还需要注意的是，在循环中获取目录名列表时，DirectoryInfo类只初始化一次，因此只允许第一次调用。为了绕过这个限制，请确保在循环中使用变量来存储任何单个目录的名称。

例如，这个示例代码循环遍历任何父目录中的目录列表，同时将每个找到的目录名称添加到字符串类型的list中:

[C#]

string[] parentDirectory = Directory.GetDirectories("/yourpath");
List<string> directories = new List<string>();

foreach (var directory in parentDirectory)
{
    // Notice I've created a DirectoryInfo variable.
    DirectoryInfo dirInfo = new DirectoryInfo(directory);

    // And likewise a name variable for storing the name.
    // If this is not added, only the first directory will
    // be captured in the loop; the rest won't.
    string name = dirInfo.Name;

    // Finally we add the directory name to our defined List.
    directories.Add(name);
}

(VB。净)

Dim parentDirectory() As String = Directory.GetDirectories("/yourpath")
Dim directories As New List(Of String)()

For Each directory In parentDirectory

    ' Notice I've created a DirectoryInfo variable.
    Dim dirInfo As New DirectoryInfo(directory)

    ' And likewise a name variable for storing the name.
    ' If this is not added, only the first directory will
    ' be captured in the loop; the rest won't.
    Dim name As String = dirInfo.Name

    ' Finally we add the directory name to our defined List.
    directories.Add(name)

Next directory

下面的代码只帮助获取文件夹名称

 public ObservableCollection items = new ObservableCollection();

   try
            {
                string[] folderPaths = Directory.GetDirectories(stemp);
                items.Clear();
                foreach (string s in folderPaths)
                {
                    items.Add(new gridItems { foldername = s.Remove(0, s.LastIndexOf('\\') + 1), folderpath = s });

                }

            }
            catch (Exception a)
            {

            }
  public class gridItems
    {
        public string foldername { get; set; }
        public string folderpath { get; set; }
    }

我可能会使用这样的东西:

string path = "C:/folder1/folder2/file.txt";
string lastFolderName = Path.GetFileName( Path.GetDirectoryName( path ) );

对GetDirectoryName的内部调用将返回完整的路径，而对GetFileName()的外部调用将返回最后一个路径组件——这将是文件夹名。

无论路径是否实际存在，这种方法都有效。然而，这种方法依赖于最初以文件名结尾的路径。如果不知道路径是否以文件名或文件夹名结束，那么它要求您首先检查实际路径，以查看该位置是否存在文件/文件夹。在这种情况下，丹·迪米特鲁的回答可能更合适。

string Folder = Directory.GetParent(path).Name;

var fullPath = @"C:\folder1\folder2\file.txt";
var lastDirectory = Path.GetDirectoryName(fullPath).Split('\\').LastOrDefault();

另一种方法是分割路径，使用c# 8.0中引入的Index Struct从路径中获取倒数第二个元素。

var path = @"C:\folder1\folder2\file.txt";
var folder = path.Split(@"\")[^2]; // 2nd element from the end

Console.WriteLine(folder); // folder2