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    <p>I would like to point out that comparing this incident to the 'int' case is probably inherently wrong since even though 'int' is atomic, it is a value type.</p> <p>But I think we've solved the case:</p> <blockquote> <p>Combining operations, such as Combine and Remove, do not alter existing delegates. Instead, such an operation returns a new delegate that contains the results of the operation, an unchanged delegate, or null. A combining operation returns null when the result of the operation is a delegate that does not reference at least one method. A combining operation returns an unchanged delegate when the requested operation has no effect.</p> </blockquote> <p><a href="http://msdn.microsoft.com/en-us/library/system.delegate.combineimpl.aspx" rel="nofollow">Delegate.CombineImpl Method</a> shows the implementation.</p> <p>I looked over the implementation of Delegate and MulticastDelegate in the .NET 4 source code. Neither of them declare the += or -= operator. Coming to think of it, in Visual Basic.NET you don't even have them, you use AddHandler, etc... </p> <p>This means that the C# compiler implements this functionality and that the type doesn't really have anything to do with defining specialized operators.</p> <p>So this leads me to a logical conclusion which is, when you do:</p> <pre><code>EventHandler handler = MyEvent; </code></pre> <p>the C# compiler translates it to</p> <pre><code>EventHandler handler = EventHandler.Combine(MyEvent) </code></pre> <p>I'm surprised how quickly this question was solved thanks to your help.</p> <p>Thank you very much indeed!</p>
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    1. PO.NET: How does the EventHandler race-condition fix work?
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    1. USYam Marcovic
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    1. COThat's not correct, it just copies the value of the backing field (a reference) to the local. There's no call to Delegate.Combine there.
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    2. COWhy would it copy it? I'm reminding you we're talking about a reference type and not a value type.
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    3. COThe fact that `int` is a value type does not change the semantics of assignment.
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      1. USDan Tao
 

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