C# 实现监控文件夹和里面文件的变化

该文来自于这里

描述：

• FileSystemWatcher位于System.IO;
• 命名空间下面，想要使用它必须先引用System.IO;

下面的例子使用了FileSystemWatcher来监控C盘文件的变化，因为这个目录的变化是最频繁的，运行程序打开浏览器可以看到很频繁的临时文件创建，需要注意的是：

• 添加文件或文件夹时，会触发Created事件，然后修改默认文件夹或文件名称再触发Changed事件。
• 复制或移动文件夹文件时则是触发Created事件。
• 删除文件夹或文件时触发Deleted事件。

下面是整个例子的代码，可以建一个空的控制台应用程序复制粘贴就能运行了：

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
 
namespace HelloCsharp
{
    class Program
    {
        static void Main(string[] args)
        {
            FileListenerServer f1 = new FileListenerServer(@"c:");
            f1.Start();
            Console.ReadKey();
        }
    }
    public class FileListenerServer
    {
        private FileSystemWatcher _watcher;
        public FileListenerServer()
        {
        }
        public FileListenerServer(string path)
        {
 
            try
            {
 
                this._watcher = new FileSystemWatcher();
                _watcher.Path = path;
                _watcher.NotifyFilter = NotifyFilters.FileName | NotifyFilters.Size | NotifyFilters.DirectoryName;
                _watcher.IncludeSubdirectories = true;
                _watcher.Created += new FileSystemEventHandler(FileWatcher_Created);
                _watcher.Changed += new FileSystemEventHandler(FileWatcher_Changed);
                _watcher.Deleted += new FileSystemEventHandler(FileWatcher_Deleted);
                _watcher.Renamed += new RenamedEventHandler(FileWatcher_Renamed);
 
            }
 
            catch (Exception ex)
            {
                Console.WriteLine("Error:" + ex.Message);
            }
        }
 
 
        public void Start()
        {
 
            this._watcher.EnableRaisingEvents = true;
            Console.WriteLine("文件监控已经启动...");
 
        }
 
        public void Stop()
        {
 
            this._watcher.EnableRaisingEvents = false;
            this._watcher.Dispose();
            this._watcher = null;
 
        }
 
        protected void FileWatcher_Created(object sender, FileSystemEventArgs e)
        {
            Console.WriteLine("新增:" + e.ChangeType + ";" + e.FullPath + ";" + e.Name);
 
        }
        protected void FileWatcher_Changed(object sender, FileSystemEventArgs e)
        {
            Console.WriteLine("变更:" + e.ChangeType + ";" + e.FullPath + ";" + e.Name);
        }
        protected void FileWatcher_Deleted(object sender, FileSystemEventArgs e)
        {
            Console.WriteLine("删除:" + e.ChangeType + ";" + e.FullPath + ";" + e.Name);
        }
        protected void FileWatcher_Renamed(object sender, RenamedEventArgs e)
        {
 
            Console.WriteLine("重命名: OldPath:{0} NewPath:{1} OldFileName{2} NewFileName:{3}", e.OldFullPath, e.FullPath, e.OldName, e.Name);
 
        }
 
    }
}