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

Problems databinding

6 Answers 483 Views

TreeView

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

MrHinsh [MVP] asked on 25 Jul 2008, 11:01 AM

Hi, I am having a little problem with databinding against the Treeview in WPF.

This is my data template

    
             <DataTemplate x:Key="TreeParameterDataTemplate" DataType="TreeParameter">  
        
                        <StackPanel>                  
        
                            <Telerik:RadTreeView  
        
                             VerticalAlignment="Top" 
        
                             HorizontalAlignment="Left" 
        
                             MinHeight="100" 
        
                             x:Name="myTreeview" 
        
                             Margin="0, 0, 20, 0" 
        
                             SelectionMode="Single" 
        
                             SelectedValuePath="{Binding Path=ParameterValue, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" 
        
                             ItemsSource="{Binding Path=Nodes, Mode=Default}" 
        
                             ItemTemplate="{DynamicResource ValidValueNodeDataTemplate}" 
        
                             IsTriStateMode="True" 
        
                             IsOptionElementsEnabled="True" 
        
                             ItemsOptionListType="CheckList">  
        
                        </Telerik:RadTreeView> 
        
                            <!--<ListBox ItemTemplate="{DynamicResource ValidValueNodeDataTemplate}"  ItemsSource="{Binding Path=Nodes, Mode=Default}" />--> 
        
                        </StackPanel> 
        
                </DataTemplate>

It seams to be the SelectedValuePath that is causing the problem. It should be a string, and ParameterValue is a string, but I get the following error:

    
            System.InvalidOperationException was unhandled  
        
              Message="Syntax error in PropertyPath 'Syntax error in Binding.Path '[Business Hierarchy].[Power Pack Hierarchy].[Power Pack Description].&[Aggreko International]' ... '&[Chile]&[1]'.'." 
        
              Source="PresentationFramework" 
        
              StackTrace:  
        
                   at System.Windows.PropertyPath.PrepareSourceValueInfo(ITypeDescriptorContext typeDescriptorContext)  
        
                   at System.Windows.PropertyPath..ctor(String path, Object[] pathParameters)  
        
                   at Telerik.Windows.Controls.RadTreeView.GetSelectedValuePathBinding()  
        
                   at Telerik.Windows.Controls.RadTreeView.UpdateSelectedValue()  
        
                   at Telerik.Windows.Controls.RadTreeView.SelectionChanger_SelectionChanged(Object sender, SelectionChangedEventArgs e)  
        
                   at Telerik.Windows.Controls.SelectionChanger`1.InvokeSelectionChangedEvent()  
        
                   at Telerik.Windows.Controls.SelectionChanger`1.End()  
        
                   at Telerik.Windows.Controls.SelectionChanger`1.InsertItem(Int32 index, T item)  
        
                   at System.Collections.ObjectModel.Collection`1.Add(T item)  
        
                   at Telerik.Windows.Controls.RadTreeViewItem.OnIsSelectedPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs args)  
        
                   at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)  
        
                   at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)  
        
                   at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)  
        
                   at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, OperationType operationType)  
        
                   at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, OperationType operationType, Boolean isInternal)  
        
                   at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)  
        
                   at Telerik.Windows.Controls.RadTreeViewItem.set_IsSelected(Boolean value)  
        
                   at Telerik.Windows.Controls.RadTreeView.SetSelectedItem(RadTreeViewItem itemContainer)  
        
                   at Telerik.Windows.Controls.RadTreeView.HandleItemSelectionFromUI(RadTreeViewItem itemUnderCursor)  
        
                   at Telerik.Windows.Controls.RadTreeViewItem.OnHeaderMouseLeftButtonDown(Object sender, MouseButtonEventArgs e)  
        
                   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)  
        
                   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)  
        
                   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)  
        
                   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)  
        
                   at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)  
        
                   at System.Windows.UIElement.CrackMouseButtonEventAndReRaiseEvent(DependencyObject sender, MouseButtonEventArgs e)  
        
                   at System.Windows.UIElement.OnMouseDownThunk(Object sender, MouseButtonEventArgs e)  
        
                   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)  
        
                   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)  
        
                   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)  
        
                   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)  
        
                   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)  
        
                   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)  
        
                   at System.Windows.Input.InputManager.ProcessStagingArea()  
        
                   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)  
        
                   at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)  
        
                   at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)  
        
                   at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)  
        
                   at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)  
        
                   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)  
        
                   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)  
        
                   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)  
        
                   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)  
        
                   at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)  
        
                   at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Boolean isSingleParameter)  
        
                   at System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)  
        
                   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)  
        
                   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)  
        
                   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)  
        
                   at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)  
        
                   at System.Windows.Threading.Dispatcher.Run()  
        
                   at System.Windows.Application.RunDispatcher(Object ignore)  
        
                   at System.Windows.Application.RunInternal(Window window)  
        
                   at System.Windows.Application.Run(Window window)  
        
                   at System.Windows.Application.Run()  
        
                   at Aggreko.ABI.ABIReportViewer.Application.Main() in C:\Working\Workspaces\ATFS01\Sirius\DEV\R699\Aggreko.ABI.ABIReportViewer\obj\Debug\Application.g.vb:line 73  
        
                   at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)  
        
                   at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)  
        
                   at System.Runtime.Hosting.ManifestRunner.Run(Boolean checkAptModel)  
        
                   at System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly()  
        
                   at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext, String[] activationCustomData)  
        
                   at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext)  
        
                   at System.Activator.CreateInstance(ActivationContext activationContext)  
        
                   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone()  
        
                   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)  
        
                   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)  
        
                   at System.Threading.ThreadHelper.ThreadStart()  
        
              InnerException:

Help...

6 Answers, 1 is accepted

answered on 25 Jul 2008, 01:43 PM

Hi, Yes the problem occurs even using the the MS treeview!

:(

However the code is the same for other bits, like:

    
            <DataTemplate x:Key="DateTimeParameterDataTemplate">  
        
                    <StackPanel> 
        
                        <Telerik:RadCalendar SelectedDate="{Binding Path=ParameterValue, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" /> 
        
                    </StackPanel> 
        
                </DataTemplate>

Which work just fine....

I thought that the SelectedValuePath parameter was a string?

answered on 25 Jul 2008, 03:02 PM

Hi Valentin,

That does not help me :(

I am trying to bind the SelectedValuePath to a string value of an object!

The object that I bind to the TreeView has both a property called "Nodes" that contains the herarchical items, and a property called "ParameterValue" that will contain the selected ietm. This is a string property and I have many other controls binding to it with no problems with other types of data.

Why can't I pull the string value of SelectedValuePath and bind it to a string property on an object?

Would it matter that my data has some funny charicters in it? e.g. "[Business Hierarchy].[Business Hierarchy].[Region].&[EUROPE]"

Martin

answered on 25 Jul 2008, 03:19 PM

Hi,

I have been able to output the SelectedValue to a text area, but I do not see how to get the current selected item and set the current selected item into my data object.

Here is the portion of my ResourceDictionary:

    
             <DataTemplate x:Key="TreeParameterDataTemplate" DataType="TreeParameter">  
        
                        <StackPanel> 
        
                        <TreeView ItemsSource="{Binding Path=Nodes, Mode=Default}" ItemTemplate="{DynamicResource ValidValueNodeDataTemplate}">  
        
                       </TreeView> 
        
                         <Telerik:RadTreeView  
        
                             VerticalAlignment="Top" 
        
                             HorizontalAlignment="Left" 
        
                             MinHeight="100" 
        
                             x:Name="myTreeview" 
        
                             Margin="0, 0, 20, 0" 
        
                             SelectionMode="Single" 
        
                             SelectedValuePath="ValidValue.Value"   
        
                             ItemsSource="{Binding Path=Nodes, Mode=Default}" 
        
                             ItemTemplate="{DynamicResource ValidValueNodeDataTemplate}" 
        
                             IsTriStateMode="True" 
        
                             IsOptionElementsEnabled="True" 
        
                             ItemsOptionListType="CheckList">  
        
                        </Telerik:RadTreeView> 
        
                        <TextBlock Margin="10,0,0,0" Text="{Binding ElementName=myTreeView, Path=SelectedValuePath}" 
        
                       Foreground="Blue"/>  
        
                        <TextBlock Margin="10">SelectedValue:</TextBlock> 
        
                        <TextBlock Margin="10,0,0,0"   
        
                       Text="{Binding ElementName=myTreeView,   
        
                                      Path=SelectedValue}"  
        
                       Foreground="Blue"/>  
        
                        <!--<ListBox ItemTemplate="{DynamicResource ValidValueNodeDataTemplate}"  ItemsSource="{Binding Path=Nodes, Mode=Default}" />--> 
        
                        </StackPanel> 
        
                </DataTemplate>

This displayes the result on the screen, but I need to add a binding from the selected value to my object...