WPF Databinding Link Textblock text to Combobox Selection - wpf

Question

I have this xaml in my datagrid:
<DataGridTemplateColumn Header="Status" Width="*" IsReadOnly="False">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock x:Name="StatusText" Text="{Binding Description}"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<ComboBox
ItemsSource="{Binding Source={StaticResource StatusItems}}"
SelectedValue="{Binding Status, UpdateSourceTrigger=PropertyChanged, NotifyOnSourceUpdated=True}"
DisplayMemberPath="Description"
SelectedValuePath="Status"
x:Name="Combo"
/>
</StackPanel>
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
When i change the value of the combobox, the dataset updates perfectly, but the textblock text doesn't update to the new value I have to refill the entire dataset for the textblock to match the newly selected combobox value. I see the correct method is to implement INotifyPropertyChanged, but that would require significant changes to the way the app fills the dataset, at least from what i understand reading similar posts. I don't have a model that i can implement on, i'm wondering if i can simply set a trigger on the textblock that will change the value whenever the combobox selection changes.
Here is how i am filling the datagrid, if someone knows how i can modify this to implement INotifyPropertyChanged, that would also be great, but i don't think that will work without a model defined (again, just going on what i see others doing).
Dim con As New SqlConnection(str)
Dim ds As New DataSet()
Dim Adpt As New SqlDataAdapter
Adpt.SelectCommand = New SqlCommand(com, con)
con.Open()
Adpt.Fill(ds, "dbo.tmfCNCComponent_threed")
dataGrid1.ItemsSource = ds.Tables("dbo.tmfCNCComponent_threed").DefaultView
con.Close()

Answer 1

Add this attribute to the ComboBox: IsSynchronizedWithCurrentItem="False". By default, CollectionViewSource tracks the selected item in a selector (e.g. ComboBox, ListBox, etc.). If you use the same CollectionViewSource for multiple controls, it will impose the same selection on all of them unless you explicitly prevent that. If you're using the same collection with multiple selectors, there are cases where you want them all to synchronize the selected item. This is not one of those cases.
You need a read-only CellTemplate and an editable CellEditingTemplate. We can use the same template for both, with a ComboBox that's disabled when the cell isn't being edited.
Result:
<DataGrid x:Name="DataGrid" AutoGenerateColumns="False" CellEditEnding="DataGrid_CellEditEnding">
<DataGrid.Resources>
<DataTemplate x:Key="StatusColumnTemplate">
<ComboBox
ItemsSource="{Binding Source={StaticResource StatusItems}}"
SelectedValue="{Binding Status, UpdateSourceTrigger=PropertyChanged}"
DisplayMemberPath="Description"
SelectedValuePath="Status"
IsSynchronizedWithCurrentItem="False"
IsEnabled="{Binding IsEditing, RelativeSource={RelativeSource AncestorType=DataGridCell}}"
/>
</DataTemplate>
</DataGrid.Resources>
<DataGrid.Columns>
<DataGridTemplateColumn
Header="Status Shared"
CellTemplate="{StaticResource StatusColumnTemplate}"
CellEditingTemplate="{StaticResource StatusColumnTemplate}"
/>
What you've got now clearly can't work because the grid rows don't have a Description column.
NotifyOnSourceUpdated=True has nothing to do with anything that's happening here.