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Wpf binding not updating when source changes
I don't usually write tutorial blog posts and series, preferring instead to develop new controls or novel techniques.
However, I really felt this subject needed an in-depth tutorial.
NET languages are typically termed 'CLR properties' (Where CLR refers to the Common Language Runtime) so that we know which type of property we are talking about!
CLR properties are simply shorthand for methods used to access a backing field.
We'll start with a simple model object, or business object, and see how we can take the properties that this object exposes and display them in the UI using standard controls.
We will also see how we can respond to event raised by these controls in order to update our model.
For our example we'll look at a very simple UI which displays the details of an event, its name and the date of the event: The model that supports this view is shown below: , allowing us to detect changes in its properties.
We will use this to update the view when the model changes.Note, that I am making the assumption that your code will contain some sort of model object. You could store your data within the UI controls directly, however this rapidly becomes un-maintainable.There are a whole host of UI patterns that have been developed in order to keep the model and the view separate (MVP, MVC, MVVM etc...) We'll look at how to manage the interactions between the model and the view without the help of a binding framework.In the example below, a dependency property 'Total Goals' is defined on a dependency object.By convention, this dependency property is exposed as a public static field on the dependency object.Note that the first argument is the dependency property that is defined on Text Box and is public static.binding is used, changes to the target property, which typically occur due to user interactions, are propagated from the target to the source.OK, so the title is a little ambitious, but there is nothing wrong with setting yourself lofty aims!Because of the depth of this topic I have decided to split this tutorial up into a series of blog posts, each of which explore a different aspect of the binding framework.It is this static field that we use to identify the dependency property when binding to it: However, this is purely convention.Whilst the target for a binding must be a dependency property (which must be defined on a dependency object), the source can be either a dependency property or a CLR property.