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3 answers
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  <telerik:RadTreeListView.ChildTableDefinitions>
                <telerik:TreeListViewTableDefinition ItemsSource="{Binding Children}" />
            </telerik:RadTreeListView.ChildTableDefinitions>
            <telerik:RadTreeListView.Columns>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding Path=Item.Name}" Header="Name" SortMemberPath="Item.Name" DataType="{x:Type sys:String}"  />

            </telerik:RadTreeListView.Columns>

    public class Node
    { 
        public object Item { get; set; }

        //public WarehouseItem Item { get; set; } this line works fine

        public ObservableCollection<Node> Children { get; set; } = new ObservableCollection<Node>();
    }

 

If my Node.Item is object or dynamic type, sorting and filtering do not work, if it is a specific entity type like WarehouseItem they works fine.

The same thing happens to RadGridView.

Dilyan Traykov
Telerik team
 answered on 24 Feb 2021
11 answers
165 views

Hello,

I ran into a crash when updating the Docking.for.Xaml nuget to the latest stable 2021.1.119 version. This doesn't crash in the previous stable 2020.3.1020 version.

Steps to reproduce: create a .NET Core (did not try with .NET Framework because my actual program uses Core) WPF solution in Visual Studio, copy the PaneGroupExtensions class from https://github.com/telerik/xaml-sdk/blob/master/Docking/PaneGroupItemsSource/PaneGroupExtensions.cs and fix the namespace, and also around lines 48-55 don't bother with content or datacontext for the pane. The important thing just is to create a pane and added to the Group.Items collection. Add the Docking nuget package to the project. Then create a simple ViewModel class for your MainWindow with an collection property named "ForExtension" and set it as the DataContext for the MainWindow.

public class MainWindowViewModel {
    public List<string> ForExtension { get; set; } = new List<string>() { "Hello" };
}

 

Then add the following simple RadDocking inside your MainWindow.xamls Grid:

<telerik:RadDocking HasDocumentHost="False">
            <telerik:RadSplitContainer>
                <telerik:RadPaneGroup >
                    <telerik:RadPane Header="Pane" IsPinned="False" CanUserClose="False" CanFloat="False">
                        <Grid>
                        </Grid>
                    </telerik:RadPane>
                </telerik:RadPaneGroup>
                <telerik:RadPaneGroup local:PaneGroupExtensions.ItemsSource="{Binding ForExtension}" />
            </telerik:RadSplitContainer>
        </telerik:RadDocking>

 

 

When running this program under either version, it starts fine and displays the UI. When clicking on the pane in the left, the newer version of the nuget crashes the program with a System.NullReferenceException, with a call stack of 

Exception Info: System.NullReferenceException: Object reference not set to an instance of an object.
   at System.Windows.Automation.Peers.AutomationPeer.EnsureChildren()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateChildrenInternal(Int32 invalidateLimit)
   at System.Windows.Automation.Peers.ItemsControlAutomationPeer.UpdateChildren()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.ContextLayoutManager.fireAutomationEvents()
   at System.Windows.ContextLayoutManager.UpdateLayout()
   at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
   at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()
   at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
   at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
   at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
   at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location where exception was thrown ---
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(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, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   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()
   at RadGrid2021.App.Main()
Olivier
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 answered on 24 Feb 2021
3 answers
184 views

Hi

 

I tried the dark Fluent style for RadTreeView but it didn't work well.

where is the problem from?

Look at the pictures

Vicky
Telerik team
 answered on 24 Feb 2021
5 answers
274 views

Hi,

a simple question. 

I work with no-xaml dll's applying a theme choosed by user dinamically.

Now, I have simple forms with caption/control list.

When the control receive the focus I want apply to relatative caption (that is a textblock) a different foreground.

A good ipothesys is to apply current AccentHighBrush but I don't know the current theme.

Another idea is set a style in code-bihind for the textblock when control is focused and remove style wen focus lost.

But, wath style I can apply to textblock?

Other ideas?

marc.

 

Dilyan Traykov
Telerik team
 answered on 22 Feb 2021
4 answers
422 views
Hello !
I want to Edit Numeric Values with 2 digits in an GridView.

My First Solution:
Using an GridViewDataColumn and set the CellEditTemplate to a
RadMaskedNumericInput like this (SelectionOnFocus="SelectAll" (Important!))
<telerik:GridViewDataColumn Header="Listenpreis" Width="80" TextAlignment="Right" HeaderTextAlignment="Right"
                            DataMemberBinding="{Binding Path=Listenpreis}" DataFormatString="F2">
  <telerik:GridViewDataColumn.CellEditTemplate>
     <DataTemplate>
        <telerik:RadMaskedNumericInput Margin="0" SelectionOnFocus="SelectAll" HorizontalAlignment="Stretch"
               Value="{Binding Path=Listenpreis, Mode=TwoWay, ValidatesOnExceptions=true, NotifyOnValidationError=true, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}"
               SpinMode="None"
               FormatString="n2"/>
     </DataTemplate>
  </telerik:GridViewDataColumn.CellEditTemplate>
</telerik:GridViewDataColumn>
This works well for Editing, but the Enter Key doesn't work as expected to go to the next Row in the same Column.
I can Only change the Column with the Tab Key.

My Second Solution:
Using an GridViewMaskedInputColumn like this:
<telerik:GridViewMaskedInputColumn Header="Listenpreis3" Width="80" TextAlignment="Right" HeaderTextAlignment="Right"
                                   MaskType="Numeric"
                                   DataMemberBinding="{Binding Path=Listenpreis}" DataFormatString="{} {0:N2}"  />

But here i'am missing the 2 Digits Mask on Editing and "SelectAll" on Enter the Cell.

How can i get this working as expected ?
Peter
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Iron
Iron
Veteran
 answered on 22 Feb 2021
1 answer
233 views

Hello, i am regulary wondering if there is a recommended way to create a window is: create an usercontrol or create an instance in code-behind? 

The documention gives me the impression that the code-behind is the way to go and the usercontrol is just a work-around, but in most examples the usercontrol method is used.

Or it does not matter at all and one should use the method that fits best at the moment?

 

many greetings :-)

Martin Ivanov
Telerik team
 answered on 22 Feb 2021
2 answers
3.0K+ views

I have a few RadButton controls where I would like a different command to execute if the user "long presses" on the button.

For instance a single simple click would do 1 thing and a long click and hold then release would do something else.

How would I do that?

Datafyer
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Rank 1
Veteran
 answered on 18 Feb 2021
1 answer
87 views

Hello

If I update, build and run as usual, I get an error. (2020.3.1221.45 -> 2021.1.215.45)

 

 

 

System.Windows.Markup.XamlParseException'(PresentationFramework.dll)

Cannot find resource named 'CardView_DropDownButton_Foreground_Focused'. Resource names are case sensitive

 

I don't use CardvView. I just update and I get an error.

(My environment is NoXaml and Themes is Window7)

Use Reference : Telerik.Windows.Controls,  Telerik.Windows.Controls.Chart, Telerik.Windows.Controls.Data, Telerik.Windows.Controls.GridView,  Telerik.Windows.Controls.Input,  Telerik.Windows.Controls.Navigation, Telerik.Windows.Data,

Thnaks.

Vicky
Telerik team
 answered on 18 Feb 2021
2 answers
147 views

I have a gridview with a databound datetime column in it.

I can change its dataformatstring (or stringformat in binding) so that it shows the date in a short format (dd-mm-yyyy in dutch).

However, when those cells merge, it changes its format to include the time. This means I have a lot of cells that show something like '1-1-2021 00:00:00'.

How can I change that stringformat as well? I could only find a property called contentstringformat, which doesnt do anything.

 

mark
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 answered on 18 Feb 2021
6 answers
164 views

Hi,

I'm trying to migrate from RadScheduler to RadscheduleView and I am on version 2012.1.326.40 right now.

Since all my appointments are AllDayEvents, I need the week and day view to only show the AllDayArea and also the AllDayArea needs to have a vertical scrollbar.

I achieved this with the RadScheduler by using a custom theme, reflections-hacks, runtime manipulation of the visual tree and inheriting/reimplementing some AppointmentPanels.

How can I achieve this with RadScheduleView? I hope there is an easier way now.

Any help would be highly appreciated.

Best Regards
Steffen

Steffen
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 answered on 16 Feb 2021
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