小记：这套代码还是有点小bug的，只好用凑合用吧~~ bug1：当有重复文件的时候，会在服务器弹出是否覆盖的窗口，所以，解压的时候，切勿重名目录。bug2：就是压缩的时候，同理，也不要有重名的。还有就是，开始的时候，自己建立一个zip，然后copy一个出来，再去添加到里面，整体思路就是这样，反正能凑合用。呵呵~~

代码如下。。也是从网上copy的，然后自己改改~~

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
    public string doSay = "err";
    protected void Page_Load(object sender, EventArgs e)
    {
        doSay = Server.MapPath("zzcn.net.zip");
       
       
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string err;
        if (UnZipFile(Server.MapPath("zzcn.net.zip"), Server.MapPath("zzcn.net"), out err))
        {
            doSay = "解压成功！";
        }
    }

    #region 解压zip格式的文件
    /// <summary>
        /// 功能：解压zip格式的文件。
        /// </summary>
        /// <param name="zipFilePath">压缩文件路径</param>
        /// <param name="unZipDir">解压文件存放路径,为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹</param>
        /// <param name="err">出错信息</param>
        /// <returns>解压是否成功</returns>
        public bool UnZipFile(string zipFilePath, string unZipDir, out string err)
        {
            err = "";
            if (zipFilePath.Length == 0)
            {
                err = "压缩文件不能为空！";
                return false;
            }
            else if (!zipFilePath.EndsWith(".zip"))
            {
                err = "文件格式不正确！";
                return false;
            }
            else if (!System.IO.File.Exists(zipFilePath))
            {
                err = "压缩文件不存在！";
                return false;
            }
            //解压文件夹为空时默认与压缩文件同一级目录下，跟压缩文件同名的文件夹
            if (unZipDir.Length == 0)
                unZipDir = zipFilePath.Replace(System.IO.Path.GetFileName(zipFilePath), System.IO.Path.GetFileNameWithoutExtension(zipFilePath));
            if (!unZipDir.EndsWith("\\"))
                unZipDir += "\\";
            if (!System.IO.Directory.Exists(unZipDir))
                System.IO.Directory.CreateDirectory(unZipDir);
            try
            {
                Shell32.ShellClass sc = new Shell32.ShellClass();
                Shell32.Folder SrcFolder = sc.NameSpace(zipFilePath);
                Shell32.Folder DestFolder = sc.NameSpace(unZipDir);
                Shell32.FolderItems items = SrcFolder.Items();
                DestFolder.CopyHere(items, 20);
            }
            catch (Exception ex)
            {
                err = ex.Message;
                return false;
            }
            return true;
        }//解压结束
        #endregion

    public bool BuildFrame(string srcFile, string destFolder)
    {
        try
        {
            Shell32.ShellClass sc = new Shell32.ShellClass();
            Shell32.Folder SrcFolder = sc.NameSpace(srcFile);
            Shell32.Folder DestFolder = sc.NameSpace(destFolder);
            Shell32.FolderItems items = SrcFolder.Items();
            DestFolder.CopyHere(items, 20);
            return true;
        }
        catch
        {
            return false;
        }
    }

    public bool YaSuo(string DeskFolder, string objFile)
    {
        try
        {
            Shell32.ShellClass sc = new Shell32.ShellClass();
            Shell32.Folder SrcFolder = sc.NameSpace(DeskFolder);
            Shell32.Folder DestFolder = sc.NameSpace(objFile);
            Shell32.FolderItems items = SrcFolder.Items();
            DestFolder.CopyHere(items, 20);
            return true;
        }
        catch
        {
            return false;
        }
    }

    protected void Button2_Click(object sender, EventArgs e)
    {
        if (YaSuo(Server.MapPath("zz"), Server.MapPath("zz1.zip")))
        {
            doSay = "压缩完毕！欢迎访问 t.sina.com.cn/pengchenggang";
        }
    }
}