public async Task <PropertyProviderData> GetProvider(IPropertyProvider provider, int providerID)
{
var plainProviderAttributes = await provider.GetAttributes();
var plainProviderRelations = await provider.GetRelations();
var plainProviderEvents = await provider.GetEvents();
var attributes = await Task.WhenAll(plainProviderAttributes.Select(attr => GetAttachedAttribute(attr)));
var relations = await Task.WhenAll(plainProviderRelations.Select(relation => GetAttachedRelation(relation)));
var events = await Task.WhenAll(plainProviderEvents.Select(e => GetAttachedEvent(e)));
var attributesDict = attributes.ToDictionary(
k => k.Attribute.ID,
v => v
);
var relationsDict = relations.ToDictionary(
k => k.Relation.PropertyID,
v => v
);
var eventsDict = events.ToDictionary(
k => k.Property.PropertyID,
v => v
);
return(new PropertyProviderData(attributesDict, relationsDict, eventsDict, providerID));
}