Inheritance class data binding issue

[Thomas]

When I binding an iList contain base class,the grid show normal.
But when I binding an iList contain Inheritance class,the grid only show Inheritance class field/property,the base class field/property do not show.

[Hristo Deshev]

Hello Thomas,

RadGridView tries to infer the type of items in the collection it is bound to. The moment it sees an IList<Something> it deduces that Something is the item type, not checking if you actually have InheritedSomething objects inside.

This one is easy to fix -- turn your collection into a typed collection of the inherited type. LINQ makes that dead easy -- if you have an IList<Message>, you can transform it to an IEnumerable<InheritedMessage> using the Cast() extension method:

//will be treated as a collection of Message objects not including properties from InheritedMessage
//RadGridView1.ItemsSource = GetMessages();

//will be treated as a collection of InheritedMessage objects
RadGridView1.ItemsSource = GetMessages().Cast<InheritedMessage>();

I am attaching a sample project for your reference.

All the best,
Hristo Deshev
the Telerik team

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[imusic]

I found that not even having collections of inherited type will help with properties defined on base class.

Here is example:

Create C# Silverlight project RadGridInheritance

Add references to:

Telerik.Windows.Controls

Telerik.Windows.Controls.GridView

Telerik.Windows.Controls.Navigation

Add ContactSettings.cs:

using System;

using System.Collections.ObjectModel;

 

namespace RadGridInheritance

{

    public class ContactType

    {

        public string Description { get; set; }

    }

 

    public class AddressType:ContactType

    {

 

        public bool IsPostal { get; set; }

 

    }

 

    public class PhoneType

    {

        public string Description { get; set; }

    }

 

    public class ContactSettings

    {

        public ObservableCollection<ContactType> ContactTypes { get; set; }

        public ObservableCollection<AddressType> AddressTypes { get; set; }

        public ObservableCollection<PhoneType> PhoneTypes { get; set; }

 

    }

}

 

And page.xaml:

<UserControl x:Class="RadGridInheritance.Page"

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

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

    xmlns:telerikInput="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Input"

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

    xmlns:telerikGridView="clr-namespace:Telerik.Windows.Controls.GridView;assembly=Telerik.Windows.Controls.GridView"

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

    xmlns:telerik2="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls"            

    Width="400" Height="350">

    <Grid x:Name="LayoutRoot" Background="White">

        <Grid.RowDefinitions>

            <RowDefinition />

        </Grid.RowDefinitions>

        <telerikNavigation:RadTabControl Grid.Row="1">

            <telerikNavigation:RadTabControl.ItemsPanel>

                <ItemsPanelTemplate>

                    <telerik2:RadWrapPanel />

                </ItemsPanelTemplate>

            </telerikNavigation:RadTabControl.ItemsPanel>

            <telerikNavigation:RadTabItem Header="Address Types">

                <ScrollViewer VerticalScrollBarVisibility="Auto" BorderThickness="0">

                    <Grid>

                        <telerik:RadGridView

                            x:Name="AddressTypeGrid"

                            ItemsSource="{Binding AddressTypes}"

                            AutoGenerateColumns="False"

                            IsReadOnly="True"

                            Height="300"

                            ColumnsWidthMode="Auto"

                            ShowGroupPanel="False" >

                            <telerik:RadGridView.Columns>

                                <telerikGridView:GridViewDataColumn HeaderText="Description" UniqueName="Description" />

                                <telerikGridView:GridViewDataColumn HeaderText="IsPostal" UniqueName="IsPostal"  />

                            </telerik:RadGridView.Columns>

                        </telerik:RadGridView>

                    

                    </Grid>

                </ScrollViewer>

            </telerikNavigation:RadTabItem>

            <telerikNavigation:RadTabItem Header="Contact Types">

            <ScrollViewer VerticalScrollBarVisibility="Auto" BorderThickness="0">

                <Grid>

                    <telerik:RadGridView

                            x:Name="ContactTypeGrid"

                            ItemsSource="{Binding AddressTypes}"

                            AutoGenerateColumns="False"

                            Height="300"

                            IsReadOnly="True"

                            ColumnsWidthMode="Auto"

                            ShowGroupPanel="False" >

                        <telerik:RadGridView.Columns>

                            <telerikGridView:GridViewDataColumn HeaderText="Description" UniqueName="Description" />

                        </telerik:RadGridView.Columns>

                    </telerik:RadGridView>

 

                </Grid>

            </ScrollViewer>

        </telerikNavigation:RadTabItem>

            <telerikNavigation:RadTabItem Header="Phone Types">

                <ScrollViewer VerticalScrollBarVisibility="Auto" BorderThickness="0">

                    <Grid>

                        <telerik:RadGridView

                            x:Name="PhoneTypeGrid"

                            ItemsSource="{Binding PhoneTypes}"

                            AutoGenerateColumns="False"

                            Height="300"

                            IsReadOnly="True"

                            ColumnsWidthMode="Auto"

                            ShowGroupPanel="False" >

                            <telerik:RadGridView.Columns>

                                <telerikGridView:GridViewDataColumn HeaderText="Description" UniqueName="Description" />

                            </telerik:RadGridView.Columns>

                        </telerik:RadGridView>

 

                    </Grid>

                </ScrollViewer>

            </telerikNavigation:RadTabItem>

        </telerikNavigation:RadTabControl>

    </Grid>

</UserControl>

 

When you run the project you will notice that Description column on first 2 tabs displays no information.

 

[imusic]

Hristo,

example you have posted is WPF. When I run that code in Silverlight I get only Headers column.

As far as I can see issue is that grid can't be bound to properties defined in the base class as Thomas mentioned. This also affects column autogenaration.

[Hristo Deshev]

Hi imusic,

I've reproduced the bug. It appears on Silverlight only, and we will fix it for our next release. Thanks for reporting that! I have updated your Telerik points.

Best wishes,
Hristo Deshev
the Telerik team

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