Save PDF Files in Your Mobile and Desktop Apps.

Updated over 6 months ago

Environment

Version	Product	Author
11.0.0	Telerik UI for .NET MAUI PDF Viewer	Dobrinka Yordanova

Description

Learn how to save PDF files in your .NET MAUI application.

This knowledge base article also answers the following questions:

• How can I save PDF files?
• How can I use the PDF Viewer Toolbar for Saving PDF documents?

Solution

For saving files, use the .NET MAUI File System Helper API. The Save command will be executed from a custom toolbar ButtonToolbarItem inside the PDF Viewer Toolbar.

1. Define the PDF VIewer and PDF Viewer Toolbar:

XAML

<Grid>
	<Grid.RowDefinitions>
		<RowDefinition Height="Auto"/>
		<RowDefinition />
	</Grid.RowDefinitions>
		<telerik:RadPdfViewerToolbar PdfViewer="{Binding Source={x:Reference pdfViewer}}">
			<telerik:ButtonToolbarItem Text="Share" Command="{Binding SaveDocumentCommand}" />
	</telerik:RadPdfViewerToolbar>
	<telerik:RadPdfViewer x:Name="pdfViewer" 
						  Grid.Row="1"
                          Document="{Binding Document, Mode=OneWayToSource}" />
</Grid>

2. In this example, the document is loaded as Embedded Resource.

C#

Func<CancellationToken, Task<Stream>> streamFunc = ct => Task.Run(() =>
{
	Assembly assembly = typeof(MainPage).Assembly;
	string fileName = assembly.GetManifestResourceNames().FirstOrDefault(n => n.Contains("pdf-overview.pdf"));
	Stream stream = assembly.GetManifestResourceStream(fileName);
	return stream;
});
this.pdfViewer.Source = streamFunc;

3. Create a ViewModel and implement the ShareDocumentCommand which defines the Share API:

C#

public class ViewModel
{
	public ViewModel()
	{
		this.SaveDocumentCommand = new Command(this.SaveDocument);
	}

	// save pdf document
	private void SaveDocument(object obj)
	{

		var fileName = "document.pdf";
		var localFolder = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
		var filePath = Path.Combine(localFolder, fileName);

		using (Stream output = File.OpenWrite(filePath))
		{
			new Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider().Export(this.Document, output);

			Application.Current.MainPage.DisplayAlert("Document is saved to local application data: ", filePath, "OK");
		}
	}

	public RadFixedDocument Document { get; set; }

	public ICommand SaveDocumentCommand { get; set; }
}

Make sure the app is granted permissions to access local data.

See Also

• PDF Viewer Toolbar