ASP.NET 實現PDF檔案下載
阿新 • • 發佈:2019-01-03
1 protected void Button1_Click(object sender, EventArgs e)
2 {
3 string path;
4 try
5 {
6 path = Request.PhysicalApplicationPath + "/" + Session["pdfpath"].ToString() + "/PDF/" + Session["mlmc"].ToString() + ".pdf";
7 }
8 catch (Exception)
9 {
10 return;
11 }
12 System.IO.Stream iStream = null;
13 byte[] buffer = new Byte[10000];
14 int length;
15 long dataToRead;
16 string filename = Session["mlmc"].ToString() + ".pdf";
17
18 try
19 {
20 iStream = new System.IO.FileStream(path, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
21 dataToRead = iStream.Length;
22 Response.Clear();
23 Response.ClearHeaders();
24 Response.ClearContent();
25 Response.ContentType = "application/pdf"; //檔案型別
26 Response.AddHeader("Content-Length", dataToRead.ToString());//新增檔案長度,進而顯示進度
27 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8));
28 while (dataToRead > 0)
29 {
30 if (Response.IsClientConnected)
31 {
32 length = iStream.Read(buffer, 0, 10000);
33 Response.OutputStream.Write(buffer, 0, length);
34 Response.Flush();
35
36 buffer = new Byte[10000];
37 dataToRead = dataToRead - length;
38 }
39 else
40 {
41 dataToRead = -1;
42 }
43 }
44
45 }
46 catch (Exception ex)
47 {
48 Response.Write("檔案下載時出現錯誤!");
49 }
50 finally
51 {
52 if (iStream != null)
53 {
54 iStream.Close();
55 }
56 //結束響應,否則將導致網頁內容被輸出到檔案,進而檔案無法開啟
57 Response.End();
58 }
59 }
通過以上程式碼,可在瀏覽器中開啟一個“開啟/儲存”對話方塊來下載並儲存檔案。
通過以上程式碼,可在瀏覽器中開啟一個“開啟/儲存”對話方塊來下載並儲存檔案。