Wpf textbox text binding not updating
Databinding is a fundamental part of the WPF, Silverlight and the Silverlight for Windows Phone 7 frameworks.
It is a powerful concept that once mastered allows you to write concise and elegant code.
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.
Modifying the code for our example to use the WPF / Silverlight framework results in the following code: This is a big improvement on the previous 'manual' example where three separate event handlers were required to maintain synchronization between the model and the view.
Databinding allows us to declare how the model is connected to the view, with the databinding framework taking care of the mechanics.
The view has the following XAML (with the various layout properties omitted for clarity): If we consider the model object to be the source of the data and the UI control to be the target.
We can see that we have three separate flows of data: The code for each of these three steps is distributed throughout our code, in the constructor and a variety of event handler.
binding is used, changes to the target property, which typically occur due to user interactions, are propagated from the target to the source.For each model property that we wish to expose to our user via the view, we have to add code to perform each of these three tasks.This leads to code that is hard to maintain and dataflow that are hard to trace.Yet for all its power, it is a little complex and that is my reason for launching into this blog series.The rough outline for this series is as follows: To understand what databinding is and the service it provides us with, it is worth looking at how you wire-up a user-interface without using databinding.