Getting the basedir and filename from a path in C#-CodePudding

Is there any easy way to isolate the last 2 elements of the path (basedir filename) in C# or do I need to make some complex string regex? All examples I found online show either isolating the filename, or the full path minus filename.

Example of the input:

string1 = C:\dir\example\1\test.txt
string2 = C:\dir\example\2\anotherdir\example\file.ext
string3 = /mnt/media/hdd/test/1/2/3/4/dir/file

Expected output:

string1cut = 1\test.txt
string2cut = example\file.ext
string3cut = dir/file

CodePudding user response：

You can do this:

string path = @"C:\dir\example\1\test.txt";
string lastFolderName = Path.GetFileName(Path.GetDirectoryName(path));
string fileName =  Path.GetFileName(path);

string string1Cut = @$"{lastFolderName}\{fileName}";

outputs : 1\test.txt

CodePudding user response：

You can split the paths into individual parts and then get the last 2 elements.

Implementation:

class Program
{
    static void Main(string[] args)
    {
        var string1 = @"C:\dir\example\1\test.txt";
        var string2 = @"C:\dir\example\2\anotherdir\example\file.ext";
        var string3 = @"/mnt/media/hdd/test/1/2/3/4/dir/file";

        var string1cut = GetLast2Elements(string1);
        var string2cut = GetLast2Elements(string2);
        var string3cut = GetLast2Elements(string3);
        
        Console.WriteLine(string1cut);
        Console.WriteLine(string2cut);
        Console.WriteLine(string3cut);
    }

    static string GetLast2Elements(string path)
    {
        // determine the separator used in path
        var delimiter = path.Contains(@"\") ? @"\" : "/";
        // split path to parts using separator
        var parts = path.Split(delimiter);
        // get the last 2 elements
        return $@"{parts[^2]}{delimiter}{parts.Last()}";
    }
}

Output:

1\test.txt
example\file.ext
dir/file