如何通过.NET / C＃中的反射来引发事件？ [英] How do I raise an event via reflection in .NET/C#?

问题描述

我有一个第三方编辑器，基本上包含一个文本框和一个按钮（DevExpress ButtonEdit控件）。我想做一个特定的击键（ Alt + Down ）模拟单击按钮。为了避免一遍又一遍的写入，我想制作一个通用的KeyUp事件处理程序，它会引发ButtonClick事件。不幸的是，控件中似乎没有一个引发ButtonClick事件的方法，所以...

I have a third-party editor that basically comprises a textbox and a button (the DevExpress ButtonEdit control). I want to make a particular keystroke (Alt + Down) emulate clicking the button. In order to avoid writing this over and over, I want to make a generic KeyUp event handler that will raise the ButtonClick event. Unfortunately, there doesn't seem to be a method in the control that raises the ButtonClick event, so...

如何通过外部函数提高事件反思？

How do I raise the event from an external function via reflection?

推荐答案

这是一个使用泛型（一个错误检查略）的演示：

Here's a demo using generics (error checks omitted):

using System;
using System.Reflection;
static class Program {
  private class Sub {
    public event EventHandler<EventArgs> SomethingHappening;
  }
  internal static void Raise<TEventArgs>(this object source, string eventName, TEventArgs eventArgs) where TEventArgs : EventArgs
  {
    var eventDelegate = (MulticastDelegate)source.GetType().GetField(eventName, BindingFlags.Instance | BindingFlags.NonPublic).GetValue(source);
    if (eventDelegate != null)
    {
      foreach (var handler in eventDelegate.GetInvocationList())
      {
        handler.Method.Invoke(handler.Target, new object[] { source, eventArgs });
      }
    }
  }
  public static void Main()
  {
    var p = new Sub();
    p.Raise("SomethingHappening", EventArgs.Empty);
    p.SomethingHappening += (o, e) => Console.WriteLine("Foo!");
    p.Raise("SomethingHappening", EventArgs.Empty);
    p.SomethingHappening += (o, e) => Console.WriteLine("Bar!");
    p.Raise("SomethingHappening", EventArgs.Empty);
    Console.ReadLine();
  }
}

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