Find dir paths for a file-CodePudding

I have a file path (it is a virtual file system path) and I want to find files with a name "test.txt" from parent dir. to its root dir/

string test = "test.txt" Let say I have a path : root/dir1/dir2/dir3/dir4/file.cs

Now, if I do

string parentDirectoryName = Path.GetDirectoryName(file); //Here I get dir4
string filePath = Directory.GetFiles(parentDirectoryName, test ).FirstOrDefault(); //I get the path of the text.txt if it is present or i get null.

But now, I want to go until root (and see if there is any file named test.txt) and if yes, get the path of all those files.

O/P should be List<string> with all file paths from current dir. to root dir. for a file named "test.txt"

How to do that ?

CodePudding user response：

Try something like this out:

string test = "test.txt";
string somePath = @"C:\Users\mikes\Documents\Visual Studio 2017\Projects\CS_Scratch_WindowsFormsApp2\CS_Scratch_WindowsFormsApp2\Form1.cs";
FileInfo fi = new FileInfo(somePath);

List<string> testMatches = new List<string>();            
DirectoryInfo di = fi.Directory;
while (di != null)
{
    Console.WriteLine("Checking: "   di.FullName);
    string candidate = Path.Combine(di.FullName, test);
    if (File.Exists(candidate))
    {
        testMatches.Add(candidate);
    }
    di = di.Parent;
}

Console.WriteLine("Matches:");
foreach(string path in testMatches)
{
    Console.WriteLine(path);
}

Sample Output:

Checking: C:\Users\mikes\Documents\Visual Studio 2017\Projects\CS_Scratch_WindowsFormsApp2\CS_Scratch_WindowsFormsApp2
Checking: C:\Users\mikes\Documents\Visual Studio 2017\Projects\CS_Scratch_WindowsFormsApp2
Checking: C:\Users\mikes\Documents\Visual Studio 2017\Projects
Checking: C:\Users\mikes\Documents\Visual Studio 2017
Checking: C:\Users\mikes\Documents
Checking: C:\Users\mikes
Checking: C:\Users
Checking: C:\
Matches:
C:\Users\mikes\Documents\test.txt

CodePudding user response：

Directory.GetParent(string path) is the usual way to get a parent directory in .NET. You can use it to "walk up" the filesystem to the root, something like this:

string startPath = @"C:\dir1\dir2\dir3\dir4\file.cs";
string fileName = "test.txt";

DirectoryInfo? currentDirectory = Directory.GetParent(startPath);

while (currentDirectory != null)
{
    currentDirectory.FullName.Dump();
    
    string searchPath = Path.Combine(currentDirectory.FullName, fileName);
    
    if (File.Exists(searchPath)
    {
        // Do something here (like add searchPath to a List<string>)
    }
    
    currentDirectory = Directory.GetParent(currentDirectory.FullName);
}