Analyzer DURABLE2001 fails for activities that require FunctionContext without input data

[jholtmann]

Description

When calling an activity that has no input DTO but still requires FunctionContext from an orchestrator, the DURABLE2001 analyzer reports an incorrect warning with the text: CallActivityAsync is passing the incorrect type 'none' instead of 'FunctionContext' to the activity function 'DemoActivity'.

DemoFunctionApp succeeded with 1 warning(s) (2.0s) → DemoFunctionApp\bin\Release\net8.0\DemoFunctionApp.dll
    C:\Users\jholtmann\source\repos\DemoFunctionApp\DemoFunctionApp\Demo.cs(16,19): warning DURABLE2001: CallActivityAsync is passing the incorrect type 'none' instead of 'FunctionContext' to the activity function 'DemoActivity'

Expected behavior

• The analyzer should not report a warning in this scenario.

Actual behavior

• The analyzer reports a spurious warning.

Relevant source code snippets

    public class Demo
    {
        [Function(nameof(DemoOrchestrato))]
        public async Task DemoOrchestrato([OrchestrationTrigger] TaskOrchestrationContext context)
        {
            await context.CallActivityAsync(nameof(DemoActivity));
        }

        [Function(nameof(DemoActivity))]
        public async Task DemoActivity([ActivityTrigger] FunctionContext context)
        {
            context.GetLogger<Demo>().LogInformation("Hello from DemoActivity");
            await Task.Delay(1);
        }

        [Function(nameof(DemoTrigger))]
        public async Task<HttpResponseData> DemoTrigger(
            [HttpTrigger(AuthorizationLevel.Function, "post")] HttpRequestData req,
            [DurableClient] DurableTaskClient starter,
            FunctionContext context
        )
        {
            context.GetLogger<Demo>().LogInformation("C# HTTP trigger function processed a request.");

            var instanceId = await starter.ScheduleNewOrchestrationInstanceAsync(nameof(DemoOrchestrato));
            return starter.CreateCheckStatusResponse(req, instanceId);
        }
    }

Known workarounds

• Disabling the analyzer DURABLE2001 at the project level resolves the warning

App Details

• Microsoft.Azure.Functions.Worker.Extensions.DurableTask: 1.6.0+
• Azure Functions runtime: 2.0
• Language: C#

Screenshots

If deployed to Azure

• No Azure deployment required, reproduces in IDE/when compiling with dotnet build -c Release

[Schmaga]

We are having the same problem with .NET 9, Functions Runtime 4 and the version 1.7.1 of Microsoft.Azure.Functions.Worker.Extensions.DurableTask. Only thing that seems to help is to disable the specific analyzer warning in the function project.