【C#】C#获取文件夹下的所有文件

#基础知识

　　1、获得当前运行程序的路径

 string rootPath = Directory.GetCurrentDirectory();

　　2、获得该文件夹下的文件，返回类型为FileInfo

 string path=@"X:\XXX\XX";
 DirectoryInfo root = new DirectoryInfo(path);
 FileInfo[] files=root.GetFiles();

　　3、获得该文件夹下的子目录，返回类型为DirectoryInfo

 string path=@"X:\XXX\XX";
 DirectoryInfo root = new DirectoryInfo(path);
 DirctoryInfo[] dics=root.GetDirectories();

　　4、获得文件夹名

 string path=@"X:\XXX\XX";
 DirectoryInfo root = new DirectoryInfo(path);
 string dicName=root.Name;

　　5、获得文件夹完整的路径名

 string path=@"X:\XXX\XX";
 DirectoryInfo root = new DirectoryInfo(path);
 string dicName=root.FullName;

　　6、获取文件的Name和FullName

 string path=@"X:\XXX\XX";
 DirectoryInfo root = new DirectoryInfo(path);
 foreach (FileInfo f in root.GetFiles())
 {
     string name=f.Name;
     string fullName=f.FullName;
 }    

#只获取目录下一级的文件夹与文件

 String path = @"X:\xxx\xxx";

 //第一种方法
 string[] files = Directory.GetFiles(path, "*.txt");

 foreach (string file in files)
 {
     Console.WriteLine(file);
 }

 //第二种方法
 DirectoryInfo folder = new DirectoryInfo(path);

 foreach (FileInfo file in folder.GetFiles("*.txt"))
 {
     Console.WriteLine(file.FullName);
 }

# 递归地输出当前运行程序所在的磁盘下的所有文件名和子目录名

         static void Main(string[] args)
         {
             //获取当前程序所在的文件路径
             String rootPath = Directory.GetCurrentDirectory();
             string parentPath = Directory.GetParent(rootPath).FullName;//上级目录
             string topPath = Directory.GetParent(parentPath).FullName;//上上级目录
             StreamWriter sw = null;
             try
             {
                 //创建输出流，将得到文件名子目录名保存到txt中
                 sw = new StreamWriter(new FileStream("fileList.txt", FileMode.Append));
                 sw.WriteLine("根目录：" + topPath);
                 getDirectory(sw, topPath, );
             }
             catch (IOException e)
             {
                 Console.WriteLine(e.Message);
             }
             finally
             {
                 if (sw != null)
                 {
                     sw.Close();
                     Console.WriteLine("完成");
                 }
             }

         }

         /// <summary>
         /// 获得指定路径下所有文件名
         /// </summary>
         /// <param name="sw">文件写入流</param>
         /// <param name="path">文件写入流</param>
         /// <param name="indent">输出时的缩进量</param>
         public static void getFileName(StreamWriter sw, string path, int indent)
         {
             DirectoryInfo root = new DirectoryInfo(path);
             foreach (FileInfo f in root.GetFiles())
             {
                 for (int i = ; i < indent; i++)
                 {
                     sw.Write("  ");
                 }
                 sw.WriteLine(f.Name);
             }
         }

         /// <summary>
         /// 获得指定路径下所有子目录名
         /// </summary>
         /// <param name="sw">文件写入流</param>
         /// <param name="path">文件夹路径</param>
         /// <param name="indent">输出时的缩进量</param>
         public static void getDirectory(StreamWriter sw, string path, int indent)
         {
             getFileName(sw, path, indent);
             DirectoryInfo root = new DirectoryInfo(path);
             foreach (DirectoryInfo d in root.GetDirectories())
             {
                 for (int i = ; i < indent; i++)
                 {
                     sw.Write("  ");
                 }
                 sw.WriteLine("文件夹：" + d.Name);
                 getDirectory(sw, d.FullName, indent + );
                 sw.WriteLine();
             }
         }

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