如何在隔离的 Azure 函数 v4 中获取消息元数据 - c# 中的队列触发器

Question

I am following on a possible upgrade of azure function runtime from v3 to v4 with do.net. While doing so, I am testing out the isolated option for the project. However I am unable to get message metadata such as DequeueCount, MessageId etc in the queue trigger.

Previously with in-process option, I used to bind CloudQueueMessage but that doesn't seem to work in the isolated mode. Doing so, throws and error -

Cannot convert input parameter 'myQueueItem' to type 'Microsoft.WindowsAzure.Storage.Queue.CloudQueueMessage' from type 'System.String'

This was my isolated queue function binding

[Function("TestApp")]
public void Run([QueueTrigger("sample-queue", Connection = "")] CloudQueueMessage myQueueItem, FunctionContext context)

After looking for a while, I think here it says that, in isolated process we can only bind string. Simple JSON - Object also works.

Is there any way to get these message metadata (members of the CloudQueueMessage ) in the isolated azure function? Thanks.

Answer 1

For DequeueCount property I use this:

[Function("MyQueueTrigger")]
public void Run([QueueTrigger("my-queue-name")] string myQueueItem, int dequeueCount)
{
    _logger.LogInformation("Queue item: {item}. Dequeue count: {dequeueCount}.", myQueueItem, dequeueCount);
}