利用FileWatcher实现文件实时监视

FileWatcher能实现对某一目录的文件(新建,改名,内容修改,删除)的实时监视

using  System;
using  System.IO;
using  System.Windows.Forms;

namespace  Fw
{
     public   partial   class  frm1 : Form
    {
         private  FileSystemWatcher watcher;
         private   delegate   void  UpdateWatchTextDelegate( string  newText);


         public  frm1()
        {
            InitializeComponent();
             this .watcher  =   new  FileSystemWatcher();
             this .watcher.Deleted  +=   new  FileSystemEventHandler(watcher_Deleted);
             this .watcher.Renamed  +=   new  RenamedEventHandler(watcher_Renamed);
             this .watcher.Changed  +=   new  FileSystemEventHandler(watcher_Changed);
             this .watcher.Created  +=   new  FileSystemEventHandler(watcher_Created);

        }

         public   void  UpdateWatchText( string  newText)
        {
            lblWatch.Text  =  newText;
        }


         public   void  WriteLog( string  LogContent) 
        {
             using  (StreamWriter sw  =   new  StreamWriter( " c:\\Log.txt " ,  true ))
            {
                sw.WriteLine(LogContent);
                sw.Close();
            } 
            
        }

         void  watcher_Created( object  sender, FileSystemEventArgs e)
        {           
             try
            {
                WriteLog(String.Format( " File: {0} Created " , e.FullPath));
                 this .BeginInvoke( new  UpdateWatchTextDelegate(UpdateWatchText),  " 文件 "   +  e.FullPath  +   " 被创建 " );
            }
             catch  (IOException)
            {
                 this .BeginInvoke( new  UpdateWatchTextDelegate(UpdateWatchText),  " 创建日志写入失败! " );
            }
        }


         void  watcher_Changed( object  sender, FileSystemEventArgs e)
        {            
             try
            {              
                WriteLog(String.Format( " File: {0} {1} " , e.FullPath, e.ChangeType.ToString()));
                 this .BeginInvoke( new  UpdateWatchTextDelegate(UpdateWatchText),  " 文件 "   +  e.FullPath  +   " 被修改 " );
            }
             catch  (IOException)
            {
                 this .BeginInvoke( new  UpdateWatchTextDelegate(UpdateWatchText),  " 修改日志写入失败! " );
            }
        }

         void  watcher_Renamed( object  sender, RenamedEventArgs e)
        {            
             try
            {               
                WriteLog(String.Format( " File renamed from {0} to {1} " , e.OldName, e.FullPath));
                 this .BeginInvoke( new  UpdateWatchTextDelegate(UpdateWatchText),  " 文件 "   +  e.OldName  +   " 被重命名为 "   +  e.FullPath);
            }
             catch  (IOException)
            {
                 this .BeginInvoke( new  UpdateWatchTextDelegate(UpdateWatchText),  " 重命名日志写入失败! " );
            }
        }

         void  watcher_Deleted( object  sender, FileSystemEventArgs e)
        {            
             try
            {                
                WriteLog(String.Format( " File: {0} Deleted " , e.FullPath));
                 this .BeginInvoke( new  UpdateWatchTextDelegate(UpdateWatchText),  " 文件 "   +  e.FullPath  +   " 被删除 " );
            }
             catch  (IOException)
            {
                 this .BeginInvoke( new  UpdateWatchTextDelegate(UpdateWatchText),  " 删除日志写入失败! " );
            }
        }


         private   void  cmdBrowse_Click( object  sender, EventArgs e)
        {
             if  ( this .folderBrowserDialog1.ShowDialog()  !=  DialogResult.Cancel)
            {
                txtLocation.Text  =   this .folderBrowserDialog1.SelectedPath;
                cmdWatch.Enabled  =   true ;
            }
        }

         private   void  cmdWatch_Click( object  sender, EventArgs e)
        {
             if  (txtLocation.Text.Length  <=   0 ) 
            {
                MessageBox.Show( " 请先选择要监视的文件夹! " );
                cmdBrowse.Focus();
                 return ;
            }
            watcher.Path  =  txtLocation.Text; // 监控路径（文件夹）
            watcher.Filter  =   " *.* " ; // 如果filter为文件名称则表示监控该文件，如果为*.txt则表示要监控指定目录当中的所有.txt文件
            watcher.NotifyFilter  =  NotifyFilters.LastWrite  |
                NotifyFilters.FileName  |
                NotifyFilters.Size;
            lblWatch.Text  =  watcher.Path  +   "  监视中 " ;

             // begin watching.
            watcher.EnableRaisingEvents  =   true ;
        }

         private   void  btnStop_Click( object  sender, EventArgs e)
        {
            watcher.EnableRaisingEvents  =   false ;
            lblWatch.Text  =  watcher.Path  +   "  监视已经停止! " ;
        }




    }
}

注：如果目录下还有子目录，FileWatcher默认情况下并不能监视到子目录下的文件，可以通过设置watcher.IncludeSubdirectories = true; 解决这个问题

源代码下载:http://files.cnblogs.com/yjmyzz/FileWatcher.rar