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ASP.NET 實現PDF檔案下載

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。