PDF: Change field value in PDF interactive form

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To change a value of a form field is necessary to do the following:

Find the field which value is necessary to change
Change PdfInteractiveFormSwitchableButtonField.Value property of PdfInteractiveFormCheckBoxField class
Change PdfInteractiveFormSwitchableButtonGroupField.CheckedAppearanceStateName property of PdfInteractiveFormRadioButtonGroupField class
Change PdfInteractiveFormChoiceField.SelectedItem property of PdfInteractiveFormComboBoxField class
Change PdfInteractiveFormChoiceField.SelectedItem property or PdfInteractiveFormListBoxField.SelectedItems property of PdfInteractiveFormListBoxField class
Change PdfInteractiveFormTextField.Value property of PdfInteractiveFormTextField class
Change PdfInteractiveFormBarcodeField.DefaultValue property of PdfInteractiveFormBarcodeField class
Change PdfInteractiveFormSignatureField.SignatureInfo property of PdfInteractiveFormSignatureField class

To change the default value of a form field is necessary to do the following:

Find the field which value is necessary to change
Change PdfInteractiveFormSwitchableButtonField.DefaultValue property of PdfInteractiveFormCheckBoxField class
Change PdfInteractiveFormSwitchableButtonGroupField.DefaultCheckedAppearanceStateName property of PdfInteractiveFormRadioButtonGroupField class
Change PdfInteractiveFormChoiceField.DefaultSelectedItem property of PdfInteractiveFormComboBoxField class
Change PdfInteractiveFormChoiceField.DefaultSelectedItem property of PdfInteractiveFormListBoxField.DefaultSelectedItems property of PdfInteractiveFormListBoxField class
Change PdfInteractiveFormTextField.DefaultValue property of PdfInteractiveFormTextField class
Change PdfInteractiveFormBarcodeField.DefaultValue property of PdfInteractiveFormBarcodeField class

Here is C#/VB.NET code that demonstrates how to change the value of a text field:

/// <summary>
/// Changes the text field value.
/// </summary>
/// <param name="document">The PDF document.</param>
/// <param name="fieldFullName">Full name of the field.</param>
/// <param name="newValue">The new value of the field.</param>
/// <returns>
/// <b>true</b> - field value is changed successfully;
/// <b>false</b> - field value is NOT changed.
/// </returns>
public static bool ChangeTextFieldValue(
    Vintasoft.Imaging.Pdf.PdfDocument document,
    string fieldFullName,
    string newValue)
{
    // if PDF document has PDF interactive form
    if (document.InteractiveForm != null)
    {
        // find field by name
        Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormField field =
            document.InteractiveForm.FindField(fieldFullName);
        // if field is found
        if (field != null)
        {
            Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormTextField textField =
                field as Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormTextField;
            // if field is text field
            if (textField != null)
            {
                // set new value of the field
                textField.Value =
                    new Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormTextFieldStringValue(document, newValue);

                return true;
            }
        }
    }
    return false;
}

VB.NET

''' <summary>
''' Changes the text field value.
''' </summary>
''' <param name="document">The PDF document.</param>
''' <param name="fieldFullName">Full name of the field.</param>
''' <param name="newValue">The new value of the field.</param>
''' <returns>
''' <b>true</b> - field value is changed successfully;
''' <b>false</b> - field value is NOT changed.
''' </returns>
Public Shared Function ChangeTextFieldValue(document As Vintasoft.Imaging.Pdf.PdfDocument, fieldFullName As String, newValue As String) As Boolean
    ' if PDF document has PDF interactive form
    If document.InteractiveForm IsNot Nothing Then
        ' find field by name
        Dim field As Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormField = document.InteractiveForm.FindField(fieldFullName)
        ' if field is found
        If field IsNot Nothing Then
            Dim textField As Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormTextField = TryCast(field, Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormTextField)
            ' if field is text field
            If textField IsNot Nothing Then
                ' set new value of the field
                textField.Value = New Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormTextFieldStringValue(document, newValue)

                Return True
            End If
        End If
    End If
    Return False
End Function

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