dynamic Dock states always empty

[HL]

It has so many examples posted to save dynamic docks to DB and retrieve from DB. I couldn't figure out why the dock state are always empty when I added multi docks once. If I only add one dock per time, it works.

My situation is that all the user controls will be added to the docks together (once)  when user first goes to Dock widget page. Then user can drag, close, drop... etc  docks.User's dock state will save to DB after user click "Save" button. Before User click save button,  I saved the dockstate to the viewstate variable.The issue is that when I retrieve dockstate from the viewstate varible on ButtonSave_Click event, the viewstate variable is always nothing.


Can any one help me out?

Pls: it is the first time for me to post the question. not sure what is the best way to post codes since It took me 10 minutes to remove the extra empty space even I used the "Format Code Block". any suggestion?

My codes:

 

 

Private ReadOnly Property CurrentDockStates() As List(Of DockState)

Get

Dim dockStatesFromDB As String

if Not ViewState("UserDockStatesFromDB") Is Nothing AndAlso CType(ViewState("UserDockStatesFromDB"), String) <> String.Empty Then

dockStatesFromDB = CType(ViewState("UserDockStatesFromDB"), String)

End If

Dim _currentDockStates As New List(Of DockState)()

If dockStatesFromDB <> String.Empty Then

Dim stringStates As String() = dockStatesFromDB.Split("|")

For Each stringState As String In stringStates

If stringState.Trim() <> String.Empty Then

_currentDockStates.Add(DockState.Deserialize(stringState))

End If

Next

End If

Return _currentDockStates

End Get

End Property

Protected Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Init

If Not Page.IsPostBack Then

loadData()

ViewState("UserDockStatesFromDB") = GetUserDockState()

End If

'Recreate the docks in order to ensure their proper operation

Dim i As Integer = 0

While i < CurrentDockStates.Count

If CurrentDockStates(i).Closed = False Then

Dim dock As RadDock = CreateRadDockFromState(CurrentDockStates(i))

RadDockLayout1.Controls.Add(dock)

'We want to save the dock state every time a dock is moved.

CreateSaveStateTrigger(dock)

'Load the selected widget

LoadWidget(dock)

End If

System.Math.Max(System.Threading.Interlocked.Increment(i), i - 1)

End While

End Sub

Private Function GetUserDockState() As String Dim strUserDockStatesFromDB As String Dim ds As DataSet Dim intViewCategotyID As Integer = -1 Dim dr As DataRow Dim dt As DataTable Dim objBS As New BusinessServices.DockView objBS.SystemUserID = SystemUserID If Not Me.drpDockViewCategoty.SelectedItem Is Nothing Then intViewCategotyID = Me.drpDockViewCategoty.SelectedValue End If ds = objBS.GetSystemUserDockState(intViewCategotyID) CommonMethods.SetFormDataSet(GS.tblSystemUserDockState, FormData) If Not ds.Tables(GS.tblSystemUserDockState) Is Nothing Then dt = ds.Tables(GS.tblSystemUserDockState) If Not dt.Rows Is Nothing AndAlso dt.Rows.Count > 0 Then With ds.Tables(GS.tblSystemUserDockState).Rows(0) strUserDockStatesFromDB = .Item("DockState") CurUserDockStateID = GS.Null2Zero(.Item("SystemDockStateID")) CurViewCategoryID = GS.Null2Zero(.Item("DockViewCategoryID")) End With End If End If If strUserDockStatesFromDB = String.Empty Then 'reload all the default control CreateDefaultRadDock() End If Return strUserDockStatesFromDB End Function Private Sub loadData() 'load View Category End Sub Private Function CreateRadDockFromState(ByVal state As DockState) As RadDock Dim dock As New RadDock() dock.DockMode = DockMode.Docked dock.ID = String.Format("RadDock{0}", state.UniqueName) dock.ApplyState(state) dock.EnableAnimation = True dock.Commands.Add(New DockCloseCommand()) dock.Commands.Add(New DockExpandCollapseCommand()) Return dock End Function Private Function CreateRadDock(ByVal strTitle As String) As RadDock Dim docksCount As Integer = CurrentDockStates.Count Dim dock As New RadDock() dock.DockMode = DockMode.Docked dock.UniqueName = Guid.NewGuid().ToString() dock.ID = String.Format("RadDock{0}", dock.UniqueName) dock.Title = strTitle 'dock.EnableAnimation = True dock.Text =String.Format("Added at {0}", DateTime.Now) dock.Width = Unit.Pixel(100) dock.BorderWidth = Unit.Pixel(2) dock.BorderColor = Color.LightGray dock.Commands.Add(New DockCloseCommand()) dock.Commands.Add(New DockExpandCollapseCommand()) dock.CommandsAutoPostBack = True Return dock End Function 'when user first time load Dock layout, it will load all the control to three radzone Private Sub CreateDefaultRadDock() Dim index As Integer Dim DockList As New ArrayList() Dim intCount As Integer = 0 Dim intReminder As Integer Dim dock As RadDock If Not Me.chkDockList.Items Is Nothing Then intCount = Me.chkDockList.Items.Count End If For index = 0 To intCount - 1 dock = CreateRadDock(chkDockList.Items(index).Text) intReminder = index Mod 3 Select Case intReminder Case 0 RadDockZone1.Controls.Add(dock) Case 1 RadDockZone2.Controls.Add(dock) Case 2 RadDockZone3.Controls.Add(dock) End Select Me.chkDockList.Items(index).Selected = True 'We want to save the dock state every time a dock is moved. CreateSaveStateTrigger(dock) 'Load the selected widget dock.Tag = chkDockList.Items(index).Value LoadWidget(dock) Next index End Sub Private Sub CreateSaveStateTrigger(ByVal dock As RadDock) 'Ensure that the RadDock control will initiate postback ' when its position changes on the client or any of the commands is clicked. 'Using the trigger we will "ajaxify" that postback. dock.AutoPostBack = True dock.CommandsAutoPostBack = True Dim saveStateTrigger As New AsyncPostBackTrigger() saveStateTrigger.ControlID = dock.ID saveStateTrigger.EventName = "DockPositionChanged" UpdatePanel1.Triggers.Add(saveStateTrigger) saveStateTrigger = New AsyncPostBackTrigger() saveStateTrigger.ControlID = dock.ID saveStateTrigger.EventName = "Command" UpdatePanel1.Triggers.Add(saveStateTrigger) End Sub Private Sub LoadWidget(ByVal dock As RadDock) If String.IsNullOrEmpty(dock.Tag) Then Return End If Dim widget As Control = LoadControl(dock.Tag) dock.ContentContainer.Controls.Add(widget) End Sub Protected Sub RadDockLayout1_LoadDockLayout(ByVal sender As Object, ByVal e As DockLayoutEventArgs) Handles RadDockLayout1.LoadDockLayout Try Dim serializedList As String If Not ViewState("UserDockStatesFromDB") Is Nothing Then serializedList = ViewState( "UserDockStatesFromDB") End If If serializedList <> Nothing Then Dim states As String() = serializedList.Split("|"c) Dim i As Integer = 0 While i < states.Length Dim state As DockState = DockState.Deserialize(states(i)) e.Positions(state.UniqueName) = state.DockZoneID e.Indices(state.UniqueName) = state.Index System.Math.Max(System.Threading.Interlocked.Increment(i), i - 1) End While End If Catch ex As Exception End Try End Sub Protected Sub RadDockLayout1_SaveDockLayout(ByVal sender As Object, ByVal e As DockLayoutEventArgs) Handles RadDockLayout1.SaveDockLayout Dim stateList As List(Of DockState)=RadDockLayout1.GetRegisteredDocksState() Dim serializedList As New StringBuilder() Dim i As Integer = 0 While i < stateList.Count serializedList.Append(stateList(i).ToString()) serializedList.Append("|") System.Math.Max(System.Threading.Interlocked.Increment(i), i - 1) End While Dim dockState As String = serializedList.ToString() If dockState.Trim() <> String.Empty Then ViewState("UserDockStatesFromDB") = dockState End If End Sub '+-------------------------------------------------------------------------------'| Method : ButtonSave_Click '| Purpose : save all the state when user click Save button '| Returns : Boolean '+------------------------------------------------------------------------------- Protected Sub ButtonSave_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnSave.Click Dim dockState As String If Not ViewState("UserDockStatesFromDB") Is Nothing Then dockState = ViewState("UserDockStatesFromDB") End If If GetControlData(dockState) Then SaveUserDockState(FormData) End If End Sub Private Function GetUserDockState() As String

Dim strUserDockStatesFromDB As String

Dim ds As DataSet

Dim intViewCategotyID As Integer = -1

Dim dr As DataRow

Dim dt As DataTable

Dim objBS As New  BusinessServices.DockView

objBS.SystemUserID = SystemUserID

If Not Me.drpDockViewCategoty.SelectedItem Is Nothing Then

intViewCategotyID =

Me.drpDockViewCategoty.SelectedValue

End If

ds = objBS.GetSystemUserDockState(intViewCategotyID)

CommonMethods.SetFormDataSet(GS.tblSystemUserDockState, FormData)

If Not ds.Tables(GS.tblSystemUserDockState) Is Nothing Then

dt = ds.Tables(GS.tblSystemUserDockState)

If Not dt.Rows Is Nothing AndAlso dt.Rows.Count > 0 Then

With ds.Tables(GS.tblSystemUserDockState).Rows(0)

strUserDockStatesFromDB = .Item(

"DockState")

CurUserDockStateID = GS.Null2Zero(.Item(

"SystemDockStateID"))

CurViewCategoryID = GS.Null2Zero(.Item(

"DockViewCategoryID"))

End With

End If

End If

If strUserDockStatesFromDB = String.Empty Then

'reload all the default control

CreateDefaultRadDock()

End If

Return strUserDockStatesFromDB

End Function

Private Sub loadData()

'load View Category

End Sub

Private Function CreateRadDockFromState(ByVal state As DockState) As RadDock

Dim dock As New RadDock()

dock.DockMode = DockMode.Docked

dock.ID =

String.Format("RadDock{0}", state.UniqueName)

dock.ApplyState(state)

dock.EnableAnimation =

True

dock.Commands.Add(New DockCloseCommand())

dock.Commands.Add(

New DockExpandCollapseCommand())

Return dock

End Function

Private Function CreateRadDock(ByVal strTitle As String) As RadDock

Dim docksCount As Integer = CurrentDockStates.Count

Dim dock As New RadDock()

dock.DockMode = DockMode.Docked

dock.UniqueName = Guid.NewGuid().ToString()

dock.ID =

String.Format("RadDock{0}", dock.UniqueName)

dock.Title = strTitle

'dock.EnableAnimation = True

dock.Text =

String.Format("Added at {0}", DateTime.Now)

dock.Width = Unit.Pixel(100)

dock.BorderWidth = Unit.Pixel(2)

dock.BorderColor = Color.LightGray

dock.Commands.Add(

New DockCloseCommand())

dock.Commands.Add(

New DockExpandCollapseCommand())

dock.CommandsAutoPostBack = True

Return dock

End Function

'when user first time load Dock layout, it will load all the control to three radzone

Private Sub CreateDefaultRadDock()

Dim index As Integer

Dim DockList As New ArrayList()

Dim intCount As Integer = 0

Dim intReminder As Integer

Dim dock As RadDock

If Not Me.chkDockList.Items Is Nothing Then

intCount =

Me.chkDockList.Items.Count

End If

For index = 0 To intCount - 1

dock = CreateRadDock(chkDockList.Items(index).Text)

intReminder = index

Mod 3

Select Case intReminder

Case 0

RadDockZone1.Controls.Add(dock)

Case 1

RadDockZone2.Controls.Add(dock)

Case 2

RadDockZone3.Controls.Add(dock)

End Select

Me.chkDockList.Items(index).Selected = True

'We want to save the dock state every time a dock is moved.

CreateSaveStateTrigger(dock)

'Load the selected widget

dock.Tag = chkDockList.Items(index).Value

LoadWidget(dock)

Next index

End Sub

Private

Sub CreateSaveStateTrigger(ByVal dock As RadDock)

'Ensure that the RadDock control will initiate postback

' when its position changes on the client or any of the commands is clicked.

'Using the trigger we will "ajaxify" that postback.

dock.AutoPostBack =

True

dock.CommandsAutoPostBack =

True

Dim saveStateTrigger As New AsyncPostBackTrigger()

saveStateTrigger.ControlID = dock.ID

saveStateTrigger.EventName =

"DockPositionChanged"

UpdatePanel1.Triggers.Add(saveStateTrigger)

saveStateTrigger =

New AsyncPostBackTrigger()

saveStateTrigger.ControlID = dock.ID

saveStateTrigger.EventName =

"Command"

UpdatePanel1.Triggers.Add(saveStateTrigger)

End Sub

Private Sub LoadWidget(ByVal dock As RadDock)

If String.IsNullOrEmpty(dock.Tag) Then

Return

End If

Dim widget As Control = LoadControl(dock.Tag)

dock.ContentContainer.Controls.Add(widget)

End Sub

Protected Sub RadDockLayout1_LoadDockLayout(ByVal sender As Object, ByVal e As DockLayoutEventArgs) Handles RadDockLayout1.LoadDockLayout

Try

Dim serializedList As String

If Not ViewState("UserDockStatesFromDB") Is Nothing Then

serializedList = ViewState(

"UserDockStatesFromDB")

End If

If serializedList <> Nothing Then

Dim states As String() = serializedList.Split("|"c)

Dim i As Integer = 0

While i < states.Length

Dim state As DockState = DockState.Deserialize(states(i))

e.Positions(state.UniqueName) = state.DockZoneID

e.Indices(state.UniqueName) = state.Index

System.Math.Max(System.Threading.Interlocked.Increment(i), i - 1)

End While

End If

Catch ex As Exception

End Try

End Sub

Protected Sub RadDockLayout1_SaveDockLayout(ByVal sender As Object, ByVal e As DockLayoutEventArgs) Handles RadDockLayout1.SaveDockLayout

Dim stateList As List(Of DockState) = RadDockLayout1.GetRegisteredDocksState()

Dim serializedList As New StringBuilder()

Dim i As Integer = 0

While i < stateList.Count

serializedList.Append(stateList(i).ToString())

serializedList.Append(

"|")

System.Math.Max(System.Threading.Interlocked.Increment(i), i - 1)

End While

Dim dockState As String = serializedList.ToString()

If dockState.Trim() <> String.Empty Then

ViewState(

"UserDockStatesFromDB") = dockState

End If

End Sub

'+---------------------------------------------------------------------------------------------

'| Method : ButtonSave_Click

'| Purpose : save all the state when user click Save button

'| Returns : Boolean

'+---------------------------------------------------------------------------------------------

Protected Sub ButtonSave_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnSave.Click

Dim dockState As String

If Not ViewState("UserDockStatesFromDB") Is Nothing Then

dockState = ViewState(

"UserDockStatesFromDB")

End If

If GetControlData(dockState) Then

SaveUserDockState(FormData)

End If

End Sub

[Pero]

Hi HL,

The problem is caused by the fact that you are trying to use the ViewState object in the Page_Init event when the ViewState has not been loaded yet. The ViewState is loaded in the LoadViewState event which is fired on postback only after the Page_Init event: http://www.sql-server-performance.com/articles/asp_ado/page_life_cycle_p1.aspx. If you don't want to save the current DockStates on every postback in the DB, you should use the Session object which is available at any stage in the ASP.NET page lifecycle.


Greetings,
Pero
the Telerik team

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