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

Getting to grips with validation interfaces

In WPF, we have access to two main validation interfaces; the original one is the IDataErrorInfo interface and in .NET 4.5, the INotifyDataErrorInfo interface was added. In this section, we'll first investigate the original validation interface and its shortcomings and see how we can make it more usable, before examining the latter.

Implementing the IDataErrorInfo interface

The IDataErrorInfo interface is a very simple affair, with only two required properties to implement. The Error property returns the error message that describes the validation error and the Item[string] indexer returns the error message for the specified property.

It certainly seems straight forward enough, so let's take a look at a basic implementation of this interface. Let's create another base class to implement this in and for now, omit all other unrelated base class members, so that we can concentrate on this interface.

using System.ComponentModel; 
using System.Runtime...