获取事件的编译器生成的委托 | 获取事件的编译器生成的委托

本文介绍了获取事件的编译器生成的委托的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我需要知道ObservableCollection类的CollectionChanged事件包含哪些处理程序.我发现的唯一解决方案是在事件的委托上使用Delegate.GetInvocationList().问题是，我无法通过反射找到编译器生成的委托.AFAIK委托与事件具有相同的名称.我使用了以下代码:

I need to know what handlers are subsribed to the CollectionChanged event of the ObservableCollection class. The only solution I found would be to use Delegate.GetInvocationList() on the delegate of the event. The problem is, I can't get Reflection to find the compiler generated delegate. AFAIK the delegate has the same name as the event. I used the following piece of code:

PropertyInfo notifyCollectionChangedDelegate = collection.GetType().GetProperty("CollectionChanged", BindingFlags.Instance | BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy);

推荐答案

它不是属性，而是字段.这有效:

It is not a property, it is a field. This works:

using System;
using System.Collections.ObjectModel;  // Add reference to WindowsBase
using System.Collections.Specialized;
using System.Reflection;

namespace ConsoleApplication1 {
  class Program {
    static void Main(string[] args) {
      var coll = new ObservableCollection<int>();
      coll.CollectionChanged += coll_CollectionChanged;
      coll.Add(42);
      FieldInfo fi = coll.GetType().GetField("CollectionChanged", BindingFlags.NonPublic | BindingFlags.Instance);
      NotifyCollectionChangedEventHandler handler = fi.GetValue(coll) as NotifyCollectionChangedEventHandler;
      handler.Invoke(coll, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
    }

    static void coll_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e) {
      Console.WriteLine("Changed {0}", e.Action);
    }
  }
}

不要使用它.

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