c#读取文件，重新建立文件，把读取的数据放入到文件中去

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace OperateFile
{
    //获取图片的数据，然后将数据存储到另一张图片中去。
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                FileInfo fileInfo = new FileInfo("zhl.jpg");
                int fileSize = (int)(fileInfo.Length);
                FileStream afile = new FileStream("zhl.jpg", FileMode.Open);
                FileStream writefile = new FileStream("new.jpg", FileMode.CreateNew);
                //首先获取文件大小
                byte[] dataByte = new byte[1024];
                int i = (int)fileSize / 1024;
                int yu = (int)fileSize % 1024;

                //<1024byte的时候
                //==1024 byte的时候
                //>1024 byte的 时候，余数为0和不为0
                if (fileSize < 1024)
                {
                    //在此处写入到2.jpg文件中
                    afile.Seek(0, SeekOrigin.Begin);
                    afile.Read(dataByte, 0, fileSize);
                    writefile.Write(dataByte, 0, fileSize);
                    writefile.Close();
                    afile.Close();
                }
                else if (fileSize == 1024)
                {
                    afile.Seek(0, SeekOrigin.Begin);
                    afile.Read(dataByte, 0, fileSize);
                    writefile.Write(dataByte, 0, fileSize);
                    writefile.Close();
                    afile.Close();
                }
                else
                {
                    if (yu != 0)
                    {
                        for (int j = 0; j <i; j++)
                        {
                            afile.Seek(j * 1024, SeekOrigin.Begin);
                            afile.Read(dataByte, 0, 1024);
                            writefile.Write(dataByte, 0, 1024);
                        }
                        int seekNum = i * 1024;
                        long operNum = (long)seekNum;
                        afile.Seek(operNum, SeekOrigin.Begin);
                        afile.Read(dataByte, 0, yu);
                        writefile.Write(dataByte, 0, yu);
                        writefile.Close();
                        afile.Close();
                    }
                    else
                    {
                        for (int j = 0; j < i; j++)
                        {
                            afile.Seek(j * 1024, SeekOrigin.Begin);
                            afile.Read(dataByte, 0, 1024);
                            writefile.Write(dataByte, 0, 1024);
                        }
                        writefile.Close();
                        afile.Close();
                    }
                }
            }
            catch (System.Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }
}