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Mastering Windows Presentation Foundation

You're reading from   Mastering Windows Presentation Foundation Master the art of building modern desktop applications on Windows

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Product type Paperback
Published in Feb 2017
Publisher Packt
ISBN-13 9781785883002
Length 568 pages
Edition 1st Edition
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Author (1):
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Sheridan Yuen Sheridan Yuen
Author Profile Icon Sheridan Yuen
Sheridan Yuen
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Table of Contents (13) Chapters Close

Preface 1. A Smarter Way of Working with WPF 2. Debugging WPF Applications FREE CHAPTER 3. Writing Custom Application Frameworks 4. Becoming Proficient with Data Binding 5. Using the Right Controls for the Job 6. Mastering Practical Animations 7. Creating Visually Appealing User Interfaces 8. Implementing Responsive Data Validation 9. Completing That Great User Experience 10. Improving Application Performance 11. Deploying Your Masterpiece Application 12. What Next?

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...
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