COM+ 上的属性已重置如果调用 ContextUtil.SetComplete() 则为对象
我已经将两个类部署为 COM+ 组件,假设为 ClassA 和 ClassB。 ClassA 有一些公共属性。 ClassB 为这些属性设置值并调用 ClassA 的方法。该方法本身不会修改属性的值。
调用后,属性值将重置为相应类型的默认值。仅当被调用的方法包含语句 ContextUtil.SetComplete() 时才会发生这种情况。一旦我注释掉该语句,属性的值将保持与方法调用之前相同,这正是我所期望的。
我是否忽略了 COM+ 对象及其上下文的一些基本概念?我希望在任何情况下房产价值都保持不变。
这是代码的简化列表:
Option Strict Off
Option Explicit On
Imports System.EnterpriseServices
<Transaction(TransactionOption.Required)> _
Public Class ClassA
Inherits ServicedComponent
Private _propertyA As String
Public Property PropertyA() As String
Get
Return Me._propertyA
End Get
Set(ByVal Value As String)
Me._propertyA = Value
End Set
End Property
Public Sub MethodA()
' Do something
ContextUtil.SetComplete() ' If this is called the Str property is reset after return from this call
End Sub
End Class
<Transaction(TransactionOption.Required)> _
Public Class ClassB
Inherits ServicedComponent
Public Sub MethodB()
Dim a As ClassA = New ClassA()
a.PropertyA = "A"
a.MethodA()
' After this call the value of a.PropertyA is reset to Nothing if ContextUtil.SetComplete() was called inside MethodA()
End Sub
End Class
I've got two classes deployed as COM+ components, let's say ClassA and ClassB. ClassA has some public properties. ClassB sets values for those properties and calls a method of ClassA. The method itself does not modify the value of the property.
After the call the values of the properties are reset to default values for the corresponding types. This only happens if the called method includes statement ContextUtil.SetComplete(). Once I comment out the statetment the values of the properties remain same as they were before the method call, which is what I expect.
Do I overllok some basic concept of COM+ objects and their contexts? I would expect the property value to remain the same in any case.
Here's the simplified listing for the code:
Option Strict Off
Option Explicit On
Imports System.EnterpriseServices
<Transaction(TransactionOption.Required)> _
Public Class ClassA
Inherits ServicedComponent
Private _propertyA As String
Public Property PropertyA() As String
Get
Return Me._propertyA
End Get
Set(ByVal Value As String)
Me._propertyA = Value
End Set
End Property
Public Sub MethodA()
' Do something
ContextUtil.SetComplete() ' If this is called the Str property is reset after return from this call
End Sub
End Class
<Transaction(TransactionOption.Required)> _
Public Class ClassB
Inherits ServicedComponent
Public Sub MethodB()
Dim a As ClassA = New ClassA()
a.PropertyA = "A"
a.MethodA()
' After this call the value of a.PropertyA is reset to Nothing if ContextUtil.SetComplete() was called inside MethodA()
End Sub
End Class
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您是否尝试过在事务上调用 Commit,即:ContextUtil.MyTransactionVote = TransactionVote.Commit。您可能正在进行更改,然后将上下文设置为在更改实际提交之前完成。
Have you tried calling Commit on the Transaction, IE: ContextUtil.MyTransactionVote = TransactionVote.Commit. It could be that you are making changes and then setting the Context to complete before the changes have actually been committed.