Open and Save PDF document in WinUI

19 Jul 20234 minutes to read

The Syncfusion WinUI PDF Library is used to create, read, and edit Word documents programmatically without the dependency on Adobe Acrobat. Using this library, you can open and save a PDF document in WinUI.

To use the WinUI 3 project templates, install the Windows App SDK extension for Visual Studio. For more details, refer here.

Steps to open and save PDF document programmatically in WinUI Desktop app

Step 1: Create a new C# WinUI Desktop app. Select Blank App, Packaged with WAP (WinUI 3 in Desktop) from the template and click the Next button.

WinUI App

Step 2: Enter the project name and click Create.

WinUI Create

Step 3: Set the Target version to Windows 10, version 2004 (build 19041) and the Minimum version to Windows 10, version 1809 (build 17763) and then click OK.

Step 4: Install the Syncfusion.Pdf.Net NuGet package as a reference to your project from the

WinUI NuGet package


Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, you also have to add “Syncfusion.Licensing” assembly reference and include a license key in your projects. Please refer to this link to know about registering a Syncfusion license key in your application to use our components.

Step 5: Add a new button to the MainWindow.xaml as shown below.


    <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
        <Button x:Name="button" Click="myButton_Click">Create PDF</Button>

Step 6: Include the following namespaces in the MainWindow.xaml.cs file.

using Syncfusion.Pdf;
using Syncfusion.Pdf.Graphics;
using Syncfusion.Pdf.Grid;
using Syncfusion.Drawing;
using System.Reflection;
using System.Xml.Linq;

Step 7: Add a new action method OpenAndSaveDocument in the MainWindow.xaml.cs and include the below code sample to open an existing PDF document in the WinUI Desktop app.

private void OnButtonClicked(object sender, RoutedEventArgs e)
    //Open an existing PDF document.
    Assembly assembly = typeof(MainWindow).GetTypeInfo().Assembly;
    string basePath = "Load_and_Save_PDF_WinUI_Desktop.Assets.";
    Stream inputStream = assembly.GetManifestResourceStream(basePath + "Input.pdf");
    PdfLoadedDocument document = new PdfLoadedDocument(inputStream);

Step 8: Add the following code example to add paragraph and table to the PDF document.

//Get the first page from a document.
PdfLoadedPage page = document.Pages[0] as PdfLoadedPage;
//Create PDF graphics for the page.
PdfGraphics graphics = page.Graphics;
//Create a PdfGrid.
PdfGrid pdfGrid = new PdfGrid();

//Add values to the list.
List<object> data = new List<object>();
Object row1 = new { Product_ID = "1001", Product_Name = "Bicycle", Price = "10,000" };
Object row2 = new { Product_ID = "1002", Product_Name = "Head Light", Price = "3,000" };
Object row3 = new { Product_ID = "1003", Product_Name = "Break wire", Price = "1,500" };

//Add list to IEnumerable.
IEnumerable<object> dataTable = data;
//Assign data source.
pdfGrid.DataSource = dataTable;
//Apply built-in table style.
//Draw the grid to the page of PDF document.
pdfGrid.Draw(graphics, new RectangleF(40, 400, page.Size.Width - 80, 0));

Step 9: Add below code example to save the PDF document in the WinUI Desktop app.

//Give file path
filePath = "D://Result.pdf"; 
//Create a FileStream to save the PDF document.
using (FileStream outputStream = new FileStream(filePath, FileMode.Create, FileAccess.ReadWrite))
//Save the PDF file.

A complete working sample can be downloaded from Github.

By executing the program, you will get the PDF document as follows.
WinUI output PDF document

Click here to explore the rich set of Syncfusion PDF library features.