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What's a good method to bind Commands to Events? In my WPF app, there are events that I'd like to capture and process by my ViewModel but I'm not sure how. Things like losing focus, mouseover, mousemove, etc. Since I'm trying to adhere to the MVVM pattern, I'm wondering if there's a pure XAML solution.
Thanks!
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What's a Command? Commands are an implementation of the ICommand interface that is part of the . NET Framework. This interface is used a lot in MVVM applications, but it is useful not only in XAML-based apps.
The command is the action to be executed. The command source is the object which invokes the command. The command target is the object that the command is being executed on. The command binding is the object which maps the command logic to the command.
The INotifyPropertyChanged interface is used to notify clients, typically binding clients, that a property value has changed.
The RelayCommand and RelayCommand<T> are ICommand implementations that can expose a method or delegate to the view. These types act as a way to bind commands between the viewmodel and UI elements.
Use System.Windows.Interactivity
…xmlns:i=http://schemas.microsoft.com/expression/2010/interactivity…
<Slider
<i:Interaction.Triggers>
<i:EventTrigger EventName="ValueChanged">
<i:InvokeCommandAction
Command="{Binding MyCommand}"
CommandParameter="{Binding Text, ElementName=textBox}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</Slider>
Make sure your project references the assembly System.Windows.Interactivity.
Source: MSDN Blog Executing a command from an event of your choice
[Update] Have a look to to Microsoft.Xaml.Behaviors.Wpf (available since 03.12.2018) Official package by Microsoft.
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