1. //使用文件流读取数据

            FileStream fsRead = new FileStream(@"C:\Users\Administrator\Desktop\c#笔记\泛型集合.txt" , FileMode.OpenOrCreate,FileAccess.Read );

            //定义字节数组

            Byte [] byt = new Byte[1024*1024];

            //将读取的数据放入字节数组中,并返回实际数据的大小

           int realData = fsRead.Read(byt , 0 , byt.Length);

            //将字节数组中，实际长度内容转换成字符串

           string stt = Encoding.Default.GetString(byt , 0 ,realData);

            //关闭文件流

           fsRead.Close();

            //释放流所占用的资源

           fsRead.Dispose();

           Console.WriteLine(stt);

 

 

            //使用FileStream 来写数据

            //使用using将不用自己写close  &&dispose 来关闭数据流，释放资源空间。

            using(FileStream wtrite = new FileStream(@"C:\Users\Administrator\Desktop\c#笔记\泛型集合.txt",FileMode.Append , FileAccess.Write))

           {

               string fswrite = "看我有没有把你改掉";

               Byte[] newfs = Encoding.Default.GetBytes(fswrite);

               wtrite.Write(newfs , 0 ,newfs.Length);

           }

2.对多媒体文件复制到另一个路径

 static void Main(string[] args)

        {

            string sorceFile = @"F:\学习资料\c#\c#\亲情奉献-全套精品.Net基础班视频教程-video\亲情奉献全套精品.Net基础视频教程之10-面向对象多态\（第十二天）\video\14、最后小结.avi";

            string targetFile = @" F:\学习资料\c#\c#\亲情奉献-全套精品.Net基础班视频教程-video\亲情奉献全套精品.Net基础视频教程之10-面向对象多态\（第十二天）\video\new.avi";

            FileCopy(sorceFile, targetFile);

            Console.ReadKey();

        }

        /// <summary>

        /// 将一个多媒体文件复制到另一个文件路径下。

        /// </summary>

        /// <param name="scour">源文件</param>

        /// <param name="target">目标文件</param>

        static void FileCopy(string scour, string target)

        {

            using (FileStream fsread = new FileStream(scour , FileMode.Open , FileAccess.Read))

            {

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

                {

                    Byte []source = new Byte [1024*1024];

                    while(true)

                    {

                        int ds = fsread.Read(source, 0, source.Length);

                        if(ds == 0)

                        {

                            break;

                        }

                        //向目标文件中写数据

                        fsWrite.Write(source, 0, ds);

                    }

                }

 

3.StreamReader  StreamWriter

using (StreamReader sr = new StreamReader(@"C:\Users\Administrator\Desktop\c#笔记\third day.txt" , Encoding.Default ))

            {

                //当没有读到文档结束符

               while(!sr.EndOfStream)

               {

                   Console.WriteLine(sr.ReadLine());

               }

            }

            //使用StreamWrite向文本文档写数据

            using (StreamWriter sw = new StreamWriter(@"C:\Users\Administrator\Desktop\c#笔记\third day.txt"))

            {

                string swt = "今天天气很晴朗，我真的很想找个女朋友";

                sw.Write(swt);

            }