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Syncfusion Feedback

How to identify a password protected excel document and provide the password dynamically?

Platform: WinForms |
Control: XlsIO

If an excel document is encrypted with a password, XlsIO supports to raise an event to provide the password dynamically. The code snippets to provide password dynamically is given below.


 private void btnCreate_Click(object sender, System.EventArgs e)
     ExcelEngine excelEngine = new ExcelEngine();
                IApplication application = excelEngine.Excel;
                application.OnPasswordRequired += application_OnPasswordRequired;
               IWorkbook workbook;
                string inputPath = GetFullTemplatePath("Sample.xlsx");
                workbook = application.Workbooks.Open(inputPath, ExcelOpenType.Automatic);                     
                IWorksheet sheet = workbook.Worksheets[0];
                workbook.Version = ExcelVersion.Excel2010;
                string fileName = @"../../Output/Output.xlsx";
         void application_OnPasswordRequired(object sender, PasswordRequiredEventArgs e)
                e.NewPassword = "syncfusion";


            Dim excelEngine As ExcelEngine = New ExcelEngine()
            Dim application As IApplication = excelEngine.Excel
            application.OnPasswordRequired += application_OnPasswordRequired
            Dim workbook As IWorkbook
            Dim inputPath As String = GetFullTemplatePath("Sample.xlsx")
            workbook = application.Workbooks.Open(inputPath, ExcelOpenType.Automatic)
            Dim sheet As IWorksheet = workbook.Worksheets(0)
            workbook.Version = ExcelVersion.Excel2010
            Dim fileName As String = "../../Output/Output.xlsx"
        Private Sub application_OnPasswordRequired(ByVal sender As Object, ByVal e As PasswordRequiredEventArgs)
            e.NewPassword = "syncfusion"
        End Sub 


The sample illustrating the behavior can be downloaded here.




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Colin Hill
Nov 19, 2016
I have tried this example in my WPF project (with some small adaptations) and it does not work.

It throws {"Strong encryption algorithms are not supported."} exception and does not raise the event.

I am using version

Any advice you can give would be much appreciated.

Thank you

Patricio Venegas B
Sep 22, 2021

So.. no solution after 5 years?

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