Only execute WPF MouseDoubleClick event when DataGrid row is clicked

Question

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?

Eirik · Accepted Answer · 2012-07-27 08:26:05Z

8

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..
    }
}

answered Jul 27, 2012 at 8:26

Eirik

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6 Comments

LPL Over a year ago

I think this will not work. There are many ContentPresenter in DataGrid (not only for rows) and you can't be sure that a ContentPresenter is a direct Parent of e.OriginalSource.

Eirik Over a year ago

I have used this approach with success before. The point is that if the direct Parent of e.OriginalSource is a ContentPresenter you can assume the user clicked on a row or an object in one of the columns of that row and thus you can get the selected row. If it is something else, like a Border or Grid, just ignore it. Do you have any examples where this could go wrong?

LPL Over a year ago

I havn't tried. This was my thinking only. I mean a ContentPresenter is not an indication for a row. Does that really not fire on ColumnHeaders and ScrollBars? And what if Template isn't default?

Eirik Over a year ago

The Parent of a ColumnHeader is Grid and ScrollBar is either RepeatButton or Thumb. I guess you could probably edit the Template to produce undesired results with this method, but I'm sure you could just adjust it accordingly? I haven't been able to make it fail yet, but I don't know if this way of doing it is bullet proof. If it isn't I would like to know :)

Xilmiki Over a year ago

ContentPresenter Don't Work (There are many ContentPresenter in DataGrid es: Headers)

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LPL · Accepted Answer · 2012-07-26 18:01:31Z

7

Yes, register the event in RowStyle.

<DataGrid.RowStyle>
    <Style TargetType="{x:Type DataGridRow}">
        <EventSetter Event="PreviewMouseDoubleClick" Handler="Row_PreviewMouseDoubleClick" />
    </Style>
</DataGrid.RowStyle>

answered Jul 26, 2012 at 18:01

LPL

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3 Comments

Mark Over a year ago

What is the overhead of adding an eventsetter to every row in the data grid?

LPL Over a year ago

I think nothing to speak of because there is only one handler instance for all rows.

B.K. Over a year ago

Well done! Works great and I see no performance degradation (in regards what Mark asked).

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