Bug in Directory.GetParent?

Question

I was hit in the face by a very weird behavior of the System.IO.Directory.GetParent method:

string path1 = @\"C:\\foo\\bar\";
DirectoryInfo pare         


        

Answer 1

I agree with GSerg. Just to add some additional firepower, I'm going to add the following code snippets obtained with Reflector.

The Directory.GetParent function basically just calls the Path.GetDirectoryName function:

[SecuritySafeCritical]
public static DirectoryInfo GetParent(string path)
{
    if (path == null)
    {
        throw new ArgumentNullException("path");
    }
    if (path.Length == 0)
    {
        throw new ArgumentException(Environment.GetResourceString("Argument_PathEmpty"), "path");
    }
    string directoryName = Path.GetDirectoryName(Path.GetFullPathInternal(path));
    if (directoryName == null)
    {
        return null;
    }
    return new DirectoryInfo(directoryName);
}

The Parent property of the DirectoryInfo basically strips off a trailing slash and then calls Path.GetDirectoryName:

public DirectoryInfo Parent
{
    [SecuritySafeCritical]
    get
    {
        string fullPath = base.FullPath;
        if ((fullPath.Length > 3) && fullPath.EndsWith(Path.DirectorySeparatorChar))
        {
            fullPath = base.FullPath.Substring(0, base.FullPath.Length - 1);
        }
        string directoryName = Path.GetDirectoryName(fullPath);
        if (directoryName == null)
        {
            return null;
        }
        DirectoryInfo info = new DirectoryInfo(directoryName, false);
        new FileIOPermission(FileIOPermissionAccess.PathDiscovery | FileIOPermissionAccess.Read, info.demandDir, false, false).Demand();
        return info;
    }
}