无法从Azure服务总线队列接收工作程序服务中的消息

问题描述

尝试实现Azure队列中的消息的使用者/接收者。我正在使用工作人员服务/后台服务项目 .Net core 3.1 。

以下是Program.cs

 public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureServices((hostContext,services) =>
        {
            services.AddSingleton<IQueueClient>(x => new QueueClient(hostContext.Configuration.GetConnectionString("ServiceBusConnectionString") ?? hostContext.Configuration["ServiceBusConnectionString"],hostContext.Configuration.GetValue<string>("QueueName")));
            services.AddHostedService<WorkerService>();
        });

以下是工作人员服务。cs

public class WorkerService : BackgroundService
{
    private readonly IQueueClient queueClient;
    private readonly ILogger<PolCommunicationRequestQueueServiceBusSubscriber> logger;

    public WorkerService(IQueueClient queueClient,ILogger<WorkerService> logger)
    {
        this.queueClient = queueClient;
        this.logger = logger;
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        try
        {
            queueClient.RegisterMessageHandler(ProcessMessagesAsync,new MessageHandlerOptions(ExceptionReceivedHandler)
            {
                MaxConcurrentCalls = 1,AutoComplete = false
            });
        }
        catch (Exception ex)
        {
            logger.LogError(ex.Message);
        }
        finally
        {
            await queueClient.CloseAsync();
        }
    }

    public async Task ProcessMessagesAsync(Message message,CancellationToken token)
    {
        // Process the message
        logger.LogInformation($"Received message: SequenceNumber:{message.SystemProperties.SequenceNumber} Body:{Encoding.UTF8.GetString(message.Body)}");
        await queueClient.CompleteAsync(message.SystemProperties.LockToken);
    }

    public Task ExceptionReceivedHandler(ExceptionReceivedEventArgs exceptionReceivedEventArgs)
    {
        logger.LogError($"Message handler encountered an exception {exceptionReceivedEventArgs.Exception}.");
        return Task.CompletedTask;
    }
  }
}

但是该方法的一种变体可以工作，但会引发错误“ 消息处理程序已经注册。”

while (!stoppingToken.IsCancellationRequested)
{
    queueClient.RegisterMessageHandler((Message message,CancellationToken cancellationToken) =>
    {
        logger.LogInformation($"Received message: SequenceNumber:{message.SystemProperties.SequenceNumber} Body:{Encoding.UTF8.GetString(message.Body)}");

                    //Implement DB/other logic here
        return queueClient.CompleteAsync(message.SystemProperties.LockToken);
    },new MessageHandlerOptions(ExceptionReceivedHandler)
        {
            MaxConcurrentCalls = 1,AutoComplete = false
        });

    logger.LogInformation("Worker running at: {time}",DateTimeOffset.Now);

    await Task.Delay(1000,stoppingToken);
}

当我在控制台项目中实现它时，它可以工作。 不知道这里缺少什么。

解决方法

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