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POReflection.Emit and generic types
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  1. POReflection.Emit and generic types
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    copied!<p>I am using <code>Reflection.Emit</code> and I want to create a type that would be the equivalent of the following type defined in C#:</p> <pre><code>class A { public Tuple&lt;A, int&gt; GetValue(int x) { return new Tuple&lt;A, int&gt;(this, x); } } </code></pre> <p>The trick is that I need to use a generic type from BCL that uses my custom type as a generic argument.</p> <p>I'm messing with the following snippet:</p> <pre><code>var asmName = new AssemblyName("Test"); var access = AssemblyBuilderAccess.Run; var asm = AppDomain.CurrentDomain.DefineDynamicAssembly(asmName, access); var module = asm.DefineDynamicModule("Test"); var aType = module.DefineType("A"); var tupleType = typeof(Tuple&lt;,&gt;).MakeGenericType(aType, typeof(int)); var attrs = MethodAttributes.Public; var method = aType.DefineMethod("GetValue", attrs, tupleType, new [] { typeof(int) }); var gen = method.GetILGenerator(); gen.Emit(OpCodes.Ldarg_0); gen.Emit(OpCodes.Ldarg_1); // here is the fail: var ctor = tupleType.GetConstructor(new [] { typeof(int), aType } ); gen.Emit(OpCodes.Newobj, ctor); </code></pre> <p>The call to <code>GetConstructor</code> fails with the following exception:</p> <blockquote> <p>NotSupportedException: Specified method is not supported.</p> </blockquote> <p>So, basically, it won't let me get the constructor of a type that merely references my custom type, and neither can I finalize the type before emitting the body of its method.</p> <p>Can it really be impossible to get out of this vicious circle?</p>
 

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