C# txt 文件分割

<appSettings>
<!--是否开启大文件分隔策略-->
<add key="BigFile.Split" value="true"/>
<!--当文件大于这个配置项时就执行文件分隔，单位：GB -->
<add key="BigFile.SplitMinFileSizeGB" value="10" />
<!--当文件大于这个配置项时就执行文件分隔，单位：MB -->
<add key="BigFile.SplitMinFileSizeMB" value="10" />
<!--当执行文件分割时，每个分隔出来的文件大小，单位：MB -->
<add key="BigFile.SplitFileSize" value="100"/>
<add key="BigFile.FilePath" value="d:igfilesms6.api.yiche.com20191023.txt"/>
<add key="BigFile.FileSilitPathFormate" value="\172.x1.xx.xx文件拷贝liulongFTPxx2016-04-07x_20160407{0}.txt"/>
</appSettings>

    public class SplitFileStrategy2
    {
        public const byte Newline = 10;
        public const byte Return = 13;
        public void Split()
        {
            string file = ConfigurationManager.AppSettings.Get("BigFile.FilePath");

            int splitMinFileSizeMB = Convert.ToInt32(ConfigurationManager.AppSettings.Get("BigFile.SplitMinFileSizeMB")) * 1024 * 1204;
            int splitFileSize = Convert.ToInt32(ConfigurationManager.AppSettings.Get("BigFile.SplitFileSize")) * 1024 * 1024;
            FileInfo fileInfo = new FileInfo(file);

            if (fileInfo.Length > splitMinFileSizeMB)
            {
                Console.WriteLine("判定结果：需要分隔文件！");
            }
            else
            {
                Console.WriteLine("判定结果：不需要分隔文件！");
                Console.ReadKey();
                return;
            }
            int steps = (int)(fileInfo.Length / splitFileSize);
            var length = fileInfo.Length;
            using (FileStream fs = fileInfo.Open(FileMode.Open, FileAccess.Read))
            {
                using (BinaryReader br = new BinaryReader(fs))
                {
                    int couter = 1;
                    bool isReadingComplete = false;
                    while (!isReadingComplete)
                    {
                        string filePath = $"{fileInfo.FullName}.{couter}{fileInfo.Extension}";
                        Console.WriteLine("开始读取文件【{1}】：{0}", filePath, DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff"));
                        byte[] input = br.ReadBytes(splitFileSize);
                        var newLine = GetLineFeed(br);
                        using (FileStream writeFs = new FileStream(filePath, FileMode.Create))
                        {
                            using (BinaryWriter bw = new BinaryWriter(writeFs))
                            {
                                bw.Write(input);
                                bw.Write(newLine);
                            }
                        }
                        isReadingComplete = br.BaseStream.Position >= length;
                        if (!isReadingComplete)
                        {
                            couter += 1;
                        }
                        Console.WriteLine("完成读取文件【{1}】：{0}", filePath, DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff"));
                    }
                }
            }
            Console.WriteLine("分隔完成，请按下任意键结束操作。。。");
            Console.ReadKey();
        }

        /// <summary>
        /// 读取至换行

        /// </summary>
        /// <returns></returns>
        public byte[] GetLineFeed(BinaryReader br)
        {
            var list = new List<byte>();
            while (true)
            {
                try
                {
                    var currentByte = br.ReadByte();
                    list.Add(currentByte);
                    //小端存储
                    if (BitConverter.IsLittleEndian)
                    {
                        if (currentByte == Return)
                        {
                            currentByte = br.ReadByte();
                            list.Add(currentByte);
                            if (currentByte == Newline)
                            {
                                break;
                            }
                        }
                    }
                    else
                    {
                        if (currentByte == Newline)
                        {
                            currentByte = br.ReadByte();
                            list.Add(currentByte);
                            if (currentByte == Return)
                            {
                                break;
                            }
                        }
                    }
                }
                catch (EndOfStreamException ex)
                {
                    break;
                }

            }
            return list.ToArray();

        }
    }