C#字符串和Acsii码相互转换_C#教程

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
  {
    throw new Exception("Character is not valid.");
  }
 
}

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
   {
      throw new Exception("ASCII Code is not valid.");
   }
}

string str="abcd";
byte[] bytetest = System.Text.Encoding.Default.GetBytes(str.ToString());