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copied!<p><strong>EDIT 2</strong> I don't believe this answer anymore, but I left it here so the thread would still make sense and so that people would see why it isn't right. See my other answer for a different take on the matter.</p> <p><strong>Original</strong></p> <p>Because it would require implicitly boxing the value type receiver parameter (because the _target field in the System.Delegate type which holds the the receiver parameter is of type System.Object), which could lead to some strange aliasing behavior if you weren't expecting it.</p> <p><strong>EDIT</strong></p> <p>There is something else going on here. I ran this sample program:</p> <pre><code>class Program { public static int Combine(int a, int b) { return a + b; } static void Main(string[] args) { var combineMethod = typeof(Program).GetMethod("Combine"); var add4 = Delegate.CreateDelegate( typeof(Converter<int, int>), 4, combineMethod) as Converter<int, int>; for (int i = 0; i < 10; i++) { Console.WriteLine(add4(i)); } Console.ReadLine(); } } </code></pre> <p>and got an ArgumentException: "Error binding to target method." at the call to CreateDelegate. I'm not sure why, and because the relevant method is an <code>internalcall</code> method, Reflector isn't much help. The <a href="http://msdn.microsoft.com/en-us/library/74x8f551.aspx" rel="nofollow noreferrer">documentation for CreateDelegate</a> also wasn't much help. I'm sure it has something to do with boxing the receiver, maybe someone with knowledge of the Rotor source could help explain why?</p>

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