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VB.NET ObjectStateManager.GetObjectStateEntry方法代码示例

本文整理汇总了VB.NET中System.Data.Objects.ObjectStateManager.GetObjectStateEntry方法的典型用法代码示例。如果您正苦于以下问题:VB.NET ObjectStateManager.GetObjectStateEntry方法的具体用法?VB.NET ObjectStateManager.GetObjectStateEntry怎么用?VB.NET ObjectStateManager.GetObjectStateEntry使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在System.Data.Objects.ObjectStateManager的用法示例。


在下文中一共展示了ObjectStateManager.GetObjectStateEntry方法的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的VB.NET代码示例。

示例1: AdventureWorksEntities

' Specify the order to update. 
Dim orderId As Integer = 43680

Using context As New AdventureWorksEntities()
    Try
        Dim 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)); 
        Dim detail = New SalesOrderDetail With
        {
            .SalesOrderID = 0,
            .SalesOrderDetailID = 0,
            .OrderQty = 2,
            .ProductID = 750,
            .SpecialOfferID = 1,
            .UnitPrice = CDec(2171.2942),
            .UnitPriceDiscount = 0,
            .LineTotal = 0,
            .rowguid = Guid.NewGuid(),
            .ModifiedDate = DateTime.Now
        }

        order.SalesOrderDetails.Add(detail)

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

        ' Save changes in the object context to the database. 
        Dim changes As Integer = 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. 
        For Each item As SalesOrderDetail In order.SalesOrderDetails
            Console.WriteLine("Item ID: {0}", item.SalesOrderDetailID.ToString())
            Console.WriteLine("Product: {0}", item.ProductID.ToString())
            Console.WriteLine("Quantity: {0}", item.OrderQty.ToString())
        Next
    Catch ex As UpdateException
        Console.WriteLine(ex.ToString())
    End Try
End Using
开发者ID:VB.NET开发者,项目名称:System.Data.Objects,代码行数:58,代码来源:ObjectStateManager.GetObjectStateEntry


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