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给定路径和某个部分，我如何才能找到该部分正下方的文件夹名称？

这很难解释，让我举几个例子。假设我正在寻找“Dev/Branches”下面的文件夹名称。以下是示例输入，预期结果以粗体显示

  • C:\Code\Dev\Branches\最新\bin\abc.dll
  • C:\开发\分支\ 5.1
  • D:\My Documents\Branches\ 7.0 \Source\Tests\test.cs

我正在使用 C#

编辑：我想我可以使用正则表达式/Dev/Branches/(.*?)/捕获第一组，但是没有正则表达式有没有更简洁的解决方案？无论如何，那个正则表达式在第二种情况下会失败。

4

5 回答 5

1

这是完全符合您期望的代码：

public static string GetSubdirectoryFromPath(string path, string parentDirectory, bool ignoreCase = true)
{
    // 1. Standarize the path separators.
    string safePath = path.Replace("/", @"\");
    string safeParentDirectory = parentDirectory.Replace("/", @"\").TrimEnd('\\');

    // 2. Prepare parentDirectory to use in Regex.
    string directory = Regex.Escape(safeParentDirectory);

    // 3. Find the immediate subdirectory to parentDirectory.
    Regex match = new Regex(@"(?:|.+)" + directory + @"\\([^\\]+)(?:|.+)", ignoreCase ? RegexOptions.IgnoreCase : RegexOptions.None);

    // 4. Return the match. If not found, it returns null.
    string subDirectory = match.Match(safePath).Groups[1].ToString();
    return subDirectory == "" ? null : subDirectory;
}

一个测试代码：

void Test()
{
    string path1 = @"C:\Code\Dev\Branches\Latest\bin\abc.dll";
    string path2 = @"C:\Dev\Branches\5.1";
    string path3 = @"D:\My Documents\Branches\7.0\Source\test.cs";

    Console.WriteLine("Matches:");
    Console.WriteLine(GetSubdirectoryFromPath(path1, "dev/branches/") ?? "Not found");
    Console.WriteLine(GetSubdirectoryFromPath(path1, @"Dev\Branches") ?? "Not found");
    Console.WriteLine(GetSubdirectoryFromPath(path3, "D:/My Documents/Branches") ?? "Not found");
    // Incorrect parent directory.
    Console.WriteLine(GetSubdirectoryFromPath(path2, "My Documents") ?? "Not found");
    // Case sensitive checks.
    Console.WriteLine(GetSubdirectoryFromPath(path3, @"My Documents\Branches", false) ?? "Not found");
    Console.WriteLine(GetSubdirectoryFromPath(path3, @"my Documents\Branches", false) ?? "Not found");

    // Output:
    //
    // Matches:
    // Latest
    // Latest
    // 7.0
    // Not found
    // 7.0
    // Not found
}
于 2013-02-28T13:28:11.817 回答
1 
// starting path
string path = @"C:\Code\Dev\Branches\Latest\bin\abc.dll";

// search path
string search = @"Dev\Branches";

// find the index of the search criteria
int idx = path.IndexOf(search);

// determine whether to exit or not
if (idx == -1 || idx + search.Length >= path.Length) return;

// get the substring AFTER the search criteria, split it and take the first item
string found = path.Substring(idx + search.Length).Split("\\".ToCharArray(), StringSplitOptions.RemoveEmptyEntries).First();

Console.WriteLine(found);
于 2013-02-28T13:19:36.570 回答
0

我和这个一起去了

public static string GetBranchName(string path, string prefix)
{
    string folder = Path.GetDirectoryName(path);

    // Walk up the path until it ends with Dev\Branches
    while (!String.IsNullOrEmpty(folder) && folder.Contains(prefix))
    {
        string parent = Path.GetDirectoryName(folder);
        if (parent != null && parent.EndsWith(prefix))
            return Path.GetFileName(folder);

        folder = parent;
    }

    return null;
}
于 2013-03-06T11:24:06.117 回答
0

Break it down into smaller steps and you can solve this yourself:

  1. (Optional, depending on further requirements): Get the directory name (file is irrelevant): Path.GetDirectoryName(string)
  2. Get its parent directory Directory.GetParent(string).

This comes down to;

 var directory = Path.GetDirectoryName(input);
 var parentDirectory = Directory.GetParent(directory);

The supplied C:\Dev\Branches\5.1 -> 5.1 does not conform to your specification, that is the directory name of the input path itself. This will output Branches.

于 2013-02-28T12:49:29.993 回答
0 
new Regex("\\?" + PathToMatchEscaped + "\\(\w+)\\?").Match()...
于 2013-02-28T12:50:17.780 回答