//復制源路徑string source = @"D:/音樂迷/音樂迷/mv/消愁-毛不易.mp4";//復制目的路徑string target = @"C:/Users/Administrator/Desktop/霸道的程序猿.mp4";CopyFile(source,target);Console.WriteLine("復制成功");Console.ReadKey();

public static void CopyFile(string source,string target)    {      //創建一個負責讀取的流      using (FileStream fsRead = new FileStream(source, FileMode.OpenOrCreate, FileAccess.Read))      {        //創建一個負責寫入的流        using (FileStream fdWrite = new FileStream(target,FileMode.OpenOrCreate,FileAccess.Write))        {          // 5 兆的字節數組          byte[] buffer = new byte[1024*1024*5];          //因為文件可能會比較大，所以我們在讀取的時候 應該通過一個循環去讀取          while (true)          {            //返回本次讀取實際讀取到的字節數            int r = fsRead.Read(buffer, 0, buffer.Length);            //如果返回一個0 也就意味著什么都沒有讀取到 即讀取完了            if (r == 0)            {              break;            }            fdWrite.Write(buffer,0,r);          }                  }      }    }

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.IO;namespace 多媒體文件復制{  class Program  {    static void Main(string[] args)    {      //先讀取出來，再寫入到指定路徑      string source = @"C:/123/123.avi";      string target = @"C:/123/456.avi";      CopyFile(source, target);    }    public static void CopyFile(string source, string target)    {      //創建一個讀取的流      using (FileStream fsRead = new FileStream(source, FileMode.OpenOrCreate, FileAccess.Read))      {        //創建一個寫入的流        using (FileStream fsWrite = new FileStream(target, FileMode.OpenOrCreate, FileAccess.Write))        {          //每次讀取5M大小          byte[] buffer = new byte[1024 * 1024 * 5];          //文件可能比較大，循環去讀          while (true)          {            //本次實際讀取到的字節數            int r = fsRead.Read(buffer, 0, buffer.Length);            //如果讀取到的字節數為0，則意味著讀完了            if (r == 0)            {              break;            }            fsWrite.Write(buffer, 0, r);          }        }      }    }  }}