Wpf – Only execute WPF MouseDoubleClick event when DataGrid row is clicked

datagriddouble-clickwpf

I have a DataGrid in WPF. When I double-click on a row, a query to a database should be executed.

This DataGrid has horizontal and vertical scroll bars, and I notice that when I click quickly on the arrow button of one of the scroll bars, it sends the query to the database.

The problem is that I am using the DataGrid's MouseDoubleClick event, so the scroll bars belong the the DataGrid, and when they are double-clicked, this event is raised.

Is there any way to execute the double click event only when I double click on a row of the DataGrid and not when I double-click on part of the scroll bars?

Best Answer

In your MouseDoubleClick event try doing this:

private void DataGridMouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    DependencyObject src = VisualTreeHelper.GetParent((DependencyObject)e.OriginalSource);

    // Checks if the user double clicked on a row in the datagrid [ContentPresenter]
    if (src.GetType() == typeof(ContentPresenter))
    {
        // Your logic..
    }
}

Related Solutions

WPF ListView ScrollViewer Double-Click Event

You can't change the behaviour, because the MouseDoubleClick handler is attached to the ListView control, so it has to occur whenever the ListView is clicked -- anywhere. What you can do it detect which element of the ListView first detected the double-click, and figure out from there whether it was a ListViewItem or not. Here's a simple example (omitting error checking):

private void lv_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
  DependencyObject src = (DependencyObject)(e.OriginalSource);
  while (!(src is Control))
    src = VisualTreeHelper.GetParent(src);
  Debug.WriteLine("*** Double clicked on a " + src.GetType().Name);
}

Note the use of e.OriginalSource to find the actual element that was double-clicked. This will typically be something really low level like a Rectangle or TextBlock, so we use VisualTreeHelper to walk up to the containing control. In my trivial example, I've assumed that the first Control we hit will be the ListViewItem, which may not be the case if you're dealing with CellTemplates that contain e.g. text boxes or check boxes. But you can easily refine the test to look only for ListViewItems -- but in that case don't forget to handle the case there the click is outside any ListViewItem and the search eventually hits the ListView itself.

WPF datagrid selected row clicked event

you can add the event handler in the ItemContainerStyle (which is the style applied to a row) :

<DataGrid ... >
    <DataGrid.ItemContainerStyle>
        <Style TargetType="DataGridRow">
            <EventSetter Event="MouseDoubleClick" Handler="Row_DoubleClick"/>
        </Style>
    </DataGrid.ItemContainerStyle>
    ...
</DataGrid>

Then, in the handler, you can check if the row is selected

private void Row_DoubleClick(object sender, MouseButtonEventArgs e)
{
    // execute some code
}

Best Answer

Related Solutions

WPF ListView ScrollViewer Double-Click Event

WPF datagrid selected row clicked event

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