相关疑难解决方法(0)

这是一个简单的WinForms应用程序:

using System;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private async void button1_Click(object sender, EventArgs e)
        {
            var ts = TaskScheduler.FromCurrentSynchronizationContext();
            await Task.Factory.StartNew(async () =>
            {
                Debug.WriteLine(new
                {
                    where = "1) before await",
                    currentTs = TaskScheduler.Current,
                    thread = Thread.CurrentThread.ManagedThreadId,
                    context = SynchronizationContext.Current
                });

                await Task.Yield(); // or await Task.Delay(1)

                Debug.WriteLine(new
                {
                    where = "2) after await",
                    currentTs = TaskScheduler.Current,
                    thread = Thread.CurrentThread.ManagedThreadId,
                    context …