C# 获取从 X 开始按名称排序的目录

Question

我需要获取另一个目录中的目录，但只有那些在 X 之后按目录名称排序的目录。

例子：

-Root

  |--DirectoryA

  |--DirectoryB

  |--DirectoryC

  |--DirectoryD

所以基本上是这样的：

foreach(string path in Directory.GetDirectories("/root/"))

{

    Console.WriteLine(path);

}

输出：

/root/DirectoryA

/root/DirectoryB

/root/DirectoryC

/root/DirectoryD

但我实际上只需要得到 C 之后的那些（包括它），我想用 Linq 应该不会太难，但我真的不知道怎么做。

也许是这样的：

Directory.GetDirectories("/root/").OrderByDescending(dirName => 

Path.GetDirectoryName(dirName)) ??

Answer 1

您可以使用SkipWhile，假设顺序是按字母顺序排列的：foreach(string path in Directory.GetDirectories("/root/")&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .Select(dir => Path.GetFileName(dir))&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .SkipWhile(dir => string.Compare(dir, "DirectoryC") < 0){&nbsp; &nbsp; Console.WriteLine(path);}这样您就可以避免在遇到第一个有效目录后进行冗余过滤。如果您只想获取文件夹，然后DirectoryC才能使用TakeWhile：foreach(string path in Directory.GetDirectories("/root/")&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .Select(dir => Path.GetFileName(dir))&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .TakeWhile(dir => string.Compare(dir, "DirectoryC") < 0){&nbsp; &nbsp; Console.WriteLine(path);}请注意，这string.Compare取决于文化，您可以使用其他重载来自定义其行为。

Answer 2

使用Where扩展方法foreach(string path in Directory&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;.GetDirectories("/root/")&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;.Where(d => String.Compare(Path.GetFileName(d), "DirectoryC") > 0)){&nbsp; &nbsp; Console.WriteLine(path);}如果需要，您还可以包含一个排序，但它不会影响使用Where. 如果你这样做了，Where为了效率，把它附加在后面。

Answer 3

或者以防万一您使用的是旧版本的 .NET，您总是可以自己编写逻辑：var directories = Directory.GetDirectories("C:\\").OrderByDescending(r => r).ToArray();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (directories != null && directories.Length > 0)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; for (int i = 0, Cindex=-1; i < directories.Length; i++)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (Cindex > 0)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Console.WriteLine(directories[i]);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; continue;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (directories[i] == "DirectoryC")&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Cindex = i;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }