.NET 是否有内置的 EventArgs<T>? [英] Does .NET have a built-in EventArgs<T>?

问题描述

我正准备为带有单个参数的事件参数创建一个通用的 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; }
    }
}

在我这样做之前，C# 是否具有内置到该语言中的相同功能?我好像记得在 C# 2.0 出来的时候遇到过类似的东西，但现在我找不到了.

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.

或者换句话说，我是否必须创建自己的通用 EventArgs 类，或者 C# 是否提供了一个?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.您可能正在考虑 EventHandler，它允许您为任何特定类型的 EventArgs 定义委托.

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

不过，我个人并不认为 EventArgs 非常合适.用作有效载荷"的信息被用作有效载荷".在我看来，如果 args 应该是一个自定义类，以使其用法和预期属性非常清楚.使用泛型类将阻止您将有意义的名称放在适当的位置.(数据"代表什么?)

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 its 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?)

这篇关于.NET 是否有内置的 EventArgs<T>?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！