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

Incorporating multiple validation techniques

Now that we've had a good look at the two validation interfaces, the data annotation attributes and the ability to validate with different levels, let's take a look at how we can amalgamate these different techniques together.

Let's create a BaseNotifyValidationModel class by copying what we have in our previous implementation, to incorporate these new additions. First, we need to add some extra using directives to the ones used in the previous implementation:

using System.Collections.ObjectModel; 
using System.Collections.Specialized; 
using System.ComponentModel.DataAnnotations; 
using CompanyName.ApplicationName.DataModels.Enums; 

Next, we need to add our validationLevel and errors fields:

private ValidationLevel validationLevel = ValidationLevel.Full; 
protected ObservableCollection<string> errors =  
  new ObservableCollection<string>(); 

We need to add a constructor, in which we attach the ExternalErrors_CollectionChanged...