文件流操作（FileStream，StreamReader，StreamWriter）

大文件拷贝：

 1 /// <summary>

 2         /// 大文件拷贝

 3         /// </summary>

 4         /// <param name="sSource"></param>

 5         /// <param name="sTarget"></param>

 6         private static void CopyFile(string sSource, string sTarget)

 7         {

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

 9             {

10                 using (FileStream fsWrite=new FileStream(sTarget,FileMode.Create,FileAccess.Write))

11                 {

12                     double n = (double)fsRead.Length;

13                     Stopwatch sw = new Stopwatch();

14 

15                     sw.Start();

16                     while (true)

17                     {

18                         //定义一个6MB的缓冲区

19                         byte[] buffer = new byte[6 * 1024 * 1024];

20                         int m = fsRead.Read(buffer, 0, buffer.Length);

21 

22                         if (m==0)

23                         {

24                             break;

25                         }

26                         else

27                         {

28                             fsWrite.Write(buffer, 0, m);

29                             double dl = Math.Round(((double)fsWrite.Position / n) * 100, 1);

30                             Console.WriteLine("总进度：{0}%", dl);

31                         }

32                     }

33                     sw.Stop();

34                     double iTime = Math.Round((double)sw.ElapsedMilliseconds / 1000, 2);

35                     Console.WriteLine("总运行时间："+iTime+"秒");

36                 }

37             }

38         }

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FileStream是对字节(byte)的操作，上面这种方法拷贝电影文件，大的压缩文件等没问题，但是对于文本文件多半使用后面2个类StreamReader，StreamWriter，

 1 #region 使用StreamWriter进行写

 2             using (StreamWriter sw = new StreamWriter(@"D:\demo.txt"))

 3             {

 4                 for (int i = 1; i <= 20; i++)

 5                 {

 6                     sw.WriteLine(DateTime.Now.ToString("yyyy-MM-dd") + "\t" + i.ToString());

 7                 }

 8             }

 9             Console.WriteLine("OK"); 

10             #endregion

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 1 #region 使用StreamReader进行读

 2             using (StreamReader sr = new StreamReader(@"D:\demo.txt"))

 3             {

 4                 string s = sr.ReadLine();

 5                 while (!string.IsNullOrEmpty(s))

 6                 {

 7                     Console.WriteLine(s);

 8                     s = sr.ReadLine();

 9                 }

10             } 

11             #endregion

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