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 }
