asp.net中中文乱码问题

asp.net默认的编码为utf-8，当与其它平台交互处理的字符串中有中文时往往会出现乱码，这是由于其它平台多采取GB2312编码，要解决这一问题，可编写一个函数，对字符串先转换再处理就行了，下面是该函数的源代码：

Imports System.Math
Function URLEncoding(ByVal vstrIn As String)
   Dim strReturn As String
   strReturn = ""
   Dim i As Integer
   Dim ThisChr As String
   Dim innerCode, Hight8, Low8 As Integer
   For i = 1 To vstrIn.Length
       ThisChr = Mid(vstrIn, i, 1)
          If Abs(Asc(ThisChr)) < &HFF Then
                strReturn = strReturn & ThisChr
          Else
                 innerCode = Asc(ThisChr)
           If innerCode < 0 Then
                innerCode = innerCode + &H10000
           End If
           Hight8 = (innerCode And &HFF00) / &HFF
           Low8 = innerCode And &HFF
           strReturn = strReturn & "%" & Hex(Hight8) & "%" & Hex(Low8)
      End If
 Next
 URLEncoding = strReturn
End Function

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