Can I customize how validation errors look in the UI?

Absolutely. The skill provides XAML examples for custom ErrorTemplates and Style triggers to change borders, add icons, or show tooltips when a validation error occurs.

Does this skill cover asynchronous validation?

Yes, it provides a full implementation of INotifyDataErrorInfo, which is the primary way to handle long-running or server-side validation checks without freezing the UI.

Does this skill support the CommunityToolkit.Mvvm?

Yes, it includes specific patterns for using the ObservableValidator class from the CommunityToolkit.Mvvm (8.0+), which simplifies validation using DataAnnotations.

Which WPF validation method is recommended for modern applications?

INotifyDataErrorInfo is generally recommended for modern WPF apps because it supports asynchronous validation, multiple errors per property, and is the standard interface used by modern MVVM frameworks.

WPF Data Validation Guide

Name: WPF Data Validation Guide
Author: christian289

bychristian289

•

Developer Tools

Implements robust data validation patterns for WPF applications using modern .NET best practices and MVVM architecture.

This skill provides a comprehensive framework and implementation patterns for WPF data validation, ranging from simple XAML-based ValidationRules to advanced, enterprise-grade interfaces like INotifyDataErrorInfo. It enables developers to build professional, user-friendly forms with real-time feedback, supporting both synchronous and asynchronous validation workflows. Whether you are using traditional approaches or modern libraries like CommunityToolkit.Mvvm, this skill provides the necessary boilerplates and XAML templates to ensure data integrity and a polished UI experience.

Key Features

016 GitHub stars

02Implements IDataErrorInfo for standard ViewModel integration

03Supports ValidationRule for declarative XAML-side validation

04Integrates with CommunityToolkit.Mvvm ObservableValidator

05Includes customizable XAML ErrorTemplates for visual feedback

06Provides INotifyDataErrorInfo patterns for async and multi-error support

Use Cases

01Building data-entry heavy enterprise applications with uniform validation styling

02Validating complex user registration forms with real-time error reporting

03Implementing asynchronous server-side validation for unique usernames or IDs

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add christian289/dotnet-with-claudecode implementing-wpf-validation

For use in Claude.ai and ChatGPT

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