Server.UrlEncode(string s)--对s进行Url编码:
Server.UrlDncode(string s)--对s进行Url解码:

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参考

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我觉得百度的这种编码方式是自己写的，LZ完全可以自己实现
我这里有个是最所以字符都进行编码的，LZ参考下
C# code

//编码
    public static string Encode(this string str)
    {
        string codeword = "";
        byte[] by = Encoding.Default.GetBytes(str);
        foreach (byte b in by)
        {
            codeword = codeword + "%" + b.ToString("X");
        }
        return codeword;
    }

//解码
    public static string Decode(this string str)
    {
        string[] strlist = str.Split(new string[] { "%" }, StringSplitOptions.RemoveEmptyEntries);
        byte[] by = new byte[strlist.Length];
        for (int i = 0; i < strlist.Length; i++)
        {
            string temp = strlist[i];
            int inttemp = ToInt(AnyToTen(temp, 16));
            if (inttemp > 0)
                by[i] = byte.Parse(inttemp.ToString());
            else
                return "";
        }
        return Encoding.Default.GetString(by);
    }

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额..不好意思，ToInt是转换成整数的方法，AnyToTen(temp, 16)是16进制转换成10进制的，LZ可以用其他方法代替


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C# code

private static long Test(string hexStr)
        {
            char[] charList = hexStr.ToCharArray();
            long result = 0;
            for (int i = 0; i < charList.Length; i++)
            {
                result += HexChar2Dec(charList[charList.Length - 1 - i]) * Power(16, i);
            }
            return result;
        }

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public static string Escape(string str)
{
 StringBuilder sb = new StringBuilder();
 foreach (char c in str)
 {
   sb.Append((Char.IsLetterOrDigit(c) || c == '-' || c == '_' || c == ' ' || c == '/' || c == '.') ? c.ToString() : Uri.HexEscape(c));
 }
 return sb.ToString();
}
protected void Page_Load(object sender, EventArgs e)
{
 Response.Write(Escape("ray()"));
}

或者直接引用Microsoft.JScript.dll

Microsoft.JScript.GlobalObject.escape("ray()")

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学习啦，谢谢大家