How to set ItemsPanelTemplate to a dynamically created Grid in code behind

Question

I've got this UserControl defined in XAML and would like to set the ItemsPanelTemplate dynamically in my code behind class (not in the XAML like in the example):

<UserControl>
    <ItemsControl x:Name="Items">
        <ItemsControl.ItemsPanel>
            <ItemsPanelTemplate>
                <Grid> <!-- I want to add this Grid definition in code behind -->
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition />
                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition />
                    </Grid.RowDefinitions>
                </Grid>
            </ItemsPanelTemplate>
       </ItemsControl.ItemsPanel>
    </ItemsControl>
</UserControl>

I tried something like

this.Items.ItemsPanel.Template = new Grid();

but failed miserably. Any help?

Background: I only know the number of grid columns and rows at runtime.

Answer 1

You can do as you want by creating MannualCode in code behind as: 1. Create a Method as following which will return a ItemsPanelTemplate

     private ItemsPanelTemplate GetItemsPanelTemplate()
    {
        string xaml = @"<ItemsPanelTemplate   xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'>
                            <Grid>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition />
                                </Grid.ColumnDefinitions>
                                <Grid.RowDefinitions>
                                    <RowDefinition />
                                </Grid.RowDefinitions>
                            </Grid>
                    </ItemsPanelTemplate>";
        return XamlReader.Parse(xaml) as ItemsPanelTemplate;
    }

1. Now add this template in your Listbox ItemsPanel as:

      MyListBox.ItemsPanel = GetItemsPanelTemplate();
   

This is working fine for me. Hope this will help.

Keep Coding....:)