ASP.NET批量下載檔案的方法_實用技巧

本文執行個體講述了ASP.NET批量下載檔案的方法。分享給大家供大家參考。具體方法如下：

一、實現步驟

在使用者操作介面，由使用者選擇需要下載的檔案，系統根據所選檔案，在伺服器上建立用於儲存所選檔案的臨時檔案夾，將所選檔案拷貝至臨時檔案夾。然後調用 RAR程式，對臨時檔案夾進行壓縮，然後輸出到用戶端。最後刪除臨時檔案夾。
 
二、代碼實現
 
1、ASP.NET批量下載 核心代碼

複製代碼 代碼如下:

//遍曆伺服器指定檔案夾下的所有檔案
string path = "uploads/Image/";
string serverPath = Server.MapPath(path);
//建立臨時檔案夾
string tempName = DateTime.Now.ToString("yyyyMMddHHMMss");
string tempFolder = Path.Combine(serverPath, tempName);
Directory.CreateDirectory(tempFolder);
DirectoryInfo folder = new DirectoryInfo(serverPath);
foreach (FileInfo file in folder.GetFiles())
{
 string filename = file.Name;
 File.Copy(serverPath + "/" + filename, tempFolder + "/" + filename);
}
//ZKHelper.JSHelper.Alert("圖片拷貝成功!");
//產生RAR檔案，及檔案輸出
RARSave(tempFolder, tempName);
DownloadRAR(tempFolder + " \\\\" + tempName + ".rar");

 
2、RARSave(string tempFolder, string tempName) 方法

複製代碼 代碼如下:

/// <summary>
/// 產生RAR檔案
/// </summary>
/// <param name="path">存放複製檔案的目錄</param>
/// <param name="rarPatch">RAR檔案存放目錄</param>
/// <param name="rarName">RAR檔案名稱</param>
private void RARSave(string rarPatch, string rarName)
{
    string the_rar;
    RegistryKey the_Reg;
    Object the_Obj;
    string the_Info;
    ProcessStartInfo the_StartInfo;
    Process the_Process;
    try
    {
 the_Reg = Registry.ClassesRoot.OpenSubKey(@"WinRAR");
 the_Obj = the_Reg.GetValue("");
 the_rar = the_Obj.ToString();
 the_Reg.Close();
 the_rar = the_rar.Substring(1, the_rar.Length - 7);
 the_Info = " a " + rarName + " -r";
 the_StartInfo = new ProcessStartInfo();
 the_StartInfo.FileName = "WinRar";//the_rar;
 the_StartInfo.Arguments = the_Info;
 the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
 //打包檔案存放目錄
 the_StartInfo.WorkingDirectory = rarPatch;
 the_Process = new Process();
 the_Process.StartInfo = the_StartInfo;
 the_Process.Start();
 the_Process.WaitForExit();
 the_Process.Close();
    }
    catch (Exception)
    {
 throw;
    }
}

 
3、DownloadRAR(string file)方法

複製代碼 代碼如下:

/// <summary>
/// 下載產生的RAR檔案
/// </summary>
private void DownloadRAR(string file)
{
    FileInfo fileInfo = new FileInfo(file);
    Response.Clear();
    Response.ClearContent();
    Response.ClearHeaders();
    Response.AddHeader("Content-Disposition", "attachment;filename=" + fileInfo.Name);
    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(" \\\\"));
    //刪除臨時目錄下的所有檔案
    DeleteFiles(tempPath);
    //刪除空目錄
    Directory.Delete(tempPath);
    Response.End();
}

4、DeleteFiles(string tempPath) 方法

複製代碼 代碼如下:

/// <summary>
/// 刪除臨時目錄下的所有檔案
/// </summary>
/// <param name="tempPath">臨時目錄路徑</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;
    }
}

希望本文所述對大家的asp.net#程式設計有所協助。