ObjectStateManager.TryGetObjectStateEntry 메서드

public:
 bool TryGetObjectStateEntry(System::Data::EntityKey ^ key, [Runtime::InteropServices::Out] System::Data::Objects::ObjectStateEntry ^ % entry);

public bool TryGetObjectStateEntry(System.Data.EntityKey key, out System.Data.Objects.ObjectStateEntry entry);

member this.TryGetObjectStateEntry : System.Data.EntityKey * ObjectStateEntry -> bool

Public Function TryGetObjectStateEntry (key As EntityKey, ByRef entry As ObjectStateEntry) As Boolean

매개 변수

반품

지정된 EntityKey값에 해당하는 ObjectStateEntry 부울 값입니다true. 그렇지 않으면 false.

예외

예제

다음 예제에서는 지정된 EntityKey에 해당하는 ObjectStateEntry 값을 검색하려고 시도합니다.

int orderId = 43680;

using (AdventureWorksEntities context =
    new AdventureWorksEntities())
{
    ObjectStateManager objectStateManager = context.ObjectStateManager;
    ObjectStateEntry stateEntry = null;

    var order = (from o in context.SalesOrderHeaders
                 where o.SalesOrderID == orderId
                 select o).First();

    // Attempts to retrieve ObjectStateEntry for the given EntityKey.
    bool isPresent = objectStateManager.TryGetObjectStateEntry(((IEntityWithKey)order).EntityKey, out stateEntry);
    if (isPresent)
    {
        Console.WriteLine("The entity was found");
    }
}

다음 예제에서는 반환 ObjectStateManager 된 TryGetObjectStateEntry(EntityKey, ObjectStateEntry) 메서드를 사용하여 엔터티 키를 기반으로 개체를 가져옵니다.

private static void ApplyItemUpdates(SalesOrderDetail originalItem,
    SalesOrderDetail updatedItem)
{
    using (AdventureWorksEntities context =
        new AdventureWorksEntities())
    {
        context.SalesOrderDetails.Attach(updatedItem);
        // Check if the ID is 0, if it is the item is new.
        // In this case we need to chage the state to Added.
        if (updatedItem.SalesOrderDetailID == 0)
        {
            // Because the ID is generated by the database we do not need to
            // set updatedItem.SalesOrderDetailID.
            context.ObjectStateManager.ChangeObjectState(updatedItem, System.Data.EntityState.Added);
        }
        else
        {
            // If the SalesOrderDetailID is not 0, then the item is not new
            // and needs to be updated. Because we already added the
            // updated object to the context we need to apply the original values.
            // If we attached originalItem to the context
            // we would need to apply the current values:
            // context.ApplyCurrentValues("SalesOrderDetails", updatedItem);
            // Applying current or original values, changes the state
            // of the attached object to Modified.
            context.ApplyOriginalValues("SalesOrderDetails", originalItem);
        }
        context.SaveChanges();
    }
}

설명

메서드에서 발생된 ObjectStateEntry 값을 처리 InvalidOperationException 할 필요 없이 반환하는 GetObjectStateEntry(EntityKey) 데 사용합니다TryGetObjectStateEntry(EntityKey, ObjectStateEntry).

public:
 bool TryGetObjectStateEntry(System::Object ^ entity, [Runtime::InteropServices::Out] System::Data::Objects::ObjectStateEntry ^ % entry);

public bool TryGetObjectStateEntry(object entity, out System.Data.Objects.ObjectStateEntry entry);

member this.TryGetObjectStateEntry : obj * ObjectStateEntry -> bool

Public Function TryGetObjectStateEntry (entity As Object, ByRef entry As ObjectStateEntry) As Boolean

매개 변수

반품

지정된 개체에 해당하는 ObjectStateEntry 값이 true 있는 경우의 부울 값이고, false그렇지 않으면 .

설명

메서드에서 TryGetObjectStateEntry(Object, ObjectStateEntry) 발생된 ObjectStateEntry 값을 처리할 필요 없이 메서드를 InvalidOperationException 사용하여 반환합니다 GetObjectStateEntry(Object) .