使用反射的addEventHandler [英] AddEventHandler using reflection

问题描述

我有这块code不工作：

I have this piece of code that does not work:

public CartaoCidadao()
{
    InitializeComponent();

    object o = WebDAV.Classes.SCWatcher.LoadAssembly();
    MethodInfo method = 
        this.GetType().GetMethod("Inserted", 
                                 BindingFlags.NonPublic | BindingFlags.Instance);

    EventInfo eventInfo = o.GetType().GetEvent("CardInserted");
    Type type = eventInfo.EventHandlerType;
    Delegate handler = Delegate.CreateDelegate(type, this , method);

    eventInfo.AddEventHandler(o, handler);
}

void Inserted(string readerName, string cardName)
{
    System.Windows.Forms.MessageBox.Show(readerName);
}

事件CardInserted存在于另一个DLL文件和对象o的载荷确定。委托处理程序后的效果值。我只是不能触发事件。

The Event CardInserted exists in another DLL file and object "o" loads OK. The delegate handler has a value after effect. I only can't fire the event.

推荐答案

下面是展示如何将事件使用反射的示例：

Here's a sample showing how to attach an event using reflection:

class Program
{
    static void Main(string[] args)
    {
        var p = new Program();
        var eventInfo = p.GetType().GetEvent("TestEvent");
        var methodInfo = p.GetType().GetMethod("TestMethod");
        Delegate handler = 
             Delegate.CreateDelegate(eventInfo.EventHandlerType, 
                                     p, 
                                     methodInfo);
        eventInfo.AddEventHandler(p, handler);

        p.Test();
    }

    public event Func<string> TestEvent;

    public string TestMethod()
    {
        return "Hello World";
    }

    public void Test()
    {
        if (TestEvent != null)
        {
            Console.WriteLine(TestEvent());
        }
    }
}

这篇关于使用反射的addEventHandler的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！