C# 分段读/写文件(可实现断点续传)

            string filePath = @"C:\Users\wangbinbin\Desktop\TestDemo\TestDemo\files\";
            string savePath = (@"C:\Users\wangbinbin\Desktop\TestDemo\TestDemo\files\jayzai_{0}.rar", ("yyyyMMddHHmmssffff"));
            using (FileStream fsRead = new FileStream(filePath, , ))
            {
                //文件总长度
                long left = ;
                //存储读取结果  
                byte[] bytes = new byte[1024];
                //每次读取长度  
                int maxLength = ;
                using (FileStream fsWrite = new FileStream(savePath, , ))
                {
                    int start = 0;
                    int num = 0;
                    while (left > 0)
                    {
                         = start;
                        num = 0;
                        if (left < maxLength)
                            num = (bytes, 0, Convert.ToInt32(left));
                        else
                            num = (bytes, 0, maxLength);

                        if (num == 0)
                            break;

                        //保存文件
                        (bytes, 0, );

                        start += num;
                        left -= num;
                    }
                }
            }

            List<FileStreamModel> list = new List<FileStreamModel>();
            using (FileStream fsRead = new FileStream(filePath, , ))
            {
                //文件总长度
                long left = ;
                //存储读取结果  
                byte[] bytes = new byte[1024];
                //每次读取长度  
                int maxLength = ;

                int start = 0;
                int num = 0;
                while (left > 0)
                {
                     = start;
                    num = 0;
                    if (left < maxLength)
                        num = (bytes, 0, Convert.ToInt32(left));
                    else
                        num = (bytes, 0, maxLength);

                    if (num == 0)
                        break;

                    (new FileStreamModel { offset = start, file = Convert.ToBase64String(bytes) });

                    start += num;
                    left -= num;
                }
            }
            if (list != null &&  > 0)
            {
                using (FileStream fsWrite = new FileStream(savePath, , ))
                {
                    foreach (var obj in list)
                    {
                        byte[] bytes = Convert.FromBase64String();
                        (bytes, 0, );
                    }
                }
            }

            if (list != null &&  > 0)
            {
                using (FileStream fsWrite = new FileStream(savePath, , , ))
                {
                    //OrderBy随机：打乱了分段顺序；自己测试玩的，可以去掉OrderBy
                    foreach (var obj in (o => ()))
                    {
                        byte[] bytes = Convert.FromBase64String();
                        (, );
                        (bytes, 0, );
                    }
                }
            }

            if (list != null &&  > 0)
            {
                using (FileStream fsWrite = new FileStream(savePath, , , ))
                {
                    //OrderBy随机：打乱了分段顺序；自己测试玩的，可以去掉OrderBy
                    var binaryWriter = new BinaryWriter(fsWrite);
                    foreach (var obj in (o => ()))
                    {
                        (, );
                        byte[] bytes = Convert.FromBase64String();
                        (bytes);//写入数据
                    }
                    ();
                }
            }


    public class FileStreamModel
    {
        public int offset { get; set; }

        public string file { get; set; }
    }