如何：附加相关对象（实体框架）
本主题提供有关如何将相关对象附加到对象上下文的示例。 有关更多信息，请参见附加和分离对象（实体框架）。 本主题中的示例基于 Adventure Works 销售模型。 若要运行本示例中的代码，必须已将 AdventureWorks 销售模型添加到您的项目中，并将项目配置为使用实体框架 。 为此，请完成如何：手动配置实体框架项目和如何：手动定义模型和映射文件（实体框架）中的过程。
示例
本示例将已分离的 SalesOrderDetail 对象的集合添加到已分离的 SalesOrderHeader 对象，然后将此对象图附加到对象上下文。
Private Shared Sub AttachObjectGraph(ByVal currentContext As ObjectContext, ByVal detachedOrder As SalesOrderHeader, ByVal detachedItems As List(Of SalesOrderDetail))
' Define the relationships by adding each SalesOrderDetail
' object in the detachedItems List<SalesOrderDetail> collection to the
' EntityCollection on the SalesOrderDetail navigation property of detachedOrder.
For Each item As SalesOrderDetail In detachedItems
detachedOrder.SalesOrderDetails.Add(item)
Next
' Attach the object graph to the supplied context.
currentContext.Attach(detachedOrder)
End Sub
private static void AttachObjectGraph(
ObjectContext currentContext,
SalesOrderHeader detachedOrder,
List<SalesOrderDetail> detachedItems)
{
// Define the relationships by adding each SalesOrderDetail
// object in the detachedItems List<SalesOrderDetail> collection to the
// EntityCollection on the SalesOrderDetail navigation property of detachedOrder.
foreach (SalesOrderDetail item in detachedItems)
{
detachedOrder.SalesOrderDetails.Add(item);
}
// Attach the object graph to the supplied context.
currentContext.Attach(detachedOrder);
}