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  • C# -- 使用 Task 执行多线程任务

    C# -- 使用 Task 执行多线程任务

    1. 使用 Task 执行多线程任务

        class Program
        {
            static void Main(string[] args)
            {
                Task task1 = new Task(() => {
                    Console.WriteLine("线程ID:{0},开始执行", Thread.CurrentThread.ManagedThreadId);
                    Stopwatch stw = new Stopwatch();
                    stw.Start();
                    long result = SumNumbers(10000000);
                    stw.Stop();
                    Console.WriteLine("线程ID:{0},执行完成,执行结果:{1},执行用时{2},", Thread.CurrentThread.ManagedThreadId, result, stw.ElapsedMilliseconds);
                });
    
                Task task2 = new Task(() => {
                    Console.WriteLine("线程ID:{0},开始执行", Thread.CurrentThread.ManagedThreadId);
                    Stopwatch stw = new Stopwatch();
                    stw.Start();
                    long result = SumNumbers(20000000);
                    stw.Stop();
                    Console.WriteLine("线程ID:{0},执行完成,执行结果:{1},执行用时{2},", Thread.CurrentThread.ManagedThreadId, result, stw.ElapsedMilliseconds);
                });
    
                Task task3 = new Task(() => {
                    Console.WriteLine("线程ID:{0},开始执行", Thread.CurrentThread.ManagedThreadId);
                    Stopwatch stw = new Stopwatch();
                    stw.Start();
                    long result = SumNumbers(15000000);
                    stw.Stop();
                    Console.WriteLine("线程ID:{0},执行完成,执行结果:{1},执行用时{2},", Thread.CurrentThread.ManagedThreadId, result, stw.ElapsedMilliseconds);
                });
    
                task1.Start();
                task2.Start();
                task3.Start();
    
                Console.ReadKey();
            }
    
            static long SumNumbers(int count)
            {
                long sum = 0;
                for (int i = 0; i < count; i++)
                {
                    sum += i;
                }
                Thread.Sleep(3000);
                return sum;
            }
        }

    执行结果:

    2. 等待Task多线程任务执行完成

        class Program
        {
            static void Main(string[] args)
            {
                Task task1 = new Task(() => {
                    Console.WriteLine("线程ID:{0},开始执行", Thread.CurrentThread.ManagedThreadId);
                    Stopwatch stw = new Stopwatch();
                    stw.Start();
                    long result = SumNumbers(10000000);
                    stw.Stop();
                    Console.WriteLine("线程ID:{0},执行完成,执行结果:{1},执行用时{2},", Thread.CurrentThread.ManagedThreadId, result, stw.ElapsedMilliseconds);
                });
    
                Task task2 = new Task(() => {
                    Console.WriteLine("线程ID:{0},开始执行", Thread.CurrentThread.ManagedThreadId);
                    Stopwatch stw = new Stopwatch();
                    stw.Start();
                    long result = SumNumbers(20000000);
                    stw.Stop();
                    Console.WriteLine("线程ID:{0},执行完成,执行结果:{1},执行用时{2},", Thread.CurrentThread.ManagedThreadId, result, stw.ElapsedMilliseconds);
                });
    
                Task task3 = new Task(() => {
                    Console.WriteLine("线程ID:{0},开始执行", Thread.CurrentThread.ManagedThreadId);
                    Stopwatch stw = new Stopwatch();
                    stw.Start();
                    long result = SumNumbers(15000000);
                    stw.Stop();
                    Console.WriteLine("线程ID:{0},执行完成,执行结果:{1},执行用时{2},", Thread.CurrentThread.ManagedThreadId, result, stw.ElapsedMilliseconds);
                });
    
                List<Task> listTask = new List<Task>();
                listTask.Add(task1);
                listTask.Add(task2);
                listTask.Add(task3);
    
                task1.Start();
                task2.Start();
                task3.Start();
    
                Task.WaitAll(listTask.ToArray());
                Console.WriteLine("所有线程执行完成。");
    
                Console.ReadKey();
            }
    
            static long SumNumbers(int count)
            {
                long sum = 0;
                for (int i = 0; i < count; i++)
                {
                    sum += i;
                }
                Thread.Sleep(3000);
                return sum;
            }
        }

    执行结果:

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  • 原文地址:https://www.cnblogs.com/ChengWenHao/p/CSharpTask.html
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