使用匿名委托时.ForEach循环;如何退出列表<串GT？ [英] How do i exit a List<string>.ForEach loop when using an anonymous delegate?

问题描述

在一个正常的循环，你可以打出来用break一个循环。可以与使用匿名委托办？

In a normal loop you can break out of a loop using break. Can the same be done using an anonymous delegate?

为例
inputString和结果都是委托外部声明。

Example inputString and result are both declared outside the delegate.

blackList.ForEach(new Action<string>(
    delegate(string item)
    {
        if(inputString.Contains(item)==true)
        {
            result = true;
            // I want to break here
        }
    }
));

编辑：
感谢您的答复，我其实在一分钟读你的书约翰:)只是为了记录我打这个问题和切换回正常foreach循环，但我张贴了这个问题，看看是否我错过了什么。

Thanks for the replies, I'm actually reading your book at the minute John :) Just for the record i hit this issue and switched back to a normal foreach loop but I posted this question to see if i missed something.

推荐答案

正如其他人发布的，你不能退出的的ForEach循环。

As others have posted, you can't exit the loop in ForEach.

您可以使用LINQ？如果是这样，你可以很容易地结合起来TakeWhile和一个自定义的ForEach扩展方法（这几乎每个项目似乎有这几天）。

Are you able to use LINQ? If so, you could easily combine TakeWhile and a custom ForEach extension method (which just about every project seems to have these days).

在你的榜样，但是，<一个HREF =htt​​p://msdn.microsoft.com/en-us/library/x1xzf2ca.aspx> 列表< T> .FindIndex 将是最好的选择 - 但如果你没有真正这样做，请发表一下你的为例真的的想要做的。

In your example, however, List<T>.FindIndex would be the best alternative - but if you're not actually doing that, please post an example of what you really want to do.

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