绑定到C#3.0中的目标方法时出错

时间:2010-10-05 06:35:06

标签: reflection c#-3.0 delegates

我正在尝试使用反射来连接代理。这就是我到目前为止所做的事情

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Data;
using System.Threading;
using System.IO;
using System.Reflection;
using System.Windows;

namespace ChartHelper
{
    public class ICChartHelper
    {        

        public void RefreshChart()
        {
            try
            {   
                Assembly myobj = Assembly.LoadFrom(@"C:\sample.dll");

                foreach (Type mytype in myobj.GetTypes())
                {

                    if (mytype.IsClass == true)
                    {
                        if (mytype.FullName.EndsWith("." + "ICAutomationProxy"))
                        {
                            // create an instance of the object
                            object ClassObj = Activator.CreateInstance(mytype);

               //  var eventTypes = mytype.GetEvents();

                            EventInfo evClick = mytype.GetEvent("OnRefreshCompleted");
                            Type tDelegate = evClick.EventHandlerType;

                            MethodInfo miHandler =
                           typeof(ChartHelper.ICChartHelper)
                           .GetMethod("RefreshApplication",
                            BindingFlags.NonPublic | BindingFlags.Instance);

                            Delegate d = Delegate.CreateDelegate(tDelegate,typeof(ChartHelper.ICChartHelper), miHandler);

                            MethodInfo addHandler = evClick.GetAddMethod();
                            Object[] addHandlerArgs = { d };
                            addHandler.Invoke(ClassObj, addHandlerArgs);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        private void RefreshApplication(Object sender, EventArgs e)
        {
            MessageBox.Show("Bingo");
        }

但是在

委托d = Delegate.CreateDelegate(tDelegate,typeof(ChartHelper.ICChartHelper),miHandler);

行,我遇到错误Error binding to target method

我也发现了here并试图解决同样但没有运气。

我需要帮助才能理解我在做什么?

由于

1 个答案:

答案 0 :(得分:3)

您的方法是一个实例方法,因此您需要使用CreateDelegate的重载来获取委托的目标,并传入声明类型的实例。例如:

Delegate d = Delegate.CreateDelegate(tDelegate, new ICChartHelper(), miHandler);

请注意,您无需在GetAddMethod上致电EventInfo并使用反射调用该功能 - 您只需使用EventInfo.AddEventHandler