需要全面的C#System.Threading.Tasks示例

using System;
using System.Threading;
using System.Threading.Tasks;

class Program
{
    static void Main()
    {
        // 创建一个任务并启动
        Task task1 = Task.Run(() =>
        {
            Console.WriteLine("Task 1 is running.");
            Thread.Sleep(1000);
            Console.WriteLine("Task 1 is completed.");
        });

        // 创建一个带返回值的任务并启动
        Task<string> task2 = Task.Run(() =>
        {
            Console.WriteLine("Task 2 is running.");
            Thread.Sleep(2000);
            Console.WriteLine("Task 2 is completed.");
            return "Task 2 result";
        });

        // 创建一个任务并等待其他任务完成后再启动
        Task task3 = task2.ContinueWith((prevTask) =>
        {
            Console.WriteLine("Task 3 is running after Task 2 is completed.");
            Thread.Sleep(500);
            Console.WriteLine("Task 3 is completed.");
        });

        // 创建一个带返回值的任务并等待其他任务完成后再启动
        Task<string> task4 = task2.ContinueWith((prevTask) =>
        {
            Console.WriteLine("Task 4 is running after Task 2 is completed.");
            Thread.Sleep(500);
            Console.WriteLine("Task 4 is completed.");
            return "Task 4 result";
        });

        // 等待所有任务完成
        Task.WaitAll(task1, task2, task3, task4);

        // 输出任务的返回值
        Console.WriteLine("Task 2 result: " + task2.Result);
        Console.WriteLine("Task 4 result: " + task4.Result);

        Console.ReadLine();
    }
}