protected virtual ITagHelperProvider GetTagHelperProvider(IDependencyResolver resolver, ControllerContext controllerContext)
{
var helperContainer = new ActionTagHelperContainer(resolver, controllerContext);
foreach (var kvp in GetTagHandlers())
helperContainer.Register(kvp.Key, kvp.Value);
if (_customTagHandlers != null)
{
foreach (var kvp in _customTagHandlers)
helperContainer.Register(kvp.Key, kvp.Value);
}
return helperContainer;
}