See if file path is inside a directory

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后悔当初
后悔当初 2021-01-23 20:51

How can I check whether a path to a file that doesn\'t necessarily exists points to a location inside a particular directory? Say I have a method:

bool IsInside(         


        
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  • 2021-01-23 21:09

    Do you need to handle relative paths (../../someFile.txt)? Something like this would work:

    private bool IsInside(DirectoryInfo path, DirectoryInfo folder)
    {
        if (path.Parent == null)
        {
            return false;
        }
    
        if (String.Equals(path.Parent.FullName, folder.FullName, StringComparison.InvariantCultureIgnoreCase))
        {
            return true;
        }
    
        return IsInside(path.Parent, folder);
    }
    

    Then call it like this:

    DirectoryInfo folder = new DirectoryInfo("C:\\Users\\Dude\\Hi");
    DirectoryInfo path = new DirectoryInfo("C:\\Users\\Dude\\Hi\\SubFolder\\SubSubFolder\\tile.txt");
    
    bool result = IsInside(path, folder);
    
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  • 2021-01-23 21:15

    You could try the string.IndexOf method. If you use the overload with the StringComparison enumeration it should give you the result you need.

    From above link:

    Reports the zero-based index of the first occurrence of one or more characters, or the first occurrence of a string, within this string. The method returns -1 if the character or string is not found in this instance.

    bool IsInside(string folder, string path)
    {
       if (path.IndexOf(folder,StringComparison.OrdinalIgnoreCase) != -1)
            return true;
        else
            return false;    
    
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