C＃如何判断，ArrayList中是否包含某些属性对象 [英] C# how to determine, whether ArrayList contains object with certain attribute

问题描述

我有我的自定义类的对象的ArrayList。我想知道，如果ArrayList包含某些属性的对象。我不关心的对象，只是如果有一些。是的，我可以用foreach循环做到这一点，但我想知道是否有更优雅的方式这样做。

I have an ArrayList of objects of my custom class. I would like to know, if ArrayList contains object with certain attribute. I do not care about the object, just if there is some. Yes, I could do this with foreach cycle, but I was wondering if there was more elegant way to do so.

感谢您的建议。

推荐答案

好了，开始跟我建议使用列表＆LT; T＆GT; 而不是的ArrayList 。然后，LINQ到对象变得非常简单：

Well, to start with I'd suggest using List<T> instead of ArrayList. Then LINQ to Objects makes it really easy:

if (list.Any(x => x.HasFoo))
{
}

或者没有LINQ（但仍列表＆LT; T＆GT; ）

if (list.FindIndex(x => x.HasFoo) != -1)
{
}

如果您的真正的需要坚持与非泛型集合，但有LINQ到可用的对象太多，你可以使用：

If you really need to stick with a non-generic collection but have LINQ to Objects available too, you can use:

if (arrayList.Cast<YourType>().Any(x => x.HasFoo))
{
}

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