如何通过 .NET/C# 中的反射引发事件? [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，它基本上包含一个文本框和一个按钮(DevExpress ButtonEdit 控件).我想让特定的击键 (Alt + Down) 模拟单击​​按钮.为了避免一遍又一遍地写这个，我想制作一个通用的 KeyUp 事件处理程序，它将引发 ButtonClick 事件.不幸的是，控件中似乎没有引发 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...

如何通过反射从外部函数引发事件?

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

推荐答案

这是一个使用泛型的演示(省略了错误检查):

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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