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Question

  //16进制转对应ASCII字符:
            byte babb = 0x45;
            string ass = ((char)babb).ToString();
   //ASCII字符串转16进制数
            string s2 = "2Ab刘";
            byte[] ba = System.Text.ASCIIEncoding.Default.GetBytes(s2);
            StringBuilder sb = new StringBuilder();
            foreach (byte b in ba)
            {
                sb.Append(b.ToString("x") + " ");
            }

Answer 1

string hexstr = "";
string S= ((char)int.Parse(hexstr, System.Globalization.NumberStyles.HexNumber)).ToString();  
System.Console.WriteLine(S);