The sample demonstrates how to get started with Spire.PDFViewer for WPF.

<Application x:Class="OpenPDF_WPF.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="MainWindow.xaml">
             
    <Application.Resources>
        
    </Application.Resources>
</Application>

using System.Windows;

namespace OpenPDF_WPF
{
    /// 
    /// Interaction logic for App.xaml
    /// 
    public partial class App : Application
    {
    }
}

Namespace OpenPDF_WPF
	''' 
	''' Interaction logic for App.xaml
	''' 
	Partial Public Class App
		Inherits Application
	End Class
End Namespace

<Window x:Class="OpenPDF_WPF.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Spire.PDFViewer for .NET - Demo – Open PDF via PdfViewerDocument Component" Height="608" Width="651" Loaded="Window_Loaded" xmlns:my="clr-namespace:Spire.PdfViewer.Wpf;assembly=Spire.PdfViewer.Wpf">
    <Grid>
      <ToolBar Height="43" HorizontalAlignment="Left" Name="toolBar1" VerticalAlignment="Top" Width="74">
        <Button Name="btnOpen" Click="btnOpen_Click">
         <Image Source="Resources/Open.png" Width="42"></Image>
        </Button>
      </ToolBar>
      <my:PdfDocumentViewer Height="515" HorizontalAlignment="Left" Margin="0,42,0,0" Name="pdfDocumentViewer1" VerticalAlignment="Top" Width="625" /d>
    </Grid>
</Window>    

using System;
using System.Windows;

using Microsoft.Win32;
namespace OpenPDF_WPF
{
    /// 
    /// Interaction logic for MainWindow.xaml
    /// 
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            this.pdfDocumentViewer1.LoadFromFile(@"..\..\Suns.pdf");
            this.pdfDocumentViewer1.ZoomTo(60);
        }

        private void btnOpen_Click(object sender, EventArgs e)
        {
            //open a pdf document
            OpenFileDialog dialog = new OpenFileDialog()
            {
                Filter = "Pdf document(*.Pdf)|*.pdf",
                Title = "Open Pdf Document",
                Multiselect = false
            };
            bool? result = dialog.ShowDialog();
            if (result.Value)
            {
                try
                {
                    //Load pdf document from file.
                    this.pdfDocumentViewer1.LoadFromFile(dialog.FileName);
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "Error!", MessageBoxButton.OK, MessageBoxImage.Error);
                }
            }
        }
    }
}

Imports Microsoft.Win32
Namespace OpenPDF_WPF
	''' 
	''' Interaction logic for MainWindow.xaml
	''' 
	Partial Public Class MainWindow
		Inherits Window
		Public Sub New()
			InitializeComponent()
		End Sub

		Private Sub Window_Loaded(ByVal sender As Object, ByVal e As RoutedEventArgs)
			Me.pdfDocumentViewer1.LoadFromFile("..\..\Suns.pdf")
			Me.pdfDocumentViewer1.ZoomTo(60)
		End Sub

		Private Sub btnOpen_Click(ByVal sender As Object, ByVal e As EventArgs)
			'open a pdf document
			Dim dialog As New OpenFileDialog() With {.Filter = "Pdf document(*.Pdf)|*.pdf", .Title = "Open Pdf Document", .Multiselect = False}
			Dim result? As Boolean = dialog.ShowDialog()
			If result.Value Then
				Try
					'Load pdf document from file.
					Me.pdfDocumentViewer1.LoadFromFile(dialog.FileName)
				Catch ex As Exception
					MessageBox.Show(ex.Message, "Error!", MessageBoxButton.OK, MessageBoxImage.Error)
				End Try
			End If
		End Sub
	End Class
End Namespace

The sample demonstrates how to export PDF pages as images by PdfDocumentViewer Component.

Download PDFViewer.pdf

using System;
using System.Drawing;
using System.IO;
using System.Windows.Forms;

using Spire.PdfViewer.Forms;

namespace Spire.PdfView.Demos.Export
{
    class Program
    {
        private static PdfDocumentViewer viewer = null;

        [STAThread]
        static void Main(string[] args)
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

            viewer = new PdfDocumentViewer();
            viewer.LoadFromFile("PDFViewer.pdf");

            //form and child components
            Form mainForm = new Form();
            mainForm.Text = "Spire.PdfView Demo - Export";
            mainForm.Size = new System.Drawing.Size(800, 600);
            mainForm.StartPosition = FormStartPosition.CenterScreen;

            TableLayoutPanel table = new TableLayoutPanel();
            table.ColumnCount = 3;
            table.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 50));
            table.ColumnStyles.Add(new ColumnStyle(SizeType.Absolute, 20));
            table.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 50));
            table.RowCount = 2;
            table.RowStyles.Add(new RowStyle(SizeType.Percent, 100));
            table.RowStyles.Add(new RowStyle(SizeType.Absolute, 30));

            table.Controls.Add(viewer, 0, 0);
            table.SetColumnSpan(viewer, 3);
            viewer.Dock = DockStyle.Fill;

            //Export current page to one image
            Button button = new Button();
            button.Text = "Export to one image";
            button.Size = new Size(180, 24);
            button.TextAlign = ContentAlignment.MiddleCenter;
            table.Controls.Add(button, 0, 1);
            button.Dock = DockStyle.Right;
            button.Click += ExportToOneImage;

            //Export current pdf document to multiple images
            button = new Button();
            button.Text = "Export to multiple images";
            button.Size = new Size(180, 24);
            button.TextAlign = ContentAlignment.MiddleCenter;
            table.Controls.Add(button, 2, 1);
            button.Dock = DockStyle.Left;
            button.Click += ExportToMultipleImages;

            mainForm.Controls.Add(table);
            table.Dock = DockStyle.Fill;

            Application.Run(mainForm);
        }

        private static void ExportToOneImage(object sender, EventArgs e)
        {
            if (viewer.PageCount > 0)
            {
                SaveFileDialog dialog = new SaveFileDialog();
                dialog.Filter = "PNG Format(*.png)|*.png";
                if (dialog.ShowDialog() == DialogResult.OK)
                {
                    int currentPage = viewer.CurrentPageNumber;
                    Bitmap image = viewer.SaveAsImage(currentPage - 1);
                    image.Save(dialog.FileName);
                }
            }
        }

        private static void ExportToMultipleImages(object sender, EventArgs e)
        {
            if (viewer.PageCount > 0)
            {
                FolderBrowserDialog dialog = new FolderBrowserDialog();
                if (dialog.ShowDialog() == DialogResult.OK)
                {
                    int currentPage = viewer.CurrentPageNumber;
                    Bitmap[] images = viewer.SaveAsImage(0, currentPage - 1);
                    for (int i = 0; i < images.Length; i++)
                    {
                        String fileName = Path.Combine(dialog.SelectedPath, String.Format("PDFViewer-{0}.png", i));
                        images[i].Save(fileName);
                    }
                }
            }
        }
    }
}

Imports System.Drawing
Imports System.IO
Imports System.Windows.Forms

Imports Spire.PdfViewer.Forms

Namespace Spire.PdfView.Demos.Export
    Friend NotInheritable Class Program
        Private Shared viewer As PdfDocumentViewer = Nothing

         _
        Shared Sub Main()
            Application.EnableVisualStyles()
            Application.SetCompatibleTextRenderingDefault(False)

            viewer = New PdfDocumentViewer()
            viewer.LoadFromFile("PDFViewer.pdf")

            'form and child components
            Dim mainForm As New Form()
            mainForm.Text = "Spire.PdfView Demo - Export"
            mainForm.Size = New System.Drawing.Size(800, 600)
            mainForm.StartPosition = FormStartPosition.CenterScreen

            Dim table As New TableLayoutPanel()
            table.ColumnCount = 3
            table.ColumnStyles.Add(New ColumnStyle(SizeType.Percent, 50))
            table.ColumnStyles.Add(New ColumnStyle(SizeType.Absolute, 20))
            table.ColumnStyles.Add(New ColumnStyle(SizeType.Percent, 50))
            table.RowCount = 2
            table.RowStyles.Add(New RowStyle(SizeType.Percent, 100))
            table.RowStyles.Add(New RowStyle(SizeType.Absolute, 30))

            table.Controls.Add(viewer, 0, 0)
            table.SetColumnSpan(viewer, 3)
            viewer.Dock = DockStyle.Fill

            'Export current page to one image
            Dim button As New Button()
            button.Text = "Export to one image"
            button.Size = New Size(180, 24)
            button.TextAlign = ContentAlignment.MiddleCenter
            table.Controls.Add(button, 0, 1)
            button.Dock = DockStyle.Right
            AddHandler button.Click, AddressOf ExportToOneImage

            'Export current pdf document to multiple images
            button = New Button()
            button.Text = "Export to multiple images"
            button.Size = New Size(180, 24)
            button.TextAlign = ContentAlignment.MiddleCenter
            table.Controls.Add(button, 2, 1)
            button.Dock = DockStyle.Left
            AddHandler button.Click, AddressOf ExportToMultipleImages

            mainForm.Controls.Add(table)
            table.Dock = DockStyle.Fill

            Application.Run(mainForm)
        End Sub

        Private Shared Sub ExportToOneImage(ByVal sender As Object, ByVal e As EventArgs)
            If viewer.PageCount > 0 Then
                Dim dialog As New SaveFileDialog()
                dialog.Filter = "PNG Format(*.png)|*.png"
                If dialog.ShowDialog() = DialogResult.OK Then
                    Dim currentPage As Integer = viewer.CurrentPageNumber
                    Dim image As Bitmap = viewer.SaveAsImage(currentPage - 1)
                    image.Save(dialog.FileName)
                End If
            End If
        End Sub

        Private Shared Sub ExportToMultipleImages(ByVal sender As Object, ByVal e As EventArgs)
            If viewer.PageCount > 0 Then
                Dim dialog As New FolderBrowserDialog()
                If dialog.ShowDialog() = DialogResult.OK Then
                    Dim currentPage As Integer = viewer.CurrentPageNumber
                    Dim images As Bitmap() = viewer.SaveAsImage(0, currentPage - 1)
                    For i As Integer = 0 To images.Length - 1
                        Dim fileName As [String] = Path.Combine(dialog.SelectedPath, [String].Format("PDFViewer-{0}.png", i))
                        images(i).Save(fileName)
                    Next
                End If
            End If
        End Sub
    End Class
End Namespace