FileStream类

【实例类】
【System.IO】
1.复制文件1.avi并命名为new.avi

 class Program
    {
         static void Main(string[] args)
        {
            string source = @"C:\1.avi";
            string target = @"C:\new.avi";
             using(FileStream fsRead=new FileStream(source,FileMode.OpenOrCreate,FileAccess.Read))
             {
                 using(FileStream fsWrite=new FileStream(target,FileMode.OpenOrCreate,FileAccess.Write))
                 {
                     byte[] buffer=new byte[1024*1024*5];
                     while (true)
                     {
                         int r = fsRead.Read(buffer, 0, buffer.Length);
                         fsWrite.Write(buffer, 0, r);
                         if (r==0)
                         {
                             break;
                         }

                     } 
                 }     
             }
             Console.WriteLine("复制成功");  
        }

    }