Highlighting the selected Item in WPF Datagrid

Question

my question seems to be an easy task but somehow all the things i tried won't give me the desired result.

In my MainWindow i have a ContentControl that binds to a variable called "CurrentView", wich is a ViewModel. I switch the CurrentView via a Navigationbar. In my first View there is a DataGrid. When i click on an element on that DataGrid the Row gets highlighted in Blue and the selected Item gets saved in my ViewModel.

When i now jump to a new View, and back to the first View the selected Item is still selected in the DataGrid, but the Row is not highlighted…

I tried so many Things but somehow i cant get the Row Highlighted.

Is there something im missing?

Answer 1

You need to focus the DataGrid for the selected row to become highlighted by default. You could for example call the Focus() method of the DataGrid in a Loaded event handler for the view that you are navigating to:

public partial class View1 : UserControl
{
    public View1()
    {
        InitializeComponent();
        Loaded += (s, e) => dataGrid1.Focus();
    }
}

Answer 2

AFAIK you need focus on the specific row. I use this behaviour:

using System.Windows; using System.Windows.Controls; using System.Windows.Input; using System.Windows.Interactivity;

namespace blaa
{
class DataGridRowBehavior : Behavior<DataGridRow>
{
    public static bool GetIsDataGridRowFocussedWhenSelected(DataGridRow dataGridRow)
    {
        return (bool)dataGridRow.GetValue(IsDataGridRowFocussedWhenSelectedProperty);
    }

    public static void SetIsDataGridRowFocussedWhenSelected(
      DataGridRow dataGridRow, bool value)
    {
        dataGridRow.SetValue(IsDataGridRowFocussedWhenSelectedProperty, value);
    }

    public static readonly DependencyProperty IsDataGridRowFocussedWhenSelectedProperty =
        DependencyProperty.RegisterAttached(
        "IsDataGridRowFocussedWhenSelected",
        typeof(bool),
        typeof(DataGridRowBehavior),
        new UIPropertyMetadata(false, OnIsDataGridRowFocussedWhenSelectedChanged));

    static void OnIsDataGridRowFocussedWhenSelectedChanged(
      DependencyObject depObj, DependencyPropertyChangedEventArgs e)
    {
        DataGridRow item = depObj as DataGridRow;
        if (item == null)
            return;

        if (e.NewValue is bool == false)
            return;

        if ((bool)e.NewValue)
            item.Selected += OndataGridRowSelected;
        else
            item.Selected -= OndataGridRowSelected;
    }
    static void OndataGridRowSelected(object sender, RoutedEventArgs e)
    {
        DataGridRow row = e.OriginalSource as DataGridRow;
        // If focus is already on a cell then don't focus back out of it
        if (!(Keyboard.FocusedElement is DataGridCell) && row != null)
        {
            row.Focusable = true;
            Keyboard.Focus(row);
        }
    }

  }
}

Usage:

        <DataGrid.RowStyle>
            <Style TargetType="{x:Type DataGridRow}">
                <Setter Property="local:DataGridRowBehavior.IsDataGridRowFocussedWhenSelected" Value="true"/>
            </Style>
        </DataGrid.RowStyle>