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POC# Thread-safe Extension Method
 

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    <p>I may be waaaay off, or else really close. Either way, I'm currently SOL. :) </p> <p>I want to be able to use an extension method to set properties on a class, but that class may (or may not) be updated on a non-UI thread, and derives from a class the enforces updates to be on the UI thread (which implements INotifyPropertyChanged, etc).</p> <p>I have a class defined something like this:</p> <pre><code>public class ClassToUpdate : UIObservableItem { private readonly Dispatcher mDispatcher = Dispatcher.CurrentDispatcher; private Boolean mPropertyToUpdate = false; public ClassToUpdate() : base() { } public Dispatcher Dispatcher { get { return mDispatcher; } } public Boolean PropertyToUpdate { get { return mPropertyToUpdate; } set { SetValue("PropertyToUpdate", ref mPropertyToUpdate, value; } } } </code></pre> <p>I have an extension method class defined something like this:</p> <pre><code>static class ExtensionMethods { public static IEnumerable&lt;T&gt; SetMyProperty&lt;T&gt;(this IEnumerable&lt;T&gt; sourceList, Boolean newValue) { ClassToUpdate firstClass = sourceList.FirstOrDefault() as ClassToUpdate; if (firstClass.Dispatcher.Thread.ManagedThreadId != System.Threading.Thread.CurrentThread.ManagedThreadId) { // WHAT GOES HERE? } else { foreach (var classToUpdate in sourceList) { (classToUpdate as ClassToUpdate ).PropertyToUpdate = newValue; yield return classToUpdate; } } } } </code></pre> <p>Obviously, I'm looking for the "WHAT GOES HERE" in the extension method.</p> <p>Thanks, wTs</p>
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    1. USWonko the Sane
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    1. COYou have an enumerator called 'SetMyProperty' ? Maybe you should first decide what this function should actually do ?
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      1. USHenk Holterman
    2. CO@Henk: actually, I think it's some kind of fluent API : `sourceList.SetMyProperty(true).SetMyOtherProperty("hello").SetFoo(42)...`
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      1. USThomas Levesque
    3. COExtension methods are nothing more than static methods can know how to 'decorate' values (this operation is done ENTIRELY at compile-time). Their thread-safety is in relation to what they do, and from what context. However, there is otherwise nothing special about them wrt. threading. I generally like to use SynchronizationContext's and dispatchers.
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