如何检查队列是否为空?

In C#, how can I check if a Queue is empty?

在c#中，如何检查队列是否为空?

I want to iterate through the Queue's elements, and I need to know when to stop. How can I accomplish this?

我想遍历队列的元素，我需要知道何时停止。我怎样才能做到这一点呢?

6 个解决方案

#1

Assuming you mean Queue<T> you could just use:

假设您的意思是队列，您可以使用:

if (queue.Count != 0)

But why bother? Just iterate over it anyway, and if it's empty you'll never get into the body:

但何苦呢?不管怎样，只要重复一遍，如果它是空的，你就永远不会进入身体:

Queue<string> queue = new Queue<string>();

// It's fine to use foreach...
foreach (string x in queue)
{
    // We just won't get in here...
}

#2

I would suggest using the Any() method, as this will not do a count on the entire queue, which will be better in terms of performance.

我建议使用Any()方法，因为这不会对整个队列进行计数，这在性能方面会更好。

Queue myQueue = new Queue();
    if(myQueue.Any()){
      //queue not empty
    }

#3

Assuming you meant System.Collections.Generic.Queue<T>

假设你是System.Collections.Generic.Queue < T >

if(yourQueue.Count != 0) { /* Whatever */ }

should do the trick.

应该足够了。

#4

    Queue test = new Queue();
    if(test.Count > 0){
      //queue not empty
    }

#5

There is an extension method .Count() that is available because Queue implements IEnumerable.

有一个扩展方法. count()可用，因为队列实现了IEnumerable。

You can also do _queue.Any() to see if there are any elements in it.

您还可以执行_queue.Any()来查看其中是否有任何元素。

#6

You can check if its Count property equals 0.

您可以检查它的Count属性是否等于0。

#1