正在删除 Amazon SQS 队列 - 适用于 .NET 的 AWS 开发工具包
AWS 文档中描述的 AWS 服务或功能可能因区域而异。要查看适用于中国区域的差异,请参阅中国的 AWS 服务入门

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。

正在删除 Amazon SQS 队列

此示例向您展示如何使用 适用于 .NET 的 AWS 开发工具包 删除一个 Amazon SQS 队列。应用程序将删除队列,等待队列消失的指定时间,然后显示剩余队列的列表。

如果您没有提供任何命令行参数,应用程序只需显示现有队列的列表。

以下部分提供了此示例的片段。的 示例的完整代码 之后显示,并且可以按原样构建和运行。

删除队列

以下代码段删除由给定队列URL标识的队列。

示例 在本主题结束时 显示此片段正在使用。

// // 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

以下片段等待删除过程完成,这可能需要60秒。

示例 在本主题结束时 显示此片段正在使用。

// // 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

以下代码段显示了SQS客户端区域中现有队列的列表。

示例 在本主题结束时 显示此片段正在使用。

// // 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

本节显示此示例的相关参考和完整代码。

NuGet 程序包:

编程元素:

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

  • DeleteQueueAsync API调用不会检查您正在删除的队列是否被用作死字母队列。可以检查此的更复杂的过程。