ObjectStateManager::ChangeRelationshipState<TEntity> Method (TEntity, Object^, Expression<Func<TEntity, Object^>^>^, EntityState)

.NET Framework (current version)
 

Changes the state of the relationship between two entity objects that is specified based on the two related objects and a LINQ expression that defines the navigation property.

Namespace:   System.Data.Objects
Assembly:  System.Data.Entity (in System.Data.Entity.dll)

public:
generic<typename TEntity>
where TEntity : ref class
ObjectStateEntry^ ChangeRelationshipState(
	TEntity sourceEntity,
	Object^ targetEntity,
	Expression<Func<TEntity, Object^>^>^ navigationPropertySelector,
	EntityState relationshipState
)

Parameters

sourceEntity
Type: TEntity

The object instance or EntityKey of the source entity at one end of the relationship.

targetEntity
Type: System::Object^

The object instance or EntityKey of the target entity at the other end of the relationship.

navigationPropertySelector
Type: System.Linq.Expressions::Expression<Func<TEntity, Object^>^>^

A LINQ expression that selects the navigation property on source that returns the specified target.

relationshipState
Type: System.Data::EntityState

The requested EntityState of the specified relationship.

Return Value

Type: System.Data.Objects::ObjectStateEntry^

The ObjectStateEntry for the relationship that was changed.

Type Parameters

TEntity

The entity type of the source object.

Exception Condition
ArgumentNullException

When source, target, or selector is null.

ArgumentException

selector is malformed or cannot return a navigation property.

InvalidOperationException

When you try to change the state of the relationship to a state other than Deleted or Detached when either source or target is in a Deleted state.

-or-

When you try to change the state of the relationship to a state other than Added or Detached when either source or target is in an Added state.

-or-

When state is not a valid EntityState value.

Entries for the objects at both ends of the specified relationship must exist in the ObjectStateManager.

System_CAPS_noteNote

This method is not supported for relationships that are based on a foreign key association.

.NET Framework
Available since 4.0
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