UWP C# xaml image printing glitch

Question

Greeting MSDN,

I am facing a problem of not showing image to print for the first time:
I am using Print Sample from GitHub - I don't know how can I fix a glitch of not printing an image for the first time - I have to click print button few times to show it up... other images do show.

Answer 1

Hi,

Welcome to Microsoft Q&A!

Maybe your image isn’t initialized or load completely when the preview window displays. Please refer to the following steps to resolve this issue.

1.Provide a Canvas control and make it completely transparent(Opacity="0"), so that it doesn’t interfere with your UI.

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">  
        <Canvas Name="MyCanvas" Opacity="0"/>  
        <Button x:Name="btnPrint" Click="btnPrint_Click" Content="Print" HorizontalAlignment="Center" Margin="0,0,0,0" VerticalAlignment="Center"/>  
</Grid>  

2.Add a PreparePrintContent method and call it before the PrintManager.ShowPrintUIAsync in the btnPrint_Click event, as follows:

private async void btnPrint_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;  

    PreparePrintContent(new PageToPrint());  

    bool showPrint = await PrintManager.ShowPrintUIAsync();  
}  

private void PreparePrintContent(Page pageToPrint)  
{  
    var canvas=(Canvas)this.FindName("MyCanvas");  
    canvas.Children.Clear();  
    canvas.Children.Add(pageToPrint);  
}  

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