Reflection.Emit を使用してジェネリック メソッドを作成するこの簡単な例を試していますが、Invoke を呼び出すときに例外が発生し、問題が見つかりません。
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 });
}
}
genMeth.Invoke を呼び出すと、次の例外がスローされます
Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the t
arget of an invocation. ---> 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