How do I get access to the property of children inside of a DataGrid by the x:Name in WPF?

Question

I want to control the children's elements of a DataGrid in WPF for example a ComboBox, like an ordinary element like this: ComboBox1.Text = "test";

What have I tried :

<Grid x:Name="mygrid">  
     <DataGrid x:Name="MainDataGrid">  
      
                <DataGrid.Columns>  
                    <DataGridTextColumn Header="The Name :" Width="120" Binding="{Binding NAMES, UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" />  
      
                    <DataGridTemplateColumn Header="CMB" Width="150">  
                        <DataGridTemplateColumn.CellTemplate>  
                            <DataTemplate>  
                                <ComboBox x:Name="ComboBox1"  
                                      
                                      SelectedValuePath="CODE"  
                                      DisplayMemberPath="NAMES"  
                                      IsTextSearchEnabled="True"  
                                      SelectedIndex="0"  
                                      IsEditable="False"  
                                      SelectionChanged="ComboBox1_SelectionChanged"  
                                      BorderBrush="#FFADEEB4" Background="{x:Null}" BorderThickness="1">  
      
                                    <ComboBox.ItemsPanel>  
                                        <ItemsPanelTemplate>  
                                            <VirtualizingStackPanel VirtualizingPanel.IsVirtualizing="True" VirtualizingPanel.VirtualizationMode="Recycling"/>  
                                        </ItemsPanelTemplate>  
                                    </ComboBox.ItemsPanel>  
                                </ComboBox>  
                            </DataTemplate>  
                        </DataGridTemplateColumn.CellTemplate>  
                    </DataGridTemplateColumn>  
                </DataGrid.Columns>  
      
            </DataGrid>  
</Grid>  

CS:

private void Window_Loaded(object sender, RoutedEventArgs e)  
        {  
            
            var Test0 = this.FindName("ComboBox1");  
            var Test1 = mygrid.Children.OfType<ComboBox>().FirstOrDefault();  
            var Test2 = GetChildOfType<ComboBox>(mygrid);  
            var Test3 = FindChild<ComboBox>(Application.Current.MainWindow, "ComboBox1");  
  
        }  

All of the tests are Null!

Whats is the problem ?

Answer 1

@Mojtaba_Hakim , Welcome to Microsoft Q&A, you could try the following code to get the combox property in the DataTemplate.

 private void Window_Loaded(object sender, RoutedEventArgs e)  
        {  
            var combo = FindControl<ComboBox>(this, typeof(ComboBox), "ComboBox1");  
            Console.WriteLine(combo.Text);  
        }  
    public static T FindControl<T>(UIElement parent, Type targetType, string ControlName) where T : FrameworkElement  
        {  
  
            if (parent == null) return null;  
  
            if (parent.GetType() == targetType && ((T)parent).Name == ControlName)  
            {  
                return (T)parent;  
            }  
            T result = null;  
            int count = VisualTreeHelper.GetChildrenCount(parent);  
            for (int i = 0; i < count; i++)  
            {  
                UIElement child = (UIElement)VisualTreeHelper.GetChild(parent, i);  
  
                if (FindControl<T>(child, targetType, ControlName) != null)  
                {  
                    result = FindControl<T>(child, targetType, ControlName);  
                    break;  
                }  
            }  
            return result;  
        }  

Best Regards,
Jack

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