以下是代码： VB： Imports System.Web.Script.Serialization
部分类MyLanding 继承System.Web.UI.Page Private LoginClass作为新的LoginClass Private _dockStateCleared As Boolean = False Private _conn As New SqlConnection（ConfigurationManager.ConnectionStrings（“MidwestPartsConnectionString”）。ConnectionString）
Private ReadOnly Property CurrentDockStates() As List(Of DockState)
Get
'Get saved state string from the database - set it to dockState variable for example
Dim dockStatesFromDB As String = ""
_conn.Open()
Dim command As New SqlCommand("SELECT JavascriptStr FROM SysProperties WHERE (UserID = @UserID)", _conn)
command.Parameters.Add("@UserID", SqlDbType.UniqueIdentifier).Value = Me.LoginClass.ReturnUserID()
Try
dockStatesFromDB = command.ExecuteScalar().ToString()
_conn.Close()
Catch ex As Exception
_conn.Close()
Me.CreateSavedLayout("")
End Try
Dim _currentDockStates As New List(Of DockState)()
Dim stringStates As String() = dockStatesFromDB.Split("|"c)
For Each stringState As String In stringStates
If stringState.Trim() <> String.Empty Then
_currentDockStates.Add(DockState.Deserialize(stringState))
End If
Next
Return _currentDockStates
End Get
End Property
Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender
If Not Page.IsPostBack Then
If CurrentDockStates.Count = 0 Then
Me.LoadItems()
End If
End If
End Sub
Protected Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Init
Dim i As Integer = 0
While i < CurrentDockStates.Count
If CurrentDockStates(i).Closed = False Then
Dim dock As RadDock = CreateRadDockFromState(CurrentDockStates(i))
dlColumnOne.Controls.Add(dock)
CreateSaveStateTrigger(dock)
LoadUserControl(dock)
End If
System.Math.Max(System.Threading.Interlocked.Increment(i), i - 1)
End While
End Sub
Protected Sub dlColumnOne_LoadDockLayout(ByVal sender As Object, ByVal e As DockLayoutEventArgs)
For Each state As DockState In CurrentDockStates
e.Positions(state.UniqueName) = state.DockZoneID
e.Indices(state.UniqueName) = state.Index
Next
End Sub
Protected Sub dlColumnOne_SaveDockLayout(ByVal sender As Object, ByVal e As DockLayoutEventArgs)
Dim stateList As List(Of DockState) = dlColumnOne.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
_conn.Open()
Dim command As New SqlCommand([String].Format("update sysproperties set javascriptstr = '{0}' Where UserID = @UserID ", dockState), _conn)
command.Parameters.Add("@UserID", SqlDbType.UniqueIdentifier).Value = Me.LoginClass.ReturnUserID()
command.ExecuteNonQuery()
_conn.Close()
End If
End Sub
Private Function CreateRadDockFromState(ByVal state As DockState) As RadDock
Dim dock As New RadDock()
dock.DockMode = DockMode.Docked
dock.UniqueName = state.UniqueName
dock.ID = String.Format("RadDock{0}", dock.UniqueName)
dock.ApplyState(state)
dock.Commands.Add(New DockCloseCommand())
dock.Commands.Add(New DockExpandCollapseCommand())
Return dock
End Function
Private Function CreateRadDock(ByVal DockTitle As String) As RadDock
Dim docksCount As Integer = CurrentDockStates.Count
Dim dock As New RadDock
dock.DockMode = DockMode.Docked
Dim UniqueName As String = Guid.NewGuid().ToString()
UniqueName = UniqueName.Replace("-", "")
dock.UniqueName = UniqueName
dock.ID = String.Format("RadDock{0}", UniqueName)
dock.Title = DockTitle
dock.Width = Unit.Pixel(400)
dock.Commands.Add(New DockCloseCommand())
dock.Commands.Add(New DockExpandCollapseCommand())
Return dock
End Function
Private Sub LoadItems()
Dim DocksDataTable As DataTable = Me.ReturnReports()
For i = 0 To DocksDataTable.Rows.Count() - 1
Dim dock As RadDock = Me.CreateRadDock(DocksDataTable.Rows(i).Item("ReportTitle").ToString())
Dim dz As RadDockZone = Me.dzColumnOne
Dim dl As RadDockLayout = Me.dlColumnOne
dz.Controls.Add(dock)
Me.CreateSaveStateTrigger(dock)
dock.Tag = DocksDataTable.Rows(i).Item("ReportPath")
Me.LoadUserControl(dock)
Next
End Sub
Public Function ReturnReports() As DataTable
Dim connection As New SqlConnection(ConfigurationManager.ConnectionStrings("MidwestPartsConnectionString").ConnectionString)
Dim Query As String = "SELECT Reports.ReportPath, Reports.ReportTitle, UserReports.UserID FROM UserReports INNER JOIN Reports ON UserReports.ReportID = Reports.ReportID WHERE (UserReports.UserID = @UserID)"
Dim adapter As New SqlDataAdapter
adapter.SelectCommand = New SqlCommand(Query, connection)
adapter.SelectCommand.Parameters.Add("@UserID", SqlDbType.UniqueIdentifier).Value = Me.LoginClass.ReturnUserID()
Dim table1 As New DataTable
connection.Open()
Try
adapter.Fill(table1)
Finally
connection.Close()
End Try
Return table1
End Function
Private Function ReturnLayout() As DataTable
Dim connection As New SqlConnection(ConfigurationManager.ConnectionStrings("MidwestPartsConnectionString").ConnectionString)
Dim Query As String = "select * from sysproperties"
Dim adapter As New SqlDataAdapter
adapter.SelectCommand = New SqlCommand(Query, connection)
adapter.SelectCommand.Parameters.Add("@UserPropertiesID", SqlDbType.Int).Value = 1
Dim table1 As New DataTable
connection.Open()
Try
adapter.Fill(table1)
Finally
connection.Close()
End Try
Return table1
End Function
Private Sub LoadUserControl(ByVal dock As RadDock)
If String.IsNullOrEmpty(dock.Tag) Then
Return
End If
Dim usercontrol As Control = LoadControl(dock.Tag)
dock.ContentContainer.Controls.Add(usercontrol)
End Sub
Private Sub CreateSaveStateTrigger(ByVal dock As RadDock)
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 CreateSavedLayout(ByVal JavascriptStr As String)
Dim sqlConn As New SqlConnection(ConfigurationManager.ConnectionStrings("MidwestPartsConnectionString").ConnectionString)
Dim strSqlInsert As String = "INSERT INTO SysProperties(UserID, JavascriptStr) VALUES (@UserID, @JavascriptStr)"
strSqlInsert += "; SELECT SCOPE_IDENTITY() ;"
Dim sqlCmd As New SqlCommand(strSqlInsert, sqlConn)
With sqlCmd.Parameters
.Add("@JavascriptStr", SqlDbType.Text).Value = JavascriptStr
.Add("@UserID", SqlDbType.UniqueIdentifier).Value = Me.LoginClass.ReturnUserID()
End With
sqlCmd.Connection.Open()
sqlCmd.ExecuteScalar()
sqlCmd.Connection.Close()
End Sub
Protected Sub btnAddReports_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnAddReports.Click
Try
Response.Redirect("~/MyUserAccount/SelectedReports.aspx", False)
Catch ex As Exception
End Try
End Sub
结束班
答案 0 :(得分：0)
你看起来很好。此问题的可能原因包括：
快速拖动Dock控件会导致ajax冲突，并显示错误。为避免这种情况发生，您可以在ajax请求过程中显示AjaxLoading面板（在telerik论坛中搜索/询问示例，了解如何执行此操作）。此外，您应确保您网站上的UpdatePanel配置如以下在线演示：http://demos.telerik.com/aspnet-ajax/dock/examples/myportal/defaultcs.aspx。
该错误是ViewState问题的结果。这个telerik论坛主题提供了一个可能的解决方案：www.telerik.com/community/forums/aspnet-ajax/docking/failed-to-load-view-state-error-when-moving-dynamically-created-widgets-around-the -raddocklayout.aspx