本文整理匯總了VB.NET中System.Data.Objects.ObjectStateManager.GetObjectStateEntry方法的典型用法代碼示例。如果您正苦於以下問題：VB.NET ObjectStateManager.GetObjectStateEntry方法的具體用法？VB.NET ObjectStateManager.GetObjectStateEntry怎麽用？VB.NET ObjectStateManager.GetObjectStateEntry使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類System.Data.Objects.ObjectStateManager的用法示例。
在下文中一共展示了ObjectStateManager.GetObjectStateEntry方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
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