将汉字以utf8方式编码及解码

编码:
using System.Text;

        byte[] buffer = Encoding.GetEncoding("utf-8").GetBytes("中国");
        string str = "";

        foreach (byte b in buffer) str += string.Format("%{0:X}", b);


解码：
 public static string Decode(string str)
  
     {
         
  string[] strs = str.Split('%');
    
       List<byte> list = new List<byte>();
      
     for (int i = 0; i < strs.Length; i++)
       
    {
             
  if (strs[i] == "") continue;
    
     int a = Int32.Parse(strs[i].ToLower(), System.Globalization.NumberStyles.AllowHexSpecifier);
  //将十六进制转换成十进制  
           list.Add((byte)a);
       
    }
        
   return CharsToString(System.Text.Encoding.UTF8.GetChars(list.ToArray()));
   
    }