PdfDocumentSource allows you to load a PDF in FlexViewer control using two methods, LoadFromFileAsync and LoadFromStreamAsync, of C1PdfDocumentSource class. The LoadFromFileAsync method loads PDF from the source file and the LoadFromStreamAsync method loads a PDf from source stream.

To load PDF from file

The following code uses the LoadFromFileAsync method to load a PDF from source file.

Dim fileName As String = Nothing

sf = Await StorageFile.GetFileFromApplicationUriAsync(New Uri _
     ("ms-appx:///DefaultDocument.pdf"))
Await pds.LoadFromFileAsync(sf)
fileName = Path.GetFileName(sf.Name)

string fileName = null;

sf = await StorageFile.GetFileFromApplicationUriAsync(
     new Uri("ms-appx:///DefaultDocument.pdf"));
await pds.LoadFromFileAsync(sf);
fileName = Path.GetFileName(sf.Name);

To load PDF from stream

1. Use the following code to load a PDF from source stream using LoadFromStreamAsync method.
   • Visual Basic
   • C#

   • Visual Basic

   Private asm As Assembly = GetType(MainPage).GetTypeInfo().Assembly
   Private Function LoadPdf(pdfName As String) As Task
       Dim pdfSource As New C1PdfDocumentSource()
       pdfSource.UseSystemRendering = False
       If pdfSource Is Nothing Then
          pdfSource = New C1PdfDocumentSource()
       End If
       ' load pdf from resource stream
       Dim memStream = New MemoryStream()
       Using stream As Stream = asm.GetManifestResourceStream(Convert.ToString("Sample_PDFDocumentSource.Resources.") & pdfName)
          Await stream.CopyToAsync(memStream)
          memStream.Position = 0
       End Using
       Await pdfSource.LoadFromStreamAsync(memStream.AsRandomAccessStream())
       flexViewer.DocumentSource = pdfSource
   End Function
   

   • C#

   Assembly asm = typeof(MainPage).GetTypeInfo().Assembly;
   async Task LoadPdf(string pdfName)
   {
       C1PdfDocumentSource pdfSource = new C1PdfDocumentSource();
       pdfSource.UseSystemRendering = false;
       if (pdfSource == null)
       {
           pdfSource = new C1PdfDocumentSource();
       }
       // load pdf from resource stream
       var memStream = new MemoryStream();
       using (Stream stream = asm.GetManifestResourceStream
             ("Sample_PDFDocumentSource.Resources." + pdfName))
       {
           await stream.CopyToAsync(memStream);
           memStream.Position = 0;
       }
       await pdfSource.LoadFromStreamAsync(memStream.AsRandomAccessStream());
       flexViewer.DocumentSource = pdfSource;
   }
   

2. Add the following code beneath the InitializeComponent() method to call the LoadPdf method.
   • Visual Basic
   • C#

   • Visual Basic

   LoadPdf("DefaultDocument.pdf")
   

   • C#

   LoadPdf("DefaultDocument.pdf");