Question

I’m making a WPF program which is able to color the rows in a DataGrid one by one in red using the for loop and I’ve encountered something weird. If the DataGrid has more than 40 rows of data from a database table, it doesn’t color all the rows.

Here’s the code I’m using.

private void Red_Click(object sender, RoutedEventArgs e)
{
    for (int i = 0; i < dataGrid1.Items.Count; i++)
    {
        DataGridRow row = (DataGridRow)dataGrid1.ItemContainerGenerator.ContainerFromIndex(i);
        if (row != null)
        {
            row.Background = Brushes.Red;
        }
    }
}

Is there any other way to color the rows one by one through other methods or is this some kind of fault in wpftoolkit?

Answer 1

If you want to define colours for each row and you have a property on the items the rows display you can use an ItemsContainerStyle to set the row colour. In the example below you would have a property called ItemColour on your items in the grid which would define the background row colour. The binding binds from the row to the item the row contains.

 <dg:DataGrid.ItemContainerStyle>
    <Style
       TargetType="{x:Type dg:DataGridRow}"
       BasedOn="{StaticResource {x:Type dg:DataGridRow}}">
       <Setter
          Property="Background"
          Value="{Binding ItemColour}" />
    </Style>
 </dg:DataGrid.ItemContainerStyle>

But you might not want a property ItemColour on your items as they might be your business model. This is where a ViewModel comes into its own. you define a middle layer that wraps your business layer and the ItemColour property based on some custom logic.