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 storageAccessor = deferredMember.StorageAccessor;
if (!storageAccessor.HasAssignedValue(current) && !storageAccessor.HasLoadedValue(current))
{
var deferredSourceAccessor = deferredMember.DeferredSourceAccessor;
var boxedValue = (IEnumerable)deferredSourceAccessor.GetBoxedValue(current);
if (boxedValue == null)
{
boxedValue = tracker.services.GetDeferredSourceFactory(deferredMember)
.CreateDeferredSource(current);
deferredSourceAccessor.SetBoxedValue(ref current, boxedValue);
}
else if (!haveInitializedDeferredLoaders)
{
throw Error.CannotAttachAddNonNewEntities();
}
}
}
private bool HasDeferredLoader(MetaDataMember deferredMember)
{
if (!deferredMember.IsDeferred)
{
return(false);
}
MetaAccessor storageAccessor = deferredMember.StorageAccessor;
if (storageAccessor.HasAssignedValue(current) || storageAccessor.HasLoadedValue(current))
{
return(false);
}
var boxedValue =
(IEnumerable)deferredMember.DeferredSourceAccessor.GetBoxedValue(current);
#if DEBUG
boxedValue = (IEnumerable)deferredMember.DeferredSourceAccessor.GetBoxedValue(current);
#endif
return(boxedValue != 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();
}
}
}