Validation

How to do Validation in Windows and Uno Platform Applications – the Easy Way

by

Quite often I hear the complaint that WinUI, and thus Uno Platform, doesn’t include validation. There was some evidence a while ago that it was being worked on by the WinUI team (ie commented out validation XAML in the WinUI styles), but there doesn’t seem to be any more progress in this area, despite a … Read more

Custom Validation Attributes and Multi-Language Resource Loading for Validation with INotifyDataErrorInfo for XAML Applications (UWP, WinUI, Uno)

by

I think this will be the last in the series of posts covering validation using the INotifyDataErrorInfo interface, which can be used to expose validation error messages directly in your XAML. In this post we’re going to look at adding custom validation using both the CustomValidationAttribute and by creating our own ValidationAttribute. We’ll also look … Read more

Customising Error Messages with INotifyDataErrorInfo Validation for XAML Applications (UWP, WinUI, Uno)

by

In my previous post, Adding Validation to a XAML Control Using INotifyDataErrorInfo, I walked through adding validation to a view model using the INotifyDataErrorInfo interface and the Community Toolkit. This post will pick up where that post left off and look at how you can customise the error message that gets displayed. This will improve … Read more

Adding Validation to a XAML Control Using INotifyDataErrorInfo and the CommunityToolkit for WinUI, WPF, UWP and Uno

by

In my previous post on Building a XAML UserControl I made use of the CommunityToolkit.Mvvm (formerly Microsoft.Toolkit.Mvvm) NuGet package to provide the implementation of INotifyPropertyChanged used to data bind properties of our view model to the XAML controls. In this post we’re going to again use the community toolkit but this time we’re going to … Read more