求教vb.net utf-8 解码

请教如何将这个utf8编码:%E9%80%81%E8%BE%BE%E6%97%A5%E6%9C%9F%20%E9%80%81%E8%BE%BE%E6%97%B6%E9%97%B4
解码出来的中文为：送达日期 送达时间

请教vb.net 代码 谢谢

Public Function GBKDecode(ByVal sInput As String) As String
sInput = sInput.Replace("%", "")
sInput = sInput.Replace(":", "")
Dim ret_GBKDecode As String = ""
Dim sLen As Integer = sInput.Length
Dim n As Integer = sLen \ 2
Dim sBytes(0 To n - 1) As Byte
'转化为字节码
For i As Integer = 1 To n
sBytes(i - 1) = CByte("&H" & sInput.Substring(2 * i - 2, 2))
Next
'将字节码转化为字符串
ret_GBKDecode = System.Text.Encoding.UTF8.GetString(sBytes)
Return ret_GBKDecode
End Function
'上面是函数，调用方法
MsgBox(GBKDecode(":%E9%80%81%E8%BE%BE%E6%97%A5%E6%9C%9F%20%E9%80%81%E8%BE%BE%E6%97%B6%E9%97%B4"))

    'utf-8编码     '参数1：sinput 需要进行utf-8编码的字符串     '参数2：schar 可选参数，默认为“=”     public function utf8encode(byval sinput as string, optional byval schar as string = "=") as string     dim s_utf8bytes() as byte     dim s_ret as string = ""     s_utf8bytes = system.text.encoding.utf8.getbytes(sinput) '得到utf-8字节数组     for i as integer = 0 to s_utf8bytes.length - 1     if s_utf8bytes(i) <= 127 then     s_ret &= chr(s_utf8bytes(i))     else     '添加分隔符     if s_utf8bytes.length - i >= 3 then     s_ret &= schar & hex(s_utf8bytes(i) \ 16) & hex(s_utf8bytes(i) mod 16)     i += 1     s_ret &= schar & hex(s_utf8bytes(i) \ 16) & hex(s_utf8bytes(i) mod 16)     i += 1     s_ret &= schar & hex(s_utf8bytes(i) \ 16) & hex(s_utf8bytes(i) mod 16)     end if     end if     next     return s_ret     end function

    'utf-8解码函数     '参数1：sinput 需要解码的utf-8编码串     '参数2：schar 可选参数，默认为“=”     public function utf8decode(byval sinput as string, optional byval schar as string = "=") as string     dim s_bytes(0 to 2) as byte     dim s_ret as string = ""

    for i as integer = 0 to sinput.length - 1     if sinput.substring(i, 1) <> schar then     s_ret &= sinput.substring(i, 1)     else     if sinput.length - i >= 9 then     s_bytes(0) = cbyte("&h" & sinput.substring(i + 1, 2))     s_bytes(1) = cbyte("&h" & sinput.substring(i + 4, 2))     s_bytes(2) = cbyte("&h" & sinput.substring(i + 7, 2))     s_ret &= system.text.encoding.utf8.getstring(s_bytes)     i += 8     end if     end if     next     return s_ret     end function #end region

'例如： 1、调用utf8encode编码     sstr=utfencode("吉林")     msgbox sstr   '弹出信息 “=e5=90=89=e6=9e=97” 2、调用utfdecode解码     sstr=utfdecode("=e9=95=bf=e6=98=a5")     msgbox sstr   '弹出信息 “长春”