRef)temp, NULL, NULL, kCFStringEncodingUTF8) autorelease]; NSData *dato = [NSData alloc]; dato=[NSData dataWithContentsOfURL:[NSURL URLWithString:temp]]; pic = [pic initWithImage:[UIImage imageWithData:dato]]; This code is in viewdidload of the view but nothing is displayed! The server is working because i can load xml files from it. but i can't display that image! I need to load the image programmatically because it has to change depending on the parameter passed! Thank you in advance. Antonio

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• Datatemplates while using theme does not work - WPF

  - by bobjink

  I am using the theme DarkExpression from WPF Futures. It does not seem to work well with datatemplates. Scenario 1: Here is how it looks like without datatemplates: Pic 1 Code: <ListView Name="playlistListView" ItemsSource="{Binding PlaylistList}" Margin="0" SelectionChanged="DatabindedPlaylistListView_SelectionChanged" Background="{x:Null}" Opacity="0.98"> <ListView.View> <GridView> <GridViewColumn Width="Auto" DisplayMemberBinding="{Binding Name}"> <GridViewColumnHeader HorizontalContentAlignment="Left" Content="Playlist" Tag="Playlist"/> </GridViewColumn> </GridView> </ListView.View> </ListView> Scenario 2: Here is how it looks like trying to use datatemplates while using the theme: Pic 2 Code: <ListView Name="playlistListView" ItemsSource="{Binding PlaylistList}" Margin="0" SelectionChanged="DatabindedPlaylistListView_SelectionChanged" Background="{x:Null}" Opacity="0.98"> <ListView.ItemTemplate> <DataTemplate> <Grid> <UserControls:SongDataTemplate Margin="4" /> </Grid> </DataTemplate> </ListView.ItemTemplate> </ListView> Scenario 3: Here is how it looks like trying to use datatemplates while overriding the theme: Pic3 Code: <UserControl.Resources> <Style x:Key="ListViewItemStretch" TargetType="{x:Type ListViewItem}"> <Setter Property="HorizontalContentAlignment" Value="Stretch"/> <Setter Property="Background" Value="Transparent" /> </Style> </UserControl.Resources> <Grid x:Name="LayoutRoot"> <ListView Name="playlistListView" ItemContainerStyle="{StaticResource ListViewItemStretch}" ItemsSource="{Binding PlaylistList}" Margin="0" SelectionChanged="DatabindedPlaylistListView_SelectionChanged" Background="{x:Null}" Opacity="0.98"> <ListView.ItemTemplate> <DataTemplate> <Grid> <UserControls:SongDataTemplate Margin="4" /> </Grid> </DataTemplate> </ListView.ItemTemplate> </ListView> I want to keep the theme style but I also want to use datatemplates to define how a playlist should look like. Any suggestions? Note: In scenario 2 and 3 I had to remove <ListView.View> <GridView> <GridViewColumn Width="Auto" DisplayMemberBinding="{Binding Name}"> <GridViewColumnHeader HorizontalContentAlignment="Left" Content="Playlist" Tag="Playlist"/> </GridViewColumn> </GridView> </ListView.View> Before the datatemplate would be used.

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• NInject and thread-safety

  - by cbp

  I am having problems with the following class in a multi-threaded environment: public class Foo { [Inject] public IBar InjectedBar { get; set; } public bool NonInjectedProp { get; set; } public void DoSomething() { /* The following line is causing a null-reference exception */ InjectedBar.DoSomething(); } public Foo(bool nonInjectedProp) { /* This line should inject the InjectedBar property */ KernelContainer.Inject(this); NonInjectedProp = nonInjectedProp; } } This is a legacy class which is why I am using property rather than constructor injection. Sometime when the DoSomething() is called the InjectedBar property is null. In a single-threaded application, everything runs fine. How can this be occuring and how can I prevent it?

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• Opengl glVertexAttrib4fv doesn't work?

  - by Naor

  This is my vertex shader: static const GLchar * vertex_shader_source[] = { "#version 430 core \n" "layout (location = 0) in vec4 offset; \n" "void main(void) \n" "{ \n" " const vec4 vertices[3] = vec4[3](vec4( 0.25, -0.25, 0.5, 1.0),\n" " vec4(-0.25, -0.25, 0.5, 1.0), \n" " vec4( 0.25, 0.25, 0.5, 1.0)); \n" " gl_Position = vertices[gl_VertexID] + offset; \n" "} \n" }; and this is what im trying to do: glUseProgram(rendering_program); GLfloat attrib[] = { (float)sin(currentTime) * 0.5f, (float)cos(currentTime) * 0.6f, 0.0f, 0.0f }; glVertexAttrib4fv(0, attrib); glDrawArrays(GL_TRIANGLES, 0, 3); currentTime - The number in seconds since the program has started. Expected result - Triangle moving around the window. Its from the SuperBible book (sixth edition), this is the full code:http://pastebin.com/xA3eCKz1 The triangle should move across the screen but it doesn't.

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• Custom Model binder not firing

  - by mare

  This is my custom model binder. I have my breakpoint set at BindModel but does not get fired with this controller action: public ActionResult Create(TabGroup tabGroup) ... public class BaseContentObjectCommonPropertiesBinder : DefaultModelBinder { public new object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) { if (controllerContext == null) { throw new ArgumentNullException("controllerContext"); } if (bindingContext == null) { throw new ArgumentNullException("bindingContext"); } BaseContentObject obj = (BaseContentObject)base.BindModel(controllerContext, bindingContext); obj.Modified = DateTime.Now; obj.Created = DateTime.Now; obj.ModifiedBy = obj.CreatedBy = controllerContext.HttpContext.User.Identity.Name; return obj; } My registration: // tried both of these two lines ModelBinders.Binders[typeof(TabGroup)] = new BaseContentObjectCommonPropertiesBinder(); ModelBinders.Binders.Add(typeof(TabGroup), new BaseContentObjectCommonPropertiesBinder());

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• Intermittent PolicyException: Execution permission cannot be acquired.

  - by Aaron Maenpaa

  We are intermittently seeing the following exception shortly after an App Pool recycle in an ASP.NET application: System.Configuration.ConfigurationErrorsException: Could not load file or assembly 'Microsoft.Web.Mvc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. Failed to grant permission to execute. (Exception from HRESULT: 0x80131418) ---> System.IO.FileLoadException: Could not load file or assembly 'Microsoft.Web.Mvc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. Failed to grant permission to execute. (Exception from HRESULT: 0x80131418) File name: 'Microsoft.Web.Mvc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' ---> System.Security.Policy.PolicyException: Execution permission cannot be acquired. at System.Security.SecurityManager.ResolvePolicy(Evidence evidence, PermissionSet reqdPset, PermissionSet optPset, PermissionSet denyPset, PermissionSet& denied, Boolean checkExecutionPermission) at System.Security.SecurityManager.ResolvePolicy(Evidence evidence, PermissionSet reqdPset, PermissionSet optPset, PermissionSet denyPset, PermissionSet& denied, Int32& securitySpecialFlags, Boolean checkExecutionPermission) at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) at System.Reflection.Assembly.Load(String assemblyString) at System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) The specific DLL that fails to load varies from incident to incident, but is always one referenced by the main assembly. We're running on ASP.NET 3.5 on Windows Server 2008. This seems to happen in batches affecting some but not all of sites on the same App Pool. We have a large number of sites all running the same code. Once a site has failed to load a DLL it throws up a Yellow Screen of Death until the next App Pool recycle. We haven't been able to reproduce this behavior and the sites seem to work fine for days or weeks at a time (and many App Pool recycles) before failing. Has anybody else seen similar behavior? Update: We've tried reproducing the failure by setting up a few hundred sites and writing a script to hit them repeatedly while recycling the App Pool once every couple of minutes and were unable to accomplish much other than loading down the server's CPU for a few days straight. We then tried messing (locking one of the DLLs, changing the file permissions) with the copies of the DLLs that ASP.NET makes and managed to reproduce similar behavior but not the same exception. Does anybody have any ideas on how to adjust the security policy to get it to throw a System.Security.Policy.PolicyException: Execution permission cannot be acquired. when loading a specific DLL?

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• No endpoint mapping found for..., using SpringWS, JaxB Marshaller

  - by Saky

  I get this error: No endpoint mapping found for [SaajSoapMessage {http://mycompany/coolservice/specs}ChangePerson] Following is my ws config file: <bean class="org.springframework.ws.server.endpoint.mapping.PayloadRootAnnotationMethodEndpointMapping"> <description>An endpoint mapping strategy that looks for @Endpoint and @PayloadRoot annotations.</description> </bean> <bean class="org.springframework.ws.server.endpoint.adapter.MarshallingMethodEndpointAdapter"> <description>Enables the MessageDispatchServlet to invoke methods requiring OXM marshalling.</description> <constructor-arg ref="marshaller"/> </bean> <bean id="marshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller"> <property name="contextPaths"> <list> <value>org.company.xml.persons</value> <value>org.company.xml.person_allextensions</value> <value>generated</value> </list> </property> </bean> <bean id="persons" class="com.easy95.springws.wsdl.wsdl11.MultiPrefixWSDL11Definition"> <property name="schemaCollection" ref="schemaCollection"/> <property name="portTypeName" value="persons"/> <property name="locationUri" value="/ws/personnelService/"/> <property name="targetNamespace" value="http://mycompany/coolservice/specs/definitions"/> </bean> <bean id="schemaCollection" class="org.springframework.xml.xsd.commons.CommonsXsdSchemaCollection"> <property name="xsds"> <list> <value>/DataContract/Person-AllExtensions.xsd</value> <value>/DataContract/Person.xsd</value> </list> </property> <property name="inline" value="true"/> </bean> I have then the following files: public interface MarshallingPersonService { public final static String NAMESPACE = "http://mycompany/coolservice/specs"; public final static String CHANGE_PERSON = "ChangePerson"; public RespondPersonType changeEquipment(ChangePersonType request); } and @Endpoint public class PersonEndPoint implements MarshallingPersonService { @PayloadRoot(localPart=CHANGE_PERSON, namespace=NAMESPACE) public RespondPersonType changePerson(ChangePersonType request) { System.out.println("Received a request, is request null? " + (request == null ? "yes" : "no")); return null; } } I am pretty much new to WebServices, and not very comfortable with annotations. I am following a tutorial on setting up jaxb marshaller in springws. I would rather use xml mappings than annotations, although for now I am getting the error message.

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• Implement JNI listener.

  - by G B

  I have the following code in a c++ "listener class" (more or less), which calls some function of a Java object. I suspect there's a memory leak: JNIEnv *env = NULL; vm_->AttachCurrentThread(&env, NULL); const jclass cls = env->FindClass(...); const jmethodID meth = env->GetMethodID(...); const jobject obj = env->NewObject(cls, meth, ...); [ more code ] env->DeleteLocalRef(obj); My question is: should I also release the local reference of cls and meth? JNI Documentation isn't very clear about it.

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• OData and custom WCF WebGet methods

  - by reinier

  I've created an OData endpoint (using entity framework, WCF data service) and added a custom test WebGet test method like so: [WebGet(UriTemplate = "{text}")] public IQueryable<string> SplitString(string text) { if (text == null) throw new DataServiceException("text not specified"); var result = (from s in text.Split('-') orderby s select s); return result.AsQueryable(); } and a config line: config.SetServiceOperationAccessRule("SplitString", ServiceOperationRights.All); However, no matter how I specify the url, I can not get the text param to be filled out. (it is always null). so: http://localhost/myservice.svc/SplitString/testtext does not work. What is the correct url format (or UriTemplate) one should use? The only examples I found of odata and WebGet only have an example method which doesn't have any parameters.

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