I have been going thru the fourm for a simple solution to set the background color of a row depending on a criteria.

most of the suggestions point to a xaml datatrigger like

• <igDP:XamDataGrid.Resources>

Here are the issues I have:

• The above xaml works patially, fails for instance, I have row #1 matching the criteria and showing backcolor in orange. when I delete the row from the datasource, now row #2 movers up and is shown with the backcolor as orange (Even though #2 does not match the criteria).
• Also most of the applications want to attach dynamic code/rules and writing data trigger thru xaml seems like hardcoding, can we have c# code based solution to change the background color (and also which event we need to run the c# based code). I have below code, but it does not work in InitializeRecord as DataPresenter is null and does not work in loaded event too.

RecordCollectionBase recordsCollection = xamDataGrid1.Records;
foreach (Record rec in recordsCollection)
  {
      DataRecord dataRec = (DataRecord)rec;
      if ("Sales" == (string)dataRec.Cells["department"].Value)
          {
              DataRecordPresenter.FromRecord(rec).Background = Brushes.Orange;
          }
  }

can you please suggest a simple solution to the row background coloring with a sample code solution if possible. Thanks

Rich,

Try setting the RecordContainerGenerationMode to PreLoad. If you are using this approach, you have to change that, because the Default value is recycling and the DataRecordPresenters are reused and that is why you are seeing Background color to the incorrect record. The other way is as you have already found out, clearing the value. Please note that you can use .ClearValue(...) method instead of setting it to transparent.

Alex,

Thank you for the hint - works much better. My problem now, however, is that as I scroll down in the xamDataGrid I see rows w/red background that should not have it (don't meet the "if" below. Here is my code sample:

private void gridOrderPoolList_RecordsInViewChanged(object sender, RecordsInViewChangedEventArgs e)
{
            XamDataGrid orderDataGrid = (XamDataGrid)e.Source;
            Record[] myRecords = orderDataGrid.GetRecordsInView(false); //no children records
            foreach (DataRecord dr in myRecords)
            {
                BizSessionViewEntity row = (BizSessionViewEntity)dr.DataItem;
                if (row.MRN == "075837714") //example of identifying a given row
                    DataRecordPresenter.FromRecord(orderDataGrid.Records[dr.Index]).Background = new          SolidColorBrush(Colors.Red);
            }
}

What am I missing? I don't understand how the background of the unrelevant rows gets changed. My work-around is to have an "else" for the above "if" and change the color back to SolidColorBrush(Colors.Transparent), but I'd rather not do that. Any feedback would be greatly appreciated.

It only happens when I start scrolling in the grid.

-Rich

Rich,

This is because, the XamDataGrid uses virtualization by default. Any DataRecordPresenters that are not currently visible are not created - they are virtualized. That is why you are getting an exception. You should create a style for these DataRecordPresenter or do this only for the records that are in view. You can get them with the GetRecordsInView(...) method of the XamDataGrid. You can keep this consistent by handling this in the RecordsInViewChanged event - this will fire each time a records gets into view.

Hope this helps.

Alex,

I was trying to use the above in the following way: in a method where I specify DataSource for my grid (gridOrderPoolList) I have the following after the grid has data:

foreach

(DataRecord dr in gridOrderPoolList.Records)

{

BizSessionViewEntity row = (BizSessionViewEntity)dr.DataItem;

if (row.MRN == "046733083") //example of identifying a row by some value

DataRecordPresenter.FromRecord(gridOrderPoolList.Records[dr.Index]).Background = new SolidColorBrush(Colors.Red);

}

}

At run time I get the exception that "object reference not set to an instance of an object" and it fails on the line where I use DataRecordPresenter. Any ideas?

Thank you for your help.

-Rich