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VB.NET EntityReference<TEntity>类代码示例

本文整理汇总了VB.NET中System.Data.Objects.DataClasses.EntityReference<TEntity>的典型用法代码示例。如果您正苦于以下问题:VB.NET EntityReference<TEntity>类的具体用法?VB.NET EntityReference<TEntity>怎么用?VB.NET EntityReference<TEntity>使用的例子?那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。


在下文中一共展示了EntityReference<TEntity>类的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

' Define the order and new address IDs. 
Dim orderId As Integer = 43669
Dim addressId As Integer = 26

Using context As New AdventureWorksEntities()
    ' Get the billing address to change to. 
    Dim address As Address = context.Addresses.Single(Function(c) c.AddressID = addressId)

    ' Get the order being changed. 
    Dim order As SalesOrderHeader = context.SalesOrderHeaders.Single(Function(o) o.SalesOrderID = orderId)

    ' You do not have to call the Load method to load the addresses for the order, 
    ' because lazy loading is set to true 
    ' by the constructor of the AdventureWorksEntities object. 
    ' With lazy loading set to true the related objects are loaded when 
    ' you access the navigation property. In this case Address. 

    ' Write the current billing street address. 
    Console.WriteLine("Current street: " & order.Address.AddressLine1)

    ' Change the billing address. 
    If Not order.Address.Equals(address) Then
        ' Use Address navigation property to change the association. 
        order.Address = address

        ' Write the changed billing street address. 
        Console.WriteLine("Changed street: " & order.Address.AddressLine1)
    End If

    ' If the address change succeeds, save the changes. 
    context.SaveChanges()

    ' Write the current billing street address. 
    Console.WriteLine("Current street: " & order.Address.AddressLine1)
End Using
开发者ID:VB.NET开发者,项目名称:System.Data.Objects.DataClasses,代码行数:35,代码来源:EntityReference


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