PDF: Import and export data of PDF interactive form

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The PdfInteractiveFormDataXfdfCodec class allows to export/import the field values of PDF interactive form in XFDF format.

Here is C#/VB.NET code that demonstrates how to export/import the data of PDF interactive form:

/// <summary>
/// Exports the form data to the specified stream.
/// </summary>
/// <param name="document">The PDF document.</param>
/// <param name="stream">The stream, where form data must be exported.</param>
public static void ExportFormData(
    Vintasoft.Imaging.Pdf.PdfDocument document, 
    System.IO.Stream stream)
{
    if (document.InteractiveForm != null)
    {
        Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormDataXfdfCodec xfdfCodec = 
            new Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormDataXfdfCodec();
        xfdfCodec.ExportFieldsWithoutValue = false;
        xfdfCodec.Export(document.InteractiveForm, stream);
    }
}

/// <summary>
/// Imports the form data from the specified stream.
/// </summary>
/// <param name="document">The PDF document.</param>
/// <param name="stream">The stream from which the form data must be imported.</param>
public static void ImportFormData(
    Vintasoft.Imaging.Pdf.PdfDocument document, 
    System.IO.Stream stream)
{
    if (document.InteractiveForm != null)
    {
        Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormDataXfdfCodec xfdfCodec = 
            new Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormDataXfdfCodec();
        xfdfCodec.Import(document.InteractiveForm, stream);
        document.InteractiveForm.UpdateAppearances();
    }
}

VB.NET

''' <summary>
''' Exports the form data to the specified stream.
''' </summary>
''' <param name="document">The PDF document.</param>
''' <param name="stream">The stream, where form data must be exported.</param>
Public Shared Sub ExportFormData(document As Vintasoft.Imaging.Pdf.PdfDocument, stream As System.IO.Stream)
    If document.InteractiveForm IsNot Nothing Then
        Dim xfdfCodec As New Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormDataXfdfCodec()
        xfdfCodec.ExportFieldsWithoutValue = False
        xfdfCodec.Export(document.InteractiveForm, stream)
    End If
End Sub

''' <summary>
''' Imports the form data from the specified stream.
''' </summary>
''' <param name="document">The PDF document.</param>
''' <param name="stream">The stream from which the form data must be imported.</param>
Public Shared Sub ImportFormData(document As Vintasoft.Imaging.Pdf.PdfDocument, stream As System.IO.Stream)
    If document.InteractiveForm IsNot Nothing Then
        Dim xfdfCodec As New Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormDataXfdfCodec()
        xfdfCodec.Import(document.InteractiveForm, stream)
        document.InteractiveForm.UpdateAppearances()
    End If
End Sub

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