ObjectStateManager.GetObjectStateEntry Método

public:
 System::Data::Objects::ObjectStateEntry ^ GetObjectStateEntry(System::Data::EntityKey ^ key);

public System.Data.Objects.ObjectStateEntry GetObjectStateEntry(System.Data.EntityKey key);

member this.GetObjectStateEntry : System.Data.EntityKey -> System.Data.Objects.ObjectStateEntry

Public Function GetObjectStateEntry (key As EntityKey) As ObjectStateEntry

Parámetros

Devoluciones

correspondiente ObjectStateEntry al objeto especificado EntityKey.

Excepciones

Ejemplos

En este ejemplo se obtiene el ObjectStateEntry para el objeto especificado EntityKey de .ObjectStateManager A continuación, obtiene el valor actual de la SalesOrderHeader.PurchaseOrderNumber propiedad, cambia el valor de la propiedad y enumera a través de la colección de propiedades modificadas.

// Specify the order to update.
int orderId = 43680;

using (AdventureWorksEntities context =
    new AdventureWorksEntities())
{
    try
    {
        var order = (from o in context.SalesOrderHeaders
                     where o.SalesOrderID == orderId
                     select o).First();

        // Change the status of an existing order.
        order.Status = 1;

        // Delete the first item in the order.
        context.DeleteObject(order.SalesOrderDetails.First());

        // Create a new SalesOrderDetail object.
        // You can use the static CreateObjectName method (the Entity Framework
        // adds this method to the generated entity types) instead of the new operator:
        // SalesOrderDetail.CreateSalesOrderDetail(1, 0, 2, 750, 1, (decimal)2171.2942, 0, 0,
        //                                         Guid.NewGuid(), DateTime.Today));
        SalesOrderDetail detail = new SalesOrderDetail
        {
            SalesOrderID = 0,
            SalesOrderDetailID = 0,
            OrderQty = 2,
            ProductID = 750,
            SpecialOfferID = 1,
            UnitPrice = (decimal)2171.2942,
            UnitPriceDiscount = 0,
            LineTotal = 0,
            rowguid = Guid.NewGuid(),
            ModifiedDate = DateTime.Now
        };
        order.SalesOrderDetails.Add(detail);

        // Get the ObjectStateEntry for the order.
        ObjectStateEntry stateEntry =
            context.ObjectStateManager
            .GetObjectStateEntry(order);
        Console.WriteLine("State before SaveChanges() is called: {0}",
            stateEntry.State.ToString());

        // Save changes in the object context to the database.
        int changes = context.SaveChanges();

        Console.WriteLine("State after SaveChanges() is called: {0}",
            stateEntry.State.ToString());

        Console.WriteLine(changes.ToString() + " changes saved!");
        Console.WriteLine("Updated item for order ID: "
            + order.SalesOrderID.ToString());

        // Iterate through the collection of SalesOrderDetail items.
        foreach (SalesOrderDetail item in order.SalesOrderDetails)
        {
            Console.WriteLine("Item ID: "
                + item.SalesOrderDetailID.ToString() + "  Product: "
                + item.ProductID.ToString() + "  Quantity: "
                + item.OrderQty.ToString());
        }
    }
    catch (UpdateException ex)
    {
        Console.WriteLine(ex.ToString());
    }
}

Comentarios

Utilice el TryGetObjectStateEntry(EntityKey, ObjectStateEntry) método para devolver un ObjectStateEntry objeto sin tener que controlar el InvalidOperationException generado por el GetObjectStateEntry(EntityKey) método .

public:
 System::Data::Objects::ObjectStateEntry ^ GetObjectStateEntry(System::Object ^ entity);

public System.Data.Objects.ObjectStateEntry GetObjectStateEntry(object entity);

member this.GetObjectStateEntry : obj -> System.Data.Objects.ObjectStateEntry

Public Function GetObjectStateEntry (entity As Object) As ObjectStateEntry

Parámetros

Devoluciones

correspondiente ObjectStateEntry al objeto especificado Object.

Excepciones

Comentarios

Utilice el TryGetObjectStateEntry(Object, ObjectStateEntry) método para devolver un ObjectStateEntry objeto sin tener que controlar el InvalidOperationException generado por el GetObjectStateEntry(Object) método .