How to get the current page number or check if PDF viewer is on the Last page of a PDF in WPF Webview2 control?

Question

I am working on a WPF application where I use Webview2 to display PDF files. I rely on Edge's built in PDF rendering mechanism and am not using any external PDF libraries. I've successfully loaded the PDF using the following code:

PdfWebView.CoreWebView2.Navigate($"file:///{pdfFilePath.Replace("\", "/")}#toolbar=0");

Now I need to

1. Retrieve the current page number of the PDF being viewed.
2. Determine if the user is viewing the last page of the PDF

I haven't found any direct way to achieve this. I am aware we can execute JavaScript inside Webview2, but I don't think Edge PDF viewer exposes properties or methods (currentPageNumber, pagecount) that can help. Could someone guide me on this.

Any guidance or code examples would be greatly appreciated.

Thank you

Answer 1

the webview does not directly support pdf viewing. it loads a registered app to display PDF. the registered app reads the data out of a cache. there are no exposed methods to the webview and as its a separate app, no javascript can be run to access it.

you could use a javascript application like pdf.js to render the PDF and capture display events:

https://github.com/mozilla/pdf.js