详解C#如何控制多线程同步执行

public class ThreadTester
{
 
    public static void ThreadTest01()
    { 
        var task01 = new Task(() =>
        {
            Thread.Sleep(1000);
            Console.WriteLine("task01 执行完成");
        });
        // 以同步方式执行
        task01.RunSynchronously();
        Console.WriteLine("第一阶段主线程执行完成");
 
        var task02 = new Task(() =>
        {
            Thread.Sleep(1300);
            Console.WriteLine("task02 执行完成");
        });
        task02.Start();
        var task03 = new Task(() =>
        {
            Thread.Sleep(800);
            Console.WriteLine("task03 执行完成");
        });
        task03.Start();
        // 执行等待以保证同步
        task02.Wait();
        task03.Wait();
        Console.WriteLine("第二阶段主线程执行完成");
 
        var task04 = new Task(() =>
        {
            Thread.Sleep(1500);
            Console.WriteLine("task04 执行完成");
        });
        task04.Start();
        var task05 = new Task(() =>
        {
            Thread.Sleep(600);
            Console.WriteLine("task05 执行完成");
        });
        task05.Start();
        // 执行等待以保证同步
        Task.WaitAll(new Task[] { task04, task05 });
        Console.WriteLine("第三阶段主线程执行完成");
 
        var task06 = new Task(() =>
        {
            Thread.Sleep(1200);
            Console.WriteLine("task06 执行完成");
        });
        task06.Start();
        var task07 = new Task(() =>
        {
            Thread.Sleep(100);
            Console.WriteLine("task07 执行完成");
        });
        task07.Start();
        // 全部完成后再执行
        Task.WhenAll(new Task[] { task06, task07 }).ContinueWith((t) =>
        {
            Thread.Sleep(200);
            Console.WriteLine("第四阶段最后完成");
        });
        Console.WriteLine("第四阶段主线程执行完成");
 
        Console.ReadKey();
    }
 
}