ASP.NET 打包下载文件

using ICSharpCode.SharpZipLib.Zip;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
// 打包下载某文件夹里的所有文件

//需要打包的文件夹
string path = "UploadImage/Images/";
string serverPath = Server.MapPath(path);

//创建临时文件夹
string tempName = DateTime.Now.ToString("yyyyMMddHHMMss");
string tempFolder = Path.Combine(serverPath, tempName);
Directory.CreateDirectory(tempFolder);

//遍历文件夹中所有的文件到临时文件夹中
DirectoryInfo folder = new DirectoryInfo(serverPath);
foreach (FileInfo file in folder.GetFiles())
{
string filename = file.Name;
File.Copy(serverPath + "/" + filename, tempFolder + "/" + filename);
}

//压缩文件
compressFiles(tempFolder, tempFolder + "\\\\" + tempName + ".rar");
//下载文件
// DownloadRAR(tempFolder + "\\\\" + tempName + ".rar", "这里下载文件重命名后的名称");

//某些文件打包下载
DownLodeSum();

}

/// <summary>
/// 某些文件打包下载
/// </summary>
public void DownLodeSum()
{
//临时文件夹所在目录
string path = "UploadImage/";
string serverPath = Server.MapPath(path);

//创建临时文件夹
string tempName = DateTime.Now.ToString("yyyyMMddHHMMss");
string tempFolder = Path.Combine(serverPath, tempName);
Directory.CreateDirectory(tempFolder);

//复制需要压缩的文件到临时文件夹中
File.Copy(Server.MapPath("UploadImage/Images/bg-b.png"), Server.MapPath(path + tempName + "/bg-b.png"));
File.Copy(Server.MapPath("UploadImage/Images/bg-j.png"), Server.MapPath(path + tempName + "/bg-j.png"));
File.Copy(Server.MapPath("UploadImage/Images/icon-cart.png"), Server.MapPath(path + tempName + "/icon-cart.png"));

//压缩文件
compressFiles(tempFolder, tempFolder + "\\\\" + tempName + ".rar");
//下载文件
DownloadRAR(tempFolder + "\\\\" + tempName + ".rar", "这里下载文件重命名后的名称");

}

/// <summary>
/// 压缩文件
/// </summary>
/// <param name="dir">文件目录</param>
/// <param name="zipfilename">zip文件名</param>
public static void compressFiles(string dir, string zipfilename)
{
if (!Directory.Exists(dir))
{
return;
}
try
{
string[] filenames = Directory.GetFiles(dir);
using (ZipOutputStream s = new ZipOutputStream(File.Create(zipfilename)))
{

s.SetLevel(9); // 0 - store only to 9 - means best compression

byte[] buffer = new byte[4096];

foreach (string file in filenames)
{
ZipEntry entry = new ZipEntry(Path.GetFileName(file));
entry.DateTime = DateTime.Now;
s.PutNextEntry(entry);
using (FileStream fs = File.OpenRead(file))
{
int sourceBytes;
do
{
sourceBytes = fs.Read(buffer, 0, buffer.Length);
s.Write(buffer, 0, sourceBytes);
} while (sourceBytes > 0);
}
}
s.Finish();
s.Close();
}
}
catch
{

}
}

/// <summary>
/// 下载生成的RAR文件
/// </summary>
private void DownloadRAR(string file, string name)
{
FileInfo fileInfo = new FileInfo(file);
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.AddHeader("Content-Disposition", "attachment;filename=" + name + ".rar");
Response.AddHeader("Content-Length", fileInfo.Length.ToString());
Response.AddHeader("Content-Transfer-Encoding", "binary");
Response.ContentType = "application/octet-stream";
Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
Response.WriteFile(fileInfo.FullName);
Response.Flush();
string tempPath = file.Substring(0, file.LastIndexOf("\\\\"));
//删除临时目录下的所有文件
DeleteFiles(tempPath);
//删除空目录
Directory.Delete(tempPath);
Response.End();
}

/// <summary>
/// 删除临时目录下的所有文件
/// </summary>
/// <param name="tempPath">临时目录路径</param>
private void DeleteFiles(string tempPath)
{
DirectoryInfo directory = new DirectoryInfo(tempPath);
try
{
foreach (FileInfo file in directory.GetFiles())
{
if (file.Attributes.ToString().IndexOf("ReadOnly") != -1)
{
file.Attributes = FileAttributes.Normal;
}
File.Delete(file.FullName);
}
}
catch (Exception)
{
throw;
}
}
}