Xamarin.Forms.Xaml 1.0.0.0 1.1.0.0 1.2.0.0 1.4.0.0 1.5.0.0 2.0.0.0 System.Object Xamarin.Forms.Xaml.IMarkupExtension Extension class that differentiates between null values and empty strings. To be added. Constructor 1.0.0.0 1.1.0.0 1.2.0.0 1.4.0.0 1.5.0.0 2.0.0.0 Creates a new object with default values. To be added. Method 1.0.0.0 1.1.0.0 1.2.0.0 1.4.0.0 1.5.0.0 2.0.0.0 System.Object To be added. Returns the null object. To be added. To be added.