CODEWITHSUNDEEP
c#azureazure-functionsserverless
TutuGeorge
TutuGeorge

Reputation: 2022

Azure function with additional input data parameter binding

I am trying to create an Azure Function with a ServiceBus Queue trigger and an additional input data. That is the function should trigger on blob update giving the blob name as input. I want to have a Blob data as an additional input.

The function.json created is as below. 

{
  "bindings": [
    {
      "name": "myQueueItem",
      "type": "serviceBusTrigger",
      "direction": "in",
      "queueName": "afqueue",
      "connection": "CONNECTIONSTRING",
      "accessRights": "Listen"
    },
    {
      "type": "blob",
      "name": "inputBlob",
      "path": "samplecontainer/{name}",
      "connection": "AzureWebJobsDashboard",
      "direction": "in"
    }
  ],
  "disabled": false
}

The function signature defined is as follows.

public static void Run(string myQueueItem, Stream inputBlob, TraceWriter log){}

This gives an error as below

Function ($ServiceBusQueueTriggerCSharp1) Error: Microsoft.Azure.WebJobs.Host: Error indexing method 'Functions.ServiceBusQueueTriggerCSharp1'. Microsoft.Azure.WebJobs.Host: No binding parameter exists for 'name'.

Instead of paramter {name}, if a hardcoded value is given the function is working properly. How to do the binding to input data variable.

Upvotes: 0

Views: 1863

Answers (1)

Mikhail Shilkov
Mikhail Shilkov

Reputation: 35144

Input binding can be templated from trigger parameters. So, name should be part of your service bus message payload. You could implement the function like this:

public class MyQueueItem
{
    public string name { get; set; }
}

public static void Run(MyQueueItem myQueueItem, Stream inputBlob, TraceWriter log)
{}

Note that the only trigger for this function are Service Bus messages. The function will NOT be triggered by blob updates, unless some other code of yours sends a Service Bus message with blob name for each update in the system.

Upvotes: 1

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