internal IEnumerable <T> TryGetCachedModel <T>(ISPListItemAdapter source, string fieldName, params int[] lookupIds)
{
List <T> collection = new List <T>();
SPObjectCache cache = this.Manager.ObjectCache;
SPFieldLookup lookupField = cache.GetField(source.WebId, source.ListId, fieldName) as SPFieldLookup;
if (lookupField != null)
{
if (hashtable == null)
{
hashtable = new Hashtable();
}
Guid listId = lookupField.LookupList == "Self" ? source.ListId : new Guid(lookupField.LookupList);
List <int> lookupIdsToQuery = new List <int>();
foreach (int id in lookupIds)
{
LookupKey key = new LookupKey(listId, id);
if (hashtable.ContainsKey(key))
{
object cachedItem = hashtable[key];
if (cachedItem is T)
{
collection.Add((T)cachedItem);
}
}
else
{
lookupIdsToQuery.Add(id);
}
}
if (lookupIdsToQuery.Count > 0)
{
ISPModelManagerInternal manager = hashtable.EnsureKeyValue(typeof(T), () => (ISPModelManagerInternal)SPModel.GetDefaultManager(typeof(T), this.manager.Site.RootWeb, cache));
SPList list = cache.GetList(lookupField.LookupWebId, listId);
SPQuery query = new SPQuery {
Query = Caml.EqualsAny(SPBuiltInFieldName.ID, lookupIdsToQuery).ToString()
};
foreach (SPListItem item in list.GetItems(query))
{
object model = manager.TryCreateModel(new SPListItemAdapter(item, cache), false);
hashtable[new LookupKey(listId, item.ID)] = model;
if (model is T)
{
collection.Add((T)model);
}
cache.AddListItem(item);
}
}
}
return(collection);
}
/// <summary>
/// Creates a model object representing the list item.
/// </summary>
/// <param name="adapter">A data access adapter of the list item.</param>
/// <returns>A model object or *null* if there is no types associated with the content type of the list item.</returns>
public static SPModel TryCreate(ISPListItemAdapter adapter)
{
CommonHelper.ConfirmNotNull(adapter, "adapter");
SPContentTypeId contentTypeId;
try {
contentTypeId = adapter.ContentTypeId;
} catch (MemberAccessException) {
return(null);
}
SPModelDescriptor descriptor;
try {
descriptor = SPModelDescriptor.Resolve(contentTypeId, adapter.Site);
} catch (ArgumentException) {
return(null);
}
ISPModelManagerInternal manager = descriptor.CreateManager(adapter.Web);
return(manager.TryCreateModel(adapter, false));
}