skip to content »

Wpf dependency property not updating

This means when anyone else writes a value directly to the User Control1. This happen when you type into either the "Direct Binding" textbox or into the "Result" textbox (within the user control); both of these are bound to the User Control1.Result property and hence both will write a value that replaces the binding.

wpf dependency property not updating-21

As it happens, this is proving to be such a toothy subject that I think I will need to break it up into parts. In Part One, we’ll discuss the property-change mechanisms that have the most exposure for markup writers, and for those of us that are using existing controls and classes rather than writing our own.There is plenty of room for multiple options, for articles that address multiple different audience expertise levels.Thanks for this article, it came in handy for me in a particular use case just now.This topic explains how the workings of the Windows Presentation Foundation (WPF) property system can affect the value of a dependency property, and describes the precedence by which aspects of the property system apply to the effective value of a property.This topic assumes that you understand dependency properties from the perspective of a consumer of existing dependency properties on WPF classes, and have read Dependency Properties Overview.Windows Presentation Foundation features quite a variety of different mechanisms that provide notifications of when a property changes its value.

These mechanisms come from several different feature areas: from data binding, from the WPF property system, and also from the cluster of features around styling, templating and controls.

) XAML and support for defining entire UIs in XAML markup is a big draw of using WPF as an application programming foundation.

So, wouldn’t it be nice if there was a way of responding to user-driven property changes that affect the UI, without even needing to write any code at all?

In fact, Dependency Properties are faster if you look up the documentation in MSDN.

Now, I don't know whether the approach documented in this article is still faster, it may just be the typical use of Dependency Properties that is faster rather than this slight variation. But I definitely like having yet another option pointed out.

The following is example XAML where the same property (Background) has three different "set" operations that might influence the value.