线程池使用转帖

最新推荐文章于 2022-02-24 22:20:08 发布

转载最新推荐文章于 2022-02-24 22:20:08 发布 · 774 阅读

文章标签：

#object #button #action #string #class #null

本文通过实例演示了如何使用线程池进行任务调度，并展示了如何获取线程池中线程的状态信息。文中还介绍了如何利用线程池进行计算任务处理及参数传递，包括设置线程池的最大线程数，调用线程池执行方法等。

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namespace WpfThreadTest
2 {
3     /// <summary>
4     /// ThreadPoolDemo.xaml 的交互逻辑
5     /// </summary>
6     public partial class ThreadPoolDemo : Window
7     {
8         public ThreadPoolDemo()
9         {
10             InitializeComponent();
11             ///设置线程池的最大可用辅助线程数目，最大异步线程数目
12             ThreadPool.SetMaxThreads(100, 10);
13
14         }
15
16         private void button1_Click(object sender, RoutedEventArgs e)
17         {
18              //调用线程去计算数字，仅供演示
19              ThreadPool.QueueUserWorkItem(new WaitCallback(CountNumber), 1);
20         }
21         private void CountNumber(object state)
22         {
23             int count = int.Parse(state.ToString());
24             while (true)
25             {
26                 count++;
27                 this.textBlock2.Dispatcher.Invoke(
28                     DispatcherPriority.Normal,
29                     new Action(() =>
30                     {
31                         this.textBlock2.Text = count.ToString();
32                     }));
33                 Thread.Sleep(100);
34             }
35         }
36         /// <summary>
37         /// 测试线程中传递引用对象，以期望获得返回值
38         /// </summary>
39         /// <param name="state"></param>
40         private void ReturnValueMethod(object state)
41         {
42             MyParam myParam = state as MyParam;
43             myParam.MyInt = 100;
44             myParam.MyString = "updated string";
45         }
46
47         private void button2_Click(object sender, RoutedEventArgs e)
48         {
49             ///将引用对象传递给线程
50             MyParam myParam = new MyParam() { MyInt = 12, MyString = "test" };
51
52             ThreadPool.QueueUserWorkItem(new WaitCallback(ReturnValueMethod), myParam);
53
54             ///主线程睡眠5ms后，再去读取对象的值
55             ///如果不睡眠，直接读取，可能读不到修改后的值，因为他们处于不同的线程当中
56             ///当主线程去读取时，子线程尚未更改,
57             ///即便如此，也会有读取不到的时候，故此种传值方式并不十分可取，
58             ///具体线程返回值可以参考MSDN http://msdn.microsoft.com/zh-cn/library/wkays279.aspx
59             Thread.Sleep(5);
60             this.textBlock1.Text=string.Format("MyInt:{0},MyString:{1}", myParam.MyInt, myParam.MyString);
61         }
62
63         private void button3_Click(object sender, RoutedEventArgs e)
64         {
65             ThreadPool.QueueUserWorkItem(new WaitCallback(GetThreadPoolInfo), null);
66         }
67         private void GetThreadPoolInfo(object state)
68         {
69             while (true)
70             {
71                 int workerThreads = 0;
72                 int completionPortThreads = 0;
73                 ThreadPool.GetAvailableThreads(out workerThreads, out completionPortThreads);
74                 this.textBlock3.Dispatcher.Invoke(DispatcherPriority.SystemIdle, new Action(() =>
75                 {
76                     this.textBlock3.Text =
77                         string.Format("池中可用辅助线程：{0},可用异步 I/O 线程：{1}",
78 workerThreads, completionPortThreads);
79                 }));
80                 Thread.Sleep(1000);
81             }
82         }
83     }
84     public class MyParam
85     {
86         public int MyInt { get; set; }
87         public string MyString { get; set; }
88     }
89 }