I am using PdfPrintingNet library to load pdf documents in my application. The end-goal is for the user to open as many pdf documents as he/she wants and my app will keep them all in a TabControl. But when I try to open any pdf document I get an error: NullRefernceException when I try to create the view that implements PDFViewer.
I also made sure that my app is referencing PdfPrintingNet. I am at a loss here.
UPDATE: SEE UPDATED POST BELOW
So today I managed to make some tweaks to my code. First off changed PDFDisplayView.xaml
from
<Grid>
<!-- winforms host with embedded PDFPrint.net viewer -->
<WindowsFormsHost x:Name="_pdfViewerHost" Background="{DynamicResource {x:Static SystemColors.ControlBrushKey}}">
<pdfview:PdfViewer IsCalledFromWPF="True" />
</WindowsFormsHost>
</Grid>
to
<Grid>
<!-- winforms host with embedded PDFPrint.net viewer -->
<WindowsFormsHost x:Name="_pdfViewerHost" Background="{DynamicResource {x:Static SystemColors.ControlBrushKey}}">
</WindowsFormsHost>
</Grid>
I removed the pdfView from it because I think the issue is that its being called before being initialized.
What Im doing now is that in my OpenPdfDocument method I am creating an instance of PdfViewer and then making it a child of _pdfViewerHost.
/// <summary>
/// Open PDF document.
/// </summary>
void OpenPdfDocument()
{
//var pdfViewer = _pdfViewerHost.Child as PdfViewer;
PdfViewer pdfViewer = new PdfViewer();
if (pdfViewer != null)
{
try
{
_pdfViewerHost.Child = pdfViewer;
/**********************Breaks Here*******************************************/
PdfOpenFileStatus status = pdfViewer.OpenDocument(_fileNameAndPath);
/****************************************************************************/
if (status.Result != PdfOpenFileStatus.PdfOpenFileResult.OK)
{
MessageWindow.Show("There was a problem opening the PDF document." + Environment.NewLine +
"Status: " + status.Status.ToString(), "Error", "OK", string.Empty);
}
else
{
// set pdf viewer license
pdfViewer.SetLicenseInfo("MyCompanyLicense", "MyLicenseKey");
// set up viewer
pdfViewer.ShowBookmarks = true;
pdfViewer.ToolbarOpenVisible = false;
pdfViewer.ToolbarEmailVisible = false;
pdfViewer.ToolbarPrintVisible = false;
pdfViewer.ToolbarSaveVisible = false;
pdfViewer.ToolbarDocumentInfoVisible = false;
pdfViewer.BackColor = System.Drawing.SystemColors.Control;
pdfViewer.BorderColor = System.Drawing.Color.FromArgb(203, 203, 203);
// link clicked and text not found callbacks
pdfViewer.LinkClicked += PdfViewer_LinkClicked;
pdfViewer.NotFoundText += PdfViewer_NotFoundText;
// set up view screen parameters
UpdatePdfViewerLocationAndSize();
}
}
catch (Exception ex)
{
}
}
}
The funny thing is that after I click CONTINUE in Visual Studio my application runs and I am able to see the PDFViewer application with my selected pdf document loaded. And I have full use of the PDFViewer controls.
Can someone help me understand why I am getting this error? Is there some extra step?
