CODEWITHSUNDEEP
c#wpfmvvmuser-controlsdependency-properties
Farmer
Farmer

Reputation: 10983

Access a UserControl property from another UserControl

I created a UserControl, which has a property called Hero

public partial class UcHeros : UserControl
{
    public UcHeros()
    {
        InitializeComponent();
        Hero = "Spiderman";
    }

    public static readonly DependencyProperty HeroProperty = DependencyProperty.Register("Hero", typeof(string), typeof(UcHeros), new PropertyMetadata(null));

    public string Hero
    {
        get { return (string)GetValue(HeroProperty); }
        set { SetValue(HeroProperty, value); }
    }
}

I'm using this UserControl inside a Window like this :

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        xmlns:wpfApplication1="clr-namespace:WpfApplication1"
        DataContext="{Binding RelativeSource={RelativeSource Self}}"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <StackPanel>
            <wpfApplication1:UcHeros x:Name="Superhero" />    
            <Button Click="OnClick">Click</Button>
        </StackPanel>
    </Grid>
</Window>

Now to get the Hero value I use this :

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    public static readonly DependencyProperty HumanProperty = DependencyProperty.Register("Human", typeof(string), typeof(MainWindow), new PropertyMetadata(null));

    public string Human
    {
        get { return (string)GetValue(HumanProperty); }
        set { SetValue(HumanProperty, value); }
    }

    private void OnClick(object sender, RoutedEventArgs e)
    {
        Debug.WriteLine(Superhero.Hero); 
    }
}

I can access to the Hero because I gived a name to that UserControl in my XAML declaration x:Name="Superhero", but how can I access to that value if I remove the Name property ?

I mean : How can I store the Hero value in the Human value using some sort of Binding !

Upvotes: 0

Views: 1615

Answers (1)

Sheridan
Sheridan

Reputation: 69959

Just Bind your Human property to the Hero property on your control:

<wpfApplication1:UcHeros Hero="{Binding Human, Mode=OneWayToSource}" />

Try using a OneWayToSource Binding if you just want to read the value and not update it.

UPDATE >>>

As @Killercam suggested, try setting the default value for your property in the declaration instead of the constructor:

public static readonly DependencyProperty HeroProperty = DependencyProperty.
    Register("Hero", typeof(string), typeof(UcHeros), 
    new PropertyMetadata("Spiderman"));

If that still doesn't work, then you've got something else going on there.

Upvotes: 2

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