Isolated Azure functions failed to access Azure Service Bus

Question

My Isolated Azure funtion is accessing Azure Service Bus. The Function App is working locally.

[Function("Function1")]
public async Task Run([ServiceBusTrigger("email", Connection = "AzureServiceBus:ConnectionString")] string myQueueItem, CancellationToken cancellationToken)        
    {
    }

Where appsettings.json has

"AzureServiceBus": {
    "ConnectionString": "Endpoint=sb://"
  }

Package Microsoft.Azure.Functions.Worker.Extensions.ServiceBus (5.11) is used for isolated model.

Program:

var host = new HostBuilder()
    .ConfigureFunctionsWorkerDefaults()
    .ConfigureAppConfiguration(builder =>
    {
        builder.AddJsonFile("local.settings.json");
        builder.AddJsonFile("appsettings.json");
        builder.AddUserSecrets<Program>();
    })    
    .ConfigureServices((context, services) => 
    {                
        services.Configure<AzureServiceBus>(context.Configuration.GetSection("AzureServiceBus"));
    })
    .Build();

host.Run();

However the Function App is not working on Azure infrastructure. The error:

The listener for function 'Functions.Function1' was unable to start. Service Bus account connection string 'AzureServiceBus:ConnectionString' does not exist. Make sure that it is a defined App Setting. Microsoft.Azure.WebJobs.Extensions.ServiceBus.Config.ServiceBusClientFactory.ResolveConnectionInformation

Not sure why Microsoft.Azure.WebJobs.Extensions.ServiceBus has been used here?

Microsoft.Azure.WebJobs.Host.Listeners.FunctionListenerException:
System.InvalidOperationException:
   at Microsoft.Azure.WebJobs.Extensions.ServiceBus.Config.ServiceBusClientFactory.ResolveConnectionInformation (Microsoft.Azure.WebJobs.Extensions.ServiceBus, Version=5.11.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at Microsoft.Azure.WebJobs.Extensions.ServiceBus.Config.ServiceBusClientFactory.CreateClientFromSetting (Microsoft.Azure.WebJobs.Extensions.ServiceBus, Version=5.11.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Lazy`1.ViaFactory (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Lazy`1.ExecutionAndPublication (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Lazy`1.CreateValue (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.ServiceBus.Listeners.ServiceBusListener+<>c__DisplayClass33_0.<.ctor>b__2 (Microsoft.Azure.WebJobs.Extensions.ServiceBus, Version=5.11.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Lazy`1.ViaFactory (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Lazy`1.CreateValue (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.ServiceBus.Listeners.ServiceBusListener+<StartAsync>d__34.MoveNext (Microsoft.Azure.WebJobs.Extensions.ServiceBus, Version=5.11.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Microsoft.Azure.WebJobs.Host.Listeners.FunctionListener+<StartAsync>d__13.MoveNext (Microsoft.Azure.WebJobs.Host, Version=3.0.37.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35: D:\a\_work\1\s\src\Microsoft.Azure.WebJobs.Host\Listeners\FunctionListener.cs:68)

score 1 · Accepted Answer · answered Jun 20 '23 at 04:15

he listener for function 'Functions.Function1' was unable to start. Service Bus account connection string 'AzureServiceBus:ConnectionString' does not exist.

Local.settings.json:

{
    "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated",
    "connn": "Endpoint=sb://rithser.servicebus.windows.net/;SharedAccessKeyName=RootManageSharedAccessKey;SharedAccessKey=W9fTV0="
  }
}

Local Output:

enter image description here

After Deploying your function to Azure , you need to make sure that your connection string is present in App settings of Configuration Section. For me my connection connn is missing: enter image description here

Now added connection string as below:

enter image description here

And you need to make sure that both(config and function) are same as below:

enter image description here

Now my Function is executed in Azure Portal.

Working. Thanks. On Azure the Connection is read from environment variable (which is update from Azure app settings) but not from the config (applicationsettings.json) as I assumed. — beewest, Jun 21 '23 at 05:14

Isolated Azure functions failed to access Azure Service Bus

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