实验4：线程管理练习

1、通过本实验，熟悉和掌握Thread类、ThreadPool类以及WPF中多线程的使用。
2、复习C#中lambda表达式和委托

1、创建一个WPF应用程序项目

2、将App.xaml中的Application.Resources节内容改为

3、修改MainWindow.xaml及代码隐藏类

MainWindow.xaml

MainWindow.xaml.cs主要内容

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp1
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        Button oldButton = new Button();
        public MainWindow()
        {
            InitializeComponent();
        }
        private void button_Click(object sender, RoutedEventArgs e)
        {
            Button btn = e.Source as Button;
            btn.Foreground = Brushes.Black;
            oldButton.Foreground = Brushes.Black;
            oldButton = btn;
            frame1.Source = new Uri(btn.Tag.ToString(), UriKind.Relative);
        }
    }
}

Page2.xaml

Page2.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp1.Examples
{
    /// <summary>
    /// Page2.xaml 的交互逻辑
    /// </summary>
    public partial class Page2 : Page
    {
        public Page2()
        {
            InitializeComponent();
            Helps.ChangeState(btnStart, true, btnStop, false);
        }

        private void btnStop_Click(object sender, RoutedEventArgs e)
        {
            MyClass.IsSTop = true;
            Helps.ChangeState(btnStart, true, btnStop, false);

        }

        private void btnStart_Click(object sender, RoutedEventArgs e)
        {
            Helps.ChangeState(btnStart, false, btnStop, true);
            MyClass.IsSTop = false;
            textBlock1.Text = "";
            MyClass c = new MyClass(textBlock1);
            MyData state = new MyData { Message = "a", Info = "\n线程1已终止" };
            Thread thread1 = new Thread(c.MyMethod);
            thread1.IsBackground = true;
            thread1.Start(state);
            state = new MyData { Message = "b", Info = "\n线程2已终止" };
            Thread thread2 = new Thread(c.MyMethod);
            thread2.IsBackground = true;
            thread2.Start(state);
            state = new MyData { Message = "c", Info = "\n线程3已终止" };
            ThreadPool.QueueUserWorkItem(new WaitCallback(c.MyMethod), state);
            state = new MyData { Message = "d", Info = "\n线程4已终止" };
            ThreadPool.QueueUserWorkItem(new WaitCallback(c.MyMethod), state);


        }
    }
    public class MyClass
    {
        public static volatile bool IsSTop;
        TextBlock textBlock1;
        public MyClass(TextBlock textBlock1)
        {
            this.textBlock1 = textBlock1;
        }
        public void MyMethod(object obj)
        {
            MyData state = obj as MyData;
            while (IsSTop==false)
            {
                AddMessage(state.Message);
                Thread.Sleep(1000);
            }
            AddMessage(state.Info);
        }
        private void AddMessage(string s)
        {
            textBlock1.Dispatcher.Invoke(() =>
            {
                textBlock1.Text += s;

            });

        }
    }
    public class MyData
    {
        public string Info { get; set; }
        public string Message { get; set; }
    }
}

新建Helps类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Controls;

namespace WpfApp1.Examples
{
    class Helps
    {
        public static void ChangeState(Button btnStart,bool isStart,Button btnStop,bool isStop)
        {
            btnStart.IsEnabled = isStart;
            btnStop.IsEnabled = isStop;

        }
    }
}

运行结果

在实验3的基础上实现了实验4
通过本实验，即熟悉和掌握了线程管理Thread类、线程池ThreadPool类以及
WPF中多线程的使用，又复习C#中lambda表达式和委托。