学习笔记: IO操作及序列化

/// <summary>
/// 文件夹  文件管理
/// </summary>
public class MyIO
{
     /// <summary>
     /// 配置绝对路径
     /// </summary>
     private static string LogPath = ConfigurationManager.AppSettings["LogPath"];
     private static string LogMovePath = ConfigurationManager.AppSettings["LogMovePath"];
     /// <summary>
     /// 获取当前程序路径
     /// </summary>
     private static string LogPath2 = AppDomain.CurrentDomain.BaseDirectory;

    /// <summary>
     /// 读取文件夹  文件信息
     /// </summary>
     public static void Show()
     {
         {//check
             if (!Directory.Exists(LogPath))//检测文件夹是否存在
             {

            }
             DirectoryInfo directory = new DirectoryInfo(LogPath);//不存在不报错  注意exists属性
             Console.WriteLine(string.Format("{0} {1} {2}", directory.FullName, directory.CreationTime, directory.LastWriteTime));

            if (!File.Exists(Path.Combine(LogPath, "info.txt")))
             {
             }

            FileInfo fileInfo = new FileInfo(Path.Combine(LogPath, "info.txt"));

            Console.WriteLine(string.Format("{0} {1} {2}", fileInfo.FullName, fileInfo.CreationTime, fileInfo.LastWriteTime));
         }
         {//Directory
             if (!Directory.Exists(LogPath))
             {
                 DirectoryInfo directoryInfo = Directory.CreateDirectory(LogPath);//一次性创建全部的子路径
                 Directory.Move(LogPath, LogMovePath);//移动  原文件夹就不在了
                 Directory.Delete(LogMovePath);//删除
             }
         }
         {//File
             string fileName = Path.Combine(LogPath, "log.txt");
             string fileNameCopy = Path.Combine(LogPath, "logCopy.txt");
             string fileNameMove = Path.Combine(LogPath, "logMove.txt");
             bool isExists = File.Exists(fileName);
             if (!isExists)
             {
                 Directory.CreateDirectory(LogPath);//创建了文件夹之后，才能创建里面的文件
                 using (FileStream fileStream = File.Create(fileName))//打开文件流 （创建文件并写入）
                 {
                     string name = "12345567778890";
                     byte[] bytes = Encoding.Default.GetBytes(name);
                     fileStream.Write(bytes, 0, bytes.Length);
                     fileStream.Flush();
                 }
                 using (FileStream fileStream = File.Create(fileName))//打开文件流 （创建文件并写入）
                 {
                     StreamWriter sw = new StreamWriter(fileStream);
                     sw.WriteLine("1234567890");
                     sw.Flush();
                 }

                using (StreamWriter sw = File.AppendText(fileName))//流写入器（创建/打开文件并写入）
                 {
                     string msg = "今天是Course6IOSerialize，今天上课的人有55个人";
                     sw.WriteLine(msg);
                     sw.Flush();
                 }
                 using (StreamWriter sw = File.AppendText(fileName))//流写入器（创建/打开文件并写入）
                 {
                     string name = "0987654321";
                     byte[] bytes = Encoding.Default.GetBytes(name);
                     sw.BaseStream.Write(bytes, 0, bytes.Length);
                     sw.Flush();
                 }

                foreach (string result in File.ReadAllLines(fileName))
                 {
                     Console.WriteLine(result);
                 }
                 string sResult = File.ReadAllText(fileName);
                 Byte[] byteContent = File.ReadAllBytes(fileName);
                 string sResultByte = System.Text.Encoding.UTF8.GetString(byteContent);

                using (FileStream stream = File.OpenRead(fileName))//分批读取
                 {
                     int length = 5;
                     int result = 0;

                    do
                     {
                         byte[] bytes = new byte[length];
                         result = stream.Read(bytes, 0, 5);
                         for (int i = 0; i < result; i++)
                         {
                             Console.WriteLine(bytes[i].ToString());
                         }
                     }
                     while (length == result);
                 }

                File.Copy(fileName, fileNameCopy);
                 File.Move(fileName, fileNameMove);
                 File.Delete(fileNameCopy);
                 File.Delete(fileNameMove);//尽量不要delete
             }
         }

        {//DriveInfo
             DriveInfo[] drives = DriveInfo.GetDrives();

            foreach (DriveInfo drive in drives)
             {
                 if (drive.IsReady)
                     Console.WriteLine("类型：{0} 卷标：{1} 名称：{2} 总空间：{3} 剩余空间：{4}", drive.DriveType, drive.VolumeLabel, drive.Name, drive.TotalSize, drive.TotalFreeSpace);
                 else
                     Console.WriteLine("类型：{0}  is not ready", drive.DriveType);
             }

        }

        {
             Console.WriteLine(Path.GetDirectoryName(LogPath));  //返回目录名，需要注意路径末尾是否有反斜杠对结果是有影响的
             Console.WriteLine(Path.GetDirectoryName(@"d:\\abc")); //将返回 d:\
             Console.WriteLine(Path.GetDirectoryName(@"d:\\abc\"));// 将返回 d:\abc
             Console.WriteLine(Path.GetRandomFileName());//将返回随机的文件名
             Console.WriteLine(Path.GetFileNameWithoutExtension("d:\\abc.txt"));// 将返回abc
             Console.WriteLine(Path.GetInvalidPathChars());// 将返回禁止在路径中使用的字符
             Console.WriteLine(Path.GetInvalidFileNameChars());//将返回禁止在文件名中使用的字符
             Console.WriteLine(Path.Combine(LogPath, "log.txt"));//合并两个路径
         }
     }

    /// <summary>
     /// 关于异常处理：(链接：http://pan.baidu.com/s/1kVNorpd 密码：pyhv)
     /// 1  try catch旨在上端使用，保证对用户的展示
     /// 2  下端不要吞掉异常，隐藏错误是没有意义的,抓住再throw也没意义
     /// 3  除非这个异常对流程没有影响或者你要单独处理这个异常
     /// </summary>
     /// <param name="msg"></param>
     public static void Log(string msg)
     {
         StreamWriter sw = null;
         try
         {
             string fileName = "log.txt";
             string totalPath = Path.Combine(LogPath, fileName);

            if (!Directory.Exists(LogPath))
             {
                 Directory.CreateDirectory(LogPath);
             }
             sw = File.AppendText(totalPath);
             sw.WriteLine(string.Format("{0}:{1}", DateTime.Now, msg));
             sw.WriteLine("***************************************************");
         }
         catch (Exception ex)
         {
             Console.WriteLine(ex.Message);//log
             //throw ex;
             //throw new exception("这里异常");
         }
         finally
         {
             if (sw != null)
             {
                 sw.Flush();
                 sw.Close();
                 sw.Dispose();
             }
         }
     }

}