Workbook.EncryptedFilePasswordRequest Event

Raises when the WorkbookImportOptions.Password property is not set or contains a wrong password.

You need a license for the DevExpress Office File API Subscription or DevExpress Universal Subscription to use this event in production code.

Namespace: DevExpress.Spreadsheet

Assembly: DevExpress.Docs.v24.1.dll

NuGet Package: DevExpress.Document.Processor

Declaration

C#

public event EncryptedFilePasswordRequestEventHandler EncryptedFilePasswordRequest

VB.NET

Public Event EncryptedFilePasswordRequest As EncryptedFilePasswordRequestEventHandler

Event Data

The EncryptedFilePasswordRequest event's data class is EncryptedFilePasswordRequestEventArgs. The following properties provide information specific to this event:

Property	Description
Cancel	Gets or sets a value indicating whether the event should be canceled. Inherited from CancelEventArgs.
DocumentName	Gets the name of the encrypted document.
Password	Gets or sets the password used to encrypt the document.

Remarks

The EncryptedFilePasswordRequest event allows to specify a password in code using the EncryptedFilePasswordRequestEventArgs.Password property.

The code sample below shows how to handle the Workbook.EncryptedFilePasswordRequest and Workbook.EncryptedFilePasswordCheckFailed events to prompt users to enter a password. If the user cancels the operation, the Spreadsheet Document API shows an exception message and cancels loading the file.

View Example

C#

static bool IsValid { get; set; }

static void Main(string[] args)
{
    Workbook workbook = new Workbook();

    workbook.EncryptedFilePasswordRequest += Workbook_EncryptedFilePasswordRequest;
    workbook.EncryptedFilePasswordCheckFailed += Workbook_EncryptedFilePasswordCheckFailed;
    workbook.InvalidFormatException += Workbook_InvalidFormatException;

    workbook.LoadDocument("Documents\\encrypted.xlsx");
}

private static void Workbook_EncryptedFilePasswordRequest(object sender, EncryptedFilePasswordRequestEventArgs e)
{
    //Prompt the user to enter the password
    Console.WriteLine("Enter password:");
    e.Password = Console.ReadLine();
    e.Handled = true;
    IsValid = true;
}

private static void Workbook_EncryptedFilePasswordCheckFailed(object sender, EncryptedFilePasswordCheckFailedEventArgs e)
{
    //Analyze the password error:
    switch (e.Error)
    {

        //If the password is empty, raise the request again
        case SpreadsheetDecryptionError.PasswordRequired:
            Console.WriteLine("You did not enter the password!");
            e.TryAgain = true;
            e.Handled = true;
            break;

        //If the password is invalid, ask user whether to continue the operation:
        case SpreadsheetDecryptionError.WrongPassword:
            Console.WriteLine("The password is incorrect. Try Again? (y/n)");
            string answer = Console.ReadLine()?.ToLower();
            if (answer == "y")
            {
                e.TryAgain = true;
                e.Handled = true;
            }

            //If user cancels the operation, show an exception message:
            else
            {
                IsValid = false;
            }
            break;
    }

    Program.IsValid = false;
}

    private static void Workbook_InvalidFormatException(object sender, SpreadsheetInvalidFormatExceptionEventArgs e)
{
    Console.WriteLine(e.Exception.Message.ToString() + " Press any key to close...");
    Console.ReadKey(true);
}

VB.NET

Private Shared Property IsValid As Boolean

Shared Sub Main(ByVal args() As String)
    Dim workbook As New Workbook()

    AddHandler workbook.EncryptedFilePasswordRequest, AddressOf Workbook_EncryptedFilePasswordRequest
    AddHandler workbook.EncryptedFilePasswordCheckFailed, AddressOf Workbook_EncryptedFilePasswordCheckFailed
    AddHandler workbook.InvalidFormatException, AddressOf Workbook_InvalidFormatException

    workbook.LoadDocument("Documents\encrypted.xlsx")
End Sub


Private Shared Sub Workbook_EncryptedFilePasswordRequest(ByVal sender As Object, ByVal e As EncryptedFilePasswordRequestEventArgs)
    'Prompt the user to enter the password
    Console.WriteLine("Enter password:")
    e.Password = Console.ReadLine()
    e.Handled = True
    IsValid = True
End Sub

Private Shared Sub Workbook_EncryptedFilePasswordCheckFailed(ByVal sender As Object, ByVal e As EncryptedFilePasswordCheckFailedEventArgs)
    Select Case e.Error

        'If the password is empty, raise the request again
        Case SpreadsheetDecryptionError.PasswordRequired
            Console.WriteLine("You did not enter the password!")
            e.TryAgain = True
            e.Handled = True

        'If the password is invalid, ask user whether to continue the operation:
        Case SpreadsheetDecryptionError.WrongPassword
            Console.WriteLine("The password is incorrect. Try Again? (y/n)")
            Dim answer As String = Console.ReadLine()?.ToLower()
            If answer = "y" Then
                e.TryAgain = True
                e.Handled = True

            'If user cancels the operation, show an exception message:
            Else
                IsValid = False
            End If
    End Select

    Program.IsValid = False
End Sub

Private Shared Sub Workbook_InvalidFormatException(ByVal sender As Object, ByVal e As SpreadsheetInvalidFormatExceptionEventArgs)
    Console.WriteLine(e.Exception.Message.ToString() & " Press any key to close...")
    Console.ReadKey(True)
End Sub

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the EncryptedFilePasswordRequest event.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

VB.NET

spreadsheet-document-api-encryption/VB/EncryptionExample/Program.vb#L16

workbook.LoadDocument("Documents\encrypted.xlsx")
AddHandler workbook.EncryptedFilePasswordRequest, AddressOf Workbook_EncryptedFilePasswordRequest
AddHandler workbook.EncryptedFilePasswordCheckFailed, AddressOf Workbook_EncryptedFilePasswordCheckFailed

Implements

EncryptedFilePasswordRequest