一个判断文本文件编码的类.txt

 public class EncodingType    {        public static System.Text.Encoding GetType(string FILE_NAME)        {            FileStream fs = new FileStream(FILE_NAME, FileMode.Open, FileAccess.Read);            System.Text.Encoding r= GetType(fs);            fs.Close();            return r;        }        public static System.Text.Encoding GetType(FileStream fs)        {            /*byte[] Unicode=new byte[]{0xFF,0xFE};            byte[] UnicodeBIG=new byte[]{0xFE,0xFF};            byte[] UTF8=new byte[]{0xEF,0xBB,0xBF};*/

            BinaryReader r = new BinaryReader(fs,System.Text.Encoding.Default);            byte[] ss=r.ReadBytes(3);            r.Close();            //编码类型 Coding=编码类型.ASCII;            if(ss[0]>=0xEF)            {                if(ss[0]==0xEF && ss[1]==0xBB && ss[2]==0xBF)                {                    return System.Text.Encoding.UTF8;                }                else if(ss[0]==0xFE && ss[1]==0xFF)                {                    return System.Text.Encoding.BigEndianUnicode;                }                else if(ss[0]==0xFF && ss[1]==0xFE)                {                    return System.Text.Encoding.Unicode;                }                else                {                    return System.Text.Encoding.Default;                }            }            else            {                return System.Text.Encoding.Default;            }        }    }