文件复制两种方法C#

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using System.IO; namespace 文件复制 {     class Program     {         static void Main(string[] args)         {     //方法1             //File.Copy(@"F:\重温新中国建国珍贵画面(中央档案管).mp4", @"D:\123.mp4",true);             //Console.WriteLine("复制成功！");             //Console.ReadKey();     //方法2             byte[] dat = new byte[1024*1024*5];//5MByte             string Source = @"F:\学习资料\重温新中国建国珍贵画面(中央档案管).mp4";             string Target = @"D:\我的资料\视频1.mp4"; ;             using (FileStream FsRead = new FileStream(Source, FileMode.Open, FileAccess.Read))             {                 using (FileStream FsWriter = new FileStream(Target,FileMode.OpenOrCreate,FileAccess.Write))                 {                     int r = 0;                       while (true)                     {                         r=  FsRead.Read(dat,0,dat.Length);//把读到的数据长度保存起来                         if (r == 0) break;//如果读到的数据是0说明已经读完了就跳出方法                         FsWriter.Write(dat,0,r);//把数据写入到新文件中                     }                     Console.WriteLine(r);                     Console.WriteLine("复制成功！");                     Console.ReadKey();                 }            }         }     } }