/// <summary>
/// Loads all *.csproj and *.vcxproj files found under a directory.
/// It searches all subdirectories.
/// </summary>
/// <param name="directoryPath">The path to search</param>
/// <returns>The number of files discovered</returns>
public int LoadAtDirectory(string directoryPath)
{
model.SetInputDirectory(directoryPath);
OnPropertyChanged("FoundProperties");
OnPropertyChanged("AllProjects");
OnPropertyChanged("AllConfigurations");
OnPropertyChanged("AllPlatforms");
return(model.Count);
}