將指定文件夾多個文件壓縮為一個zip

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;

using System.IO;
using System.Data;

using ICSharpCode.SharpZipLib;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.Zip.Compression;
using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
using ICSharpCode.SharpZipLib.Checksums;

/**//// <summary>
/// Summary description for zip
/// </summary>
public class zip
{
    public zip()
    {
        //
        // TODO: Add constructor logic here
        //
    }
   
    public void UnZip( string strFile, string strDir ) 
        {
            说明#region 说明
            /**////
            /// 功能：将一个压缩文件解压缩到一个目录下
            /// 
            /// 参数：
            ///   strFile:压缩文件
            ///   strDir:解压缩目录
            /// 
            /// 返回：
            ///   无
            ///
            #endregion
            if (strDir == "")    strDir = Directory.GetCurrentDirectory();
            if (!strDir.EndsWith(@"\"))    strDir = strDir + @"\";

            ZipInputStream s = new ZipInputStream(File.OpenRead(strFile));
            ZipEntry theEntry;

            while ((theEntry = s.GetNextEntry()) != null) 
            {
                string directoryName = "";
                string pathToZip = "";
                pathToZip = theEntry.Name;

                if (pathToZip != "")
                    directoryName = Path.GetDirectoryName(pathToZip) + @"\";
                string fileName = Path.GetFileName(pathToZip);
                Directory.CreateDirectory(strDir + directoryName);
                if (fileName != "") 
                {
                    FileStream streamWriter = File.Create(strDir + directoryName + fileName);
                    int size = 2048;
                    byte[] data = new byte[2048];
                    while (true) 
                    {
                        size = s.Read(data, 0, data.Length);
                        if (size > 0) 
                            streamWriter.Write(data, 0, size);
                        else 
                            break;
                    }
                    streamWriter.Close();
                }
            }
            s.Close();
        }

    //壓縮指定目錄的多個文件夾到一個壓縮文件
    public string  ZipMultiFile(string ZipFromFileDictory, string ZiptoFileName)
    {
        string[] strFiles = Directory.GetFiles(ZipFromFileDictory);
        string strPhysicalPath = ZiptoFileName;
        string strZipFileName = strPhysicalPath + ".zip";

        if (File.Exists(strZipFileName))
        {
            File.Delete(strZipFileName);
        }

        //需壓縮的文件個數
        string[] strFilePaths = new string[strFiles.Length];

        MemoryStream oMemoryStream = new MemoryStream();

        ZipOutputStream oZipStream = new ZipOutputStream(File.Create(strZipFileName));

        try
        {

            for (int i = 0; i <= strFiles.Length - 1; i++)
            {
                Read File Data To Stream#region Read File Data To Stream

                FileStream oReadFileStream = File.OpenRead(strFiles[i]);
                byte[] btFile = new byte[oReadFileStream.Length];
                oReadFileStream.Read(btFile, 0, btFile.Length);

                #endregion

                string strCurrentFileName = Path.GetFileName(strFiles[i]);
                strFilePaths[i] = strPhysicalPath + "/" + strCurrentFileName;



                ZipEntry oZipEntry = new ZipEntry(strCurrentFileName);

                oZipEntry.DateTime = DateTime.Now;
                oZipEntry.Size = oReadFileStream.Length;

                Crc32 oCrc32 = new Crc32();
                oCrc32.Reset();
                oCrc32.Update(btFile);


                oZipEntry.Crc = oCrc32.Value;

                oZipStream.PutNextEntry(oZipEntry);
                oZipStream.Write(btFile, 0, btFile.Length);

                //Stream Close
                oReadFileStream.Close();
            }

            oZipStream.Finish();
            oZipStream.Close();

            return "A";
        }
        catch (Exception ex)
        {
            oZipStream.Finish();
            oZipStream.Close();
            return "Error" + ex.Message;
        }
       

    }

}

壓縮控件：sharpziplib.zip