using System;
using System.Linq;
using System.Collections.Generic;
using System.Collections.Concurrent;
using System.Reflection;
using System.Linq.Expressions;
using System.Threading;
using System.Threading.Tasks;

var local = new AsyncLocal<string?>();
local.Value = "root";
Task<string> work;
using (ExecutionContext.SuppressFlow()) { work = Task.Run(() => local.Value ?? "none"); }
Console.WriteLine($"worker:{await work}");
await Task.CompletedTask.ConfigureAwait(false);
Console.WriteLine($"parent:{local.Value}");
Console.WriteLine($"suppressed:{ExecutionContext.IsFlowSuppressed()}");