How to I bind controls in a UWP DataGrid Column Header template to instances of a class?

Question

I'm trying to customise the header content of a UWP DataGrid. I can add the necessary controls by changing the header style like this, however I want to be able to bind the controls inside the template to instances of a class that are only available when the grid columns are (dynamically) created.

How do I make the binding in the code below valid (or another workaround)?

DataGrid example XAML:

<controls:DataGrid    
    x:Name="DataGrid"
    ItemsSource="{x:Bind ItemsSource}"
    AutoGenerateColumns="False"
    ColumnHeaderHeight="80">

    <controls:DataGrid.ColumnHeaderStyle>
        <Style TargetType="controlsprimitives:DataGridColumnHeader">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="controlsprimitives:DataGridColumnHeader">

                        <StackPanel Orientation="Vertical">

                            <TextBox Text="{x:bind PropertyOnMyClass, Mode=TwoWay}"/>

                            <!-- Some other controls -->

                        </StackPanel>

                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </controls:DataGrid.ColumnHeaderStyle>

</controls:DataGrid>

Example of a column being added:

private void MakeColumn(MyClass classInstance)
{
    DataGridTextColumn column = new();
    column.Header = classInstance;
    DataGrid.Columns.Add(column);
}

I can add controls in the way above with no issue, and I can set the DataGridTextColumn Header property to the class instance and set the header text using a GetString() override on the class, but I can't find a way to bind to multiple properties.

A solution that creates the header controls in codebehind would also be fine, however you can't create Templates in codebehind.

Thanks in advance.

Answer 1

So my workaround was to call a method the first time the control loads to set the necessary links between the controls and the class:

XAML:

        <controls:DataGrid.ColumnHeaderStyle>
            <Style
            TargetType="controlsprimitives:DataGridColumnHeader">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="controlsprimitives:DataGridColumnHeader">
                            <ContentPresenter Loaded="HeaderLoaded"/>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </controls:DataGrid.ColumnHeaderStyle>

and code behind:

        private void HeaderLoaded(object sender, RoutedEventArgs e)
        {
            var presenter = sender as ContentPresenter;
            if (presenter.DataContext is MyClassType myClassInstance)
            {
                presenter.Content = new ColumnHeader(myClassInstance, this);                
            }
            presenter.Loaded -= HeaderLoaded;
        }