Questions on UI for WPF Forum

4 answers

219 views

Filter on null Float values throwing exception

I have a data bound column on a float field. Some of the float values are null in the database. When I filter on the column when all values are not null, the filter works fine. When I filter on the column with null values included, I get an exception in Telerik code, "Nullable object must have a value." Here is the call stack when the exception is thrown:
:

Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableExtensions.Count(System.Linq.IQueryable source) Line 399 + 0x18b bytes C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.GetPagingDeterminativeItemCount() Line 413 + 0x86 bytes C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.PagingDeterminativeItemCount.get() Line 405 + 0x14 bytes C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.GetEffectiveItemCount() Line 388 + 0xa bytes C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.UpdateItemCount() Line 381 + 0x1e bytes C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.OnInternalListCreated() Line 783 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.EnsureInternalList() Line 643 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.InternalList.get() Line 632 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.InternalCount.get() Line 319 + 0x17 bytes C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.IsEmpty.get() Line 277 + 0x14 bytes C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.DataItemCollection.IsEmpty.get() Line 355 + 0x21 bytes C#
Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Controls.GridView.BaseItemsControl.OnItemCollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) Line 690 + 0x66 bytes C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.DataItemCollection.OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e) Line 636 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.DataItemCollection.OnCollectionViewCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e) Line 615 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.DataItemCollection.Telerik.Windows.Data.IWeakEventListener<System.Collections.Specialized.NotifyCollectionChangedEventArgs>.ReceiveWeakEvent(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) Line 1050 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.WeakEvent.WeakListener<System.Collections.Specialized.NotifyCollectionChangedEventArgs>.Handler(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs args) Line 33 + 0x69 bytes C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs args) Line 875 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.RefreshOverride() Line 1022 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.RefreshInternal() Line 970 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.RefreshOrDefer() Line 965 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.InvalidatePagingAndRefresh() Line 438 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.QueryableCollectionView.OnFilterDescriptorsCollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) Line 473 C#
[External Code]
Telerik.Windows.Data.dll!Telerik.Windows.Data.RadObservableCollection<Telerik.Windows.Data.IFilterDescriptor>.OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e) Line 149 + 0xf bytes C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.ObservableItemCollection<Telerik.Windows.Data.IFilterDescriptor>.OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e) Line 93 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.RadObservableCollection<Telerik.Windows.Data.IFilterDescriptor>.InsertItem(int index, Telerik.Windows.Data.IFilterDescriptor item) Line 196 C#
[External Code]
Telerik.Windows.Data.dll!Telerik.Windows.Data.CollectionHelper.Insert(System.Collections.IList target, System.Collections.IEnumerable newItems, int startingIndex, System.Collections.IEqualityComparer itemComparer) Line 334 + 0x44 bytes C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.ObservableCollectionManager.HandleCollectionChanged(System.Collections.IList sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs args) Line 106 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.ObservableCollectionManager.Telerik.Windows.Data.IWeakEventListener<System.Collections.Specialized.NotifyCollectionChangedEventArgs>.ReceiveWeakEvent(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs args) Line 87 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.WeakEvent.WeakListener<System.Collections.Specialized.NotifyCollectionChangedEventArgs>.Handler(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs args) Line 33 + 0x69 bytes C#
[External Code]
Telerik.Windows.Data.dll!Telerik.Windows.Data.RadObservableCollection<Telerik.Windows.Data.IFilterDescriptor>.OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e) Line 149 + 0xf bytes C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.ObservableItemCollection<Telerik.Windows.Data.IFilterDescriptor>.OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e) Line 93 C#
Telerik.Windows.Data.dll!Telerik.Windows.Data.RadObservableCollection<Telerik.Windows.Data.IFilterDescriptor>.InsertItem(int index, Telerik.Windows.Data.IFilterDescriptor item) Line 196 C#
Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Controls.GridView.FilteringViewModel.OnPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e) Line 551 + 0x3b bytes C#
Telerik.Windows.Controls.dll!Telerik.Windows.Controls.ViewModelBase.OnPropertyChanged(string propertyName) Line 58 C#
Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Controls.GridView.FilteringViewModel.ApplyFilters() Line 459 C#
Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Controls.GridView.FilteringViewModel.OnFieldFilterPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e) Line 386 C#
Telerik.Windows.Controls.dll!Telerik.Windows.Controls.ViewModelBase.OnPropertyChanged(string propertyName) Line 58 C#
Telerik.Windows.Controls.GridView.dll!Telerik.Windows.Controls.GridView.FilterDescriptorViewModel.Value.set(object value) Line 103 C#
[External Code]
Telerik.Windows.Controls.Input.dll!Telerik.Windows.Controls.RadMaskedTextBox.Value.set(object value) Line 376 C#
Telerik.Windows.Controls.Input.dll!Telerik.Windows.Controls.RadMaskedTextBox.UpdateValueFromHandler() Line 1444 C#
Telerik.Windows.Controls.Input.dll!Telerik.Windows.Controls.RadMaskedTextBox.TextBox_LostFocus() Line 877 + 0xd bytes C#
Telerik.Windows.Controls.Input.dll!Telerik.Windows.Controls.MaskedTextBox.ExtendedTextBox.OnLostFocus(System.Windows.RoutedEventArgs e) Line 53 C#
[External Code]

GridView

answered on 05 Mar 2012

4 answers

227 views

RadCalendar control not visible in design...

I am in the process of evaluating Telerik controls for WPF. I started by added a RadTabControl
to my main window (window1). I then set up 3 RadTabItems by using the collection editor
under the Items property of the RadTabControl. Dragging other controls from the toolbox
over to specific RadTabItems doesn't appear to work. I manually went into the XAML code
and inserted a calendar control on RadTabItem(2), and it shows up when running the
program, it does not show when in design mode however. I'm further confused by how
you would go about adding multiple controls to a RadTabItem. I am currently using
Visual Studio 2008 Version 9.0.21022.8 .Net Framework 3.5. Here is my current
XAML code. I'm wondering if someone could give me some pointers on what I'm
doing wrong ?

<Window x:Class="Window1"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="Window1" Height="300" Width="708" xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation">

<Grid>

<telerik:RadTabControl Margin="39,51,94,45" Name="RadTabControl1" TabOrientation="Vertical" TabStripPlacement="Left">

<telerik:RadTabItem AllowDrop="True" Header="Tab1" Name="RTI1"></telerik:RadTabItem>

<telerik:RadTabItem AllowDrop="True" Header="Tab2" Name="RTI2">

<telerik:RadCalendar Name="RadCalendar1" HorizontalAlignment="Left" Width="121" ClipToBounds="True" telerik:StyleManager.Theme="Metro"></telerik:RadCalendar>

</telerik:RadTabItem>

<telerik:RadTabItem AllowDrop="True" Header="Tab3" Name="RTI3"></telerik:RadTabItem>

</telerik:RadTabControl>

</Grid>

</Window>

TabControl

answered on 05 Mar 2012

9 answers

139 views

SelectColumn with group

How can I display checkbox on group header using SelectColumn?

I would like to select all rows within group with one checkbox.

GridView

answered on 05 Mar 2012

2 answers

216 views

Cannot Enter Edit Mode on Left Mouse Click

I am trying to emulate Windows general behavior for editing treeview nodes: clicking on an already selected node enters the editing mode.

With RadTreeView (WPF) I can handle the previewMouseDown events, as well as the left and right mouse button preview events of the treeview.

            AddHandler _TV.PreviewMouseDown, AddressOf tv_PreviewMouseDown

In the event handler i call begin edit (TV.SelectedContainer.BeginEdit() or myradTreeviewitem.BeginEdit).

        Private Sub tv_PreviewMouseDown(sender As Object, e As MouseButtonEventArgs) 
            Dim s = TryCast(e.OriginalSource, UIElement)             
            If s Is Nothing Then Exit Sub             
                Dim Item = UI.Library.FindVisualParent(Of Telerik.Windows.Controls.RadTreeViewItem)(s)
                If Item Is Nothing Then Exit Sub             
                If Item.IsSelected Then                 
                _TV.SelectedContainer.BeginEdit() 
                ' Item.BeginEdit
            End If         
        End Sub 

UI.Library.FindVisualParent is a small function that returns the parent of Type T of an element

This code works perfectly with a Righ Mouse click.
It does not work with a Left Mouse Click
In other words, BeginEdit does not work when called on a previewMouseDown if the left button triggered the event.

The PreviewMouseRightButtonDown works using the same handler.
The PreviewMouseLeftButtonDown works using the same handler.

Is there a reason why this is so. It is important for my application that I can keep windows interface conventions like clicking on the selected Tree Node enters editing mode.

Any help will be appreciated.

Thanks

TreeListView

answered on 05 Mar 2012

2 answers

179 views

Scatter Plots and Date Times

When I have a scatter point series where xvalue mapping is a date time and the chart's horizontal axis is a DateTimeContinuousAxis I get nothing plotted.

I can't imagine I'm the only one wanting to plot time series data without using the line series?

Is there a way to use the line series but not draw the lines, but draw the points?

ChartView

answered on 05 Mar 2012

7 answers

672 views

How to add a RadWindow in a WPF Window as a child control? How can I move child RadWindow in parent WPF Window?

Dear All,

I want to add RadWindow in WPF Window as a child control like following:

<

Window x:Class="MDIApplication.Window1"
xmlns=http://schemas.microsoft.com/winfx/2006/xaml/presentation

xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Navigation"

xmlns:x=http://schemas.microsoft.com/winfx/2006/xaml

Title="Window1" Height="300" Width="300">

<telerik:RadWindow Width="500" Height="300" BorderBackground="Yellow" BorderThickness="30" BorderBrush="Green" Visibility="Visible" />

</Canvas>

</

Window>

Now I want to move this child RadWindow inside the parent WPF Window, Just same as an MDI Child Window inside an MDI Parent Window.

Window

answered on 05 Mar 2012

1 answer

99 views

Creating a style does not generate resources

From this page: http://www.telerik.com/help/wpf/raddatetimepicker-styling-calendar.html

It says that if I generate a style, I should get those resources at the bottom (i.e. HeaderBackground). This never happens. I get a style, but I can't change the background of the header. Basically I do not want any of the colors that are defaulted. I just want to specify new colors overriding ALL that are there.

Has anyone else gotten that to work?

DateTimePicker

answered on 05 Mar 2012

1 answer

191 views

Remove date header

How can I get rid of the date header when grouping by resources in the day view?

See screen shot

ScheduleView

answered on 05 Mar 2012

1 answer

200 views

Show empty groups

Is it possible to show an empty group (group containing no items) in the GridView, f.i. by adding a group from code?

GridView

answered on 05 Mar 2012

2 answers

185 views

How to bind to SQL-Database

Hi,

I have a question about the binding to a SQL-Database

The Database-Table looks like this:

Column        value

id                    id
name              name of the node
parentid          id of the parentid (0=root)

how is the best way to fill a RadTreeView from this table with all its nodes?

Thank you for your help and sorry for my bad english

TreeView

answered on 05 Mar 2012