003三大类库03_Stream

一.文件操作（所有文件类型）

<span style="white-space:pre">	</span>    //文件就是一堆字节块
            //windows下文本文件的基本编码方式
                //  ->ANSI
                //  ->unicode
                //  ->unicode big endim
                //  ->utf-8
            //命名空间 System.IO


            //FileStream 文件流 将文件以字节的方式进行读写
            
            //1.构造函数 new FileStream(文件路径,FileMode,FileAccess)
                 //FileMode:Create,Append,Open
            //2.写WriteByte(byte value)
            //using (FileStream fs = new FileStream("d:\\text.txt", FileMode.Create, FileAccess.Write))
            //{
            //    //string s = Console.ReadLine();
            //    string s = "我爱你";
            //    byte[] bs = Encoding.Default.GetBytes(s);
            //    foreach (var item in bs)
            //    {
            //        fs.WriteByte((byte)item);
            //    }
            //}
            //3.写void Write(byte[] array,int offset, int count) 从下标为offset的字节开始，写入count个字节
            using (FileStream fs = new FileStream("d:\\text.txt", FileMode.Create, FileAccess.Write))
            {
                byte[] bs = new byte[] { 65, 66, 67, 68, 69 };
                fs.Write(bs, 0, bs.Length );
            }
            //4.读int ReadByte()
            using (FileStream fs = new FileStream("d:\\text.txt", FileMode.Open, FileAccess.Read))
            {
                int reg = -1;
                while ((reg = fs.ReadByte()) != -1)
                {
                    Console.Write(reg + "/");
                }
                Console.WriteLine();
            }
            //5.写int Read(byte[] array,int offset, int count) 从下标为offset的字节开始，读入count个字节
            using (FileStream fs = new FileStream("d:\\text.txt", FileMode.Open, FileAccess.Read))
            {
                byte[] bs=new byte[1024*1024];//1M
                int count = fs.Read(bs,0,bs.Length);
                for (int i = 0; i < 0 + count; i++)
                {
                    Console.Write(bs[i] + "/");
                }
                Console.WriteLine();
            }

            #region 复制文件
            Console.Write("请输入要复制的文件#");
            string fileSource = Console.ReadLine();
            if (!File.Exists(fileSource))
            {
                Console.WriteLine("文件不存在，请按任意键结束");
                Console.ReadKey();
                return;
            }
            Console.Write("请输入保存的路径名#");
            string fileSave = Console.ReadLine();

            using (FileStream fileReader = new FileStream(fileSource, FileMode.Open, FileAccess.Read))
            {
                using (FileStream fileWriter = new FileStream(fileSave, FileMode.Create, FileAccess.Write))
                {
                    // 字节处理，作死
                    //int res = -1;
                    //while ((res = fileReader.ReadByte()) != -1)
                    //{
                    //    fileWriter.WriteByte((byte)res);
                    //}


                    // 字节数组
                    byte[] bs = new byte[1024 * 1024 * 10];
                    int count = 0;
                    while ((count = fileReader.Read(bs, 0, bs.Length)) > 0)
                    {
                        fileWriter.Write(bs, 0, count);
                    }

                }
            }
            #endregion

            Console.WriteLine("OK!");
            Console.ReadKey();

二.文本文件操作

<span style="white-space:pre">	</span>    //StreamReader and StreamWriter  专门针对文本文件的读写操作
            //写流 new StreamWriter("文本路径",bool isAppend,Encoding);
            // ->string Writer()
            // ->string WriterLine()
            using (StreamWriter sw = new StreamWriter("d:\\test.txt", false, Encoding.Default))
            {
                string str = "0123456789";
                sw.WriteLine(str);
                sw.WriteLine(str);
            }

            //读流 new StreamReader("文本路径",Encoding);
            // ->string[] ReadLine();
            // ->string ReadToEnd();
            using (StreamReader sr = new StreamReader("d:\\test.txt", Encoding.Default))
            {
                Console.Write(sr.ReadToEnd());
            }

            Console.ReadKey();

三.其他

-> File 静态
AppendAllText
AppendAllLines
ReadAllText
ReadAllLines
WriteAllText
WriteAllLines
bool Exist()
-> Directory 静态
string[] GetFiles(string) // 返回指定路径下的所有文件
string[] GetDirectories(string) // 返回改路径下的所有子文件夹
bool Exist()
-> Path 处理路径
获得后缀名
获得文件名
获得没有后缀名的文件名
获得全路径
-> FileInfo DirectoryInfo DriverInfo