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POEmitting Generic Method using Reflection Throws an Exception at Invoke
 

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  1. POEmitting Generic Method using Reflection Throws an Exception at Invoke
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    <p>I am trying this simple example on creating a generic method using Reflection.Emit but it is causing an exception when calling Invoke and I can't find the problem.</p> <pre><code>public class Program { public static void Main(string[] args) { AppDomain appDomain = AppDomain.CurrentDomain; AssemblyName name = new AssemblyName("MyAssembly") { Version = new Version("1.0.0.0") }; AssemblyBuilder ab = appDomain.DefineDynamicAssembly(name, AssemblyBuilderAccess.RunAndSave); ModuleBuilder mb = ab.DefineDynamicModule("MyModule", "MyAssembly.dll"); TypeBuilder tb = mb.DefineType("Widget", TypeAttributes.Public); // Define a method builder MethodBuilder methodBuilder = tb.DefineMethod("MyGenericMethod", MethodAttributes.Public | MethodAttributes.Static); // Get generic type parameter builders GenericTypeParameterBuilder[] genericParams = methodBuilder.DefineGenericParameters("TKey", "TValue"); methodBuilder.SetSignature(typeof(int), null, null, genericParams, null, null); methodBuilder.DefineParameter(1, ParameterAttributes.None, "key"); methodBuilder.DefineParameter(2, ParameterAttributes.None, "val"); ILGenerator gen = methodBuilder.GetILGenerator(); MethodInfo writeLineStr = typeof(Console).GetMethod("WriteLine", new[] { typeof(object) }); gen.Emit(OpCodes.Ldarg_0); gen.Emit(OpCodes.Box, genericParams[0]); gen.Emit(OpCodes.Call, writeLineStr); gen.Emit(OpCodes.Ldarg_1); gen.Emit(OpCodes.Box, genericParams[1]); gen.Emit(OpCodes.Call, writeLineStr); gen.Emit(OpCodes.Ret); Type t = tb.CreateType(); MethodInfo genMeth = t.GetMethod("MyGenericMethod").MakeGenericMethod(typeof(string), typeof(int)); genMeth.Invoke(null, new object[] { "NumberKey", 100 }); } } </code></pre> <p>When calling genMeth.Invoke, the following exception is thrown</p> <pre><code>Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the t arget of an invocation. ---&gt; System.InvalidProgramException: Common Language Runtime detected an inv alid program. at Widget.MyGenericMethod[TKey,TValue](TKey key, TValue val) --- End of inner exception stack trace --- at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Bool ean constructor) at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Obje ct[] arguments) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters) at ReflectionEmitDemo14.Program.Main(String[] args) in d:\Projects\ReflectionEmitDemo\ReflectionE mitDemo14\Program.cs:line 50 </code></pre>
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