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Add combobox row in a radgridview

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Jean-Christophe
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Jean-Christophe asked on 18 Oct 2018, 08:49 AM

Hello

I am in vb.net with wpf, I have an existing radgridview with custom validationDiffProperty. I am using telerik v 2017.3.1018.45

My goal is to add a radgriview row with radcombox (see attach image). I know how to add a radcombobox column in a radgridview, but I don't know how to add a "radcombobox row" in a radgriview.

Could you please help me ?

Regards

Jean-Christophe

 

 

 

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Dinko
Telerik team
answered on 23 Oct 2018, 06:43 AM
Hello Jean-Christophe,

Thank you for the attached image.

I would recommend you to try using CellTemplateSelector property of the RadGridView columns. There is a CellTemplateSelector help article in our RadGridView documentation which further described this property. In your case, you can create one custom DataTemplateSelector class and applied to every column. Then you can just return the custom DataTemplate with RadComboBox inside only for the first cell.

Regards,
Dinko
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Jean-Christophe
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answered on 23 Oct 2018, 12:29 PM

Hello Dinko

Thanks for your information, I tried to adapt it a little bit because I can not use like it's descirbed in CellTemplateSelector 

I add a new datatemplateselector class like below

Public Class DropDownCellTemplateSelector
        Inherits DataTemplateSelector
 
        Public Overrides Function SelectTemplate(item As Object, container As DependencyObject) As DataTemplate
            If TypeOf item Is MyObjectType Then
                Return MyObjectDataTemplate
            Else
                Return Nothing
            End If
        End Function
 
        Public Property MyObjectDataTemplate() As DataTemplate
             
    End Class

 

I declared it in my xaml (see below)

 

<UserControl.Resources>
        <ResourceDictionary>
            <templateSelector:DropDownCellTemplateSelector x:Key="DropDownCellTemplateSelector">
                <templateSelector:DropDownCellTemplateSelector.MyObjectDataTemplate>
                    <DataTemplate>
                        <telerik:RadComboBox ItemsSource="{Binding MyObjectList}" DisplayMemberPath="Name"/>
                    </DataTemplate>
                </templateSelector:DropDownCellTemplateSelector.MyObjectDataTemplate>
            </templateSelector:DropDownCellTemplateSelector>
...
...
...

 

and I added it to my columns using behind code of the xaml because column are dynamically built (see below)

 

Private Sub GridViewDataControlOnAutoGeneratingColumn(sender As Object, e As GridViewAutoGeneratingColumnEventArgs)
        If (e.Column.UniqueName = "TitleColumn") Then
            e.Column.Width = TITLE_WIDTH
            e.Column.IsReadOnly = True
        Else
            e.Column.Width = COLUMN_WIDTH
            e.Column.CellEditTemplateSelector= CType(Me.Resources("DropDownCellTemplateSelector"), Controls.DataTemplateSelector)
            Dim binding = New Binding("IsInEditMode")
            binding.Converter = Me._invertedBooleanConverter
            e.Column.SetBinding(GridViewColumn.IsReadOnlyProperty, binding)
        End If
    End Sub

 

But I have a pb because the method SelectTemplate of DropDownCellTemplateSelector is never hit, do you have an idea ?

Thank

 

an-Christophe

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Jean-Christophe
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answered on 23 Oct 2018, 02:35 PM

Never mind about my previous post, I made a mistake, I wrote CellEditTemplateSelector instead of CellTemplateSelector, now the radcombobox appear but they are not populate, whereas the list is well filled, and raisePropertyChanged event raised.

Do you know if some trouble coule appear with radcombobox in radgridview ?

Thanks

Regards

Jean-Christophe

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Jean-Christophe
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answered on 25 Oct 2018, 08:06 AM

Hello Dinko

Thanks for all, it works, the only thing which doesn't work yet is the assignation of combobox value when radgridview is populated, but I think it's because I use personnal validationDifProperty.

If somemone needs to do the same thing, below you could find the code :

datatemplateSelector class :

01.Public Class DropDownCellTemplateSelector
02.        Inherits DataTemplateSelector
03. 
04.        Public Overrides Function SelectTemplate(item As Object, container As DependencyObject) As DataTemplate
05.            If TypeOf item Is MyObjectType Then
06.                Return MyObjectDataTemplate
07.            Else
08.                Return Nothing
09.            End If
10.        End Function
11. 
12.        Public Property MyObjectDataTemplate() As DataTemplate        
13. 
14.    End Class

xaml file :

01.<UserControl.Resources>
02.        <ResourceDictionary>
03.            <templateSelector:DropDownCellTemplateSelector x:Key="DropDownCellTemplateSelector">
04.                <templateSelector:DropDownCellTemplateSelector.MyObjectDataTemplate>
05.                    <DataTemplate>
06.                        <telerik:RadComboBox ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.MyObjectList}" DisplayMemberPath="Name" SelectedValuePath="Id" IsEnabled="{Binding  RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, Path=DataContext.IsInEditMode}"/>
07.                    </DataTemplate>
08.                </templateSelector:DropDownCellTemplateSelector.MyObjectDataTemplate>
09.            </templateSelector:DropDownCellTemplateSelector>
10....
11....
12....

xaml.vb :

01.Private Sub GridViewDataControlOnAutoGeneratingColumn(sender As Object, e As GridViewAutoGeneratingColumnEventArgs)
02.        If (e.Column.UniqueName = "TitleColumn") Then
03.            e.Column.Width = TITLE_WIDTH
04.            e.Column.IsReadOnly = True
05.        Else
06.            e.Column.Width = COLUMN_WIDTH
07.            e.Column.CellTemplateSelector= CType(Me.Resources("DropDownCellTemplateSelector"), Controls.DataTemplateSelector)
08.            Dim binding = New Binding("IsInEditMode")
09.            binding.Converter = Me._invertedBooleanConverter
10.            e.Column.SetBinding(GridViewColumn.IsReadOnlyProperty, binding)
11.        End If
12. 
13.    End Sub

 

Regards

J-Christophe

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Dinko
Telerik team
answered on 26 Oct 2018, 08:25 AM
Hello Jean-Christophe,

I have created a sample project which demonstrates how you can populate the RadComboBox in the first cell of a column. My understanding is that you are struggling with binding the SelectedItem property of every combo box control. After investigating on my side I think I manage to found a possible approach. What you can do is to create a property for every ComboBox in the RadGridView business object. Then you can use bind the SelectedItem property of the RadComboBox to the GridViewCell using RelativeSource and set an IValueConverter class. In the Convert method, you can check the column header and create the binding depending on the name. Check the attached project. When you open the project you can add breakpoints in the setter of the CustomerNameComboBoxValue and CustomerIDComboBoxValue which is fired when you select an item from the comboboxes.

Regards,
Dinko
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