c#讀寫二進制

using System;
using System.IO;
using System.Text;

namespace Hello
{
    class Program
    {
        static void Main(string[] args)
        {
            string srcfilename = "e:/copy/test.jpg";
            string targetfilename = "e:/copy/test1.jpg";
            var arr = new byte[] { 0x0F, 0x87, 0xC3, 0xE1, 0xF0 };
            FileStream fs, outfile; //聲明FileStream對象
            try
            {
                //讀文件流
                fs = new FileStream(srcfilename, FileMode.OpenOrCreate,FileAccess.Read);
                //寫文件流
                outfile = new FileStream(targetfilename, FileMode.OpenOrCreate, FileAccess.Write);
                BinaryWriter bw = new BinaryWriter(outfile);

                var len = (int)fs.Length;
                var bits = new byte[len];
                fs.Read(bits, 0, len);
                //修改二進制內容
                Random r = new Random();
                for (int i = 0; i < len; i++) {
                    var rint = r.Next(0, 4);
                    bits[i] |= bits[rint];
                }
                //寫入文件
                bw.Write(bits);
                //關閉流
                bw.Close();
                outfile.Close(); //關閉BinaryWriter對象
                fs.Close(); //關閉文件流
                Console.WriteLine("成功寫入");
            }
            catch (IOException ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }
}