Asp.net直接保存文件到客戶端

     通常的文件下載是用跳出窗口實現的，但是有個問題,就是會被廣告攔截軟件直接攔截掉,另我非常的頭痛,於是尋找更好的解決方法.看了用Response.BinaryWrite寫文件流一文之後覺得確實可以如此。 如下代碼實現了此功能，解決了文件格式問題（就是隻將流輸出，但無法正確識別文件格式），並且從註冊表讀取文件的ContentType 。

 1 ''' <summary>
2 ''' 下載文件
3 ''' </summary>
4 ''' <param name="filename">文件物理地址</param>
5 Protected  Sub DownloadFile()Sub DownloadFile(ByVal filename As String)
6
7Dim saveFileName As String =  "test.xls"
8Dim intStart As Integer =  filename.LastIndexOf("//")+1
9 saveFileName = filename.Substring(intStart,filename.Length-intStart)
10
11Dim fi As System.IO.FileInfo = New System.IO.FileInfo(filename)
12Dim fileextname As String = fi.Extension
13Dim DEFAULT_CONTENT_TYPE As String =  "application/unknown"
14Dim regkey As RegisTryKey,fileextkey As RegisTryKey
15Dim filecontenttype As String
16Try
17 regkey=RegisTry.ClassesRoot
18 fileextkey=regkey.OpenSubKey(fileextname)
19 filecontenttype=fileextkey.GetValue("Content Type",DEFAULT_CONTENT_TYPE).ToString()
20Catch
21 filecontenttype=DEFAULT_CONTENT_TYPE
22End Try
23
24
25 Response.Clear()
26 Response.Charset = "utf-8"
27 Response.Buffer= True
28Me.EnableViewState = False
29 Response.ContentEncoding = System.Text.Encoding.UTF8
30
31 Response.AppendHeader("Content-Disposition","attachment;filename=" + saveFileName)
32 Response.ContentType=filecontenttype
33
34 Response.WriteFile(filename)
35 Response.Flush()
36 Response.Close()
37
38 Response.End()
39End Sub

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