vb System.Workflow.ComponentModel.Design.WorkflowDesignerLoader.PerformLoad类(方法)实例源码

Protected Overrides Sub PerformLoad(ByVal serializationManager As IDesignerSerializationManager)
    Dim designerHost As IDesignerHost = CType(GetService(GetType(IDesignerHost)), IDesignerHost)
    Dim rootActivity As Activity = Nothing

    ' If a WorkflowType already exists, create an instance instead of reading from file
    If WorkflowType IsNot Nothing Then
        rootActivity = CType(Activator.CreateInstance(WorkflowType), Activity)
    Else
        ' Create a text reader out of the doc data
        Dim reader As TextReader = New StringReader(Me.Xoml)
        Try
            Using xmlReader As XmlReader = xmlReader.Create(reader)
                Dim xomlSerializer As New WorkflowMarkupSerializer()
                rootActivity = CType(xomlSerializer.Deserialize(xmlReader), Activity)
            End Using
        Finally
            reader.Close()
        End Try
    End If

    If rootActivity IsNot Nothing And designerHost IsNot Nothing Then
        AddObjectGraphToDesignerHost(designerHost, rootActivity)
    End If
End Sub

Private Shared Sub AddObjectGraphToDesignerHost(ByVal designerHost As IDesignerHost, ByVal activity As Activity)
    Dim Definitions_Class As New Guid("3FA84B23-B15B-4161-8EB8-37A54EFEEFC7")

    If designerHost IsNot Nothing Then
        Throw New ArgumentNullException("designerHost")
    End If
    If activity IsNot Nothing Then
        Throw New ArgumentNullException("activity")
    End If

    Dim rootSiteName As String = activity.QualifiedName
    If activity.Parent Is Nothing Then
        Dim fullClassName As String = CType(activity.UserData(Definitions_Class), String)
        If fullClassName Is Nothing Then
            fullClassName = activity.GetType().FullName
        End If
        rootSiteName = IIf(Not fullClassName.LastIndexOf(".") = -1, fullClassName.Substring(fullClassName.LastIndexOf(".") + 1), fullClassName)
        designerHost.Container.Add(activity, rootSiteName)
    Else
        designerHost.Container.Add(activity, activity.QualifiedName)
    End If

    If TypeOf activity Is CompositeActivity Then
        For Each activity2 As Activity In GetNestedActivities(CType(activity, CompositeActivity))
            designerHost.Container.Add(activity2, activity2.QualifiedName)
        Next
    End If
End Sub

Private Shared Function GetNestedActivities(ByVal compositeActivity As CompositeActivity) As Activity()
    If compositeActivity Is Nothing Then
        Throw New ArgumentNullException("compositeActivity")
    End If

    Dim childActivities As IList(Of Activity) = Nothing
    Dim nestedActivities As New ArrayList()
    Dim compositeActivities As New Queue()
    compositeActivities.Enqueue(compositeActivity)
    While compositeActivities.Count > 0
        Dim compositeActivity2 As CompositeActivity = CType(compositeActivities.Dequeue(), CompositeActivity)
        childActivities = compositeActivity2.Activities

        For Each activity As Activity In childActivities
            nestedActivities.Add(activity)
            If (activity Is compositeActivity) Then
                compositeActivities.Enqueue(activity)
            End If
        Next
    End While
    Return CType(nestedActivities.ToArray(GetType(Activity)), Activity())

End Function