Fluent Visual Basic® > 17. Dependency Properties > Fitting It In

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Table of Contents

Title Page

Acknowledgements

Contents

Tell Us What you think!

0. Introduction

1. Application Development

2. The .NET Platform

3. The Visual Studio UI

4. Test and Deploy

5. The Language, Part 1: Nouns

6. The Language, Part 2: Transitive Verbs

7. The Language, Part 3: Intransitive Verbs

8. Classes in the .NET Framework

9. Other Framework Types

10. The Class Library, Part 1

11. The Class Library, Part 2

12. OOA&D

13. Programming Principles

14. Patterns

15. XAML

16. WPF Controls

17. Dependency Properties

Fitting It In

Task List

Dependency Properties

Calculating DP Values

The Base Value

An Example

Review

Dependency Property Classes

More Classes

Creating Dependency Properties

Coerce Value Callbacks

Property Changed Callbacks

Registering Callbacks

A registration Example

Fitting It In

We’ve seen that .NET Framework types have four kinds of members: fields, properties, methods and events. Dependency properties don’t change that. Just like regular .NET properties, dependency properties are implemented using fields and properties. The magic happens when you register the property with the dependency property system and use WPF GetValue() and SetValue() to change the value of the backing field instead of setting the value directly.

Remember that a private field that stores the values associated with a standard .NET property is called a BACKING FIELD. In WPF, the field associated with the property is the dependency property, and it is said to WRAP the standard .NET property, not BACK it. It’s a difference in perspective that’s reflected in the terminology.

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Contents

Fitting It In