C# 字符转ASCII码，ASCII码转字符

public static int Asc(string character)
   {
    if (character.Length == 1)
    {
     System.Text.ASCIIEncoding asciiEncoding = new System.Text.ASCIIEncoding();
     int intAsciiCode = (int)asciiEncoding.GetBytes(character)[0];
     return (intAsciiCode);
    }
    else
    {
      return -1 //长度小于1
    }
   }

public static string Chr(int asciiCode)
   {
    if (asciiCode >= 0 && asciiCode <= 255)
    {
     System.Text.ASCIIEncoding asciiEncoding = new System.Text.ASCIIEncoding();
     byte[] byteArray = new byte[] { (byte)asciiCode };
     string strCharacter = asciiEncoding.GetString(byteArray);
     return (strCharacter);
    }
    else
    {
     return “格式不正确”;
    }