When the code accesses one of these relationships, null is returned if the relationship is one-to-one, and an empty collection is returned if it is one-to-many. The relationships can still be filled by setting the LoadOptions property.
The main scenario for this property is to enable you to extract a piece of the object model and send it out (for example, to a Web service).
.gif "Note") Note: |
|---|
If this property is set to
false after a query has been executed, an exception is thrown. See the Valid Modes section below for more information.
|
Valid modes
Deferred loading requires object tracking. Only the following three modes are valid:
ObjectTrackingEnabled = false. DeferredLoadingEnabled is ignored and inferred to be false. This behavior corresponds to a read-only DataContext.
ObjectTrackingEnabled = true. DeferredLoadingEnabled = false. This situation corresponds to a DataContext that allows users to load an object graph by using LoadWith directives, but it does not enable deferred loading.
Both are set to true. This is the default.
The flags may not be changed after a query has been executed. Any change after the execution of the first query that uses that DataContext throws an exception.