Can I pass event arguments from a trigger to my ViewModel?

Yes, by using InvokeCommandAction and setting PassEventArgsToCommand='True', the event arguments will be passed as a parameter to your ICommand.

What is the primary benefit of using WPF Behaviors?

Behaviors allow you to encapsulate and reuse UI logic across different controls without writing code-behind, which keeps your View and ViewModel cleanly separated.

What NuGet package is required for these features?

You need to install Microsoft.Xaml.Behaviors.Wpf, which is the official, open-source successor to the legacy System.Windows.Interactivity library.

How do I prevent memory leaks when creating custom behaviors?

Always override the OnDetaching() method in your behavior class to unhook any event handlers previously attached during the OnAttached() phase.

WPF Behaviors & Triggers

Name: WPF Behaviors & Triggers
Author: christian289

bychristian289

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Developer Tools

Implements interactive XAML behaviors and triggers using Microsoft.Xaml.Behaviors.Wpf to maintain clean MVVM architecture without code-behind.

About

This skill provides comprehensive patterns for using the Microsoft.Xaml.Behaviors.Wpf library to decouple UI logic from code-behind in .NET desktop applications. It enables developers to implement complex interactivity—such as EventToCommand patterns, data-driven UI changes, and reusable custom behaviors—while adhering to strict MVVM best practices. By providing templates for standard triggers and custom behavior implementations like drag-and-drop or focus management, it helps ensure WPF applications remain maintainable, testable, and memory-efficient.

Key Features

EventToCommand pattern implementation for MVVM
Data-driven UI state management via DataTriggers
6 GitHub stars
Custom reusable UI behaviors with DependencyProperties
Built-in actions for property changes and method calls
Memory-safe lifecycle management (OnAttached/OnDetaching)

Use Cases

Binding complex UI events like 'SelectionChanged' directly to ViewModel commands
Creating reusable 'FocusOnLoad' or 'SelectAllOnFocus' behaviors for forms
Implementing file drag-and-drop logic without polluting View code-behind

About

Key Features

EventToCommand pattern implementation for MVVM
Data-driven UI state management via DataTriggers
6 GitHub stars
Custom reusable UI behaviors with DependencyProperties
Built-in actions for property changes and method calls
Memory-safe lifecycle management (OnAttached/OnDetaching)

Use Cases

Binding complex UI events like 'SelectionChanged' directly to ViewModel commands
Creating reusable 'FocusOnLoad' or 'SelectAllOnFocus' behaviors for forms
Implementing file drag-and-drop logic without polluting View code-behind