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POIs it a bug that Delegate.CreateDelegate cannot bind to struct member overrides?
 

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  1. POIs it a bug that Delegate.CreateDelegate cannot bind to struct member overrides?
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    <p>After following the answer on this I discovered that I have to use a <code>ref</code> parameter to call instance method on structs. <a href="https://stackoverflow.com/questions/4326736/how-can-i-create-an-open-delegate-from-a-structs-instance-method/4327011#4327011">How can I create an open Delegate from a struct&#39;s instance method?</a></p> <p>I cannot seem to bind to method overrides like explicit interface implementations (to avoid the boxing penalty associated, (which are really overrides as far as the IL is concerned)), Here is a bug report saying that in a future version of .NET, we can bind to interface members found on a struct: <a href="https://connect.microsoft.com/VisualStudio/feedback/details/574959/cannot-create-open-instance-delegate-for-value-types-methods-which-implement-an-interface?wa=wsignin1.0#details" rel="nofollow noreferrer">https://connect.microsoft.com/VisualStudio/feedback/details/574959/cannot-create-open-instance-delegate-for-value-types-methods-which-implement-an-interface?wa=wsignin1.0#details</a></p> <p>But even trying to bind to members like <code>Equals</code>,<code>GetHashCode</code>,or <code>ToString</code> leads to errors e.g.</p> <pre><code>public struct A { public override int GetHashCode(){/*implementation goes here*/} } delegate TRet FuncByRef&lt;TStruct,TRet&gt;(ref TStruct) where TStruct:struct </code></pre> <p>...</p> <pre><code>Delegate.CreateDelegate(typeof(FuncByRef&lt;A,int&gt;),typeof(A).GetMethod("GetHashCode")); </code></pre> <p>will fail with the exception "Error binding to target method".</p>
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    1. USMichael B
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    1. CORe the boxing overhead / virtual; note that the interface treatment is only available with the constrained opcode, usually via a generic constraint. The handling of the virtual methods depends on whether it has been overridden (then it can use static-call) or not (virtual-call).
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      1. POIs it a bug that Delegate.CreateDelegate cannot bind to struct member overrides?
      1. USMarc Gravell
    2. CO@Marc Gravell, I'm not sure if this is correct I can call `Int32.ToInt64(null)` inside an expression tree for instance and there doesn't appear to be any boxing. As the method performs faster than if I first cast it to `IConvertible`
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      1. POIs it a bug that Delegate.CreateDelegate cannot bind to struct member overrides?
      1. USMichael B
 

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