【C#MVC】C#中將文件夾壓縮然后下載

遇到一個需求，因為大量的圖片下載不方便。於是要求下載一個壓縮包。這樣就需要我們將服務器上的文件打包，然后下載。 參數：rootPath -> 將要壓縮的根目錄
設置全局變量，臨時存放文件（files）和空目錄(paths)：

 List<string> files = null;
    List<string> paths = null;
    protected void Page_Load(object sender, EventArgs e)
    {
         files = new List<string>();//初始化
         paths = new List<string>();//初始化
    }

private void GetAllDirectories(string rootPath)
    {
        string[] subPaths = Directory.GetDirectories(rootPath);//得到所有子目錄  
        foreach (string path in subPaths)
        {
            GetAllDirectories(path);//對每一個字目錄做與根目錄相同的操作：即找到子目錄並將當前目錄的文件名存入List  
        }
        string[] files = Directory.GetFiles(rootPath);//得到當前目錄下的文件
        foreach (string file in files)
        {
            this.files.Add(file);//將當前目錄中的所有文件全名存入文件List  
        }
        if (subPaths.Length == files.Length && files.Length == 0)//如果是空目錄  
        {
            this.paths.Add(rootPath);//記錄空目錄  
        }
    }

2.壓縮文件 destinationPath -> 壓縮文件的存放目錄+文件名（新建一個臨時目錄，下載之后即可清楚，減輕服務器壓力）
compressLevel -> 壓縮成度（0-9）

 public void ZipFileFromDirectory(string rootPath, string destinationPath, int compressLevel)
    {
        GetAllDirectories(rootPath); //獲取所有文件和空目錄

    //作用：便於我們找到的解壓相對路徑。
        while (rootPath.LastIndexOf("/") + 1 == rootPath.Length)//檢查路徑是否以"\"結尾 
        {
            rootPath = rootPath.Substring(0, rootPath.Length - 1);//如果是則去掉末尾的"\" 
        }

        string rootMark = rootPath.Substring(0, rootPath.LastIndexOf("/") + 1);//得到當前路徑的位置，以備壓縮時將所壓縮內容轉變成相對路徑。  
         //rootMark = rootMark + "/";//得到當前路徑的位置，以備壓縮時將所壓縮內容轉變成相對路徑。  
        Crc32 crc = new Crc32();
        ZipOutputStream outPutStream = new ZipOutputStream(File.Create(destinationPath+".zip"));
        outPutStream.SetLevel(compressLevel); // 0 - store only to 9 - means best compression  
        foreach (string file in files)
        {
            FileStream fileStream = File.OpenRead(file);//打開壓縮文件  
            byte[] buffer = new byte[fileStream.Length];
            fileStream.Read(buffer, 0, buffer.Length);
            ZipEntry entry = new ZipEntry(file.Replace(rootMark, string.Empty));
            entry.DateTime = DateTime.Now;
            // set Size and the crc, because the information  
            // about the size and crc should be stored in the header  
            // if it is not set it is automatically written in the footer.  
            // (in this case size == crc == -1 in the header)  
            // Some ZIP programs have problems with zip files that don't store  
            // the size and crc in the header.  
            entry.Size = fileStream.Length;
            fileStream.Close();
            crc.Reset();
            crc.Update(buffer);
            entry.Crc = crc.Value;
            outPutStream.PutNextEntry(entry);
            outPutStream.Write(buffer, 0, buffer.Length);
        }

        this.files.Clear();

        foreach (string emptyPath in paths)
        {
            ZipEntry entry = new ZipEntry(emptyPath.Replace(rootMark, string.Empty) + "/");
            outPutStream.PutNextEntry(entry);
        }
        this.paths.Clear();
        outPutStream.Finish();
        outPutStream.Close();
        GC.Collect();
    }

3.下載壓縮文件
參數：fileRpath -> 壓縮文件所在目錄+壓縮文件名+”.zip”

public void DownloadFile(string fileRpath)
{
        Response.ClearHeaders();
        Response.Clear();
        Response.Expires = 0;
        Response.Buffer = true;
        Response.AddHeader("Accept-Language", "zh-tw");
        string name = System.IO.Path.GetFileName(fileRpath);
        System.IO.FileStream files = new FileStream(fileRpath, FileMode.Open, FileAccess.Read, FileShare.Read);
        byte[] byteFile = null;
        if (files.Length == 0)
        {
            byteFile = new byte[1];
        }
        else
        {
            byteFile = new byte[files.Length];
        }
        files.Read(byteFile, 0, (int)byteFile.Length);
        files.Close();
        Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(name, System.Text.Encoding.UTF8));
        Response.ContentType = "application/octet-stream;charset=gbk";
        Response.BinaryWrite(byteFile);
        Response.End();

}

4.調用並清空緩存：

  protected void btnDownload_Click(object sender, EventArgs e)
    {
        try 
        {
            string filePathtmp = ConfigurationManager.AppSettings["xxx"].ToString().Trim();
            string destinationPath = ConfigurationManager.AppSettings["sss"].ToString().Trim();
            if (!Directory.Exists(destinationPath))
            {
                Directory.CreateDirectory(destinationPath);
            }
            string testFileName = txtBagNumber.Text.Trim();
            if (!Directory.Exists(filePathtmp + testFileName +"/"))
            {
                throw new Exception("No Files!");
            }
            ZipFileFromDirectory(filePathtmp + testFileName + "/", destinationPath + testFileName , 8);
            DownloadFile(destinationPath + testFileName + ".zip");
            Directory.Delete(destinationPath, true); //清空
        }
        catch (Exception ex)
        {
            lblError.Text = ex.Message;
        }
    }

5.引用DLL：
添加引用：

using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip;

下載路徑：
http://download.csdn.net/detail/f627422467/9706814