void* functionPointer = (void*)Marshal.GetFunctionPointerForDelegate(CreateDelegate(theCSFunction,0));

 void* functionPointer = (void*)Marshal.GetFunctionPointerForDelegate(CreateDelegate(theCSFunction,0));

  public static Delegate CreateDelegate(this MethodInfo methodInfo, object target) {
            Func<Type[], Type> getType;
            var isAction = methodInfo.ReturnType.Equals((typeof(void)));
            var types = methodInfo.GetParameters().Select(p => p.ParameterType);
            if (isAction) {
                getType = Expression.GetActionType;
            }
            else {
                getType = Expression.GetFuncType;
                types = types.Concat(new[] { methodInfo.ReturnType });
            }
            if (methodInfo.IsStatic) {
                return Delegate.CreateDelegate(getType(types.ToArray()), methodInfo);
            }
            return Delegate.CreateDelegate(getType(types.ToArray()), target, methodInfo.Name);
        }

  public static Delegate CreateDelegate(this MethodInfo methodInfo, object target) {
            Func<Type[], Type> getType;
            var isAction = methodInfo.ReturnType.Equals((typeof(void)));
            var types = methodInfo.GetParameters().Select(p => p.ParameterType);
            if (isAction) {
                getType = Expression.GetActionType;
            }
            else {
                getType = Expression.GetFuncType;
                types = types.Concat(new[] { methodInfo.ReturnType });
            }
            if (methodInfo.IsStatic) {
                return Delegate.CreateDelegate(getType(types.ToArray()), methodInfo);
            }
            return Delegate.CreateDelegate(getType(types.ToArray()), target, methodInfo.Name);
        }