How Can I Change an ItemsPanelTemplate in Code Behind?

Question

<ItemsControl>        
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <Grid />
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
</ItemsControl>

If I want to change the ItemsPanelTemplate from the default (StackPanel) to a Grid, I do the above in XAML. How could I achieve the same thing in code?

I read this here but couldn't figure it out.

Answer 1

I'd prefer to do this in the default style of the custom control inside Generic.xaml, but if you want a pure C# way, here is how it can be done -

private void ApplyGridAsItemsPanel()
{
    MyItemsControl.ItemsPanel = ParseItemsPanelTemplate(typeof(Grid));

    ItemsPanelTemplate ParseItemsPanelTemplate(Type panelType)
    {
        var itemsPanelTemplateXaml =
            $@"<ItemsPanelTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
                                  xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'>
                   <{panelType.Name} />
               </ItemsPanelTemplate>";

        return (ItemsPanelTemplate)XamlReader.Load(itemsPanelTemplateXaml);
    }
}