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Combobox Column

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GridView

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answered on 13 Oct 2009, 01:01 PM

Here is what I am currently doing in my completed event which of course is not working.

                            Dim ms As New System.IO.MemoryStream(e.Result)         
                    Dim listDS As New C1.Silverlight.Data.DataSet         
                    listDS.ReadXml(ms)         
                     
                    Dim column As GridViewDataColumn = CType(editGrid.Columns(e.UserState.ToString), GridViewDataColumn)         
                    Dim combo As RadComboBox = CType(column.CellEditTemplate.LoadContent, RadComboBox)         
                    combo.ItemsSource = listDS.Tables(0).DefaultView         
                     

If I have a regular combobox column and then bind this dataset to the column's itemsource everything works fine. I know the loadcontent is not getting me the correct reference to the combobox and that seems to be all that am I missing to get this to work.

answered on 15 Oct 2009, 12:37 PM

multicolumncombo-sl.zip

Hello Scott ,

I believe the following approach may suit to your scenario:

1. Override the default CellEditTemplate of the ComboBoxColumn
2. Place a user control inside with a combobox styled for multi column appearance.
3.In the code-behind of the user control set the properties of the combo to the relevant properties of the column
4. Place any additional logic to control the combo in the code-behind of the user control

I have demonstrated this with a small project . Please check the attached file.

All the best,
Pavel Pavlov
the Telerik team

Instantly find answers to your questions on the new Telerik Support Portal.
Watch a video on how to optimize your support resource searches and check out more tips on the blogs.

answered on 15 Oct 2009, 08:55 PM

I modified this to more closely resemble how I need this to work and it is throwing an error now. The only real difference is that I'm trying to create the editTemplate in code. When I try to edit the column I get the dreaded AG_E_PARSER_BAD_TYPE error. I need to create this in the code since my multicolumncombo class has some public properties that I am filling in with the XAML that I create.

                            <telerik:RadGridView x:Name="RadGridView1" AutoGenerateColumns="False" >         
                        <telerik:RadGridView.Columns>         
                            <telerik:GridViewDataColumn DataMemberBinding="{Binding Name}" />         
                            <telerik:GridViewComboBoxColumn Width="205" DataMemberBinding="{Binding CountryID, Mode=TwoWay}" DisplayMemberPath="Name" SelectedValueMemberPath="ID" />         
                        </telerik:RadGridView.Columns>         
                    </telerik:RadGridView>         
                     

                            Public Sub New()         
                     
                        InitializeComponent()         
                     
                        Dim persons As New List(Of Person)()         
                        persons.Add(New Person(1, "Carlos"))         
                        persons.Add(New Person(2, "Hans"))         
                        persons.Add(New Person(3, "Pierre"))         
                     
                        Me.RadGridView1.ItemsSource = persons         
                     
                        Dim editXAML As String = "<DataTemplate xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation"" xmlns:local=""clr-namespace:multiColumnCombo_SL""><local:MultiColumnCombo Width=""200"" Height=""Auto"" /></DataTemplate>"         
                        Dim editTemplate As New DataTemplate         
                        editTemplate = CType(System.Windows.Markup.XamlReader.Load(editXAML.ToString), DataTemplate)         
                        RadGridView1.Columns(1).CellEditTemplate = editTemplate         
                     
                        DirectCast(Me.RadGridView1.Columns(1), GridViewComboBoxColumn).ItemsSource = GetCountries()         
                    End Sub         
                     

answered on 22 Oct 2009, 02:18 PM

I have added a cell template to go along with my edit template so it will be formatted to look like the combobox item template. I can read the value from the cell and build the textblocks setting their text property to the actually text but that does not update. How do I bind the control to the selected item in the edit template's combobox. If I change rows this will fire back through the loaded event and work fine. How can I either bind this to the selected item or force the load event? I know I can do it by calling grid rebind on celledit ended but that seems like overkill.

                    <UserControl x:Class="Silverlight.UQube.multiColumnComboView"         
                xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"          
                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"          
                Width="Auto" Height="Auto">         
                <Grid x:Name="LayoutRoot">         
                    <ContentPresenter x:Name="cpTemplate">         
                                 
                    </ContentPresenter>         
                </Grid>         
            </UserControl>         

                        Private _ListID As Integer         
                     
                Public Property ListID() As Integer         
                    Get         
                        Return _ListID         
                    End Get         
                    Set(ByVal Value As Integer)         
                        _ListID = Value         
                    End Set         
                End Property         
                     
                Public Sub New()         
                    InitializeComponent()         
                End Sub         
                     
                Private Sub multiColumnComboView_Loaded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles Me.Loaded         
                     
                    Dim parentColumn As GridViewComboBoxColumn = TryCast(Me.ParentOfType(Of GridViewCell)().Column, GridViewComboBoxColumn)         
                     
                    Dim list As DataFrameworkReference.DataFrameworkDynamicList = (From dl In DynamicLists _         
                                                                                   Where dl._ListID = ListID _         
                                                                                   Select dl).First         
                     
                    Dim sp As New StackPanel         
                    sp.Orientation = Orientation.Horizontal         
                     
                    Dim value As Object = Me.ParentOfType(Of GridViewCell)().Value         
                    Dim row As DataRow = Nothing         
                     
                    If Not value Is Nothing Then         
                        row = CType(parentColumn.ItemsSource, DataView).Table.Select(String.Format("{0} = '{1}'", list._ValueColumn, value.ToString))(0)         
                    End If         
                     
                    For Each c As DataFrameworkReference.DynamicListColumn In list._Columns         
                     
                        Dim tb As New TextBlock         
                        If Not row Is Nothing Then tb.Text = row.Item(c._Column).ToString         
                        sp.Children.Add(tb)         
                     
                    Next         
                     
                    cpTemplate.Content = sp         
                     
                End Sub         

answered on 29 Oct 2009, 01:56 PM

Hi Scott ,

I believe the following approach may give a result here :

1. Subscribe to the selection changed event of your ComboBox
2. In the handler of this event you may get a reference to the containing Cell

        *you can use the extension method sender.ParentOfType<GridViewHeaderCell>();
        * you need to cast the sender to FrameworkElement
        * you will need to add the Telerik.Windows.Controls namespace to have this method available

3. Having the cell you now have access to its DataContext which is in fact your business object. Here you set the relevant property of your business object. This should update the display content .

I have tested it here with a mock business object which does not implement INotifyPropertyChanged and it seems to work.

In case this does not solve the problem you can open a support ticket and send me your project. I will gladly apply the fixes needed.

Best wishes,
Pavel Pavlov
the Telerik team

Instantly find answers to your questions on the new Telerik Support Portal.
Watch a video on how to optimize your support resource searches and check out more tips on the blogs.

answered on 30 Oct 2009, 08:04 PM

I have the following, but the problem is that the display still does not get updated.

                            Dim parentColumn As GridViewComboBoxColumn = TryCast(Me.ParentOfType(Of GridViewCell)().Column, GridViewComboBoxColumn)         
                    CType(CType(sender, FrameworkElement).ParentOfType(Of GridViewCell)().DataContext, DataRowView).SetData(parentColumn.UniqueName, multiCombo.SelectedValue)         
                     

Since I also have a view and edit template is there some event I need to hook up my view template with so that it can rebuild itself outside of just the Loaded event?

answered on 30 Oct 2009, 08:49 PM

I was able to hook up my view template to the handle the property changed event of the datarow. I then check in there if it is the column that this view is associated with and then I rebuild the cell.

                        Private Sub multiColumnComboView_Loaded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles Me.Loaded         
                    Dim rv As DataRowView = CType(Me.ParentOfType(Of GridViewCell)().DataContext, DataRowView)         
                    AddHandler rv.PropertyChanged, AddressOf PropertyChanged         
                    Load()         
                End Sub         
                     
                Private Sub PropertyChanged(ByVal sender As Object, ByVal e As System.ComponentModel.PropertyChangedEventArgs)         
                    If e.PropertyName = TryCast(Me.ParentOfType(Of GridViewCell)().Column, GridViewComboBoxColumn).UniqueName Then         
                        Load()         
                    End If         
                End Sub         