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

<Application x:Class="WpfApp1.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WpfApp1"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <Style x:Key="LabelStyle" TargetType="Label">
            <Setter Property="FontSize" Value="14"/>
            <Setter Property="HorizontalContentAlignment" Value="Center"/>
            <Setter Property="HorizontalAlignment" Value="Center" />
            <Setter Property="Background" Value="AliceBlue"/>
        </Style>
        <Style x:Key="BorderStyle" TargetType="Border">
            <Setter Property="Height" Value="35"/>
            <Setter Property="VerticalAlignment" Value="Center"/>
            <Setter Property="Background" Value="AliceBlue"/>
        </Style>
    </Application.Resources>
</Application>

3、修改MainWindow.xaml及代码隐藏类

MainWindow.xaml

<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid Margin="20">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Rectangle Grid.ColumnSpan="2" Fill="White" RadiusX="14" RadiusY="14" Stroke="Blue" StrokeDashArray="3"/>
        <Rectangle Grid.Column="0" Margin="7" Fill="#FFF0F9D8" RadiusX="10" RadiusY="10" Stroke="Blue" StrokeDashArray="3"/>
        <Rectangle Grid.Column="0" Margin=" 20" Fill="White" Stroke="Blue"/>
        <ScrollViewer Grid.Column="0" Margin="20">
            <StackPanel>
                <StackPanel.Resources>
                    <Style TargetType="Button">
                        <Setter Property="HorizontalContentAlignment" Value="Center"/>
                        <Setter Property="Margin" Value="5 10 5 0"/>
                        <Setter Property="Padding" Value=" 15 0 15 0"/>
                        <Setter Property="FontSize" Value=" 10"/>
                        <EventSetter Event="Click" Handler="button_Click"/>
                    </Style>
                </StackPanel.Resources>
                <Button Content="例1（StartStopProcess）" Tag="/Examples/Page1.xaml"/>
                
            </StackPanel>
        </ScrollViewer>
        <Frame Name="frame1" Grid.Column="1" Margin="10" BorderThickness="1" BorderBrush="Blue" NavigationUIVisibility="Hidden"/>
    </Grid>
</Window>

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

<Page x:Class="WpfApp1.Examples.Page2"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:WpfApp1.Examples"
      mc:Ignorable="d" 
      d:DesignHeight="300" d:DesignWidth="300"
      Title="Page2">

    <DockPanel Background="White">
        <Label DockPanel.Dock="Top" Content="Thread和ThreadPool基本用法"
               Style="{StaticResource LabelStyle}"/>
        <Border DockPanel.Dock="Bottom" Style="{StaticResource BorderStyle}">
            <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
                <Button Name="btnStart" Width="70"
                        Content="启动任务" Click="btnStart_Click"/>
                <Button Name="btnStop" Margin="20 0 0 0" Width="70"
                        Content="停止任务" Click="btnStop_Click"/>
            </StackPanel>
        </Border>
        <TextBlock x:Name="textBlock1" Height="237" TextWrapping="Wrap" Text="" VerticalAlignment="Top"/>

    </DockPanel>
</Page>

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。