public ExpandActionFilter(Expander expander, Dictionary <string, object> expandContext, Func <object, object, Exception, object> inspector, bool expandAll, JsonSerializerSettings jsonOptions = null, IServiceProvider serviceProvider = null) :
base()
{
_expander = expander;
_context = expandContext;
_inspector = inspector;
_expandAllEndpoints = expandAll;
_serviceProvider = serviceProvider;
JsonSerializerSettings settings = new JsonSerializerSettings();
// if explicit settings are provided, use them
if (jsonOptions != null)
{
settings = jsonOptions.DeepCopy();
}
// otherwise if we got a service provider, try to find it
else if (serviceProvider != null)
{
settings = serviceProvider?
.GetService <IOptions <MvcJsonOptions> >()?
.Value?
.SerializerSettings ?? settings;
}
// Make sure these settings ignore nulls
settings.NullValueHandling = NullValueHandling.Ignore;
_jsonOptions = settings;
}