void GetXamlBuildProviderExtension(XamlType rootXamlType) { if (rootXamlType.UnderlyingType == null) { return; } this.GetXamlBuildProviderExtensionFactory(rootXamlType); if (xamlBuildProviderExtensionFactory != null) { this.xamlBuildProviderExtension = xamlBuildProviderExtensionFactory.GetXamlBuildProviderExtension(); } }