本文整理汇总了VB.NET中System.Data.EntityKey.EntityKey构造函数的典型用法代码示例。如果您正苦于以下问题：VB.NET EntityKey构造函数的具体用法？VB.NET EntityKey怎么用？VB.NET EntityKey使用的例子？那么, 这里精选的构造函数代码示例或许可以为您提供帮助。您也可以进一步了解该构造函数所在类System.Data.EntityKey的用法示例。
在下文中一共展示了EntityKey构造函数的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
Using context As New AdventureWorksEntities()
Try
' Create the key that represents the order.
Dim orderKey As New EntityKey("AdventureWorksEntities.SalesOrderHeaders", "SalesOrderID", orderId)
' Create the stand-in SalesOrderHeader object
' based on the specified SalesOrderID.
Dim order As New SalesOrderHeader()
order.EntityKey = orderKey
' Assign the ID to the SalesOrderID property to matche the key.
order.SalesOrderID = CInt(orderKey.EntityKeyValues(0).Value)
' Attach the stand-in SalesOrderHeader object.
context.SalesOrderHeaders.Attach(order)
' 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)
context.SaveChanges()
Catch generatedExceptionName As InvalidOperationException
Console.WriteLine("Ensure that the key value matches the value of the object's ID property.")
Catch generatedExceptionName As UpdateException
Console.WriteLine("An error has occurred. Ensure that an object with the '{0}' key value exists.", orderId)
End Try
End Using