C# Service Bus Queue trigger never gets triggered

Question

I've created an really simple .net core 3.1 functions project with an function that should be triggered based on an service bus queue.

Code looks like this:

[FunctionName("PublishImage")]
public static async Task Run(
    [QueueTrigger("publishimage")]string message,
    ILogger log)
{
    log.LogInformation($"Started to publish image: {message}");
}

When i start the function locally i see that he finds the function and i don't get any exception.

Then when i send a message to the queue. It doesn't get triggered. In Azure i see that there are now 4 message in the queue and what ever i do it doesn't get triggered, see no exceptions locally and if i try to run it in Azure with application Insights enabled i don't see any exception or any information. Also turning logging on doesn't give any information.

My host.json now looks like this:

{
    "version": "2.0",
    "functionTimeout": "04:00:00",
    "extensions": {
        "queues": {
            "maxPollingInterval": "00:00:02",
            "visibilityTimeout": "00:00:30",
            "batchSize": 16,
            "maxDequeueCount": 5,
            "newBatchThreshold": 8
        }
    }
}

• Microsoft.NET.Sdk.Functions 3.0.7 is installed.
• Runtime in azure is ~3
• The app setting AzureWebJobsServiceBus is set and verified

Answer 1

I've found the solution. I was using an Service Bus queue. Therefor i should not use the QueueTrigger but the ServiceBusTrigger. Changing the code to following fixed the problem:

[FunctionName("PublishImage")]
public static async Task Run(
    [ServiceBusTrigger("publishimage")]string message,
    ILogger log)
{
    log.LogInformation($"Started to publish image: {message}");
}