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

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

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

这很难看，但避免了分配:

private static string GetFolderName(string path)
{
    var end = -1;
    for (var i = path.Length; --i >= 0;)
    {
        var ch = path[i];
        if (ch == System.IO.Path.DirectorySeparatorChar ||
            ch == System.IO.Path.AltDirectorySeparatorChar ||
            ch == System.IO.Path.VolumeSeparatorChar)
        {
            if (end > 0)
            {
                return path.Substring(i + 1, end - i - 1);
            }

            end = i;
        }
    }

    if (end > 0)
    {
        return path.Substring(0, end);
    }

    return path;
}

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

DirectoryInfo执行剥离目录名的工作

string my_path = @"C:\Windows\System32";
DirectoryInfo dir_info = new DirectoryInfo(my_path);
string directory = dir_info.Name;  // System32