private IReadOnlyDictionary <string, object> CalculateAdditionalAttributes()
{
var additionalAttributes = AdditionalAttributes?.ToDictionary(pair => pair.Key, pair => pair.Value)
?? new Dictionary <string, object>();
if (!additionalAttributes.ContainsKey(HtmlAttributeNames.CLASS))
{
additionalAttributes.Add(HtmlAttributeNames.CLASS, string.Empty);
}
additionalAttributes[HtmlAttributeNames.CLASS] = CssBuilder
.AddClass(
additionalAttributes[HtmlAttributeNames.CLASS] as string,
!string.IsNullOrWhiteSpace(additionalAttributes[HtmlAttributeNames.CLASS] as string))
.Build();
return(new ReadOnlyDictionary <string, object>(additionalAttributes));
}