C#反射调用私有方法

 public object CallNonPublicMethod(object instance, string methodName, object[] param)        {            Type type = instance.GetType();            MethodInfo method = type.GetMethod(methodName, BindingFlags.Instance | BindingFlags.NonPublic);            object result;            try            {                result = method.Invoke(instance, param);            }            catch (TargetInvocationException ex)            {                throw ex.InnerException;            }            return result;        }