Lesson 27 - DependencyProperties in C# .NET WPF
In first WPF lessons, we've learned about principles
of data binding and the
INotifyPropertyChanged interface. We
know that these are powerful tools and are even necessary to build more robust
applications. Otherwise, manually, it'd be very difficult to make sure form data
are up-to-date with the data in the application.
In addition to
INotifyPropertyChanged, WPF has another tool that
can also automatically respond to value changes of a property. This tool is
called Dependency Properties.
WPF went for it from scratch and came up with an innovation of C# properties. The concept of Dependency Properties is much more complex and powerful.
All WPF controls are built on Dependency Properties internally.
That's so they can support data binding even in the opposite direction. This way
it's internally possible that a
TextBlock changes its
Text, which is a
DependencyProperty and not a common
property, as we've probably thought so far.
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We'll talk about what can DependencyProperties in WPF do extra than classic C# properties in combination with INotifyPropertyChanged and where to use them.
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