public static CollectionChanges <T> CollectionChanges(IEnumerable <T> liveEntities, IEnumerable <T> storeEntities)
{
CollectionChanges <T> collectionChanges = new CollectionChanges <T>();
if (liveEntities != null && liveEntities.Count() > 0)
{
if (storeEntities != null && storeEntities.Count() > 0)
{
collectionChanges = CollectionChangesWhenThereAreRecords(liveEntities, storeEntities);
}
else
{
collectionChanges = new CollectionChanges <T>
{
Added = liveEntities.ToList()
};
}
}
else if (storeEntities != null && storeEntities.Count() > 0)
{
if (liveEntities != null && liveEntities.Count() > 0)
{
collectionChanges = CollectionChangesWhenThereAreRecords(liveEntities, storeEntities);
}
else
{
collectionChanges = new CollectionChanges <T>
{
Deleted = storeEntities.ToList()
};
}
}
return(collectionChanges);
}
private static CollectionChanges <T> CollectionChangesWhenThereAreRecords(IEnumerable <T> liveEntities, IEnumerable <T> storeEntities)
{
List <T> addedEntities = liveEntities.Where(live => live.Id == 0).ToList();
List <T> removedEntities = storeEntities.Where(store => !liveEntities.Select(live => live.Id).Contains(store.Id)).ToList();
List <T> updatedEntities = (from live in liveEntities
join store in storeEntities on live.Id equals store.Id
where !live.Equals(store)
select live).ToList();
CollectionChanges <T> collectionChanges = new CollectionChanges <T>
{
Added = addedEntities,
Deleted = removedEntities,
Updated = updatedEntities
};
return(collectionChanges);
}
