CODEWITHSUNDEEP
c#.netwpfbinding
Rover
Rover

Reputation: 2230

How to bind Items to ItemsSource?

I want to show myElement.ContextMenu icons in separate panel. I'm trying to do this:

<ItemsControl ItemsSource="{Binding ElementName=myElement, Path=ContextMenu.ItemsSource}">
    <ItemsControl.ItemTemplate>
        <DataTemplate DataType="{x:Type MenuItem}">
            <Image Source="{Binding Icon}" />
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

But it shows me collection of MenuItems instead of Images. How can I do it without any ViewModels and manipulations in xxx.xaml.cs file.

Upvotes: 1

Views: 774

Answers (1)

Rachel
Rachel

Reputation: 132548

You are binding to ContextMenu.ItemsSource which is a different property than ContextMenu.Items

ItemsSource will only be set if you set it to something, such as a collection of objects, and if that is the case then your ItemsControl will also be bound to the same collection of objects. Unless the list of objects used in your ItemsSource is bound to has a property called Icon, your code will not work.

If you try to bind to ContextMenu.Items, you will get a collection of MenuItem objects, however UI objects can only have a single parent at a time, so your MenuItems can only exist in either your ContextMenu or your ItemsControl, and not both.

One possible option to do what you want is bind using a Converter, which will take the objects inside your ContextMenu, and make a copy of the Icon property, and return a collection of the images to display. It should be noted that this won't work until your ContextMenu is opened the first time because the MenuItems are not actually rendered until needed.

<ItemsControl ItemsSource="{Binding ElementName=MyObjectWithContextMenu, 
    Converter={StaticResource MyConverter}}" />

where MyConverter takes the object passed to it, gets the object's ContextMenu, loops through each MenuItem in ContextMenu.Items, stores a copy of the Icon property in a List<T>, then returns the List.

Upvotes: 1

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