c#FileStream

1. //使用文件流读取数据
            FileStream fsRead = new FileStream(@"C:UsersAdministratorDesktopc#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:UsersAdministratorDesktopc#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）video14、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 ew.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:UsersAdministratorDesktopc#笔记 hird 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:UsersAdministratorDesktopc#笔记 hird day.txt"))
            {
                string swt = "今天天气很晴朗，我真的很想找个女朋友";
                sw.Write(swt);

            }