适用于 .NET 的 AWS SDK V3 已进入维护模式。

我们建议您迁移到 [适用于 .NET 的 AWS SDK V4](https://docs.aws.amazon.com/sdk-for-net/v4/developer-guide/welcome.html)。有关如何迁移的更多详细信息和信息，请参阅我们的[维护模式公告](https://aws.amazon.com/blogs/developer/aws-sdk-for-net-v3-maintenance-mode-announcement/)。

本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。

# 删除 Amazon SQS 队列
<a name="DeleteSqsQueue"></a>

此示例向您展示如何使用删除 Amazon SQS 队列。 适用于 .NET 的 AWS SDK 应用程序删除队列，等到队列消失，然后显示剩余队列的列表。

如果您不提供任何命令行参数，则应用程序仅显示现有队列的列表。

以下各节提供了此示例的片段。此后显示了[该示例的完整代码](#DeleteSqsQueue-complete-code)，并且可以按原样构建和运行。

**Topics**
+ [删除队列](#DeleteSqsQueue-delete-queue)
+ [等待队列消失](#DeleteSqsQueue-wait)
+ [显示现有队列的列表](#DeleteSqsQueue-list-queues)
+ [完整代码](#DeleteSqsQueue-complete-code)
+ [其他注意事项](#DeleteSqsQueue-additional)

## 删除队列
<a name="DeleteSqsQueue-delete-queue"></a>

以下代码片段删除了由给定队列 URL 标识的队列。

[本主题末尾](#DeleteSqsQueue-complete-code)的示例显示了此片段的使用情况。

```
    //
    // Method to delete an SQS queue
    private static async Task DeleteQueue(IAmazonSQS sqsClient, string qUrl)
    {
      Console.WriteLine($"Deleting queue {qUrl}...");
      await sqsClient.DeleteQueueAsync(qUrl);
      Console.WriteLine($"Queue {qUrl} has been deleted.");
    }
```

## 等待队列消失
<a name="DeleteSqsQueue-wait"></a>

以下代码片段等待删除过程完成，这可能需要 60 秒。

[本主题末尾](#DeleteSqsQueue-complete-code)的示例显示了此片段的使用情况。

```
    //
    // Method to wait up to a given number of seconds
    private static async Task Wait(
      IAmazonSQS sqsClient, int numSeconds, string qUrl)
    {
      Console.WriteLine($"Waiting for up to {numSeconds} seconds.");
      Console.WriteLine("Press any key to stop waiting. (Response might be slightly delayed.)");
      for(int i=0; i<numSeconds; i++)
      {
        Console.Write(".");
        Thread.Sleep(1000);
        if(Console.KeyAvailable) break;

        // Check to see if the queue is gone yet
        var found = false;
        ListQueuesResponse responseList = await sqsClient.ListQueuesAsync("");
        foreach(var url in responseList.QueueUrls)
        {
          if(url == qUrl)
          {
            found = true;
            break;
          }
        }
        if(!found) break;
      }
    }
```

## 显示现有队列的列表
<a name="DeleteSqsQueue-list-queues"></a>

以下代码片段显示了 SQS 客户端区域中现有队列的列表。

[本主题末尾](#DeleteSqsQueue-complete-code)的示例显示了此片段的使用情况。

```
    //
    // Method to show a list of the existing queues
    private static async Task ListQueues(IAmazonSQS sqsClient)
    {
      ListQueuesResponse responseList = await sqsClient.ListQueuesAsync("");
      Console.WriteLine("\nList of queues:");
      foreach(var qUrl in responseList.QueueUrls)
        Console.WriteLine($"- {qUrl}");
    }
```

## 完整代码
<a name="DeleteSqsQueue-complete-code"></a>

本部分显示了本示例的相关参考和完整代码。

### SDK 参考
<a name="w2aac19c15c25c21c25b5b1"></a>

NuGet 包裹：
+ [AWSSDK.SQS](https://www.nuget.org/packages/AWSSDK.SQS)

编程元素：
+ 命名空间 [Amazon.SQS](https://docs.aws.amazon.com/sdkfornet/v3/apidocs/items/SQS/NSQS.html)

  [Amazon 上](https://docs.aws.amazon.com/sdkfornet/v3/apidocs/items/SQS/TSQSClient.html)课 SQSClient
+ 命名空间 [Amazon.SQS.Model](https://docs.aws.amazon.com/sdkfornet/v3/apidocs/items/SQS/NSQSModel.html)

  班级 [ListQueuesResponse](https://docs.aws.amazon.com/sdkfornet/v3/apidocs/items/SQS/TListQueuesResponse.html)

### 代码
<a name="w2aac19c15c25c21c25b7b1"></a>

```
using System;
using System.Threading;
using System.Threading.Tasks;
using Amazon.SQS;
using Amazon.SQS.Model;

namespace SQSDeleteQueue
{
  // = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
  // Class to update a queue
  class Program
  {
    private const int TimeToWait = 60;

    static async Task Main(string[] args)
    {
      // Create the Amazon SQS client
      var sqsClient = new AmazonSQSClient();

      // If no command-line arguments, just show a list of the queues
      if(args.Length == 0)
      {
        Console.WriteLine("\nUsage: SQSCreateQueue queue_url");
        Console.WriteLine("   queue_url - The URL of the queue you want to delete.");
        Console.WriteLine("\nNo arguments specified.");
        Console.Write("Do you want to see a list of the existing queues? ((y) or n): ");
        var response = Console.ReadLine();
        if((string.IsNullOrEmpty(response)) || (response.ToLower() == "y"))
          await ListQueues(sqsClient);
        return;
      }

      // If given a queue URL, delete that queue
      if(args[0].StartsWith("https://sqs."))
      {
        // Delete the queue
        await DeleteQueue(sqsClient, args[0]);
        // Wait for a little while because it takes a while for the queue to disappear
        await Wait(sqsClient, TimeToWait, args[0]);
        // Show a list of the remaining queues
        await ListQueues(sqsClient);
      }
      else
      {
        Console.WriteLine("The command-line argument isn't a queue URL:");
        Console.WriteLine($"{args[0]}");
      }
    }


    //
    // Method to delete an SQS queue
    private static async Task DeleteQueue(IAmazonSQS sqsClient, string qUrl)
    {
      Console.WriteLine($"Deleting queue {qUrl}...");
      await sqsClient.DeleteQueueAsync(qUrl);
      Console.WriteLine($"Queue {qUrl} has been deleted.");
    }


    //
    // Method to wait up to a given number of seconds
    private static async Task Wait(
      IAmazonSQS sqsClient, int numSeconds, string qUrl)
    {
      Console.WriteLine($"Waiting for up to {numSeconds} seconds.");
      Console.WriteLine("Press any key to stop waiting. (Response might be slightly delayed.)");
      for(int i=0; i<numSeconds; i++)
      {
        Console.Write(".");
        Thread.Sleep(1000);
        if(Console.KeyAvailable) break;

        // Check to see if the queue is gone yet
        var found = false;
        ListQueuesResponse responseList = await sqsClient.ListQueuesAsync("");
        foreach(var url in responseList.QueueUrls)
        {
          if(url == qUrl)
          {
            found = true;
            break;
          }
        }
        if(!found) break;
      }
    }


    //
    // Method to show a list of the existing queues
    private static async Task ListQueues(IAmazonSQS sqsClient)
    {
      ListQueuesResponse responseList = await sqsClient.ListQueuesAsync("");
      Console.WriteLine("\nList of queues:");
      foreach(var qUrl in responseList.QueueUrls)
        Console.WriteLine($"- {qUrl}");
    }
  }
}
```

## 其他注意事项
<a name="DeleteSqsQueue-additional"></a>
+ `DeleteQueueAsync` API 调用不会检查您要删除的队列是否被用作死信队列。可以用更复杂的程序来检查这一点。
+ 您还可以在 [Amazon SQS 控制台](https://console.aws.amazon.com/sqs)中查看队列列表和此示例的结果。