DefaultMemberAttribute - 它有什么作用? [英] DefaultMemberAttribute - what does it do?

问题描述

我已经阅读了有关它的 MSDN 文章.在内部，它似乎是 c# 设置将作为索引器工作的函数的方式(我对吗?).现在，我看到了以下示例:

I've already read the MSDN article about it. It seems internally it is the way c# sets which is the function that is going to work as indexer(am I right?). Now, I've seen the following example:

[DefaultMemberAttribute("Main")]
public class Program {

    public static void Main() {
        ...
    }
}

现在，我不明白这是什么意思.

Now, I don't get it what it means.

谢谢大家.但是除了索引器之外，我仍然无法得到它的用处.我们什么时候调用 InvokeMember?

Thanks all. But I still can't get its usefulness, apart from the indexer thing. When are we going to call InvokeMember?

推荐答案

我个人没用过，但据我所知，你定义的是调用 InvokeMember.所以，如果我要说的话，使用你提供的代码片段:

I personally have never used it, but as far as I can tell you are defining the default method to be invoked when calling InvokeMember. So, using the code snippet you provided if I was to say:

Program prog = new Program();
typeof(Program).InvokeMember("", null, null, prog, null);

因为我将 InvokeMember 调用的第一个参数留空，它将使用该属性来确定您的类的默认成员是什么，在您的情况下它是 Main.

Because I left the first argument empty of the InvokeMember call it would use the attribute to determine what the default member is of your class, in your case it is Main.

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