我如何通过反射在.net / C#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(DevEx preSS ButtonEdit控制)。我想打一个特定的按键(替代骨节病> + <大骨节病>下骨节病>)模拟点击按钮。为了避免写这个遍地,我想打一个通用KeyUp事件处理程序,将提高ButtonClick事件。不幸的是,似乎没有成为引发ButtonClick事件控制的方法,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...
我如何通过反射提高从外部函数的事件?
How do I raise the event from an external function via reflection?
推荐答案
下面是一个使用泛型(错误检查省略)一个演示:
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 eventInfo = source.GetType().GetEvent(eventName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
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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