Get folder depth from a virtual path

Question

I'm trying to get the folder position from a given path The path it self is not accessible therefore i cannot use the Directory nor DirectoryInfo class Reference post

the result should be something like:

1. C:\\ returns -1
2. c:\\FolderA returns 0
3. c:\\FolderA\\FolderB returns 1

I'm using the following but the result between 1 and 2 is the same :-(:

  public static int GetFolderLevelDepth(string fullPath)
        {
            if(string.IsNullOrEmpty(fullPath))
            {
                return -99;
            }
            int result = fullPath.Count(x => x == '\\');
            return result -2;
        }

Test:

[Test]
    public void Get_Level_Root_Depth_Test()
    {
        var result = StringModifier.GetFolderLevelDepth("c:\\");
        Assert.AreEqual(-1,result);
    }
    [Test]
    public void Get_Level_One_Depth_Test()
    {
        var result = StringModifier.GetFolderLevelDepth("c:\\Folder1");
        Assert.AreEqual(0, result);
    }
    [Test]
    public void Get_Level_Two_Depth_Test()
    {
        var result = StringModifier.GetFolderLevelDepth("c:\\Folder1\\Folder2");
        Assert.AreEqual(1, result);
    }

Answer 1

This code should account for the most likely input conditions:

int res = -99;
string input = fullPath.Trim();
if (input.Length > 0 && input.Contains(@"\"))
{
    if (input.Substring(input.Length - 1, 1) == @"\") input = input.Substring(0, input.Length - 1);
    res = input.Split('\\').Length - 2;
}
return res;

Answer 2

fullPath = fullPath.Trim();
if (fullPath[fullPath.Length - 1] != '\\')
    return fullPath.Count(x => x == '\\') - 1;
return fullPath.Count(x => x == '\\') - 2;

Or :

return fullPath.Split('\\').Length - 2

Answer 3

You could do something like this instead:

result = fullPath.Split('\\', StringSplitOptions.RemoveEmptyEntries).Length;

StringSplitOptions.RemoveEmptyEntries causes it to discard the last entry if the path ends with a backslash; which causes the code to not count the "empty directory name" at the end.

Note that this code won't take into account the current directory ( . ) and parent directory ( .. ) special directories, though.