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Custom Control ITemplate Property Error

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Scheduler

This is a migrated thread and some comments may be shown as answers.

Eric asked on 09 Feb 2009, 10:10 PM

I have created a custom control which includes a RadScheduler as one of its child controls. I exposed the AdvancedEditTemplate and AdvancedInsertTemplate properties of the RadScheduler in my custom control as shown in the example below.

                                Imports Telerik.Web.UI         
                                 
                        Public NotInheritable Class CustomScheduler         
                          Inherits CompositeControl         
                                 
                          Private WithEvents mScheduler As RadScheduler         
                                 
                          <TemplateContainer(GetType(BTAppointmentScheduler)), _         
                            PersistenceMode(PersistenceMode.InnerProperty)> _         
                          Public Property AppointmentFormTemplate() As ITemplate         
                            Get         
                              EnsureChildControls()         
                              Return mScheduler.AdvancedEditTemplate         
                            End Get         
                            Set(ByVal value As ITemplate)         
                              EnsureChildControls()         
                              mScheduler.AdvancedEditTemplate = value         
                              mScheduler.AdvancedInsertTemplate = value         
                            End Set         
                          End Property         
                                 
                          Protected Overrides Sub CreateChildControls()         
                            Controls.Clear()         
                            mScheduler = New RadScheduler()         
                            Controls.Add(mScheduler)         
                          End Sub         
                                 
                          Protected Overrides Sub Render(ByVal writer As HtmlTextWriter)         
                            mScheduler.RenderControl(writer)         
                          End Sub         
                        End Class         

Then I setup my aspx page similiar to the example below.

                                <my:CustomScheduler ID="CustomScheduler1" runat="server">         
                          <AppointmentFormTemplate>         
                            <asp:TextBox ID="SubjectTextBox" runat="server" Rows="5" Columns="20" Text='<%# Bind("Subject") %>' Width="95%" TextMode="MultiLine"></asp:TextBox>         
                            ...         
                          </AppointmentFormTemplate>         
                        </my:CustomScheduler>         

Whenever, I try to create an appointment I get the following exception:

Unable to cast object of type 'System.Web.UI.CompiledTemplateBuilder' to type 'System.Web.UI.IBindableTemplate'.

atTelerik.Web.UI.RadScheduler.CreateFormContainer()
atTelerik.Web.UI.RadScheduler.CreateChildControls(BooleanbindFromDataSource)
atTelerik.Web.UI.RadScheduler.CreateChildControls()
atSystem.Web.UI.Control.EnsureChildControls()
atSystem.Web.UI.Control.PreRenderRecursiveInternal()
atSystem.Web.UI.Control.PreRenderRecursiveInternal()
atSystem.Web.UI.Control.PreRenderRecursiveInternal()
atSystem.Web.UI.Control.PreRenderRecursiveInternal()
atSystem.Web.UI.Control.PreRenderRecursiveInternal()
atSystem.Web.UI.Control.PreRenderRecursiveInternal()
atSystem.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint,Boolean includeStagesAfterAsyncPoint)

What am I doing wrong?

5 Answers, 1 is accepted

answered on 10 Feb 2009, 06:22 PM

That seems to have resolved the cast exception in RadScheduler.CreateFormContainer(). I am now getting the following cast exception during databinding.

Unable to cast object of type 'Telerik.Web.UI.SchedulerFormContainer' to type 'MyProject.CustomScheduler'.

at ASP.default_aspx.__DataBinding__control7(Object sender, EventArgs e) in C:\projects\MyProject\Default.aspx:line 36

at System.Web.UI.Control.OnDataBinding(EventArgs e)

at System.Web.UI.WebControls.CompositeControl.DataBind()

at System.Web.UI.Control.DataBindChildren()

at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)

at System.Web.UI.Control.DataBind()

at Telerik.Web.UI.RadScheduler.CreateChildControls(Boolean bindFromDataSource)

at Telerik.Web.UI.RadScheduler.CreateChildControls()

at System.Web.UI.Control.EnsureChildControls()

at System.Web.UI.Control.PreRenderRecursiveInternal()

at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)