How to change function app trigger type after creation?

Question

So, I have a function app with http trigger, with the following settings

function.json

{
"bindings": [
{
"authLevel": "function",
"type": "httpTrigger",
"direction": "in",
"name": "req",
"methods": [
"get",
"post"
]
},
{
"type": "http",
"direction": "out",
"name": "res"
}
]
}

Now, I want to change the trigger type to queue, I update the settings as such:

{
"type": "queueTrigger",
"direction": "in",
"name": "queueItem",
"queueName": "adreporterqueue",
"connection":"QueueConnectionString"
}

I published the function. But the trigger type is still http. How to change it to queue?

Answer 1

Hello @Amit Maharjan

Changing of function app trigger type after creation is not supported
There is a workaround - Define multiple function triggers within one function project and bound them to different targets. Trigger type control can be managed via the App Service Application Settings.
Example:

public static class Functions  
{  
    [FunctionName("FunctionTimer")]  
    public static async Task RunAsync([TimerTrigger("%Schedule%")]TimerInfo myTimer, ILogger log)  
    {  
        if (!AppSettings.IsTimerTriggerActive)   
            return;  
        ...  
    }  
  
    [FunctionName("FunctionEventHub")]  
    public static async Task RunAsync([EventHubTrigger("", Connection = "eventHubConnectionString")] EventData[] eventDataBatch, ILogger log)  
    {  
        if (!AppSettings.IsEventHubTriggerActive)   
            return;  
        ...  
    }  
}  

https://stackoverflow.com/questions/50939889/is-there-a-way-to-change-the-azure-function-trigger-type-programmatically