4種 ASP.NET檔案下載

Description:

4種 ASP.NET檔案下載

//TransmitFile實現下載
    protectedvoid
Button1_Click(object sender, EventArgs e)
   
{
       

       Response.ContentType =
"application/x-zip-compressed";
       Response.AddHeader("Content-Disposition","attachment;filename=z.zip");
       string
filename =
Server.MapPath("DownLoad/z.zip");
       Response.TransmitFile(filename);
   
}

   //WriteFile實現下載
   
protectedvoid Button2_Click(object sender, EventArgs e)
   
{
       

       string fileName
= "asd.txt";//用戶端儲存的檔案名稱
       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();
   
}

   //WriteFile分塊下載
   
protectedvoid Button3_Click(object sender, EventArgs e)
   
{

       string fileName
= "aaa.txt";//用戶端儲存的檔案名稱
       string
filePath =Server.MapPath("DownLoad/aaa.txt");//路徑

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

       if
(fileInfo.Exists ==
true)
       {
           const
long ChunkSize =
102400;//100K每次讀取檔案，唯讀取100Ｋ，這樣可以緩解伺服器的壓力
           byte[]
buffer = new byte[ChunkSize];

           Response.Clear();
           System.IO.FileStream
iStream
=System.IO.File.OpenRead(filePath);
           long
dataLengthToRead =
iStream.Length;//擷取下載的檔案總大小
           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();
       }
   
}

   //流方式下載
   
protectedvoid Button4_Click(object sender, EventArgs e)
   
{
       string fileName =
"aaa.txt";//用戶端儲存的檔案名稱
       string
filePath =Server.MapPath("DownLoad/aaa.txt");//路徑

       //以字元流的形式下載檔案
       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";
       //通知瀏覽器下載檔案而不是開啟
       Response.AddHeader("Content-Disposition","attachment; 
filename=" +HttpUtility.UrlEncode(fileName,
System.Text.Encoding.UTF8));
       Response.BinaryWrite(bytes);
       Response.Flush();
       Response.End();

   }