封装原来的DirectoryInfo类，添加事件，可以代替FileSystemWatcher 类

using System;
using System.IO;

//封装原来的DirectoryInfo类，添加事件，可以代替FileSystemWatcher 类
public class DirectoryInfoNotify
{
    public DirectoryInfoNotify(string path)
    {
        internalDirInfo = new DirectoryInfo(path);
    }
    
    private DirectoryInfo internalDirInfo = null;
    public event EventHandler AfterCreate;
    public event EventHandler AfterCreateSubDir;
    public event EventHandler AfterDelete;
    public event EventHandler AfterMoveTo;
    protected virtual void OnAfterCreate()
    {
        EventHandler afterCreate = AfterCreate;
        if (afterCreate != null)
        {
            
            afterCreate(this, new EventArgs());
        }
    }

    protected virtual void OnAfterCreateSubDir()
    {
        EventHandler afterCreateSubDir = AfterCreateSubDir;
        if (afterCreateSubDir != null)
        {
            afterCreateSubDir(this, new EventArgs());
        }
    }

    protected virtual void OnAfterDelete()
    {
        EventHandler afterDelete = AfterDelete;
        if (afterDelete != null)
        {
            afterDelete(this, new EventArgs());
        }
    }

    protected virtual void OnAfterMoveTo()
    {
        EventHandler afterMoveTo = AfterMoveTo;
        if (afterMoveTo != null)
        {
            afterMoveTo(this, new EventArgs());
        }
    }

    // Event firing members
    //激活事件的方法
    public void Create()
    {
        
        internalDirInfo.Create();
        OnAfterCreate();
    }

    public DirectoryInfoNotify CreateSubdirectory(string path)
    {
        DirectoryInfo subDirInfo = internalDirInfo.CreateSubdirectory(path);
        OnAfterCreateSubDir();

        return (new DirectoryInfoNotify(subDirInfo.FullName));
    }

    public void Delete(bool recursive)
    {
        internalDirInfo.Delete(recursive);
        OnAfterDelete();
    }

    public void Delete()
    {
        internalDirInfo.Delete();
        OnAfterDelete();
    }

    public void MoveTo(string destDirName)
    {
        internalDirInfo.MoveTo(destDirName);
        OnAfterMoveTo();
    }

    // Nonevent firing members
    public string FullName
    {
        get { return (internalDirInfo.FullName); }
    }
    public string Name
    {
        get { return (internalDirInfo.Name); }
    }
    public DirectoryInfoNotify Parent
    {
        get { return (new DirectoryInfoNotify(internalDirInfo.Parent.FullName)); }
    }
    public DirectoryInfoNotify Root
    {
        get { return (new DirectoryInfoNotify(internalDirInfo.Root.FullName)); }
    }

    public override string ToString()
    {
        return (internalDirInfo.ToString());
    }
}