ANSI文本格式读写

StreamReader sr = new StreamReader("yourFilePath", Encoding.Default);

string strBody = sr.ReadToEnd();

sr.Close();

写文件

StreamWriter sw = new StreamWriter("yourFilePath", false, Encoding.Default);

sw.Write("中文ABC");

sw.Close();

//字符Unicode

string s = "abCDlks";

//字符转Default(//8位无编码整数)

byte[] buffer = Encoding.Default.GetBytes(s);

//Default转Utf-8

string sU8 = Encoding.UTF8.GetString(buffer);

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.");

    }

}

ASCII码转字符：

public static string Chr(int asciiCode)

{

    if (asciiCode >= 0 && asciiCode <= 255)

    {

      ASCIIEncoding asciiEncoding = new ASCIIEncoding();

      byte[] byteArray = new byte[] { (byte)asciiCode };

      string strCharacter = asciiEncoding.GetString(byteArray);

      return (strCharacter);

   }

    else

    {

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

    }

}