为了获取文件，C#提供了一个方法Directory.GetFiles

Directory.GetFiles返回所有文件的名称（包括它们的路径） ) 匹配指定的搜索模式，并可选择搜索子目录。

在下面的示例中，* 匹配该位置中的零个或多个字符。

SearchOption TopDirectoryOnly。仅搜索顶级目录

SearchOption AllDirectories .搜索所有顶级目录和子目录

FileInfo 获取文件长度、名称等信息

示例1 H2>

static void Main (string[] args) {
   string rootPath = @"C:UsersKoushikDesktopTestFolder";
   var files = Directory.GetFiles(rootPath, "*.*", SearchOption.AllDirectories);

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

输出

C:UsersKoushikDesktopTestFolderTestFolderMainTestFolderMain.txt
C:UsersKoushikDesktopTestFolderTestFolderMain 1TestFolderMain1.txt
C:UsersKoushikDesktopTestFolderTestFolderMain 2TestFolderMain2.txt
C:UsersKoushikDesktopTestFolderTestFolderMain 2TestFolderMainSubDirectoryTestFolderSubDirectory.txt

示例 2

static void Main (string[] args) {
   string rootPath = @"C:UsersKoushikDesktopTestFolder";
   var files = Directory.GetFiles(rootPath, "*.*", SearchOption.TopDirectoryOnly);

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

输出

C:UsersKoushikDesktopTestFolderTopdirectory.txt

示例 3

static void Main (string[] args) {
   string rootPath = @"C:UsersKoushikDesktopTestFolder";
   var files = Directory.GetFiles(rootPath, "*.*", SearchOption.AllDirectories);

   foreach (string file in files) {
      var info = new FileInfo(file);
      Console.WriteLine($"{ Path.GetFileName(file) }: { info.Length } bytes");
   }
   Console.ReadLine ();
}

输出

Topdirectory.txt: 0 bytes
TestFolderMain.txt: 0 bytes
TestFolderMain1.txt: 10 bytes
TestFolderMain2.txt: 20 bytes