CODEWITHSUNDEEP
c#wpfxaml
user857521
user857521

Reputation:

How to access Combobox.ItemSource properties within DataGridTemplateColumn

if I have DataGridComboBoxColumn in XAML

<DataGridComboBoxColumn Header="Department Id" x:Name="comboboxColumn1"

I can refer to the comboboxColumn1.Itemsource in code using 

comboboxColumn1.ItemsSource = comboboxSource;

If I now use DataGridTemplateColumn instead...

<DataGridTemplateColumn x:Name="Col2" Header="name">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <ComboBox x:Name="Combobox2" />
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
    </DataGridTemplateColumn>
</DataGrid.Columns>

how do I then set the Combobox2.ItemSource in code?

Upvotes: 0

Views: 592

Answers (1)

Rachel
Rachel

Reputation: 132568

Does it have to be in code behind??

You are building a DataTemplate, which is the template used anytime WPF needs to render that specific DataGridCell. Therefore, there is never a single instance of your ComboBox, but rather as many instances as you have DataGridCells being displayed (which is why you can't actually reference the item by Name).

If I had to set the ItemsSource in code-behind, I would just put a Loaded event on the ComboBox and set it there.

Or if the ItemsSource is not static, then you can use the ItemContainerGenerator to get the template for a specific DataGrid item, and find it through that.

But really you should set the ItemsSource in the XAML using a StaticResource, or a binding if you can, so I'd suggest figuring out how to set the binding through the XAML using a RelativeSource or ElementName binding to find whatever object contains your ItemsSource first, and only settling for using code-behind if you absolutely have to.

Also, the reason why comboboxColumn1.ItemsSource = comboboxSource; works is because you're setting DataGridComboBoxColumn.ItemsSource, not ComboBox.ItemsSource, and there's only a single object named comboboxColumn1

Upvotes: 2

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