How do I print WebView content C# UWP Win 10

Question

I\'ve searched how to print a simple WebView as :

Answer 1

For your requment, I simplified the PrintHelper of official sample and created a simple sample to print WebView via use WebViewBrush.

<Page.BottomAppBar>
    <CommandBar>
        <AppBarButton
            x:Name="appbar_Printer"
            Click="appbar_Printer_Click"
            Label="printer" />
    </CommandBar>
</Page.BottomAppBar>

<Grid x:Name="PrintArea" Background="White">

    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="995" />
        <ColumnDefinition Width="300" />
        <ColumnDefinition  Width="50"/>

    </Grid.ColumnDefinitions>

    <WebView Grid.Column="0" x:Name="MyWebView" Source="http://www.stackoverflow.com" HorizontalAlignment="Right" />
    <Rectangle Grid.Column="1" x:Name="MyWebViewRectangle" Fill="Red" />
    <Button Grid.Column="2" Content="Print"  HorizontalAlignment="Center"/>

</Grid>

When the WebView load completed, you could add the MyWebViewRectangle that fill with WebViewBrush to printDoc.

private async void appbar_Printer_Click(object sender, RoutedEventArgs e)
{
    if (printDoc != null)
    {
        printDoc.GetPreviewPage -= OnGetPreviewPage;
        printDoc.Paginate -= PrintDic_Paginate;
        printDoc.AddPages -= PrintDic_AddPages;
    }
    this.printDoc = new PrintDocument();
    printDoc.GetPreviewPage += OnGetPreviewPage;
    printDoc.Paginate += PrintDic_Paginate;
    printDoc.AddPages += PrintDic_AddPages;
    bool showPrint = await PrintManager.ShowPrintUIAsync();
}
private void PrintDic_AddPages(object sender, AddPagesEventArgs e)
{
    Rectangle page = (Rectangle)this.FindName("MyWebViewRectangle");
    printDoc.AddPage(page);
    printDoc.AddPagesComplete();
}
private void PrintDic_Paginate(object sender, PaginateEventArgs e)
{
    PrintTaskOptions opt = task.Options;
    PrintTaskOptionDetails printDetailedOptions = PrintTaskOptionDetails.GetFromPrintTaskOptions(e.PrintTaskOptions);

    printDoc.SetPreviewPageCount(1, PreviewPageCountType.Final);
}

I have uploaded the code sample to github that you could refer to.