通过名称获取EventHandler? [英] Get EventHandler by name?

问题描述

如果还有另一个问题可以解释这一点，我为找不到它而表示歉意，但我认为这可能与我不熟悉与我尝试做的事情有关的某些术语有关.

if there is another question that explains this I apologize for not being able to find it, but I think it might have to do with my unfamiliarity with some of the terms involved with what I'm trying to do.

我想做的是按名称向按钮添加事件处理程序.因此，例如，在下面的代码中，我不知道要添加showInfo，而是可以通过名称(字符串)(例如"showInfo")引用EventHandler吗?

What I'm trying to do is to add an eventhandler to a button by name. So for example, in the code below instead of knowing that I want to add showInfo, can I reference the EventHandler by name (string) like "showInfo"?

myButton.Click += new EventHandler(showInfo);

void showInfo(object sender, EventArgs e)
{
    // ..
}

推荐答案

您可以通过反射从方法创建委托，然后通过反射将其订阅到事件，是的.示例代码:

You can create a delegate from a method via reflection, and then subscribe that to the event via reflection, yes. Sample code:

using System;
using System.Reflection;

class Publisher
{
    public event EventHandler Foo;

    public void RaiseFoo()
    {
        EventHandler handler = Foo;
        if (handler != null)
        {
            handler(this, EventArgs.Empty);
        }
    }
}

class Subscriber
{
    public void HandleEvent(object sender, EventArgs e)
    {
        Console.WriteLine("In HandleEvent");
    }
}

class Test
{
    static void Main()
    {
        var subscriber = new Subscriber();
        var publisher = new Publisher();

        var methodInfo = typeof(Subscriber).GetMethod("HandleEvent");
        var handler = (EventHandler) Delegate.CreateDelegate(
               typeof(EventHandler), subscriber, methodInfo);

        var eventInfo = typeof(Publisher).GetEvent("Foo");
        eventInfo.AddEventHandler(publisher, handler);

        publisher.RaiseFoo();
    }    
}

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