//public static void Attach<TEntity>(this ObjectSet<TEntity> objectSet, TEntity entity, Action<TEntity> callback, params Expression<Func<object>>[] entityKeyExpressions) where TEntity : class
//{
// objectSet.Attach(entity, callback, objectSet.EntityKey(entityKeyExpressions));
//}
public static void AttachAll <TEntity>(this ObjectSet <TEntity> objectSet, IAssociatableCollection <TEntity> entities, Func <ObjectSet <TEntity>, TEntity, bool> predicate) where TEntity : class
{
var cascadableCollection = entities as ICascadableCollection <TEntity>;
foreach (var i in entities.ToArray())
{
if (!objectSet.HasAttached(i))
{
var entityKey = objectSet.CreateEntityKey(i);
if (objectSet.HasAttached(entityKey))
{
if (cascadableCollection != null)
{
cascadableCollection.Remove(i, false);
}
else
{
entities.Remove(i);
}
entities.Add(objectSet.GetObjectByKey(entityKey));
}
else
{
if (predicate(objectSet, i))
{
objectSet.Attach(i);
}
}
}
}
if (cascadableCollection != null)
{
foreach (var i in cascadableCollection.Added)
{
if (objectSet.HasAttached(i))
{
objectSet.DeleteObject(i);
}
else
{
var entityKey = objectSet.CreateEntityKey(i);
if (objectSet.HasAttached(entityKey))
{
objectSet.DeleteObject(objectSet.GetObjectByKey(entityKey));
}
else
{
if (predicate(objectSet, i))
{
objectSet.Attach(i);
objectSet.DeleteObject(i);
}
}
}
}
}
}
public static bool TryFixAll <TEntity, TForeginKey>(this ObjectSet <TEntity> list, IAssociatableCollection <TEntity> collection, TForeginKey value, Expression <Func <TEntity, TForeginKey> > field)
where TEntity : class
{
var fieldName = ((MemberExpression)field.Body).Member.Name;
foreach (var i in collection.Added)
{
list.TryAttach(i, true);
i.Members().Properties[fieldName] = value;
}
foreach (var i in collection.Removed)
{
list.TryAttach(i);
i.Members().Properties[fieldName] = null;
}
return(true);
}
