[英]Value cannot be null. Parameter name: messageId
我正在嘗試使用以下代碼更新Azure隊列的內容:
queue.UpdateMessage(new CloudQueueMessage(timestamp + "|" + encodedContent),TimeSpan.FromMinutes(0),MessageUpdateFields.Content, null, null);
但是,我不斷收到以下錯誤“值不能為空。參數名稱:messageId”。 嘗試通過互聯網進行搜索,但找不到任何人遇到此問題。
注意:我必須使用Azure Queue。
要更新消息,您需要先獲取特定消息,而不是創建新消息。
有關更多詳細信息,請更改排隊消息的內容
更新:
您可以將消息ID和PopReceipt傳遞給您的方法:
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();
}
對於您的情況,假設您已經知道消息ID,則可以通過ID更新消息。
我們需要使用消息ID遍歷所有隊列消息,以獲取要更新的正確消息。
如下代碼:
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();
}
}
}
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