How to access DataGrid in RowDetail by name in WPF ?

Question

I'm using C# WPF ,

I want to access item's of datagrid in row detail of the main datagrid , but I can't :

Please help me

Answer 1

gvPrintDetail is the nested grid in XAML ,Main grid should have LoadingRowDetails event on click of the expander ,loading row details event is fired

  public DataGrid gvPrintDetail = new DataGrid();  
      
    private void MainGrid_LoadingRowDetails(object sender, DataGridRowDetailsEventArgs e)  
            {  
                try  
                {  
                      
                    DataRowView row = MainGrid.SelectedItem as DataRowView;  
                    lsStageId = row["STAGE"].ToString();  
                    lsDocNum = row["DOC_NO"].ToString();  
                    lsOrgDup = row["ORG_DUP"].ToString();  
                    gvPrintDetail = (DataGrid)e.DetailsElement.FindName("gvPrintDetail");  
                     
                }              
                 catch (Exception ex)  
                {  
                    MessageBox.Show(ex.Message);  
                }  
      
            }  

Answer 2

For accessing the controls in the DataTemplate, you could try the code below.
Xaml:

 <Window.DataContext>  
        <local:ViewModel/>  
    </Window.DataContext>  
    <StackPanel>  
        <DataGrid Name="dg1" AutoGenerateColumns="False" SelectionMode="Single" CanUserAddRows="false"   
                  CanUserDeleteRows="False" SelectionUnit="FullRow" ItemsSource="{Binding View}" >  
            <DataGrid.CellStyle>  
                <Style TargetType="DataGridCell">  
                    <Setter Property="BorderThickness" Value="0"/>  
                </Style>  
            </DataGrid.CellStyle>  
            <DataGrid.RowHeaderTemplate>  
                <DataTemplate>  
                    <Expander Expanded="Expander_Expanded" Collapsed="Expander_Collapsed">  
                    </Expander>  
                </DataTemplate>  
            </DataGrid.RowHeaderTemplate>  
            <DataGrid.Columns>  
                <DataGridTextColumn Header="ID" IsReadOnly="True" Width="100" Binding="{Binding ID}" />  
                <DataGridTextColumn Header="Name" IsReadOnly="True" Width="100" Binding="{Binding Name}" />  
            </DataGrid.Columns>  
            <DataGrid.RowDetailsTemplate>  
                <DataTemplate>  
                    <DataGrid x:Name="dg" ItemsSource="{Binding Details}" Initialized="dg_Initialized"  >  
                        <DataGrid.Columns>  
                            <DataGridTextColumn  IsReadOnly="True" Width="100" Binding="{Binding Title}" />  
                            <DataGridTextColumn Header="Address" IsReadOnly="True" Width="100" Binding="{Binding Address}" />  
                        </DataGrid.Columns>  
                    </DataGrid>  
                </DataTemplate>  
            </DataGrid.RowDetailsTemplate>  
        </DataGrid>  

    </StackPanel>  

Codebehind:

 public partial class MainWindow : Window  
  {  

    public MainWindow()  
    {  
      InitializeComponent();  

    }  
    private void Expander_Expanded(object sender, RoutedEventArgs e)  
    {  
      for (var vis = sender as Visual; vis != null; vis = VisualTreeHelper.GetParent(vis) as Visual)  
        if (vis is DataGridRow)  
        {  
          var row = (DataGridRow)vis;  
          row.DetailsVisibility = row.DetailsVisibility == Visibility.Visible ? Visibility.Collapsed : Visibility.Visible;  
          break;  
        }  


    }  

    private void Expander_Collapsed(object sender, RoutedEventArgs e)  
    {  
      for (var vis = sender as Visual; vis != null; vis = VisualTreeHelper.GetParent(vis) as Visual)  
        if (vis is DataGridRow)  
        {  
          var row = (DataGridRow)vis;  
          row.DetailsVisibility = row.DetailsVisibility == Visibility.Visible ? Visibility.Collapsed : Visibility.Visible;  
          break;  
        }  
    }  
    public IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject  
    {  
      if (depObj != null)  
      {  
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)  
        {  
          DependencyObject child = VisualTreeHelper.GetChild(depObj, i);  

          if (child != null && child is T)  
            yield return (T)child;  

          foreach (T childOfChild in FindVisualChildren<T>(child))  
            yield return childOfChild;  
        }  
      }  
    }  

    private void dg_Initialized(object sender, System.EventArgs e)  
    {  
      foreach (var datagrid in FindVisualChildren<DataGrid>(this))  
      {  
        if (datagrid.Name == "dg")  
        {  

          datagrid.Columns[0].Header = "MyTitle";  
          datagrid.AutoGenerateColumns=false;  
          datagrid.CanUserAddRows = true;  
          datagrid. CanUserDeleteRows =true;  
        }  
      }  
    }  
  }  

The result:

---

If the response is helpful, please click "Accept Answer" and upvote it.
 Note: Please follow the steps in our [documentation][5] to enable e-mail notifications if you want to receive the related email notification for this thread. 

[5]: https://learn.microsoft.com/en-us/answers/articles/67444/email-notifications.html