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

Annotating data

The .NET Framework also provides us with an alternative, attribute-based validation system in the System.ComponentModel.DataAnnotations namespace. It is mostly comprised of a wide range of attribute classes that we can decorate our data model properties with, to specify our validation rules. In addition to these attributes, it also includes a few validation classes, which will investigate later.

As an example, let's look at replicating the current validation rules from our Product class with these data annotation attributes. We need to validate that the Name property is entered and has a length of twenty-five characters or less, and that the Price property is more than zero. For the Name property, we can use the RequiredAttribute and the MaxLengthAttribute.

[Required(ErrorMessage = "Please enter the product name.")] 
[MaxLength(25, ErrorMessage = "The product name cannot be longer than  
  twenty-five characters.")] 
public string Name 
  get { return...