How to Highlight Row programaticaly only

Question

This is as respond to code mentioned here which partly works for me but not as desired and unfortunately in WPF I am not able to cope with this problem and find solution. Because I was not able to find functional solution I am asking this question.

Get selected row item in DataGrid WPF

Was tried to achieve the result

Respond

answered Apr 19 '11 at 22:01 by Bahaa Salaheldin

was most useful

But what happens is that while I am scrolling down , selected line is repeatedly showing up , I think because of "ContainerFromItem" approach. Is it possible to change background of DataGrid programmatically ? - only in C# code ? What I tried was that I played a little with ... selected index and so and it is not as easy as it in WindowsForms is . So I tried to find out how to perform Highlighting . What I am using are : DataTable in DataObject that is binded DataGrid Items Soruce is dataObject.DataTable I know that I have to perform .Background = Brushes."DesiredColor" on DataGridRow But I am not sure if there is any relation between DataGrid Selected Index / Selected Item / SelectedItems and Background property Thank you.

11/06/19 More info added:

Here I am posting example code , but this code is functional for windows forms , I thought I can do something like this.

 foreach (DataGridViewRow row in dgvNetlist.Rows)
            {

                if (row.Cells[2].Value.ToString().Contains(Messages.SingleConnection))
                    row.DefaultCellStyle.BackColor = databaseColor[0];                     //error color                    
                else if (row.Cells[2].Value.ToString().Contains(Messages.MissingTP))
                    row.DefaultCellStyle.BackColor = databaseColor[1];                    
                else if (row.Cells[2].Value.ToString().Contains(Messages.MissingConnection))//if message cell contains missing connections
                    row.DefaultCellStyle.BackColor = databaseColor[2];                    
                else if (row.Cells[2].Value.ToString().Contains(Messages.MultipleTPs) && cbHideMultipleTPs.Checked == false)  //if message cell contains multiple TPs
                    row.DefaultCellStyle.BackColor = databaseColor[3];
                else if (row.Cells[2].Value.ToString().Contains(Messages.EmptyNet))      //if message cell contains Empty net
                    row.DefaultCellStyle.BackColor = databaseColor[0]; 
                else
                    row.DefaultCellStyle.BackColor = databaseColor[4];                  //OK color

                if (row.Cells[4].Value.ToString().Equals("True"))                       //if row is marked -> marked color
                    row.DefaultCellStyle.BackColor = databaseColor[5];
                i++;
            }

But with own rules , for example , user has to "save" some row, he wants to highlight the row. What I want to do is in steps:

1) Get the item ID from selected ROW ... Item ID I mean the original ID in table for instance ID number 950
2) do some highlight action , eg. background to different colour. 3) save the ID to the user settings because each user can have different rows highlighted

4) on another application start , use some cycle to find saved rows ( does not matter if there are more or less items in database ) and highlight the rows - does not matter how ordered they are - highlighting depends on item ID ...

I thought it is somehow possible while I can get ID from datagrid-> selected item

but I found no way to do it like in code posted above.

Hope this will make it more clear

Answer 1

Since you don't have any code posted its difficult to tell what exactly you want. To change the background colour use a DataTrigger bound to IsSelected and if it is true then set the background colour to your desired highlighted colour

    <Style TargetType="{x:Type ContentControl}">
        <Setter Property="Visibility" Value="Collapsed"/>
        <Style.Triggers>
            <DataTrigger Binding="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type ListBoxItem}},Path=IsSelected}" Value="True">
                <Setter Property="Background" Value="Red"/>
            </DataTrigger>
        </Style.Triggers>
    </Style>

UPDATE: If you want to do it programatically then you can create the binding in the code, where Listboxitem is the listbox containing the item and SelectedToBackgroundConverter is a converter which implements the rules you mentioned in your post.

        gridLine.SetBinding(BackgroundProperty, new Binding(nameof(IsSelected)) { Source = ListBoxItem, Converter = new SelectedToBackgroundConverter() });

Doing this in code though is much more complicated than using xaml.