[Solved] GridViewComboBoxColumn not working with DomainDataSource

[Paul Brause]

Hello,

we are trying to implement a GridViewComboBoxColumn in a telerik RadGridView. Our Silverlight project uses RIA services (latest November BETA) to communicate with the database.

The Grid uses a DomainDataSource gridSource as data provider with RIA services in the background. The data provider for all ComboBox controls in the GridViewComboBoxColumn is another DomainDataSource comboSource. We cannot get things to work, the comboboxes are either empty or we are getting errors when starting our app.

Here is the definition of our datasources:

        <Controls:DomainDataSource x:Name="gridSource" AutoLoad="True" QueryName="GetCdArticle">
            <Controls:DomainDataSource.DomainContext>
                <AmaliaRIAServices:AmaliaDomainContext/>
            </Controls:DomainDataSource.DomainContext>
        </Controls:DomainDataSource>
        <Controls:DomainDataSource x:Name="comboSource" AutoLoad="True" QueryName="GetCdArtGroup1">
            <Controls:DomainDataSource.DomainContext>
            </Controls:DomainDataSource.DomainContext>
        </Controls:DomainDataSource>

The table we use in gridSource references comboSource via the property cdArtGroup1.ID. This is not a simple property,
cdArtGroup1is another entity object inside our article object, from which we need the property ID. comboSource references  an articlegroup table with two properties: ID and Caption and is used to feed our comboboxes.

When we create a single RadComboBox in our form the combobox is filled and displayed correctly with ID and Caption of DomainDataSource comboSource. Here is a code that works:

<telerikInput:RadComboBox ItemsSource="comboSource" DisplayMemberPath="Caption"/>

Our gridView generates one combobox per row and should feed the property cdArtGroup1.ID to the DataMemberBinding property of the GridComboBox which additionally sets the properties ItemssSource, DisplayMemberPath and SelectedValueMemberPath.

This is how we are generating out GridComboBoxes:

<telerik:GridViewComboBoxColumn Header="Combo" UniqueName="ComboGrp1" DataMemberBinding="{Binding ID, ElementName=cdArtGroup1}"
    ItemsSource="comboSource" SelectedValueMemberPath="ID" DisplayMemberPath="Caption"/>

The error message we get after starting our project is:

Unhandled Exception - Code 4004
Category: ManagedRunTimeError

Message: System.ArgumentException: Invalid property or field - "ID" for type:Char at
Telerik.Windows.Data.Expressions.MemberAccessTokenExtensions.Create...token,Expression Instance)
...
...
...

This code and other variations of this code are not working! So it seems that we are doing something wrong in accessing the properties.

Anyone help?

[Pavel Pavlov]

Hello Paul Brause,

If this is acceptable for you , can you please send me your project ( to be able to attach it you will need to open a support ticket) . I  will gladly modify it in order to make it  work .
In case sending your project  is not  acceptable we can try debug the problem step by step .

Best wishes,
Pavel Pavlov
the Telerik team

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[roger]

I woud be very interested to see a possible solution.

Thanks

[roger]

Heres the error i get:
   at EstateSuiteIntranetInterface.Views.WebContentManagement.cmdTable_Click(Object sender, RoutedEventArgs e)
   at System.Windows.Controls.Primitives.ButtonBase.OnClick()
   at System.Windows.Controls.Button.OnClick()
   at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   at System.Windows.Controls.Control.OnMouseLeftButtonUp(Control ctrl, EventArgs e)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)

Now i've solved this (partially) with a very very ugly workaround:

After the grid is loaded i execute this:

EntityQuery<EstateSuiteIntranetInterface.Web.WebColors> query = from c in context.GetWebColorsQuery()
select c;
LoadOperation<WebColors> loadOp = context.Load(query);

GridViewComboBoxColumn column = new GridViewComboBoxColumn();
column.Header = "Colors";
column = new GridViewComboBoxColumn();
column.ItemsSource = loadOp.Entities;
column.SelectedValueMemberPath = "id";
column.DisplayMemberPath = "name";
System.Windows.Data.Binding binding = new System.Windows.Data.Binding("fkWebColor");
column.DataMemberBinding = binding;
radGridViewWebSections.Columns.Add(column);
radGridViewWebSections.Rebind();

well... the items are bound but the current selection isn't initially displayed.. dont know why... but it's not a perfect solution.. not at all...