Get Grid Cell by mouse click

Question

I have a WPF Grid which is divided into 3 rows and 3 columns, i wasn't able to find a way of getting the row and column number of mouse click on the net, ohh and if it is possible it will be better for my program that this part will be in code and not XAML, this is my simple grid:

  <Grid Name="GridCtrl" ShowGridLines="True">
     <Grid.RowDefinitions>
        <RowDefinition Height="3*" />
        <RowDefinition Height="3*" />
        <RowDefinition Height="3*" />
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="3*" />
        <ColumnDefinition Width="3*" />
        <ColumnDefinition Width="3*" />
   </Grid.ColumnDefinitions>
  </Grid>

Answer 1

Faced with the same problem I came up with this solution:

XAML:

<Grid Name="myGrid" Background="Transparent" PreviewMouseLeftButtonDown="OnPreviewMouseLeftButtonDown">

NOTE: The Grid has to be given a background to raise the mouse down event, see: How to get a Grid to raise MouseDown events when no UIElemets in cells clicked?

Code-behind:

private void OnPreviewMouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
    if(e.ClickCount == 2) // for double-click, remove this condition if only want single click
    {
        var point = Mouse.GetPosition(myGrid);

        int row = 0;
        int col = 0;
        double accumulatedHeight = 0.0;
        double accumulatedWidth = 0.0;

        // calc row mouse was over
        foreach (var rowDefinition in myGrid.RowDefinitions)
        {
            accumulatedHeight += rowDefinition.ActualHeight;
            if (accumulatedHeight >= point.Y)
                break;
            row++;
        }

        // calc col mouse was over
        foreach (var columnDefinition in myGrid.ColumnDefinitions)
        {
            accumulatedWidth += columnDefinition.ActualWidth;
            if (accumulatedWidth >= point.X)
                break;
            col++;
        }

        // row and col now correspond Grid's RowDefinition and ColumnDefinition mouse was 
        // over when double clicked!
    }
}