C#编写一个简易的文件监控系统

Posted 2021-04-14 CSharp学习

今天总结的是如何利用C#编写一个简单的文件监控系统（参考《C#入门经典》）；

1、新建一个WPF应用，并命名FileWatch，界面如下：

XAML代码如下：

  
    
    
  

   
     
     
   <Window x:Class="FileWatch.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:FileWatch"
   
     
     
   Title="File Monitor" Height="160" Width="300">
   
     
     
   <Grid>
   
     
     
   <Grid.RowDefinitions>
   
     
     
   <RowDefinition Height="Auto"/>
   
     
     
   <RowDefinition Height="Auto"/>
   
     
     
   <RowDefinition/>
   
     
     
   </Grid.RowDefinitions>
   
     
     
   <Grid Margin="4">
   
     
     
   <Grid.ColumnDefinitions>
   
     
     
   <ColumnDefinition/>
   
     
     
   <ColumnDefinition Width='Auto' />
   
     
     
   </Grid.ColumnDefinitions>
   
     
     
   <TextBox Name="LocationBox" TextChanged="LocationBox_TextChanged"/>
   
     
     
   <Button Name="BrowseButton" Grid.Column="1"
   
     
     
   Content="Browse..." Click="BrowseButton_Click" />
   
     
     
   </Grid>
   
     
     
   <Button Name="WatchButton" Content="Watch!" Margin="4" Grid.Row="1"
   
     
     
   Click="WatchButton_Click" IsEnabled="False" />
   
     
     
           <ListBox Name="WatchOutput" Margin="4" Grid.Row="2" />
   
     
     
   </Grid>
   
     
     
   </Window>
  
    
    
  

2、在Main Window.xaml.cs中添加下面的using指令：

  
    
    
  

   
     
     
   using System.IO;
   
     
     
   using Microsoft.Win32;
  
    
    
  

3、在Main Window类中添加FileSystemWatch类型的一个字段

  
    
    
  

   
     
     
   namespace FileWatch
   
     
     
   {
   
     
     
   public partial class MainWindow : Window
   
     
     
   {
   
     
     
   private FileSystemWatcher watcher;
  
    
    
  

4、在Main Window类中添加AddMessage方法，后台线程向输出添加信息

  
    
    
  

   
     
     
   private void AddMessage(string name)
   
     
     
   {
   
     
     
   Dispatcher.BeginInvoke(new Action(
   
     
     
   () => WatchOutput.Item.Insert(
   
     
     
   0,message)));
   
     
     
   }
  
    
    
  

5、初始化FileSystemWatch对象，以及将事件关联到Addmessage（）方法调用；

  
    
    
  

   
     
     
   public MainWindow()
   
     
     
    {
   
     
     
    InitializeComponent();
   
     
     
    watcher = new FileSystemWatcher();
   
     
     
    watcher.Deleted += (s, e) =>
   
     
     
    AddMessage($"File: {e.FullPath} Deleted");
   
     
     
    watcher.Renamed += (s, e) =>
   
     
     
    AddMessage($"File Renamed from {e.OldName} to {e.FullPath}");
   
     
     
    watcher.Changed += (s, e) =>
   
     
     
    AddMessage($"File: {e.FullPath} {e.ChangeType.ToString()}");
   
     
     
    watcher.Created += (s, e) =>
   
     
     
    AddMessage($"File: {e.FullPath} Created");
   
     
     
    }
  
    
    
  

6、添加Browse按钮的Click事件处理程序

  
    
    
  

   
     
     
   private void BrowseButton_Click(object sender, RoutedEventArgs e)
   
     
     
    {
   
     
     
    OpenFileDialog dialag = new OpenFileDialog();
   
     
     
   if (dialag.ShowDialog(this) ==true)
   
     
     
    {
   
     
     
    LocationBox.Text = dialag.FileName;
   
     
     
    }
   
     
     
    }
  
    
    
  

7、添加TextBox的事件处理程序TextChanged

  
    
    
  

   
     
     
   private void LocationBox_TextChanged(object sender, TextChangedEventArgs e)
   
     
     
    {
   
     
     
    WatchButton.IsEnabled = !string.IsNullOrEmpty(LocationBox.Text);
   
     
     
    }
  
    
    
  

8、添加Watch！按钮的Click事件

  
    
    
  

   
     
     
   private void WatchButton_Click(object sender, RoutedEventArgs e)
   
     
     
    {
   
     
     
    watcher.Path = System.IO.Path.GetDirectoryName(LocationBox.Text);
   
     
     
    watcher.Filter = System.IO.Path.GetFileName(LocationBox.Text);
   
     
     
    watcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.Size;
   
     
     
    AddMessage("Watching" + LocationBox.Text);
   
     
     
    watcher.EnableRaisingEvents = true;
   
     
     
    }
  
    
    
  

9、创建目录C:\TempWatch,在该目录创建文件temp.txt,就可以运行该程序，监控temp.txt文件了；

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