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[1024 * 1024 * 5];

                    //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, 0, buffer.Length);

                        //如果i==0，break；
                        if (i == 0)
                        {
                            break;
                        }

                        //写入数据
                        fsWrite.Write(buffer, 0, i);
                    }
                }
            }
        }
    }
}