c#怎么才能将中文转换成utf-8编码

UTF8Encoding utf8 =new UTF8Encoding();String unicodeString= "大西瓜";Byte[] encodedBytes= utf8.GetBytes(unicodeString);String decodedString= utf8.GetString(encodedBytes);Response.Write(decodeString);

string s = BitConverter.ToString(System.Text.Encoding.UTF8.GetBytes("大西瓜"));

string s = "大西瓜";            string code = "";            foreach (byte b in Encoding.UTF8.GetBytes(s))            {                code += '%' + b.ToString("X");            }            Console.WriteLine(code);

public static string UrlEncode(string str){    if (str == null)    {        return null;    }    return UrlEncode(str, Encoding.UTF8);}