WPF

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Hello,
I have a RichTextBox in which there is a FlowDocument

I create a table by code

the table is displayed correctly
I save it in RTF.
I lose the formatting
only the Background is good

Thank you for your reply

a piece of code

private void button2_Click_1(object sender, RoutedEventArgs e)
        {
          
             Table T = new Table();
            
            myFlowDoc.Blocks.Add(T);
            T.CellSpacing = 1;
        
          
            for (int x = 0;x<5;x++) { T.Columns.Add(new TableColumn()); }
            T.Columns[0].Background = Brushes.Beige;
            T.Columns[0].Width = new GridLength(200);
            T.Columns[1].Width = new GridLength(150);
            T.Columns[2].Width = new GridLength(60);
            T.Columns[3].Width = new GridLength(100);
            T.Columns[4].Width = new GridLength(100);


            T.BorderThickness = new Thickness(1);
            T.BorderBrush = Brushes.Red;
           

            T.RowGroups.Add(new TableRowGroup());
            T.RowGroups[0].Rows.Add(new TableRow());  // ajout titre

            TableRow currentRow = T.RowGroups[0].Rows[0];
            currentRow.FontWeight = FontWeights.Bold;

            currentRow.Background = Brushes.Silver;    /// ok
            
            currentRow.FontSize = 20;
 

            TableCell TC = new TableCell();
           
            currentRow.Cells.Add(TC);
            TC.TextAlignment = TextAlignment.Center;
            myParagraph = new Paragraph(new Run("Résultat des mesures "));
       

            TC.Blocks.Add(myParagraph);

<pre><ListBox Grid.Row="4"
            Grid.Column="1"
            ItemsSource="{Binding RuleActionsList}"
            SelectionMode="Multiple"
            Margin="5"
            Style="{StaticResource ListBoxStyle}">

<pre>
<i:Interaction.Behaviors>
    <cls:MultiSelectionBehavior SelectedItems="{Binding SelectedRuleActions}" />
</i:Interaction.Behaviors>

<ListBox.ItemTemplate>
    <DataTemplate>
        <TextBlock Text="{Binding Converter={StaticResource enumDescConv}}"
                    Margin="2"/>
    </DataTemplate>
</ListBox.ItemTemplate>

private void ValidateProperty(string propertyName)
{
    if (RuleGroup.Errors.TryGetValue(propertyName, out List<string> errors))
    {
        errors.Clear();
    }
    else
    {
        errors = new List<string>();
    }

    switch (propertyName)
    {
        case "GroupName":
            if (RuleGroup.GroupName == null)
            {
                errors.Add("The Group Name cannot be empty");
            }
            break;

    }

    RuleGroup.Errors[propertyName] = errors;
    if (errors.Count > 0)
    {
        RuleGroup.RaiseErrorsChanged(propertyName);
    }
}

private void RuleGroup_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
    ValidateAll();
}

public class ContactViewDataTemplateSelector : DataTemplateSelector
{
    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
        FrameworkElement element = container as FrameworkElement;

        ContactsView view = container as ContactsView;    //< View is Null at this point

        switch (view.ViewMode)
        {
            case ContactsView.ViewModes.Card:
                return element.FindResource("cardViewTemplate") as DataTemplate;
                break;

            case ContactsView.ViewModes.List:
                return element.FindResource("listViewTemplate") as DataTemplate;
                break;
        }

        return null;
    }
}

<cls:ContactViewDataTemplateSelector x:Key="contactViewDataTemplateSelector" />

<DataTemplate x:Key="listViewTemplate">
    <TextBlock Text="{Binding DisplayName}"
                FontSize="18"/>
</DataTemplate>

<DataTemplate x:Key="cardViewTemplate">

<pre>
<Border Padding="2"
        Margin="2"
        BorderBrush="SteelBlue"
        BorderThickness="1"
        CornerRadius="5">

    <Grid>

        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>

        <TextBlock Text="{Binding FullName}"
                    FontWeight="Bold"
                    Foreground="Black"
                    FontSize="18"/>

        <TextBlock Text="{Binding Title}"
                    Foreground="Black"
                    FontSize="18"/>

        <TextBlock Text="{Binding Company}"
                    Foreground="Black"
                    FontSize="18"/>

    </Grid>

</Border>

<ListBox Grid.Row="0" 
            Grid.Column="0"
            ItemsSource="{Binding Contacts, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
            SelectedItem="{Binding SelectedContact, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
            ItemTemplateSelector="{StaticResource contactViewDataTemplateSelector}"
            MinWidth="175"
            Margin="2"/>

<Label Grid.Row="0" Content="Files to be copied..." Background="{x:Null}" Foreground="White" HorizontalAlignment="Center"/>
        <ListBox Grid.Row="1"
                 x:Name="dropList"
                 Margin="10"
                 SelectionMode="Extended"
                 AllowDrop="True" 
                 Drop="DropList_Drop" 
                 Foreground="White"
                 Background="#FF333337"
                 Height="Auto"
                 Width="Auto"
                 VerticalAlignment="Stretch"
                 MouseMove="DropList_MouseMove"
                 PreviewDragLeave="DropList_PreviewDragLeave" >            
            <ListBox.ContextMenu>
                <ContextMenu>
                    <MenuItem x:Name="Options"
                              Header="Options..."
                              Click="Options_Click"
                              Foreground="Black"/>
                </ContextMenu>
            </ListBox.ContextMenu>
        </ListBox>  

private void DropList_Drop(object sender, DragEventArgs e)
        {            
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
                foreach (string data in files)
                {
                    if (!dropList.Items.Contains(data))
                        dropList.Items.Add(data);
                }
            }
            else
            {
                object data = e.Data.GetData(typeof(string));
                dragSource.Items.Remove(data);
                dropList.Items.Add(data);
            }
        }

        private void DropList_MouseMove(object sender, MouseEventArgs e)
        {
            // Get the current mouse position
            Point mousePos = e.GetPosition(null);
            Vector diff = startPoint - mousePos;

            if (e.LeftButton == MouseButtonState.Pressed &&
                (Math.Abs(diff.X) > SystemParameters.MinimumHorizontalDragDistance ||
                Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance))
            {
                dragSource = dropList;
                object data = GetDataFromListBox(dragSource, e.GetPosition(dropList));

                if (data != null)
                {
                    DragDrop.DoDragDrop(dropList, data, DragDropEffects.Move);
                }
            }
        }

        private void DropList_PreviewDragLeave(object sender, DragEventArgs e)
        {
            if (Mouse.LeftButton == MouseButtonState.Released)
            {
                dragSource = dropList;
                object data = GetDataFromListBox(dragSource, e.GetPosition(dropList));

                if (data != null && dropList.Items.Contains(data))
                    dropList.Items.Remove(data);
            }            
        }