值不能为空。 参数名称：messageId

Question

I'm trying to update the content of an Azure Queue using the following code :

queue.UpdateMessage(new CloudQueueMessage(timestamp + "|" + encodedContent),TimeSpan.FromMinutes(0),MessageUpdateFields.Content, null, null);

However, I keep getting the following error "Value cannot be null. Parameter name: messageId". Tried searching through the internet but couldn't find anyone having this issue.

Note: It's mandatory for me to use Azure Queue.

Answer 1

To update a message, you need to get the specific message first instead of creating a new message.

For more details Change the contents of a queued message

Answer 2

Update:

You can pass message id and PopReceipt to your method:

        static void Main(string[] args)
        {

           CloudStorageAccount storageAccount = CloudStorageAccount.Parse(                
                     CloudConfigurationManager.GetSetting("StorageConnectionString"));

           // Create the queue client.
           CloudQueueClient queueClient = storageAccount.CreateCloudQueueClient();

           // Retrieve a reference to a container.
           CloudQueue queue = queueClient.GetQueueReference("myqueue0905");

           //Retrieve the cached approximate message count.
           queue.FetchAttributes();
           int? cachedMessageCount = queue.ApproximateMessageCount;

           //get the message id and PopReceipt, or you can pass them from your api call.
           string _id = "";
           string _popreceipt = "";

           if (cachedMessageCount != null)
           {

            foreach (CloudQueueMessage message in queue.GetMessages(cachedMessageCount.Value, TimeSpan.FromMinutes(3)))
            {
                 _id = message.Id;
                 _popreceipt = message.PopReceipt;

                 Console.WriteLine("the id is:" + _id);
                 Console.WriteLine("the pop receipt is:" + _popreceipt);

             }

            }

          //update queue message by using message id and PopReceipt
          var msg = new CloudQueueMessage(_id, _popreceipt);
          msg.SetMessageContent("a test messge 123456");
          queue.UpdateMessage(msg, TimeSpan.FromSeconds(120.0),
                            MessageUpdateFields.Content | MessageUpdateFields.Visibility);            

          Console.WriteLine("complete update");
          Console.ReadLine();
       }

In your case, assume you already know the message id, then you can update your message via the id.

We need to iterate all the queue messages using the message id, to fetch the correct message you want to update.

Code like below:

using Microsoft.Azure;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Queue;
using System;

namespace ConsoleApp11
{
    class Program
    {
        static void Main(string[] args)
        {
            //assume you know the message id
            string message_id = "3798f6b6-1541-4421-b8de-79a8294edf49";

            CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
    CloudConfigurationManager.GetSetting("StorageConnectionString"));

            // Create the queue client.
            CloudQueueClient queueClient = storageAccount.CreateCloudQueueClient();

            // Retrieve a reference to a container.
            CloudQueue queue = queueClient.GetQueueReference("myqueue0905");

            //Retrieve the cached approximate message count.
            queue.FetchAttributes();
            int? cachedMessageCount = queue.ApproximateMessageCount;

            //if the queue is not null
            if (cachedMessageCount != null)
            {

                foreach (CloudQueueMessage message in queue.GetMessages(cachedMessageCount.Value))
                {
                    if (message.Id == message_id)
                    {
                        message.SetMessageContent("test updated content again");
                        queue.UpdateMessage(message, TimeSpan.FromSeconds(5.0),
                            MessageUpdateFields.Content | MessageUpdateFields.Visibility);
                    }
                }

            }

            Console.ReadLine();
        }

    }
}