Indicates that the binding should only propagates changes from target (the BindableObject) to source (usually the View Model). This is mainly used for read-only BindableProperty values.
Syntax
Requirements
Namespace: Xamarin.Forms
Assembly: Xamarin.Forms.Core (in Xamarin.Forms.Core.dll)
Assembly Versions: 1.0.0.0, 1.1.0.0, 1.2.0.0, 1.3.0.0