C# 管理文件、文件夾的相關操做

1.  文件夾、文件的相關操做方法

   /// <summary>
    /// 文件夾  文件管理
    /// 
    /// 會有一些在開發環境/測試環境/生產環境 不一樣，
    /// 數據庫鏈接--路徑--開關
    /// 配置文件：不用改代碼編譯
    /// 
    /// 配置路徑：絕對路徑      
    ///           相對路徑 /  而後拼裝
    ///           至關於應用程序所在路徑
    ///           
    /// 配置文件最好有個集中管理的類
    /// 
    /// 
    /// </summary>
    public class MyIO
    {
        /// <summary>
        /// 配置絕對路徑
        /// </summary>
        private static string LogPath = ConfigurationManager.AppSettings["LogPath"];
        private static string LogMovePath = ConfigurationManager.AppSettings["LogMovePath"];
        /// <summary>
        /// 獲取當前程序路徑
        /// </summary>
        private static string LogPath2 = AppDomain.CurrentDomain.BaseDirectory;

        /// <summary>
        /// 讀取文件夾  文件信息
        /// </summary>
        public static void Show()
        {
            {//check
                if (!Directory.Exists(LogPath))//檢測文件夾是否存在
                {

                }
                DirectoryInfo directory = new DirectoryInfo(LogPath);//不存在不報錯  注意exists屬性
                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);//一次性建立所有的子路徑
                    Directory.Move(LogPath, LogMovePath);//移動  原文件夾就不在了
                    Directory.Delete(LogMovePath);//刪除
                }
            }
            {//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);//建立了文件夾以後，才能建立裏面的文件
                    using (FileStream fileStream = File.Create(fileName))//打開文件流 （建立文件並寫入）
                    {
                        string name = "12345567778890";
                        byte[] bytes = Encoding.Default.GetBytes(name);
                        fileStream.Write(bytes, 0, bytes.Length);
                        fileStream.Flush();
                    }
                    using (FileStream fileStream = File.Create(fileName))//打開文件流 （建立文件並寫入）
                    {
                        StreamWriter sw = new StreamWriter(fileStream);
                        sw.WriteLine("1234567890");
                        sw.Flush();
                    }

                    using (StreamWriter sw = File.AppendText(fileName))//流寫入器（建立/打開文件並寫入）
                    {
                        string msg = "今天是Course6IOSerialize，今天上課的人有55我的";
                        sw.WriteLine(msg);
                        sw.Flush();
                    }
                    using (StreamWriter sw = File.AppendText(fileName))//流寫入器（建立/打開文件並寫入）
                    {
                        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))//分批讀取
                    {
                        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);//儘可能不要delete
                }
            }

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

                foreach (DriveInfo drive in drives)
                {
                    if (drive.IsReady)
                        Console.WriteLine("類型：{0} 卷標：{1} 名稱：{2} 總空間：{3} 剩餘空間：{4}", drive.DriveType, drive.VolumeLabel, drive.Name, drive.TotalSize, drive.TotalFreeSpace);
                    else
                        Console.WriteLine("類型：{0}  is not ready", drive.DriveType);
                }

            }

            {
                Console.WriteLine(Path.GetDirectoryName(LogPath));  //返回目錄名，須要注意路徑末尾是否有反斜槓對結果是有影響的
                Console.WriteLine(Path.GetDirectoryName(@"d:\\abc")); //將返回 d:\
                Console.WriteLine(Path.GetDirectoryName(@"d:\\abc\"));// 將返回 d:\abc
                Console.WriteLine(Path.GetRandomFileName());//將返回隨機的文件名
                Console.WriteLine(Path.GetFileNameWithoutExtension("d:\\abc.txt"));// 將返回abc
                Console.WriteLine(Path.GetInvalidPathChars());// 將返回禁止在路徑中使用的字符
                Console.WriteLine(Path.GetInvalidFileNameChars());//將返回禁止在文件名中使用的字符
                Console.WriteLine(Path.Combine(LogPath, "log.txt"));//合併兩個路徑
            }
        }

2. 常見應用：找出一個文件夾中的全部子文件夾（找出全部文件方法與此相似）

        /// <summary>
        /// 找出所有的子文件夾
        /// </summary>
        /// <param name="rootPath">根目錄</param>
        /// <returns></returns>
        public static List<DirectoryInfo> GetAllDirectory(string rootPath)
        {
            if (!Directory.Exists(rootPath))
                return new List<DirectoryInfo>();

            List<DirectoryInfo> directoryList = new List<DirectoryInfo>();//容器
            DirectoryInfo directory = new DirectoryInfo(rootPath);//root文件夾
            directoryList.Add(directory);

            return GetChild(directoryList, directory);

          
        }

        /// <summary>
        /// 完成 文件夾--子目錄--放入集合
        /// </summary>
        /// <param name="directoryList"></param>
        /// <param name="directoryCurrent"></param>
        /// <returns></returns>
        private static List<DirectoryInfo> GetChild(List<DirectoryInfo> directoryList, DirectoryInfo directoryCurrent)
        {
            var childArray = directoryCurrent.GetDirectories();
            if (childArray != null && childArray.Length > 0)
            {
                directoryList.AddRange(childArray);
                foreach (var child in childArray)
                {
                    GetChild(directoryList, child);
                }
            }
            return directoryList;
        }