How to change a single datagrid row FontWeights to Bold?

Question

When a row is selected in my datagrid and a button is pressed, I want to change the FontWeight of the cells in that row to bold.

I've been looking for a way to do it, but all I can do is change the style of every columns, I can't find a way to get the selected row (or any rows for that matter).

There are no specific values that I can bind to from the ItemSource type, so a solution using XAML and a ValueConverter is unwanted due to the increased complexity. That is, unless it's the only way.

This is how I'm proceeding:

 <DataGrid Name="dgSessions" Width="200" Height="100" 
                          CanUserAddRows="False" CanUserDeleteRows="False" 
                          HeadersVisibility="None" GridLinesVisibility="None" AutoGenerateColumns="False"
                          SelectionMode="Single" Background="White">
                    <DataGrid.Columns>
                        <DataGridTextColumn Width="*" Binding="{Binding Path=Name}"></DataGridTextColumn>
                    </DataGrid.Columns>
                    <DataGrid.CellStyle>
                        <Style TargetType="{x:Type DataGridCell}">
                            <Style.Setters>
                                <Setter Property="FontWeight"
                                        Value="Normal"/>
                            </Style.Setters>
                        </Style>
                    </DataGrid.CellStyle>
  </DataGrid>


        private void btnConnect_Click(object sender, RoutedEventArgs e)
    {
        Style oldStyle = dgSessions.SelectedCells.First().Column.CellStyle;
        Setter setter = null;
        foreach (Setter item in oldStyle.Setters)
        {
            if (item.Property.Name == "FontWeight")
            {
                setter = new Setter(item.Property, FontWeights.Bold, item.TargetName);
                break;
            }
        }
        Style newStyle = new Style(oldStyle.TargetType);
        newStyle.Setters.Add(setter);
        dgSessions.SelectedCells.First().Column.CellStyle = newStyle;


    }

Answer 1

Turns out, you can get a row of a datagrid like that:

DataGridRow row = (DataGridRow)myDataGrid.ItemContainerGenerator.ContainerFromIndex(myIndex);

There is also a different method to get a row from an Item.

So I did the following to set the row I want in bold:

1. Retrieve the index with int index = myObservableCollection.IndexOf(myObject) I don't think the index is always valid if you have a lot of rows and virtualization is enabled, but given my context, it's fine.

2. Create my Setter

   Setter bold = new Setter(TextBlock.FontWeightProperty, FontWeights.Bold, null);
   

3. Get my row:

   DataGridRow row = (DataGridRow)dgSessions.ItemContainerGenerator.ContainerFromIndex(index);
   

4. Create Style and set it:

       Style newStyle = new Style(row.GetType());
   
       newStyle.Setters.Add(bold);
       row.Style = newStyle;