#unity/日常积累

# ConcurrentQueue 类

-   参考

反馈

[](https://learn.microsoft.com/zh-cn/dotnet/api/system.collections.concurrent.concurrentqueue-1?view=net-8.0#definition)

## 定义

命名空间:

[System.Collections.Concurrent](https://learn.microsoft.com/zh-cn/dotnet/api/system.collections.concurrent?view=net-8.0)

程序集:

System.Collections.Concurrent.dll

表示线程安全的先进先出 (FIFO) 集合。

``` cs
public class ConcurrentQueue<T> : System.Collections.Concurrent.IProducerConsumerCollection<T>, System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.IReadOnlyCollection<T>, System.Collections.ICollection
```

#### 类型参数

T

队列中包含的元素的类型。

继承

[Object](https://learn.microsoft.com/zh-cn/dotnet/api/system.object?view=net-8.0)

``` cs
ConcurrentQueue<T>
```

示例

``` cs
using System;
using System.Collections.Concurrent;
using System.Threading;
using System.Threading.Tasks;

class CQ_EnqueueDequeuePeek
{
   // Demonstrates:
   // ConcurrentQueue<T>.Enqueue()
   // ConcurrentQueue<T>.TryPeek()
   // ConcurrentQueue<T>.TryDequeue()
   static void Main ()
   {
      // Construct a ConcurrentQueue.
      ConcurrentQueue<int> cq = new ConcurrentQueue<int>();

      // Populate the queue.
      for (int i = 0; i < 10000; i++)
      {
          cq.Enqueue(i);
      }

      // Peek at the first element.
      int result;
      if (!cq.TryPeek(out result))
      {
         Console.WriteLine("CQ: TryPeek failed when it should have succeeded");
      }
      else if (result != 0)
      {
         Console.WriteLine("CQ: Expected TryPeek result of 0, got {0}", result);
      }

      int outerSum = 0;
      // An action to consume the ConcurrentQueue.
      Action action = () =>
      {
         int localSum = 0;
         int localValue;
         while (cq.TryDequeue(out localValue)) localSum += localValue;
         Interlocked.Add(ref outerSum, localSum);
      };

      // Start 4 concurrent consuming actions.
      Parallel.Invoke(action, action, action, action);

      Console.WriteLine("outerSum = {0}, should be 49995000", outerSum);
   }
}
```

## 注解

 备注

[ConcurrentQueue<T>](https://learn.microsoft.com/zh-cn/dotnet/api/system.collections.concurrent.concurrentqueue-1?view=net-8.0)[IReadOnlyCollection<T>](https://learn.microsoft.com/zh-cn/dotnet/api/system.collections.generic.ireadonlycollection-1?view=net-8.0)实现从 .NET Framework 4.6 开始的接口;在.NET Framework的早期版本中，[ConcurrentQueue<T>](https://learn.microsoft.com/zh-cn/dotnet/api/system.collections.concurrent.concurrentqueue-1?view=net-8.0)类未实现此接口。