CODEWITHSUNDEEP
c#wpfxamlmvvmuser-controls
Tomtom
Tomtom

Reputation: 9384

Set property in ViewModel within other View

I have a WPF-Application with a Window and a UserControl. The UserControl is implemented with the MVVM-Pattern. So in the view I have a Label which displays the value of a string-property called InfoMessage in the ViewModel.

In the Window I added an instance of this UserControl by

<views:ItemInfoView Grid.Row="3" Grid.Column="1" x:Name="itemInfoView"/>

Now I want to set the InfoMessage from the XAML of my Window. Currently I have no idea how to achieve this in xaml. In code-behind I could access the DataContext of my control and cast it to ItemInfoViewModel and the set the value like:

((ItemInfoViewModel)itemInfoView.DataContext).InfoMessage = "Hello World";

But I hope there's a way to do this in pure XAML. Does anyone know if this is possible and how?

Upvotes: 1

Views: 431

Answers (1)

Lennart
Lennart

Reputation: 10324

You need to add a Dependency Property to your user control:

// Your property
public string InfoMessage{get;set;}

// Register Dependency Property
public static readonly DependencyProperty InfoMessageProperty =
DependencyProperty.Register("InfoMessage", typeof(string), typeof(ItemInfoView),
        new UIPropertyMetadata(true));

Then you should be able to just set or bind InfoMessage directly:

<views:ItemInfoView Grid.Row="3" Grid.Column="1" InfoMessage="Whatever"/>

Upvotes: 5

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