Viewing Password protected PDF Files in WPF Pdf Viewer

29 Jul 20214 minutes to read

PDF Viewer allows you to view the password-protected PDF files by passing the file name and the correct password as parameters to the Load method of PdfViewerControl. Refer to the following code to perform the same.

C#

using System.Windows;

namespace PdfViewerDemo
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        # region Constructor
        public MainWindow()
        {
            InitializeComponent();

            //Load password protected PDF file using the file path and the password.
            pdfViewer.Load(@"Template.pdf", "password");
        }
        #endregion
    }
}

View password protected PDF files in run time

When opening a password protected PDF file in run time using the Open button available in the toolbar, the following built-in password dialog window helps to to view the file contents, requesting the correct password from the user. In the password textbox, enter the correct password and click OK.

Hide the built-in password dialog

PDF Viewer helps to hide the built-in password using the GetDocumentPassword and gets the password using the Password property of the GetDocumentPasswordEventArgs. The event GetDocumentPassword occurs every time when you try to open a password protected PDF file in run-time. By setting the Handled property of GetDocumentPasswordEventArgs to true, the built-in password dialog will not appear. Refer to the following code to hide the password dialog and to provide password to open the file by wiring the event.

C#

using Syncfusion.Windows.PdfViewer;
using System.Collections.Generic;
using System.Windows;

namespace PasswordPDFDemo
{    
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            pdfViewerControl. GetDocumentPassword += PdfViewer_GetDocumentPassword;
            string filePath = Path.GetFullPath(@"../../Data/syncfusion.pdf");
            pdfViewerControl.Load(filePath);
        }

     private void PdfViewer_GetDocumentPassword(object sender, GetDocumentPasswordEventArgs e)
     {
            System.Security.SecureString secureString = new System.Security.SecureString();
            secureString.AppendChar('p');
            secureString.AppendChar('a');
            secureString.AppendChar('s');
            secureString.AppendChar('s');
            secureString.AppendChar('w');
            secureString.AppendChar('o');
            secureString.AppendChar('r');
            secureString.AppendChar('d');
            e.Password = secureString;
            
            // Enabling handled to hide the password dialog.
            e.Handled = true;            
        }
    }
}

NOTE

You can refer to our WPF PDF Viewer feature tour page for its groundbreaking feature representations. You can also explore our WPF PDF Viewer example to know how to render and configure the pdfviewer.