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POInvalidProgramException trying to call a static method via Reflection.Emit
 

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  1. POInvalidProgramException trying to call a static method via Reflection.Emit
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    <p>I'm trying to make a dynamic type that basically wraps some methods on a static class. I've created a static method called Wrap that has a generic parameter which should be an interface, and one normal parameter which is the type of class that has the static methods.</p> <p>e.g.</p> <pre><code>IInterfaceTest obj = StaticInterface.Wrap&lt;IInterfaceTest&gt;(typeof(StaticClassNameHere)); obj.TestInterfaceMethod(); </code></pre> <p>But the code I'm generating is obviously broken somewhere as I get an InvalidProgramException when I call the method.</p> <p>I based my code on the ILDasm output of a test class I made, and as far as I can tell, I'm outputting the same code. But it ain't working...</p> <pre><code>public static class StaticInterface { private static AssemblyBuilder _asm = null; private static ModuleBuilder _mod = null; private static Type _thisType = typeof(StaticInterface); private static int _count = 0; public static T Wrap&lt;T&gt;(Type type) { ILGenerator ilgen; if (_asm == null) { _asm = AppDomain.CurrentDomain.DefineDynamicAssembly(new System.Reflection.AssemblyName(_thisType.Name), AssemblyBuilderAccess.Run); _mod = _asm.DefineDynamicModule(_thisType.Name); } string newTypeName = _thisType.Name + "._" + _count++; TypeBuilder typBuilder = _mod.DefineType(newTypeName, System.Reflection.TypeAttributes.Class | System.Reflection.TypeAttributes.Public); typBuilder.AddInterfaceImplementation(typeof(T)); ConstructorBuilder conBuilder = typBuilder.DefineDefaultConstructor(System.Reflection.MethodAttributes.Public); foreach (MethodInfo method in typeof(T).GetMethods()) { ParameterInfo[] parameters = method.GetParameters(); Type[] paramTypes = new Type[parameters.Length]; for (int j = 0; j &lt; parameters.Length; j++) { paramTypes[j] = parameters[j].ParameterType; } MethodBuilder mth = typBuilder.DefineMethod(method.Name, MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.HideBySig | MethodAttributes.NewSlot | MethodAttributes.Final, method.ReturnType, paramTypes); ilgen = mth.GetILGenerator(); ilgen.Emit(OpCodes.Nop); for (short j = 0; j &lt; parameters.Length; j++) { ilgen.Emit(OpCodes.Ldarg, j + 1); } MethodInfo callMeth = type.GetMethod(method.Name, BindingFlags.Public | BindingFlags.Static, null, paramTypes, null); ilgen.EmitCall(OpCodes.Call, callMeth, null); if (method.ReturnType != null &amp;&amp; method.ReturnType != typeof(void)) { ilgen.Emit(OpCodes.Stloc_0); Label end = ilgen.DefineLabel(); ilgen.Emit(OpCodes.Br_S, end); ilgen.MarkLabel(end); ilgen.Emit(OpCodes.Ldloc_0); } ilgen.Emit(OpCodes.Ret); } typBuilder.CreateType(); return (T)_asm.CreateInstance(newTypeName, false, BindingFlags.Public | BindingFlags.Instance, null, null, null, null); } } </code></pre>
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    1. USRickyD
    1. USMadSkunk
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    1. COCan we see the method that you are calling/wrapping? i.e. can you make this a complete (runnable, but minimal) example? Unfortunately, the ***exact*** context is very important when understanding emit.
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      1. POInvalidProgramException trying to call a static method via Reflection.Emit
      1. USMarc Gravell
 

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