August 2012
Intermediate to advanced
490 pages
9h 14m
English
Content preview from MVVM Survival Guide for Enterprise Architectures in Silverlight and WPFBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Validation in MVVM-based applications
As mentioned in the introduction to this chapter, we have a lot of validation options to choose from in XAML-based technologies. Let's now take a look at the options that are best suited for use in MVVM applications.
Validation rules
This is the simplest and most commonly used validation technique. A WPF binding can be associated with a number of custom validation rules, each subclassed from ValidationRule. There are only two validation rules provided as part of the library: DataErrorValidationRule and ExceptionValidationRule.
Using validation rules
We can define additional custom validation rules by inheriting from ValidationRule. We can add them to the ValidationRules collection for a binding, as follows: ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.