Program.cs

// Minimal repro for DurableTask.Analyzers ArgumentNullException('node') bug.
//
// The analyzer (v0.2.0) crashes when AddOrchestratorFunc is called with an
// inline lambda inside a foreach loop that captures a loop-scoped variable.
//
// The analyzer is pulled transitively via:
//   Microsoft.Azure.Functions.Worker.Extensions.DurableTask 1.13.1
//     -> Microsoft.DurableTask.Analyzers 0.2.0

using Microsoft.Azure.Functions.Worker;
using Microsoft.Azure.Functions.Worker.Builder;
using Microsoft.DurableTask;
using Microsoft.DurableTask.Worker;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

var builder = FunctionsApplication.CreateBuilder(args);

string[] names = ["A", "B"];

builder.ConfigureDurableWorker().AddTasks(tasks =>
{
    foreach (string name in names)
    {
        tasks.AddOrchestratorFunc<string, string>(
            name,
            async (ctx, input) =>
            {
                ILogger logger = ctx.CreateReplaySafeLogger(name);
                return await ctx.CallActivityAsync<string>("Activity", input);
            });
    }
});

builder.Build().Run();