asp.net|用戶端 通常的檔案下載是用跳出視窗實現的,但是有個問題,就是會被廣告攔截軟體直接攔截掉,另我非常的頭痛,於是尋找更好的解決方案.看了用Response.BinaryWrite寫檔案流一文之後覺得確實可以如此。
如下代碼實現了此功能,解決了檔案格式問題(就是只將流輸出,但無法正確識別檔案格式),並且從註冊表讀取檔案的ContentType
1 /**//// <summary>
2 /// 下載檔案
3 /// </summary>
4 /// <param name="filename">檔案物理地址</param>
5 protected void DownloadFile(string filename)
6 {
7
8 string saveFileName = "test.xls";
9 int intStart = filename.LastIndexOf("\\")+1;
10 saveFileName = filename.Substring(intStart,filename.Length-intStart);
11
12 System.IO.FileInfo fi=new System.IO.FileInfo(filename);
13 string fileextname=fi.Extension;
14 string DEFAULT_CONTENT_TYPE = "application/unknown";
15 RegistryKey regkey,fileextkey;
16 string filecontenttype;
17 try
18 {
19 regkey=Registry.ClassesRoot;
20 fileextkey=regkey.OpenSubKey(fileextname);
21 filecontenttype=fileextkey.GetValue("Content Type",DEFAULT_CONTENT_TYPE).ToString();
22 }
23 catch
24 {
25 filecontenttype=DEFAULT_CONTENT_TYPE;
26 }
27
28
29 Response.Clear();
30 Response.Charset = "utf-8";
31 Response.Buffer= true;
32 this.EnableViewState = false;
33 Response.ContentEncoding = System.Text.Encoding.UTF8;
34
35 Response.AppendHeader("Content-Disposition","attachment;filename=" + saveFileName);
36 Response.ContentType=filecontenttype;
37
38 Response.WriteFile(filename);
39 Response.Flush();
40 Response.Close();
41
42 Response.End();
43 }
效果圖如下: