private bool HasDeferredLoader(MetaDataMember deferredMember)
{
if (!deferredMember.IsDeferred)
{
return(false);
}
MetaAccessor acc = deferredMember.StorageAccessor;
if (acc.HasAssignedValue(this.current) || acc.HasLoadedValue(this.current))
{
return(false);
}
MetaAccessor dsacc = deferredMember.DeferredSourceAccessor;
IEnumerable loader = (IEnumerable)dsacc.GetBoxedValue(this.current);
return(loader != null);
}
private void InitializeDeferredLoader(MetaDataMember deferredMember)
{
MetaAccessor acc = deferredMember.StorageAccessor;
if (!acc.HasAssignedValue(this.current) && !acc.HasLoadedValue(this.current))
{
MetaAccessor dsacc = deferredMember.DeferredSourceAccessor;
IEnumerable loader = (IEnumerable)dsacc.GetBoxedValue(this.current);
// don't reset loader on any deferred member that already has one
if (loader == null)
{
IDeferredSourceFactory factory = this.tracker.services.GetDeferredSourceFactory(deferredMember);
loader = factory.CreateDeferredSource(this.current);
dsacc.SetBoxedValue(ref this.current, loader);
}
else if (loader != null && !haveInitializedDeferredLoaders)
{
// If loader is present but wasn't generated by us, then
// an attempt to Attach or Add an entity from another context
// has been made, which is not supported.
throw Error.CannotAttachAddNonNewEntities();
}
}
}
private void AutoSyncMembers(object[] syncResults, TrackedObject item, UpdateType updateType, AutoSyncBehavior autoSyncBehavior)
{
System.Diagnostics.Debug.Assert(item != null);
System.Diagnostics.Debug.Assert(item.IsNew || item.IsPossiblyModified, "AutoSyncMembers should only be called for new and modified objects.");
object[] syncRollbackValues = null;
if (syncResults != null)
{
int idx = 0;
var membersToSync = GetAutoSyncMembers(item.Type, updateType);
System.Diagnostics.Debug.Assert(syncResults.Length == membersToSync.Count);
if (autoSyncBehavior == AutoSyncBehavior.ApplyNewAutoSync)
{
syncRollbackValues = new object[syncResults.Length];
}
foreach (MetaDataMember mm in membersToSync)
{
object value = syncResults[idx];
object current = item.Current;
MetaAccessor accessor =
(mm.Member is PropertyInfo && ((PropertyInfo)mm.Member).CanWrite)
? mm.MemberAccessor
: mm.StorageAccessor;
if (syncRollbackValues != null)
{
syncRollbackValues[idx] = accessor.GetBoxedValue(current);
}
accessor.SetBoxedValue(ref current, DBConvert.ChangeType(value, mm.Type));
idx++;
}
}
if (syncRollbackValues != null)
{
this.SyncRollbackItems.Add(new KeyValuePair <TrackedObject, object[]>(item, syncRollbackValues));
}
}