Book Image

Mastering Windows Presentation Foundation

By : Sheridan Yuen
Book Image

Mastering Windows Presentation Foundation

By: Sheridan Yuen

Overview of this book

Windows Presentation Foundation is rich in possibilities when it comes to delivering an excellent user experience. This book will show you how to build professional-grade applications that look great and work smoothly. We start by providing you with a foundation of knowledge to improve your workflow – this includes teaching you how to build the base layer of the application, which will support all that comes after it. We’ll also cover the useful details of data binding. Next, we cover the user interface and show you how to get the most out of the built-in and custom WPF controls. The final section of the book demonstrates ways to polish your applications, from adding practical animations and data validation to improving application performance. The book ends with a tutorial on how to deploy your applications and outlines potential ways to apply your new-found knowledge so you can put it to use right away.
Table of Contents (19 chapters)
Mastering Windows Presentation Foundation
About the Author
About the Reviewer
Customer Feedback

Chapter 8. Implementing Responsive Data Validation

Data validation goes hand in hand with data input forms and is essential to promote clean, usable data. While the UI controls in WPF can automatically validate that entered values match the type of their data bound properties, they cannot validate for the correctness of the entered data.

For example, a TextBox control that is data bound to an integer may highlight an error if a user entered a non-numeric value, but it wouldn't validate that the entered number had the correct number of digits in, or that the first four digits were appropriate for the type of credit card specified.

In order to validate these types of data correctness when using MVVM, we'll need to implement one of the .NET validation interfaces. In this chapter, we'll thoroughly examine the available interfaces, looking at a number of implementations and explore the other validation related features that WPF provides us with. Let's start by looking at the validation system.