C# -- 使用 Task 执行多线程任务

发布时间：2020-12-15 04:45:22 所属栏目：百科来源：网络整理

导读：C# -- 使用 Task 执行多线程任务 1. 使用 Task 执行多线程任务 Main( = Task(() => = result = SumNumbers( Task task2 /span= span style="color: #0000ff"gt;new/span Task(() =span style="color: #000000"gt; { Console.WriteLine(/spanspan style="colo

1. 使用 Task 执行多线程任务

Main(= Task(() =>= result = SumNumbers(

        Task task2 </span>= <span style="color: #0000ff"&gt;new</span> Task(() =><span style="color: #000000"&gt; {
            Console.WriteLine(</span><span style="color: #800000"&gt;"</span><span style="color: #800000"&gt;线程ID:{0},Thread.CurrentThread.ManagedThreadId);
            Stopwatch stw </span>= <span style="color: #0000ff"&gt;new</span><span style="color: #000000"&gt; Stopwatch();
            stw.Start();
            </span><span style="color: #0000ff"&gt;long</span> result = SumNumbers(<span style="color: #800080"&gt;20000000</span><span style="color: #000000"&gt;);
            stw.Stop();
            Console.WriteLine(</span><span style="color: #800000"&gt;"</span><span style="color: #800000"&gt;线程ID:{0},stw.ElapsedMilliseconds);
        });

        Task task3 </span>= <span style="color: #0000ff"&gt;new</span> Task(() =><span style="color: #000000"&gt; {
            Console.WriteLine(</span><span style="color: #800000"&gt;"</span><span style="color: #800000"&gt;线程ID:{0},Thread.CurrentThread.ManagedThreadId);
            Stopwatch stw </span>= <span style="color: #0000ff"&gt;new</span><span style="color: #000000"&gt; Stopwatch();
            stw.Start();
            </span><span style="color: #0000ff"&gt;long</span> result = SumNumbers(<span style="color: #800080"&gt;15000000</span><span style="color: #000000"&gt;);
            stw.Stop();
            Console.WriteLine(</span><span style="color: #800000"&gt;"</span><span style="color: #800000"&gt;线程ID:{0},stw.ElapsedMilliseconds);
        });

        task1.Start();
        task2.Start();
        task3.Start();

        Console.ReadKey();
    }

    </span><span style="color: #0000ff"&gt;static</span> <span style="color: #0000ff"&gt;long</span> SumNumbers(<span style="color: #0000ff"&gt;int</span><span style="color: #000000"&gt; count)
    {
        </span><span style="color: #0000ff"&gt;long</span> sum = <span style="color: #800080"&gt;0</span><span style="color: #000000"&gt;;
        </span><span style="color: #0000ff"&gt;for</span> (<span style="color: #0000ff"&gt;int</span> i = <span style="color: #800080"&gt;0</span>; i < count; i++<span style="color: #000000"&gt;)
        {
            sum </span>+=<span style="color: #000000"&gt; i;
        }
        Thread.Sleep(</span><span style="color: #800080"&gt;3000</span><span style="color: #000000"&gt;);
        </span><span style="color: #0000ff"&gt;return</span><span style="color: #000000"&gt; sum;
    }
}</span></pre>

执行结果：

2. 等待Task多线程任务执行完成

Main(= Task(() =>

        List</span><Task> listTask = <span style="color: #0000ff"&gt;new</span> List<Task><span style="color: #000000"&gt;();
        listTask.Add(task1);
        listTask.Add(task2);
        listTask.Add(task3);

        task1.Start();
        task2.Start();
        task3.Start();

        Task.WaitAll(listTask.ToArray());
        Console.WriteLine(</span><span style="color: #800000"&gt;"</span><span style="color: #800000"&gt;所有线程执行完成。</span><span style="color: #800000"&gt;"</span><span style="color: #000000"&gt;);

        Console.ReadKey();
    }

    </span><span style="color: #0000ff"&gt;static</span> <span style="color: #0000ff"&gt;long</span> SumNumbers(<span style="color: #0000ff"&gt;int</span><span style="color: #000000"&gt; count)
    {
        </span><span style="color: #0000ff"&gt;long</span> sum = <span style="color: #800080"&gt;0</span><span style="color: #000000"&gt;;
        </span><span style="color: #0000ff"&gt;for</span> (<span style="color: #0000ff"&gt;int</span> i = <span style="color: #800080"&gt;0</span>; i < count; i++<span style="color: #000000"&gt;)
        {
            sum </span>+=<span style="color: #000000"&gt; i;
        }
        Thread.Sleep(</span><span style="color: #800080"&gt;3000</span><span style="color: #000000"&gt;);
        </span><span style="color: #0000ff"&gt;return</span><span style="color: #000000"&gt; sum;
    }
}</span></pre>

执行结果：

（编辑：李大同）

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