.NET是否有一个内置的EventArgs＆LT; T＆GT ;? [英] Does .NET have a built-in EventArgs<T>?

问题描述

我准备创建携带一个参数事件参数的通用EventArgs类：

I am getting ready to create a generic EventArgs class for event args that carry a single argument:

public class EventArg<T> : EventArgs
{
    // Property variable
    private readonly T p_EventData;

    // Constructor
    public EventArg(T data)
    {
        p_EventData = data;
    }

    // Property for EventArgs argument
    public T Data
    {
        get { return p_EventData; }
    }
}

我这样做之前，C＃有内置的语言相同的功能？我似乎记得跨类似的东西来当C＃2.0出来了，但现在我找不到它。

Before I do that, does C# have the same feature built in to the language? I seem to recall coming across something like that when C# 2.0 came out, but now I can't find it.

或者换一种说法，我必须创建自己的通用EventArgs类，还是C＃提供一个？感谢您的帮助。

Or to put it another way, do I have to create my own generic EventArgs class, or does C# provide one? Thanks for your help.

推荐答案

没有。你可能在想的<一个href=\"http://msdn.microsoft.com/en-us/library/db0etb8x%28VS.85%29.aspx\"><$c$c>EventHandler<T>,它允许您定义委托任何特定的EventArgs类型。

No. You probably were thinking of EventHandler<T>, which allows you to define the delegate for any specific type of EventArgs.

我个人不觉得 EventArgs的＆LT; T＆GT; 是那么好一个合适的，虽然。用作事件参数一个有效载荷的信息应该是，在我看来，一个自定义类，使它的使用和预期性质非常清楚。使用泛型类将prevent你能够把有意义的名称到位。 （什么是数据重present？）

I personally don't feel that EventArgs<T> is quite as good of a fit, though. The information used as a "payload" in the event args should be, in my opinion, a custom class to make it's usage and expected properties very clear. Using a generic class will prevent you from being able to put meaningful names into place. (What does "Data" represent?)

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