private TDataObj _GetDataObject(EntityObject entity)
{
TDataObj obj = null;
if (_owner.IsStored)
{
// Try to find data object through IWrapDataAccess.
obj = DataObjectHelper.GetDataObject(entity) as TDataObj;
if (obj == null)
{
DataObjectContext ctx = ContextHelper.GetObjectContext(
_entityRef);
obj = DataObjectHelper.GetOrCreateDataObject <TDataObj>(ctx,
entity);
}
}
else
{
obj = DataObjectHelper.GetDataObject(entity) as TDataObj;
if (obj == null)
{
throw new DataException(Properties.Messages.Error_InvalidDataObjectInstance);
}
}
return(obj);
}
/// <summary>
/// Retrieves data objects from the specified source.
/// </summary>
/// <typeparam name="T">The type of data objects to be retrieved.</typeparam>
/// <typeparam name="TEntity">The type of source entities.</typeparam>
/// <param name="source">The source of data objects to be retrieved.</param>
/// <returns>A collection of data objects from the specified source.</returns>
private IEnumerable <T> _FindObjects <T, TEntity>(IQueryable <TEntity> source)
where T : DataObject
where TEntity : EntityObject
{
foreach (var entity in source)
{
yield return(DataObjectHelper.GetOrCreateDataObject <T>(_context, entity));
}
}
/// <summary>
/// Retrieves data object by specified key name and object id.
/// </summary>
/// <param name="key">
/// EntityKey object that represents entity id.
/// </param>
/// <returns>
/// Generic data object. Null value is returned if the data object
/// cannot be found.
/// </returns>
protected T FindObjectById <T>(EntityKey key)
where T : DataObject
{
Debug.Assert(key != null);
T obj = default(T);
object entity = null;
if (_context.TryGetObjectByKey(key, out entity))
{
obj = DataObjectHelper.GetOrCreateDataObject <T>(_context,
entity as EntityObject);
}
return(obj);
}