How to: Load a PDF Document from a Uri

• Jun 20, 2018
• 2 minutes to read

This example shows how to load a document in the PDF Viewer from a Uri using the DocumentViewerControl.DocumentSource property.

Important

When you load a document, the input stream should not be closed before the control finishes using a document (PdfViewerControl.DetachStreamOnLoadComplete is set to false by default). This allows the PDF Viewer to render a large PDF quickly but makes it impossible to edit or delete the document until it is open in the PDF Viewer.

If you want to close the stream after a document is loaded into the PDF Viewer, set the PdfViewerControl.DetachStreamOnLoadComplete property to true. However, in this case the high rendering performance is not guaranteed.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-load-a-pdf-document-from-a-uri-t263203.

MainWindow.xaml

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dxpdf="http://schemas.devexpress.com/winfx/2008/xaml/pdf" 
        x:Class="LoadPDFDocument.MainWindow"
        Title="MainWindow" Height="350" Width="525">

    <Grid>
        <dxpdf:PdfViewerControl x:Name="Viewer" />
    </Grid>
</Window>

MainWindow.xaml.vb

Imports System
Imports System.Windows
Imports System.Reflection

Namespace LoadPDFDocument

    Partial Public Class MainWindow
        Inherits Window

        Public Sub New()
            InitializeComponent()

            Dim baseUri As New Uri(System.Reflection.Assembly.GetEntryAssembly().Location)
            Dim uri As New Uri(baseUri, "..\..\Demo.pdf")
            Viewer.DocumentSource = uri
        End Sub
    End Class
End Namespace

MainWindow.xaml.cs

using System;
using System.Windows;
using System.Reflection;

namespace LoadPDFDocument {

    public partial class MainWindow : Window {

        public MainWindow() {
            InitializeComponent();

            Uri baseUri = new Uri(Assembly.GetEntryAssembly().Location);
            Uri uri = new Uri(baseUri, "..\\..\\Demo.pdf");
            Viewer.DocumentSource = uri;
        }
    }
}