.net中下載文件的方法(轉)

.net中下載文件的方法

1、//TransmitFile實現下載      protected void Button1_Click(object sender, EventArgs e)      {          /*          微軟爲Response對象提供了一個新的方法TransmitFile來解決使用Response.BinaryWrite          下載超過400mb的文件時致使Aspnet_wp.exe進程回收而沒法成功下載的問題。          代碼以下：          */          Response.ContentType = "application/x-zip-compressed";          Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");          string filename = Server.MapPath("DownLoad/z.zip");          Response.TransmitFile(filename);      }

2、//WriteFile實現下載      protected void Button2_Click(object sender, EventArgs e)      {          /*          using System.IO;

         */          string fileName = "asd.txt";//客戶端保存的文件名          string filePath = Server.MapPath("DownLoad/aaa.txt");//路徑

         FileInfo fileInfo = new FileInfo(filePath);          Response.Clear();          Response.ClearContent();          Response.ClearHeaders();          Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);          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();          Response.End();      }

3、    //WriteFile分塊下載      protected void Button3_Click(object sender, EventArgs e)      {          string fileName = "aaa.txt";//客戶端保存的文件名          string filePath = Server.MapPath("DownLoad/aaa.txt");//路徑

         System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);

         if (fileInfo.Exists == true)          {              const long ChunkSize = 102400;//100K 每次讀取文件，只讀取100K，這樣能夠緩解服務器的壓力              byte[] buffer = new byte[ChunkSize];

             Response.Clear();              System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);              long dataLengthToRead = iStream.Length;//獲取下載的文件總大小              Response.ContentType = "application/octet-stream";              Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));              while (dataLengthToRead > 0 && Response.IsClientConnected)              {                  int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//讀取的大小                  Response.OutputStream.Write(buffer, 0, lengthRead);                  Response.Flush();                  dataLengthToRead = dataLengthToRead - lengthRead;              }              Response.Close();          }      }

4、//流方式下載      protected void Button4_Click(object sender, EventArgs e)      {          string fileName = "aaa.txt";//客戶端保存的文件名          string filePath = Server.MapPath("DownLoad/aaa.txt");//路徑

         //以字符流的形式下載文件          FileStream fs = new FileStream(filePath, FileMode.Open);          byte[] bytes = new byte[(int)fs.Length];          fs.Read(bytes, 0, bytes.Length);          fs.Close();          Response.ContentType = "application/octet-stream";          //通知瀏覽器下載文件而不是打開          Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));          Response.BinaryWrite(bytes);          Response.Flush();          Response.End();      }

 

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public void DownloadFile( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FileBody ) {

　　WebForm.Response.ClearHeaders(); 　　WebForm.Response.Clear(); 　　WebForm.Response.Expires = 0; 　　WebForm.Response.Buffer = true; 　　WebForm.Response.AddHeader("Accept-Language", "zh-tw"); 　　//'文件名稱 　　WebForm.Response.AddHeader("content-disposition", "attachment; filename='"+System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8)+"'"); 　　WebForm.Response.ContentType = "Application/octet-stream"; 　　//'文件內容 　　WebForm.Response.Write(FileBody);//-----------      WebForm.Response.End(); }

//上面這段代碼是下載一個動態產生的文本文件，若這個文件已經存在於服務器端的實體路徑，則能夠經過下面的函數：

public void DownloadFileByFilePath( System.Web.UI.Page WebForm,String FileNameWhenUserDownload ,String FilePath ) { 　　WebForm.Response.ClearHeaders(); 　　WebForm.Response.Clear(); 　　WebForm.Response.Expires = 0;      WebForm.Response.Buffer = true; 　　WebForm.Response.AddHeader("Accept-Language", "zh-tw"); 　　//文件名稱 　　WebForm.Response.AddHeader("content-disposition", "attachment; filename='" + System.Web.HttpUtility.UrlEncode(FileNameWhenUserDownload, System.Text.Encoding.UTF8) +"'" ); 　　WebForm.Response.ContentType = "Application/octet-stream"; 　　//文件內容 　　WebForm.Response.Write(System.IO.File.Rea}dAllBytes(FilePath));//--------- 　　WebForm.Response.End();

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