创建自定义事件字典

• 下载源代码文件和演示项目 - 8.26 KB

引言

这个集合允许开发者从中心化的来源调用任意数量的事件。

使用代码

只需像实例化常规的 Dictionary 类一样实例化 EventDictionary 类，并使用 EventDictionary.Add 方法传入一个 EventHandler。

using System;
using System.Collections.Generic;

/// <summary>
/// Represents a collection of key/event pairs that are accessible by the 
/// event name.
/// </summary>
public class EventDictionary : Dictionary<string, EventHandler>
{
    ...

    /// <summary>
    /// Adds an entry with the specified value into the EventDictionary 
    /// collection with the EventHandler's name as the key. 
    /// </summary>
    /// <param name="e">The value of the event to add. This value cannot 
    /// be null (Nothing in Visual Basic).</param>
    public void Add(EventHandler e)
    {
        if (e == null)
            throw new ArgumentException("Event Handler cannot be null.", 
                "e");
        string s = e.Target.GetType().GetEvents()[0].ToString();
        base.Add(s.Substring(s.LastIndexOf(" ") + 1), e);
    }
}