FileStream -- 复制文件

 using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 //添加命名空间

 using System.IO;

 namespace 文件流

 {

     class Program

     {

         static void Main(string[] args)

         {

             string source = @"C:\Users\Administrator\Desktop\增加.gif";

             string target = @"C:\Users\Administrator\Desktop\new.gif";

             Command.CopyFile(source, target);

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

             Console.ReadKey();

         }

     }

     //操作类

     public class Command

     {

         public static void CopyFile(string source, string target)

         {

             //创建读取流

             using(FileStream fsRead = new FileStream(source, FileMode.Open, FileAccess.Read))

             {

                 //创建写入流

                 using(FileStream fsWrite = new FileStream(target, FileMode.OpenOrCreate, FileAccess.Write))

                 {

                     //字节数组，存放取出的字节数

                     byte[] buffer = new byte[ *  * ];

                     //循环，当i！=0的时候循环

                     while (true)

                     {

                         //当前是假存到字节数组中的字节数

                         int i = fsRead.Read(buffer, , buffer.Length);

                         //如果i==0，break；

                         if (i == )

                         {

                             break;

                         }

                         //写入数据

                         fsWrite.Write(buffer, , i);

                     }

                 }

             }

         }

     }

 }