How do I programmatically create a PdfView?

To programmatically create a PdfView:

Initialize the SDK.
Create a PdfView object in the OnNavigatedTo handler of the Page.
Add a handler for PdfView.InitializationCompletedHandler.
Add the PdfView to the children of a UI element on the Page.

Once initialization is complete, you can display a PDF:

namespace App1
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
            PSPDFKit.Sdk.Initialize("YOUR_LICENSE_GOES_HERE");
        }

        private PdfView _pdfView;

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            _pdfView = new PdfView();
            _pdfView.InitializationCompletedHandler += PdfView_InitializationCompletedHandler;
            Grid.Children.Add(_pdfView);
        }

        private async void PdfView_InitializationCompletedHandler(PdfView sender, PSPDFKit.Pdf.Document args)
        {
            var storageFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Assets/A.pdf"));
            _pdfView.PdfFileSource = storageFile;
        }
    }
}

<Page
    x:Class="App1.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:App1"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <Grid Name="Grid">

    </Grid>
</Page>