【C#MVC】C#中将文件夹压缩然后下载

遇到一个需求，因为大量的图片下载不方便。于是要求下载一个压缩包。这样就需要我们将服务器上的文件打包，然后下载。 参数：rootPath -> 将要压缩的根目录

设置全局变量，临时存放文件（files）和空目录(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);//得到所有子目录  
        foreach (string path in subPaths)
        {
            GetAllDirectories(path);//对每一个字目录做与根目录相同的操作：即找到子目录并将当前目录的文件名存入List  
        }
        string[] files = Directory.GetFiles(rootPath);//得到当前目录下的文件
        foreach (string file in files)
        {
            this.files.Add(file);//将当前目录中的所有文件全名存入文件List  
        }
        if (subPaths.Length == files.Length && files.Length == 0)//如果是空目录  
        {
            this.paths.Add(rootPath);//记录空目录  
        }
    }

2.压缩文件 destinationPath -> 压缩文件的存放目录+文件名（新建一个临时目录，下载之后即可清楚，减轻服务器压力）

compressLevel -> 压缩成度（0-9）

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

    //作用：便于我们找到的解压相对路径。
        while (rootPath.LastIndexOf("/") + 1 == rootPath.Length)//检查路径是否以"\"结尾 
        {
            rootPath = rootPath.Substring(0, rootPath.Length - 1);//如果是则去掉末尾的"\" 
        }

        string rootMark = rootPath.Substring(0, rootPath.LastIndexOf("/") + 1);//得到当前路径的位置，以备压缩时将所压缩内容转变成相对路径。  
         //rootMark = rootMark + "/";//得到当前路径的位置，以备压缩时将所压缩内容转变成相对路径。  
        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);//打开压缩文件  
            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.下载压缩文件

参数：fileRpath -> 压缩文件所在目录+压缩文件名+”.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.调用并清空缓存：

  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;

下载路径：

http://download.csdn.net/detail/f627422467/9706814