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In my Program Ive got and Side Panel which is always display and on the left beside the Panel is space for the Pages which I display when I press the the button on the Side Panel of the Page I want to see.

But now Ive got a button which should Print the Page which is selected.

But for some reason the program didnt print what I have written in the RichTextBox, to understand I have an Richtextbox placeholder which looks like that:

<Grid Grid.Row="1" >
    <RichTextBox x:Name="rtb0" IsHitTestVisible="True"
             TextChanged="OnDocumentChanged" BorderThickness="0"
             Background="Transparent" Panel.ZIndex="2">
        <FlowDocument x:Name="fdoc" TextAlignment="Center"/>

            <Style TargetType="RichTextBox">
                <Setter Property="FontSize" Value="60"/>
    <TextBox x:Name="tb0" Style="{StaticResource tb0}" Text="{Binding TextBox1, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"
                      TextWrapping="Wrap" Panel.ZIndex="1" TextAlignment="Center"

        <Style TargetType="Grid">
                        <Condition Binding="{Binding TextBox1}" Value=""/>
                        <Condition Binding="{Binding printcontrol}" Value="True"/>
                    <Setter Property="Visibility" Value="Hidden"/>

and my Style for that:

<Style TargetType="{x:Type TextBox}" x:Key="tb0">
          <Setter Property="BorderThickness" Value="0"/>
          <Setter Property="FontSize" Value="40"/>
              <DataTrigger Binding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Page}}, Path=IsDocumentEmpty0}"
                  <Setter Property="Visibility" Value="Hidden"/>



and my OnDocumentChange:
  public bool IsDocumentEmpty0
            get { return (bool)GetValue(IsDocumentEmptyProperty0); }
            set { SetValue(IsDocumentEmptyProperty0, value); }
public static readonly DependencyProperty IsDocumentEmptyProperty0 =
          DependencyProperty.Register("IsDocumentEmpty0", typeof(bool), typeof(A4Page), new PropertyMetadata(false));

 private void OnDocumentChanged(object sender, TextChangedEventArgs e)
            if (sender is RichTextBox richText)
                if (richText.Name == "rtb0")
                    int size = rtb0.Document.ContentStart.GetOffsetToPosition(rtb0.Document.ContentEnd);
                    IsDocumentEmpty0 = (size == 0 // The document has not blocks. Example, after Ctrl+A & Delete. 
                            || size == 2 // The document has 1 block without inlines. For example, 1 paragraph without inline(s).  
                            || size == 4); // The document has 1 block and 1 paragraph with empty inline. 

Thats all for that I have an Placholder for an RichTextBox. Now when I print I want to hide all Placeholder that not be used. And thats working ( for that I have the printcontrol Property) but now when I want to print I always get the Page with the placeholder text and not with the text I wrote.

What I have tried:

For that I tried this on my MainWindow:
var vm = (ViewModel)this.DataContext;
           A4Page page = new A4Page();

And that On my Page the Print Method:

var vm = (ViewModel)this.DataContext;
            vm.printcontrol = true;
            PrintDialog printDlg = new PrintDialog();
            int i = 0;
            LocalPrintServer printServer = new LocalPrintServer();

            PrintQueueCollection printQueuesOnLocalServer = printServer.GetPrintQueues(new[] { EnumeratedPrintQueueTypes.Local, EnumeratedPrintQueueTypes.Connections });

            foreach (PrintQueue printer in printQueuesOnLocalServer)

                printDlg.PrintQueue = new PrintQueue(new PrintServer(), printer.Name);
                //if (printer.Name == "Kyocera ECOSYS P3045dn (2)")
                if(i == 3)
            // printDlg.PrintQueue = new PrintQueue(new PrintServer(),vm.selected_printer);
            printDlg.PrintTicket.CopyCount = vm.PrintCount;


            printDlg.PrintTicket.PageMediaSize = new PageMediaSize(PageMediaSizeName.ISOA4); ///Setzt die Richtige Größe
            printDlg.PrintTicket.PageOrientation = PageOrientation.Portrait;///Setzt das Document auf Vertical Drucken

            printDlg.PrintVisual(PageA4, "Page Printing.");
            vm.printcontrol = false;

But For Some reason its always empty the Richtextbox when I press the print button on my Sidepanel.

I tried to get the text manuel from my RichTextBox with that:

string richText = new TextRange(rtb0.Document.ContentStart, rtb0.Document.ContentEnd).Text;

but for some reason Its always empty
Updated 5-Aug-22 5:38am

1 solution

Your "TextBox" is sitting in the same "cell" as the "RichTextBox"; you let them both default to the same row and column. The TextBox will cover the RichTextBox (when it has content and / or is stretched).

If that's the plan, you need to hide the TextBox when you want to show what's underneath.
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