test.cs

private bool IsCharacterFormatEqual(Paragraph paragraph, ParagraphStyle paragraphStyle)
{
  paragraph.Select();
  var selection = _textControl.Selection;

  foreach (var property in typeof(Selection).GetProperties())
  {
    if (!_positiveListCharacterFormat.Contains(property.Name))
    {
      continue;
    }

    object value1 = property.GetValue(selection);
    var paragraphStyleProperty = typeof(ParagraphStyle).GetProperty(property.Name)?.GetValue(paragraphStyle);

    // compare the values
    if (!object.Equals(value1, paragraphStyleProperty))
    {
      return false;
    }
  }

  return true;
}