在 Silverlight 中，将自定义属性添加到生成的 Linq 类中管理事件

发布于 2024-10-06 01:05:40 字数 1268 浏览 1 评论 0原文

我在 WCF 中使用 Linq to SQL 类。这些类从 WCF 方法返回到 Silverlight。现在，我想在生成的类（Silverlight 侧）上添加自定义属性，并根据另一个属性中的另一个 PropertyChangedEvent 触发该特定属性上的 PropertyChangedEvent。需要明确的是，这里有一段不起作用的代码： <代码>

    Partial Public Class DataConnection

            Public Sub New()
                AddHandler Me.PropertyChanged, AddressOf _PropertyChanged
            End Sub

        Private Sub _PropertyChanged(ByVal sender As Object, ByVal e As PropertyChangedEventArgs)
            If e.PropertyName = "ConnectionType" Then
                Me.RaisePropertyChanged("ConnectionTypeEnum")
            End If
        End Sub

        Private _ConnectionTypeEnum As String
        Public ReadOnly Property ConnectionTypeEnum() As String
            Get
                Select Case Me.ConnectionType
                    Return //Something based on ConnectionType //
                End Select
            End Get
        End Property


    End Class

The problem is that the code in New() is never executed, so I never know when the ConnectionType is changed, so I can't trigger the PropertyChanged on ConnectionTypeEnum. (this property is used a in One-Way binding so I need it)

有人有解决方案吗？

谢谢

原文

I'm using Linq to SQL classes in my WCF. Those classes are returned from the WCF methods to the Silverlight. Now, I want to add a custom property on a the generated class (Silverlight side) and trigger a PropertyChangedEvent on that particular property, based on another PropertyChangedEvent from another property. To be clear, here's a piece of code that doesn't work :

Partial Public Class DataConnection
Public Sub New() AddHandler Me.PropertyChanged, AddressOf _PropertyChanged End Sub

        Private Sub _PropertyChanged(ByVal sender As Object, ByVal e As PropertyChangedEventArgs)
            If e.PropertyName = "ConnectionType" Then
                Me.RaisePropertyChanged("ConnectionTypeEnum")
            End If
        End Sub

        Private _ConnectionTypeEnum As String
        Public ReadOnly Property ConnectionTypeEnum() As String
            Get
                Select Case Me.ConnectionType
                    Return //Something based on ConnectionType //
                End Select
            End Get
        End Property


    End Class

Does anyone have a solution for this ?

Thanks

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葮薆情 2024-10-13 01:05:40

您可以使用 OnDeserializedAttribute< /a>

<OnDeserializedAttribute()> _
Public Sub WhenDeserialized(context As StreamingContext)
    AddHandler Me.PropertyChanged, AddressOf _PropertyChanged
End Sub

You can use OnDeserializedAttribute

<OnDeserializedAttribute()> _
Public Sub WhenDeserialized(context As StreamingContext)
    AddHandler Me.PropertyChanged, AddressOf _PropertyChanged
End Sub

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