[C#]解决读写包含汉字的txt文件时乱码的问题

            fs.Close();

            return targetEncoding;

        }

        /// <summary>

        /// 取得一个文本文件流的编码方式。

        /// </summary>

        /// <param name="stream">文本文件流。</param>

        /// <param name="defaultEncoding">默认编码方式。当该方法无法从文件的头部取得有效的前导符时，将返回该编码方式。</param>

        /// <returns></returns>

        public static Encoding GetEncoding(FileStream stream, Encoding defaultEncoding)

        {

            Encoding targetEncoding = defaultEncoding;

            if(stream != null && stream.Length >= 2)

            {

                //保存文件流的前4个字节

                byte byte1 = 0;

                byte byte2 = 0;

                byte byte3 = 0;

                byte byte4 = 0;

                //保存当前Seek位置

                long origPos = stream.Seek(0, SeekOrigin.Begin);

                stream.Seek(0, SeekOrigin.Begin);

                int nByte = stream.ReadByte();

                byte1 = Convert.ToByte(nByte);

                byte2 = Convert.ToByte(stream.ReadByte());

                if(stream.Length >= 3)

                {

                    byte3 = Convert.ToByte(stream.ReadByte());

                }

                if(stream.Length >= 4)

                {

                    byte4 = Convert.ToByte(stream.ReadByte());

                }

                //根据文件流的前4个字节判断Encoding

                //Unicode {0xFF, 0xFE};

                //BE-Unicode {0xFE, 0xFF};

                //UTF8 = {0xEF, 0xBB, 0xBF};

                if(byte1 == 0xFE && byte2 == 0xFF)//UnicodeBe

                {

                    targetEncoding = Encoding.BigEndianUnicode;

                }

                if(byte1 == 0xFF && byte2 == 0xFE && byte3 != 0xFF)//Unicode

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