CODEWITHSUNDEEP
c#wpf
Rodion
Rodion

Reputation: 63

Bind UserControl to MainWindow element in WPF

I'm new in WPF and stack with problem. I have grid with DataContext bind to ListView selected item. It's work when all in one XAML file. How can i save binding after moving grid in UserControl?

UserControl:

<UserControl x:Class="Books.Views.BookView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:Books.Views"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid DataContext="{Binding SelectedValue, ElementName=booksGrid}">
...
    </Grid>
</UserControl>

MainWindow:

...
<ListView x:Name="booksGrid" ItemsSource="{Binding}">
...
<ContentControl Name="infoControl"
                    Grid.Row="0"
                    Grid.Column="1"
                    Content="{Binding}" />

Upvotes: 0

Views: 1212

Answers (1)

BradleyDotNET
BradleyDotNET

Reputation: 61339

You can't. booksGrid doesn't exist in the context of the user control.

Instead, declare a DependencyProperty (snippet propdp) on the UserControl

    public Book Book
    {
        get { return (Book)GetValue(BookProperty); }
        set { SetValue(BookProperty, value); }
    }

    // Using a DependencyProperty as the backing store for Book.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty BookProperty =
        DependencyProperty.Register("Book", typeof(Book), typeof(BookView), new PropertyMetadata(null));

Now you can bind your selected value to it:

MainWindow:

<BookView Book="{Binding SelectedValue, ElementName=booksGrid}"/>

In the UserControl itself you should manually set the correct properties in the property changed callback of the dependency property. Binding to the code property is unsafe as the setter for it is never called by the framework.

Upvotes: 1

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