Questions on UI for WPF Forum

4 answers

807 views

Check for duplicates in RadGridView rows

We have a RadGridView with 2 columns.
When we edit a cell or when we are adding a new row, we want to loop through the rows cell[1] to check for duplicates.
We want to do this in...

private void TheGridCellValidating(object sender, GridViewCellValidatingEventArgs e).

We try things like this...

            var grid = (e.Row).GridViewDataControl;
            string value = e.NewValue.ToString();

            var rows = grid.ChildrenOfType<GridViewRow>();

            foreach (var row in rows)
            {
                if (row == null) continue;
                if (row.Cells == null) continue;
                if (row.Cells[1] != null)
                {
                    var s = row.Cells[0]......
                    ...
                    ....
                }
            }
But... it won't work.
How can we iterate on the rows and check for duplicates?

GridView

answered on 12 Jul 2010

1 answer

100 views

Crash when binding InformationLayer to a string collection

Say I have a DataContext with:

ObservableCollection<Toto> m_files = new ObservableCollection<Toto>();

public ObservableCollection<Toto> Filenames

{

get

{

return m_files;

}

For some reason, this code:

<map:InformationLayer ItemsSource="{Binding Filenames}">

<map:InformationLayer.ItemTemplate>

<DataTemplate>

<Canvas map:MapLayer.Location="5, 5" Width="100" Height="100" Background="AliceBlue">

<TextBlock Text="{Binding}"/>

</Canvas>

</DataTemplate>

</map:InformationLayer.ItemTemplate>

</map:InformationLayer>

crashes with this exception:

System.FormatException was unhandled

Message=Input string was not in a correct format.

Source=Telerik.Windows.Controls.DataVisualization

StackTrace:

at Telerik.Windows.Controls.Map.Location.Parse(String source) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q1_SP2\Sources\Development\Controls\DataVisualization\Map\Location.cs:line 200

at Telerik.Windows.Controls.Map.LocationConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q1_SP2\Sources\Development\Controls\DataVisualization\Map\LocationConverter.cs:line 40

at System.ComponentModel.TypeConverter.ConvertFrom(Object value)

at Telerik.Windows.Controls.Map.InformationLayer.GetLocationFromItem(Object item) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q1_SP2\Sources\Development\Controls\DataVisualization\Map\Layers\InformationLayer.cs:line 1214

at Telerik.Windows.Controls.Map.InformationLayer.PrepareContainerForItemOverride(DependencyObject element, Object item) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q1_SP2\Sources\Development\Controls\DataVisualization\Map\Layers\InformationLayer.cs:line 449

at System.Windows.Controls.ItemsControl.MS.Internal.Controls.IGeneratorHost.PrepareItemContainer(DependencyObject container, Object item)

at System.Windows.Controls.ItemContainerGenerator.System.Windows.Controls.Primitives.IItemContainerGenerator.PrepareItemContainer(DependencyObject container)

at System.Windows.Controls.Panel.reGenerateChildren()

at System.Windows.Controls.Panel.OnItemsChangedInternal(Object sender, ItemsChangedEventArgs args)

at System.Windows.Controls.Panel.OnItemsChanged(Object sender, ItemsChangedEventArgs args)

at System.Windows.Controls.ItemContainerGenerator.OnRefresh()

at System.Windows.Controls.ItemContainerGenerator.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)

at System.Windows.Controls.ItemContainerGenerator.System.Windows.IWeakEventListener.ReceiveWeakEvent(Type managerType, Object sender, EventArgs e)

at System.Windows.WeakEventManager.DeliverEventToList(Object sender, EventArgs args, ListenerList list)

at System.Windows.WeakEventManager.DeliverEvent(Object sender, EventArgs args)

at System.Collections.Specialized.CollectionChangedEventManager.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)

at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)

at System.Windows.Data.CollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)

at System.Windows.Controls.ItemCollection.System.Windows.IWeakEventListener.ReceiveWeakEvent(Type managerType, Object sender, EventArgs e)

at System.Windows.WeakEventManager.DeliverEventToList(Object sender, EventArgs args, ListenerList list)

at System.Windows.WeakEventManager.DeliverEvent(Object sender, EventArgs args)

at System.Collections.Specialized.CollectionChangedEventManager.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)

at System.Windows.Data.CollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)

at System.Windows.Data.ListCollectionView.RefreshOverride()

at System.Windows.Data.CollectionView.RefreshInternal()

at System.Windows.Data.CollectionView.Refresh()

at System.Windows.Data.CollectionView.EndDefer()

at System.Windows.Data.CollectionView.DeferHelper.Dispose()

at System.Windows.Controls.ItemCollection.SetCollectionView(CollectionView view)

at System.Windows.Controls.ItemCollection.SetItemsSource(IEnumerable value)

at System.Windows.Controls.ItemsControl.OnItemsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)

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.InvalidateProperty(DependencyProperty dp)

at System.Windows.Data.BindingExpression.Invalidate(Boolean isASubPropertyChange)

at System.Windows.Data.BindingExpression.TransferValue(Object newValue, Boolean isASubPropertyChange)

at System.Windows.Data.BindingExpression.Activate(Object item)

at System.Windows.Data.BindingExpression.AttachToContext(AttachAttempt attempt)

at System.Windows.Data.BindingExpression.MS.Internal.Data.IDataBindEngineClient.AttachToContext(Boolean lastChance)

at MS.Internal.Data.DataBindEngine.Task.Run(Boolean lastChance)

at MS.Internal.Data.DataBindEngine.Run(Object arg)

at MS.Internal.Data.DataBindEngine.OnLayoutUpdated(Object sender, EventArgs e)

at System.Windows.ContextLayoutManager.fireLayoutUpdateEvent()

at System.Windows.ContextLayoutManager.UpdateLayout()

at System.Windows.UIElement.UpdateLayout()

at System.Windows.Interop.HwndSource.SetLayoutSize()

at System.Windows.Interop.HwndSource.set_RootVisualInternal(Visual value)

at System.Windows.Interop.HwndSource.set_RootVisual(Visual value)

at System.Windows.Window.SetRootVisual()

at System.Windows.Window.SetupInitialState(Double requestedTop, Double requestedLeft, Double requestedWidth, Double requestedHeight)

at System.Windows.Window.CreateSourceWindowImpl()

at System.Windows.Window.SafeCreateWindow()

at System.Windows.Window.ShowHelper(Object booleanBox)

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.DispatcherOperation.InvokeImpl()

at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)

at System.Threading.ExecutionContext.runTryCode(Object userData)

at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)

at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)

at System.Threading.ExecutionContext.Run(ExecutionContext 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, 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 WpfApplication1.App.Main() in C:\Users\frederic.souchu\documents\visual studio 2010\Projects\WpfMap\WpfApplication1\obj\x86\Release\App.g.cs:line 0

at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)

at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)

at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()

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: System.FormatException

Message=Input string was not in a correct format.

Source=Telerik.Windows.Controls.DataVisualization

StackTrace:

at Telerik.Windows.Controls.Map.Location.Parse(String source) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q1_SP2\Sources\Development\Controls\DataVisualization\Map\Location.cs:line 185

InnerException:

Note that replacing the <string> element by any sort of class just works fine!
Regards
Frederic

Map

answered on 12 Jul 2010

1 answer

199 views

How to remove the drop-down button

Is it possible to hide the drop-down button from the RadTimePicker?

TimePicker

answered on 12 Jul 2010

4 answers

138 views

Styling a CarouselItem makes Carousel Disappear

I'm new to WPF and to the Carousel as well, but taking what little examples there are for this control just isn't working for me. Even taking the exact code from your documentation and applying it makes my Carousel disappear.

When trying to view the Style in Expression Blend 4, I get an error "Property values set when no trigger is active".

The code I have is very simple:

                    	<telerik:RadCarousel x:Name="carousel">         
                        <Image Source="Images/Puck/1.jpg" Width="200" Height="200" Stretch="Fill" />         
                        <Image Source="Images/Puck/4.jpg" Width="200" Height="200" Stretch="Fill" />         
                        <Image Source="Images/Puck/5.jpg" Width="200" Height="200" Stretch="Fill" />         
                        <Image Source="Images/Puck/6.jpg" Width="200" Height="200" Stretch="Fill" />         
                        <Image Source="Images/Puck/7.jpg" Width="200" Height="200" Stretch="Fill" />         
                        <Image Source="Images/Puck/9.jpg" Width="200" Height="200" Stretch="Fill" />         
                        <Image Source="Images/Puck/10.jpg" Width="200" Height="200" Stretch="Fill" />         
                        <Image Source="Images/Puck/11.jpg" Width="200" Height="200" Stretch="Fill" />         
                    </telerik:RadCarousel>         
                    <Grid.Resources>         
                        <Style TargetType="{x:Type telerik:CarouselItem}">         
                            <Setter Property="Template">         
                                <Setter.Value>         
                                    <ControlTemplate TargetType="{x:Type telerik:CarouselItem}">         
                                        <Border x:Name="border">         
                                            <VisualStateManager.VisualStateGroups>         
                                                <VisualStateGroup x:Name="ValidationStates">         
                                                    <VisualState x:Name="Valid"/>         
                                                    <VisualState x:Name="InvalidFocused"/>         
                                                    <VisualState x:Name="InvalidUnfocused"/>         
                                                </VisualStateGroup>         
                                            </VisualStateManager.VisualStateGroups>         
                                            <Border x:Name="CarouselItemMainBorder"         
                                                ClipToBounds="False" RenderTransformOrigin="0.5, 1"         
                                                Opacity="{Binding ReflectionSettings.Opacity, RelativeSource={RelativeSource TemplatedParent}}"         
                                                Visibility="{Binding ReflectionSettings.Visibility, RelativeSource={RelativeSource TemplatedParent}}"         
                                                BorderBrush="{x:Null}" BorderThickness="1,1,1,1" CornerRadius="0" SnapsToDevicePixels="True" Margin="0,0,-10,-35" MouseEnter="MouseEnterTest">         
                                                <Border.Background>         
                                                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">         
                                                        <GradientStop Color="#FFC1DCFF" Offset="0"/>         
                                                        <GradientStop Color="#FF7EB8F8" Offset="1"/>         
                                                    </LinearGradientBrush>         
                                                </Border.Background>         
                                            </Border>         
                                        </Border>         
                                    </ControlTemplate>         
                                </Setter.Value>         
                            </Setter>         
                        </Style>         
                    </Grid.Resources>         

Carousel

answered on 10 Jul 2010

5 answers

276 views

Tab Control Itemssource

I followed this link http://www.telerik.com/help/wpf/radtabcontrol-populating-binding-to-collection.html to bind a collection to my tab control. The content is displaying properly but the header is not. My header is still displaying "MiddleLayer.SalesPerson" even though I assigned "Name" to DisplayMemberpath. My code is as below

    <UserControl.Resources>
        <DataTemplate x:Key="salesTemplate">
            <ctrls:AccountSalesPersonUserControl DataContext="{Binding}"></ctrls:AccountSalesPersonUserControl>
        </DataTemplate>
    </UserControl.Resources>

<telerikPresent:RadTabControl x:Name="SalesPersonTab" ItemsSource="{Binding Path=SelectedItem.SalesPersons, Mode=OneWay}"
                   DisplayMemberPath="Name" ContentTemplate="{StaticResource salesTemplate}" />

TabControl

answered on 10 Jul 2010

2 answers

421 views

SelectionChanged Event - Get Last Selected RadTabItem

Hello All,

We are in the process of converting the plain old WPF TabControl with the RadTabControl. We have a need to get the last tab that was selected before the user clicked a new tab.

Using the WPF TabControl, in the EventArgs, there was an AddedItems and RemovedItems property. In the RadTabControl, these do not exist.

Is there a way to get the user's last selected TabItem using this handler?

Thanks,
Chris

TabControl

answered on 09 Jul 2010

7 answers

244 views

How to: Retrieve value of cell in selected row

Hello everybody

After doing researches in all available source I still can not accomplish this probably trivial task. I would like to read the values of various cells of the row which is selected. The sample I found in this forum deals with a business object (Person). I'd expected something like:

myValue = gridview.selectedRow.Columns("NameOfThisColumn")

Thanks for your help in advance

Michael Lutz
BITsoft

GridView

answered on 09 Jul 2010

7 answers

215 views

Custom Grouping by Range

Hello Everybody

I would like to be able to create custom groupings that allow users to group by a range of values rather than by a specific value of a particular member. For example, if there is a "severity" column that has integer values from 0-199, I'd like to be able to create 2 groups of severity 0-99 and 100-199 instead of the default of 200 groups, one for severity 1, one for severity 2, etc.

I've hunted through the docs and it looks like I may be able to extend from Telerik.Windows.Data.GroupDescriptor to achieve my goal, but the documentation on the subject is not very helpful. Can anyone explain how the GroupDescriptor class creates a grouping, or even better, provide code examples of how its done?

Thanks,
Tom

GridView

answered on 09 Jul 2010

3 answers

617 views

Getting the Location Under the Cursor

Hello,

How can I get the location (latitude and longitude coordinates) for the point beneath the mouse cursor?

Thank you.

Map

answered on 09 Jul 2010

3 answers

119 views

No method 'Average' on type 'System.Linq.Enumerable' is compatible with the supplied arguments.

Hi,

I'm testing out this library and I'm getting the following error:
No method 'Average' on type 'System.Linq.Enumerable' is compatible with the supplied arguments.

I'm doing a very simple test. Here is the relevant code:

    
            public class Data     
        
            {     
        
                public UInt32 XValue { get; set; }     
        
                public double YValue { get; set; }     
        
            }     
        
            List<Data> m_Data; // This is initialized with data.     
        
            // Then, when setting up the chart...     
        
            SeriesMapping seriesMapping = new SeriesMapping();     
        
            LineSeriesDefinition lineDefinition = new LineSeriesDefinition();     
        
            lineDefinition.ShowItemLabels = false;     
        
            seriesMapping.SeriesDefinition = lineDefinition;     
        
            seriesMapping.ItemMappings.Add(new ItemMapping("XValue", DataPointMember.XValue));  
        
            seriesMapping.ItemMappings.Add(new ItemMapping("YValue", DataPointMember.YValue));     
        
            MyChart.SeriesMappings.Add(seriesMapping);     
        
            // Then I set my data     
        
            MyChart.ItemSource = m_Data;

When m_Data has more then 397 elements it throws that error. Before that number it looks pretty.

Any help will be greatly appreciated.
- Luis

Chart

answered on 09 Jul 2010