Nodes.Clear error after upgrading to 2011.3.11.1116

[Blas]

Hello,

I've upgraded today to version 2011.3.11.1116 and I'm experiencing a problem with treeview in existing projects.

I have this code to fill a treeview (for example, depending on the project choose by user):

Private Sub FillTree(Optional selPJerarquiaID As SqlHierarchyId = Nothing)
     treeEstructura.Enabled = False
     treeEstructura.DataSource = Nothing
     treeEstructura.Nodes.Clear()
     treeEstructura.DataSource = oProjects.Estructura.Items
     treeEstructura.Enabled = True
     treeEstructura.ExpandAll()

     If Not selPJerarquiaID.IsNull Then
         SelectNode(treeEstructura.Nodes(0).Nodes, selPJerarquiaID)
     Else
         treeEstructura.SelectedNode = treeEstructura.Nodes.First
     End If

 End Sub

The first time works fine. The user choose a project and the treeview shows all tasks assigned to this project. But it doesn't work for  second time and it crashed in the sentence treeEstructura.Nodes.Clear raising the next error:

"Object reference not set to an instance of an object"


If I ignored this clear sentence, the treeview is not rebound with the right content, and continues to show the content that belong to the first project.

Thank you in advance

[Marcus]

I can confirm this problem. I have it now in my project also.

[Marcus]

I have now (temporary) solved it by removing the nodes 1-by-1:

rtvTest.BeginEdit()
For ixIndex As Integer = rtvText.Nodes.Count - 1 To 0 Step -1
    Call rtvTest.Nodes(ixIndex).Remove()
Next
rtvTest.EndEdit()

[Blas]

Hello Marcus,

Thank you for your answer, but I doesn't work for me. I get the same error with remove.

[erwin]

I've also come across an error with TreeView.Nodes.Clear(). It hangs forever when used in lazy load/on-demand load scenarios.
Filed a bug report and sample project.
There seems to be something seriously wrong with RadTreeView in Q3.

BTW: Roberto, have you tried leaving out the Nodes.Clear() call. This should not be necessary since you change the datasource, the tree should reload properly. Nodes.Clear() should not need to be called for bound trees.

Regards
Erwin

[Blas]

Hello Erwin

Thank you for your answer.

The tree is bound to a List like this:

    Public Items As New List(Of cPlantillaEstructura)

Using Me.treeEstructura.DeferRefresh()

           treeEstructura.DataSource = Nothing

           Windows.Forms.Application.DoEvents()

 

          


           ' treeEstructura.Nodes.Clear()

          


           treeEstructura.DataSource = oPLANTILLAS.Estructura.Items

           treeEstructura.DisplayMember = "PEstructuraDesc"

           treeEstructura.ParentMember = "ParentID"

           treeEstructura.ChildMember = "PJerarquiaID"

           treeEstructura.ValueMember = "PEstructuraID"

            

           treeEstructura.Enabled = True

           treeEstructura.ExpandAll()

           treeEstructura.Refresh()

       End Using

In previous version of Telerik, it was requiered to clear nodes before binding the treeview. The treeview is not aware when the list is cleared.

And here is the class:

Public Class cPlantillaEstructura

    Implements INotifyPropertyChanged

    Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged

    Protected Sub OnPropertyChanged(ByVal name As String)

        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(name))

    End Sub

 

    Public Sub New()

        PEstructuraID = 0

        _PJerarquiaID = (New SqlHierarchyId).GetDescendant(Nothing, Nothing)

        PEstructuraDesc = "**CREANDO**"

        OnPropertyChanged("PJerarquiaID")

    End Sub

 

 

    Public Sub New(PEstructuraID As Integer, PJerarquiaID As SqlHierarchyId)

        PEstructuraID = PEstructuraID

        _PJerarquiaID = PJerarquiaID
        OnPropertyChanged("PJerarquiaID")

    End Sub

 

    Private _PEstructuraID As Integer

    Public Property PEstructuraID() As Integer

        Get

            Return _PEstructuraID

        End Get

        Set(value As Integer)

            _PEstructuraID = value

            OnPropertyChanged("PEstructuraID")

        End Set

    End Property

 

    Private _PEstructuraDesc As String

    Public Property PEstructuraDesc() As String

        Get

            Return _PEstructuraDesc

        End Get

        Set(value As String)

            _PEstructuraDesc = value

            OnPropertyChanged("PEstructuraDesc")

        End Set

    End Property

 

    Private _PTipoElemento As projectONE.clsPOdata.PlantillaTipoElemento

    Public Property PTipoElemento() As projectONE.clsPOdata.PlantillaTipoElemento

        Get

            Return _PTipoElemento

        End Get

        Set(value As projectONE.clsPOdata.PlantillaTipoElemento)

            _PTipoElemento = value

            OnPropertyChanged("PTipoElemento")

        End Set

    End Property

 

    Public ReadOnly Property IsNodo() As Boolean

        Get

            Return _PTipoElemento = clsPOdata.PlantillaTipoElemento.Nodo

        End Get

    End Property

 

    Public ReadOnly Property IsEtapa() As Boolean

        Get

            Return _PTipoElemento = clsPOdata.PlantillaTipoElemento.Etapa

        End Get

    End Property

 

    Public ReadOnly Property IsTarea() As Boolean

        Get

            Return _PTipoElemento = clsPOdata.PlantillaTipoElemento.Tarea

        End Get

    End Property

 

    Private _PJerarquiaID As SqlHierarchyId

    Public ReadOnly Property PJerarquiaID() As SqlHierarchyId

        Get

            Return _PJerarquiaID

        End Get

    End Property

 

    Public ReadOnly Property GetLevel() As Integer

        Get

            Return _PJerarquiaID.GetLevel()

        End Get

    End Property

 

    Public ReadOnly Property ParentID() As SqlHierarchyId

        Get

            Return _PJerarquiaID.GetAncestor(1)

        End Get

    End Property

 

    Private _Removed As Boolean

    Public Property Removed As Boolean

        Get

            Return _Removed

        End Get

        Set(value As Boolean)

            _Removed = value

        End Set

    End Property

 

 

End Class

Regards
Roberto

[Blas]

Solved with Nodes.Refresh

[Julian Benkov]

Hi guys,

We have been analyzing the issues with Nodes.Clear() and the rebinding operation and we believe that we managed to address them. The internal build that will contain the fix should be available by the end of the current week.

All the best,
Julian Benkov
the Telerik team

[Steve]

I'm still getting an error in the BreadCrumb when calling treeview.Nodes.Clear() if a tree node is selected.

[Dess | Tech Support Engineer, Principal]

Hello Steve,

Thank you for writing.  
 
Your question has already been answered in the other thread you have posted on the same topic. Please, see our answer there for more information.
We kindly ask you to use just one thread for a specific problem to contact us. Posting the same questions numerous times slows down our response time because we will need to review and address two or more tickets instead of one. Moreover, threads are handled according to license and time of posting, so if it is an urgent problem, we suggest you use a support ticket, which would be handled a forum thread.

Thank you for your understanding.

Regards,
Dess
Telerik by Progress