How to open the DropDown with a single click in the GridComboBoxColumn in WPF DataGrid?

You can open the DropDown with a single click in the GridComboBoxColumn by deriving a new class from the GridCellComboBoxRenderer and overriding the OnEditElementLoaded virtual method as follows.

 C# 

public class ComboBoxRenderer : GridCellComboBoxRenderer
{
    protected override void OnEditElementLoaded(object sender, System.Windows.RoutedEventArgs e)
        {
            base.OnEditElementLoaded(sender, e);
            var combobox = sender as ComboBox;
            combobox.IsDropDownOpen = true;
        }
}

Refer to the following code example to remove the default GridCellComboBoxRenderer and add the customized GridCellComboBoxRendererExt to the SfDataGrid.CellRenderer collection and Set EditTrigger as OnTap in SfDataGrid.

C#

public MainWindow()
        {
            InitializeComponent();
            //Default combobox cell renderer is removed.
            this.sfgrid.CellRenderers.Remove("ComboBox");
            //Customized combobox cell renderer is added.
            this.sfgrid.CellRenderers.Add("ComboBox", new ComboBoxRenderer()); 
        }

Xaml

  <syncfusion:SfDataGrid Name="sfgrid"
                               AllowEditing="True"
                               AutoGenerateColumns="False"
                               ColumnSizer="SizeToHeader"
                               EditTrigger="OnTap"
                               ItemsSource="{Binding StoreLists}">

Samples

WPF

WinRT

UWP

Conclusion

I hope you enjoyed learning about how to open the DropDown with a single click in the GridComboBoxColumn in WPF DataGrid.

You can refer to our WPF SfDataGrid feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our WPF SfDataGrid example to understand how to create and manipulate data.

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