WPF调用线程（二)复制文件并显示进度条

这一段时间要进行WPF及多线程的培训，于是就写了一个例子，主要功能是用复制文件时，显示进度条。以演示在WPF中，如何调用线程，基础理论就不多说了，园子里好多大牛都写过，MSDN也有详尽介绍，也可以查看我的前两篇文章，

C#线程基础

WPF调用线程（-)

也有一些介绍，先看运行效果

xaml如下：

<Window x:Class="WpfThreadTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Closed="Window_Closed" Loaded="Window_Loaded"  Height="209" Width="537" ResizeMode="NoResize">
    <Grid Height="186">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="132*" />
            <ColumnDefinition Width="236*" />
            <ColumnDefinition Width="147*" />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />            
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <TextBlock Name="textBlock1" Text="当前时间" Margin="35 10" Height="auto" Width="auto" />
        <TextBox Grid.Column="1" Name="displayTimeByThread" Height="auto" Margin="0 10" />
        <TextBlock Grid.Row="1" Name="textBlock2" Margin="35 10 0 10 " Text="源文件位置" />
        <TextBox Grid.Column="1" Grid.Row="1" Name="srcFile" Margin="0 10" />
        <TextBox Grid.Column="1" Grid.Row="2" Name="saveFilePath" Margin="0 10" />
        <TextBlock Grid.Row="2" Name="textBlock3" Text="目标文件位置" Margin="35 10 0 10" />
        <Button Content="..." Grid.Column="2" Grid.Row="1" Name="button1" Margin="10,10,66,10" Click="button1_Click" />
        <Button Content="..." Grid.Column="2" Grid.Row="2" Name="button2" Margin="10,10,66,10" Height="23" Click="button2_Click"/>
        <Button Content="开始时间线程" Grid.Column="2" Name="button3"  Margin="10,10,35,10" Height="23" Click="button3_Click" />
        <Button Content="开始文件Copy线程" Grid.Column="2" Grid.Row="3" Height="29" HorizontalAlignment="Left" Name="button4" VerticalAlignment="Top" Width="119" Click="button4_Click" />
        <TextBlock Grid.Row="3" Name="copyFlag" Text="开始复制" />
        <TextBlock Name="displayCopyInfo" Text="文件Copy进行中" Grid.Row="3" Grid.Column="1"  />
        <ProgressBar Grid.Column="1" Grid.Row="4" Margin="0 2" Height="8" Name="copyProgress" />
    </Grid>
</Window>

后台CS

namespace WpfThreadTest
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
     public partial class MainWindow : Window
    {
        Thread timeThread;
        Thread copyThread;
        public MainWindow()
        {
            InitializeComponent();
            this.displayTimeByThread.Text = DateTime.Now.ToLocalTime().ToString("yyyy年MM月dd日 hh:mm:ss"); ;
            timeThread = new Thread(new ThreadStart(DispatcherThread));
        }
        private void button3_Click(object sender, RoutedEventArgs e)
        {
            timeThread.Start();        
        }
        public void DispatcherThread()
        {
            //可以通过循环条件来控制UI的更新
             while (true)
            {
                ///线程优先级，最长超时时间，方法委托（无参方法）
                 displayTimeByThread.Dispatcher.BeginInvoke(
                    DispatcherPriority.Normal, new Action(UpdateTime));
                Thread.Sleep(1000);                
            }
        }

        
        private void UpdateTime()
        {
            this.displayTimeByThread.Text = DateTime.Now.ToLocalTime().ToString("yyyy年MM月dd日 hh:mm:ss");      
        }

        private void Window_Closed(object sender, EventArgs e)
        {
            ///关闭所有启动的线程
            timeThread.Abort();
            copyThread.Abort();
            Application.Current.Shutdown();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
             ///设定要复制的文件全路径
            OpenFileDialog openFile = new OpenFileDialog();
            openFile.AddExtension = true;
            openFile.CheckPathExists = true;
            openFile.Filter = "*.rar|*.rar|all files|*.*";
            openFile.FilterIndex = 0;
            openFile.Multiselect = false;
            bool? f=openFile.ShowDialog();
            if (f!=null && f.Value)
            {
                this.srcFile.Text = openFile.FileName;
            }
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            ///设定目标文件全路径
            SaveFileDialog saveFile = new SaveFileDialog();
            saveFile.AddExtension = true;
            saveFile.Filter = "*.rar|*.rar|all files|*.*";
            saveFile.FilterIndex = 0;
            
            bool? f= saveFile.ShowDialog();
            if (f != null && f.Value)
            {
                this.saveFilePath.Text = saveFile.FileName;
            }
        }

        private void button4_Click(object sender, RoutedEventArgs e)
        {
            string fileName=this.srcFile.Text.Trim();
            string destPath=this.saveFilePath.Text.Trim();
            if(!File.Exists(fileName))
            {
                MessageBox.Show("源文件不存在");
                return;
            }

            ///copy file and nodify ui that rate of progress of file copy          
            this.copyFlag.Text = "开始复制。。。";

            //设置进度条最大值，这句代码写的有点郁闷
            this.copyProgress.Maximum = (new FileInfo(fileName)).Length;

            //保存复制文件信息，以进行传递
            CopyFileInfo c = new CopyFileInfo() { SourcePath = fileName, DestPath = destPath };
            //线程异步调用复制文件
            copyThread = new Thread(new ParameterizedThreadStart(CopyFile));           
            copyThread.Start(c);

            this.copyFlag.Text = "复制完成。。。";
            
            
        }
        /// <summary>
        /// 复制文件的委托方法
        /// </summary>
        /// <param name="obj">复制文件的信息</param>
        private void CopyFile(object obj)
        {
            CopyFileInfo c = obj as CopyFileInfo;
            CopyFile(c.SourcePath, c.DestPath);
        }
        /// <summary>
        /// 复制文件
        /// </summary>
        /// <param name="sourcePath"></param>
        /// <param name="destPath"></param>
        private void CopyFile( string sourcePath,string destPath)
        {
            FileInfo f = new FileInfo(sourcePath);
            FileStream fsR = f.OpenRead();
            FileStream fsW = File.Create(destPath);
            long fileLength = f.Length;
            byte[] buffer = new byte[1024];
            int n = 0;
            
            while (true)
            {
                ///设定线程优先级
                ///异步调用UpdateCopyProgress方法
                ///并传递2个long类型参数fileLength 与 fsR.Position
                this.displayCopyInfo.Dispatcher.BeginInvoke(DispatcherPriority.SystemIdle,
                    new Action<long, long>(UpdateCopyProgress), fileLength, fsR.Position);
                
                //读写文件
                n=fsR.Read(buffer, 0, 1024); 
                if (n==0)
                {
                    break;
                }
                fsW.Write(buffer, 0, n);
                fsW.Flush();
                Thread.Sleep(1);
            }
            fsR.Close();
            fsW.Close(); 
        }

        private void UpdateCopyProgress(long fileLength,long currentLength)
        {
            this.displayCopyInfo.Text = string.Format("总大小：{0},已复制:{1}", fileLength, currentLength);
            //刷新进度条            
            this.copyProgress.Value = currentLength;
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
           
        }
         
    }
    public class CopyFileInfo
    {
        public string SourcePath { get; set; }
        public string DestPath { get; set; }        
    }
}