ASP.NET 檔案下載代碼
來源:互聯網
上載者:User
1 public static void DownLoad(Page page, string FileName)
2 {
3 try
4 {
5 System.IO.FileStream r = new System.IO.FileStream(FileName, System.IO.FileMode.Open);
6 //設定基本資料
7 page.Response.Buffer = false;
8 page.Response.AddHeader("Connection", "Keep-Alive");
9 page.Response.ContentType = "application/octet-stream";
10 page.Response.AddHeader("Content-Disposition", "attachment;filename=" + System.IO.Path.GetFileName(FileName));
11 page.Response.AddHeader("Content-Length", r.Length.ToString());
12 while (true)
13 {
14 //開闢緩衝區空間
15 byte[] buffer = new byte[1024];
16 //讀取檔案的資料
17 int leng = r.Read(buffer, 0, 1024);
18 if (leng == 0)//到檔案尾,結束
19 break;
20 if (leng == 1024)//讀出的檔案資料長度等於緩衝區長度,直接將緩衝區資料寫入
21 page.Response.BinaryWrite(buffer);
22 else
23 {
24 //讀出檔案資料比緩衝區小,重新定義緩衝區大小,只用於讀取檔案的最後一個資料區塊
25 byte[] b = new byte[leng];
26 for (int i = 0; i < leng; i++)
27 b[i] = buffer[i];
28 page.Response.BinaryWrite(b);
29 break;
30 }
31 }
32 r.Close();//關閉下載檔案
33 HttpContext.Current.ApplicationInstance.CompleteRequest();//結束檔案下載
34 page.Response.Flush();
35 page.Response.Close();
36 }
37 catch (System.Exception ex)
38 {
39 throw ex;
40 }
41 }