关于URI类构造函数对字符串编码的有关问题

关于URI类构造函数对字符串编码的问题
Dim   uriString   As   String
Dim   instance   As   New   Uri(uriString)


uriString中如果有字符是中文,对该字符构造函数默认的编码方法是UTF-8.
我想问下,这个UTF-8能通过属性修改吗?比如我想让URI类默认用GB2312编码.

现在我用个比较笨的方法对uriString进行循环遍历,逐个字符进行判断是不是中文,然后在对中文进行GB2312编码,处理完的uriString再放进URI构造函数中,感觉这样效率不太好.要是上面说的UTF-8能被替换就好了.

------解决方案--------------------
Public Function URLEncode(ByRef strEnc As String) As String

'在.net中使用myWebClient.DownloadData方法提交含有中文网址的url前，进行编码
Dim strTmp2, strChar, strTmp, strRet As String
Dim lngLoop As Integer
For lngLoop = 0 To strEnc.Length - 1
strChar = strEnc.Substring(lngLoop, 1)
Select Case Asc(strChar)
Case 48 To 57, 65 To 90, 97 To 122
strRet &= strChar
Case 32
strRet &= "+ "
Case Else
strTmp = Hex(Asc(strChar))
If strTmp.Length > 4 Then strTmp = strTmp.Substring(4)
strRet &= "% " & strTmp.Substring(0, 2)
If strTmp.Length > 2 Then
strTmp2 = strTmp.Substring(2)
strRet &= IIf(IsNumeric(strTmp.Substring(2, 1)), Chr(Val( "&H " & strTmp2)), "% " & strTmp2)
End If
End Select
Next
URLEncode = strRet
End Function