C#如何判断ArrayList中是否包含具有特定属性的对象 [英] C# how to determine, whether ArrayList contains object with certain attribute

问题描述

我有一个自定义类的对象的 ArrayList.我想知道，如果 ArrayList 包含具有特定属性的对象.我不在乎对象，只要有一些.是的，我可以用 foreach 循环来做到这一点，但我想知道是否有更优雅的方法来做到这一点.

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

嗯，首先我建议使用 List 而不是 ArrayList.然后 LINQ to Objects 让它变得非常简单:

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(但仍然是 List)

Or without LINQ (but still List<T>)

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

如果您真的需要坚持使用非泛型集合但也需要使用 LINQ to Objects，则可以使用:

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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