Hello Hilma Maria,

I have been looking into your question and after investigation found this forum thread where a similar question about customizing the ColumnSeries column colors in the XamDataChart  has been discussed. I have also created a small sample application that demonstrates the suggested approach there and sets column fill colors based on their items’ brush property.

To sum up, in order to set the column color based on some item’s property, you need to first set the IsCustomCategoryStyleAllowed property on the ColumnSeries to "True" and handle the AssigningCategoryStyle event on the same series. This event is fired for every column and the corresponding item can be retrieved from the event arguments by calling the GetItems method. The column color can be set by assigning the item’s brush property to the event arguments’ Fill property:

private void ColumnSeries_AssigningCategoryStyle(object sender, Infragistics.Controls.Charts.AssigningCategoryStyleEventArgs args)
     {
            SampleData currentColumn = args.GetItems(args.StartIndex, args.EndIndex)[0] as SampleData;
            Console.WriteLine(currentColumn.Value.ToString() + " " + currentColumn.ColumnBrush.ToString());
            args.Fill =currentColumn.ColumnBrush;
        }

You can find the sample attached below. Please, test it on your side and let me know if I may be of any further assistance.

Sincerely,

Bozhidara Pachilova

Associate Software Developer

1030.XDCColumnSeriesColorBinding.zip

I have been looking into binding the AssigningCategoryStyle event to a command and determined that the event is indeed not fired. What I can suggest instead is using a Behavior. This will allow you to handle the event in a separate file and attach it to the corresponding control and thus maintain the MVVM pattern. You can check out this blog post about Behaviors in WPF, if you are interested.

The behavior can be defined as follows:

public class AssigningCategoryStyleBehavior : Behavior<ColumnSeries>
    {
        protected override void OnAttached()
        {
            base.OnAttached();
            AssociatedObject.AssigningCategoryStyle += AssociatedObject_AssigningCategoryStyle;
        }
 
        private void AssociatedObject_AssigningCategoryStyle(object sender, AssigningCategoryStyleEventArgs args)
        {
            SampleData currentColumn = args.GetItems(args.StartIndex, args.EndIndex)[0] as SampleData;
            args.Fill = currentColumn.ColumnBrush;
        }
    }

And attached to the ColumnSeries like this:

<i:Interaction.Behaviors>
        <local:AssigningCategoryStyleBehavior />
 </i:Interaction.Behaviors>

Attached you will find the modified sample for your reference. If you require any further assistance on the matter, please let me know.

Sincerely,

Bozhidara Pachilova

Associate Software Developer

8750.XDCColumnSeriesBehavior.zip