本文整理汇总了VB.NET中System.Data.Objects.ObjectContext.SaveChanges方法的典型用法代码示例。如果您正苦于以下问题：VB.NET ObjectContext.SaveChanges方法的具体用法？VB.NET ObjectContext.SaveChanges怎么用？VB.NET ObjectContext.SaveChanges使用的例子？那么, 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类System.Data.Objects.ObjectContext的用法示例。
在下文中一共展示了ObjectContext.SaveChanges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
Using context As New AdventureWorksEntities()
Try
' Perform an operation with a high-level of concurrency.
' Change the status of all orders without an approval code.
Dim orders As ObjectQuery(Of SalesOrderHeader) = context.SalesOrderHeaders.Where("it.CreditCardApprovalCode IS NULL").Top("100")
For Each order As SalesOrderHeader In orders
' Reset the order status to 4 = Rejected.
order.Status = 4
Next
Try
' Try to save changes, which may cause a conflict.
Dim num As Integer = context.SaveChanges()
Console.WriteLine("No conflicts. " & num.ToString() & " updates saved.")
Catch generatedExceptionName As OptimisticConcurrencyException
' Resolve the concurrency conflict by refreshing the
' object context before re-saving changes.
context.Refresh(RefreshMode.ClientWins, orders)
' Save changes.
context.SaveChanges()
Console.WriteLine("OptimisticConcurrencyException handled and changes saved")
End Try
For Each order As SalesOrderHeader In orders
Console.WriteLine(("Order ID: " & order.SalesOrderID.ToString() & " Order status: ") + order.Status.ToString())
Next
Catch ex As UpdateException
Console.WriteLine(ex.ToString())
End Try
End Using