Introduction

public static void GetFormFields()
{
  Console.WriteLine( "=== GET FORM FIELDS ===" );
  var fileName = "employment_form.pdf";
  PageFormFieldCollection formFields;

  // Loads a PdfDocument.
  using( var pdfDoc = PdfDocument.Load( FormFieldsSample.FormFieldsSampleResourcesDirectory + $"{fileName}" ) )
  {
    // Gets the first Page of the loaded document.
    var page = pdfDoc.Pages[ 0 ];

    // Gets the FormFields on the Page.
    formFields = page.FormFields;
  }

  var outputFileName = "GetFormFields.pdf";
  var outputPath = FormFieldsSample.FormFieldsSampleOutputDirectory + outputFileName;

  // Creates a PdfDocument.
  using( var pdfoutput = PdfDocument.Create( outputPath ) )
  {
    // Gets the first Page.
    var page = pdfoutput.Pages.First();

    // Adds a title.
    var titleStyle = TextStyle.WithFont( pdfoutput.Fonts.GetStandardFont( StandardFontType.Helvetica ), 15d );
    page.AddParagraph( "Get FormFields", titleStyle, new ParagraphStyle( ParagraphHorizontalAlignment.Center ) );

    if( formFields.Count > 0 )
    {
      // Adds Courier red text.
      var redTextStyle = TextStyle.WithFontAndColor( pdfoutput.Fonts.GetStandardFont( StandardFontType.Courier ), 12d, Brushes.Red );
      page.AddText( $"Form fields extracted from: {fileName}", new Point( 25, 70 ), redTextStyle );

      // Adds Courier text.
      var textStyle = TextStyle.WithFont( pdfoutput.Fonts.GetStandardFont( StandardFontType.Courier ), 12d );
      page.AddText( $"Total form fields on page: {formFields.Count}", new Point( 25, 90 ), textStyle );

      // Shows the information related to the first 5 fields.
      for( int i = 0; i < Math.Min( 5, formFields.Count ); i++ )
      {
        var field = formFields[ i ];

        // Adds text related to a specific FormField.
        page.AddText( $"Field {i + 1}: '{field.Name}'", new Point( 25, 120 + ( i * 75 ) ), textStyle );
        page.AddText( $"  Type: {field.GetType().Name}", new Point( 25, 135 + ( i * 75 ) ), textStyle );
        page.AddText( $"  Location: ({field.Bounds.Left:F0}, {field.Bounds.Top:F0})", new Point( 25, 150 + ( i * 75 ) ), textStyle );
        page.AddText( $"  Dimensions: {field.Bounds.Width:F0} x {field.Bounds.Height:F0}", new Point( 25, 165 + ( i * 75 ) ), textStyle );
        page.AddText( $"  Read only: {field.IsReadOnly}", new Point( 25, 180  + ( i * 75 )), textStyle );
      }

      // Saves the output document.
      pdfoutput.Save();
      Console.WriteLine( $"Info exported to path: {outputFileName}" );
    }
    else
    {
      Console.WriteLine( "No form fields found in this document." );
    }
  }
}