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Custom Hierarchy: Adding ChildTableDefinitions to the expandable row creates exception

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GridView
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Jitin Vishwakarma
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Jitin Vishwakarma asked on 13 Jan 2010, 10:04 PM
Hi,

I had a piece of code to add hierarchy to the GridView that works fine in version Q2 2009. I add Child grid at runtime where I cannot even use the binding because the structure of the data is not defined and is based on user interactions.
I had a code that looked something like this:

void TableDefinition_PreviewDataRecordCreate(object sender, DataRecordCreateEventArgs e)
{
GridViewTableDefinition detailDefinition = new GridViewTableDefinition();
detailDefinition.AutoGenerateFieldDescriptors = false;

// create colMultiplier
detailDefinition.FieldDescriptors.Add(colMultiplier);

// Create Data Source for Child Nodes
var sourceDataRecs = new List<object>();
// fill sourceDataRecs

detailDefinition.DataSource = sourceDataRecs;
e.IsExpandableRecord = true;
e.ChildTableDefinitions.Add(detailDefinition);
e.GridViewDataControl.ChildTableDefinitions.Add(detailDefinition);
}

This is replaced by the following code in Q3:
    private void radTargetGridNodes_RowLoaded(object sender, RowLoadedEventArgs e)
    {
        GridViewTableDefinition detailDefinition = new GridViewTableDefinition();
        detailDefinition.AutoGenerateFieldDescriptors = false;
        detailDefinition.FieldDescriptors.Add(colMultiplier);

        // Create Data Source for Child Nodes
        var sourceDataRecs = new List<object>();

        detailDefinition.DataSource = sourceDataRecs;        
        ((GridViewRow)e.Row).IsExpandable = true;
        e.GridViewDataControl.ChildTableDefinitions.Add(detailDefinition);  ----> THIS LINE CREATES EXCEPTION
        /// Exception - HRESULT E_FAIL  Managed RunTime Error #4004
    }

Would there be a better way to do this?

Thanks,
Jitin

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Vlad
Telerik team
answered on 14 Jan 2010, 07:11 AM
Hi,

Since PreviewDataRecordCreate you can use a bit different approach to achieve custom hierarchy demonstrate here:
http://demos.telerik.com/silverlight/#GridView/Hierarchy/CustomHierarchy

Regards,
Vlad
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Jitin Vishwakarma
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answered on 14 Jan 2010, 03:34 PM
Hi Vlad,

If you look closely in the code provided above, I am using RowLoaded event for Q3 instead of PreviewDataRecordCreate.
I have seen the Demo/examples code for Q3. But the whole point for my question is that I cannot bind the child rows until during runtime. That is the reason why I had to add GridViewTableDefinition instance to ChildTableDefinitions of the parent row. Why does this no longer work in Q3? Or am I doing something wrong?

Thanks,
Jitin
0
Vlad
Telerik team
answered on 14 Jan 2010, 03:37 PM
Hi Jitin,

Sorry, I've missed this!

Still you do not need to add child tables dynamically - please check the demo I've posted in my previous reply.

Kind regards,
Vlad
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Frank Gusche
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answered on 14 Jan 2010, 04:28 PM
Hi,

I have exactly the same problem. It's not possible to add a GridViewTableDefinition in code behind.
You always get the error "HRESULT E_FAIL ...".
Sorry Vlad, the demo isn't helpful.

Any other ideas?

Thanks,
Frank
0
Vlad
Telerik team
answered on 15 Jan 2010, 06:51 AM
Hello Frank,

Can you post more info why you need to add child tables dynamically? Our demo demonstrate how to create custom hierarchy - why the demo is not helpful? Please clarify.

Best wishes,
Vlad
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Frank Gusche
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answered on 19 Jan 2010, 09:05 AM
Hi Vlad,

my colleague had solved the problem.
In the new version you have to define a "ChildTableDefinition" in the foreground-code.



<telerikGridView:RadGridView       
                        Grid.Row="1"                
                        Margin="10"  
                        ItemsSource="{Binding Holdings}"  
                        x:Name="_gridHolding" 
                        ColumnsWidthMode="None"  
                        ShowGroupPanel="False"                         
                        IsReadOnly="True"  
                        ScrollMode="RealTime" 
                        AutoGenerateColumns="True"
 
                            <telerikGridView:RadGridView.ChildTableDefinitions> 
                                <telerikGridView:GridViewTableDefinition> 
 
                                </telerikGridView:GridViewTableDefinition> 
                            </telerikGridView:RadGridView.ChildTableDefinitions> 
                            <telerikGridView:RadGridView.HierarchyChildTemplate> 
                                <DataTemplate> 
                                    <StackPanel> 
                                        <telerikGridView:RadGridView  
                                                AutoGenerateColumns="True" 
                                                x:Name="_gridTransactions" 
                                                ShowGroupPanel="False" 
                                                IsReadOnly="True"  
                                                Loaded="_gridTransactions_Loaded" 
                                                > 
                                        </telerikGridView:RadGridView> 
                                    </StackPanel> 
                                </DataTemplate> 
                            </telerikGridView:RadGridView.HierarchyChildTemplate> 
 
                        </telerikGridView:RadGridView> 


At the outer grid you can now define a "RowLoaded-Event":

void _gridHolding_RowLoaded(object sender, Telerik.Windows.Controls.GridView.RowLoadedEventArgs e) 
        { 
            GridViewRow row = e.Row as GridViewRow; 
            InstrumentsHoldings holding = e.DataElement as InstrumentsHoldings; 
 
            if(row != null && holding != null
            { 
                row.IsExpandable = true
                 
                GridViewTableDefinition detailDefinition = new GridViewTableDefinition(); 
... 
 


In the inner grid you have to define a "Loaded-Event" where you bind your data.

private void _gridTransactions_Loaded(object sender, RoutedEventArgs e) 
        {            
            var k = sender as GridViewDataControl; 
 
            var cont = k.ParentRow.DataContext; 
           
            k.ItemsSource = ItemsSource; 
        } 


When you haven't the "ChildTableDefinitions" in the foreground-code and want do add some from the code behind then the error "HRESULT E_FAIL ..." occurs.


That worked for me!

Hope it helps.


Regards,
Frank


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John
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answered on 14 Apr 2010, 04:45 PM
The demo link does not seem to be working.  I keep getting redirected to install Silverlight, which is definitely installed on my system. 

I have the same problem, but really I don't know how to do this any other way.  We have an XML column in the parent data that we display dynamically as a child table.  The XML can vary from row to row, so I create the child table on the fly.  I can't seem to get this to work on the row loaded event.  Here are a few snippets:
      private void DetailsGrid_RowLoaded(object sender, RowLoadedEventArgs e)  
        {  
 
            GridViewRow row = e.Row as GridViewRow;  
 
            if (row != null)  
            {  
 
                if (row.DataContext is DDO_SimpleXMLBaseClass)  
                {  
                    DDO_XMLBaseClassData data = (DDO_XMLBaseClassData)row.DataContext;  
                    if (data.TransactionXml.Count() > 0)  
                    {  
                        row.IsExpandable = true;  
                        e.GridViewDataControl.ChildTableDefinitions.Add(getTableDefFromXML(data.TransactionXml[0].ToString()));  
                    } 
...
       private GridViewTableDefinition getTableDefFromXML(string xml)  
        {  
            GridViewTableDefinition detailDefinition = new GridViewTableDefinition();  
            XmlDataProvider xdp = new XmlDataProvider();  
            xdp.IsAsynchronous = false;  
            System.Xml.XmlDocument doc = new System.Xml.XmlDocument();  
            doc.LoadXml(xml);  
            xdp.Document = doc;  
            xdpxdp.XPath = xdp.Document.FirstChild.Value;  
            xdp.XPath = "/" + doc.DocumentElement.Name;  
            detailDefinition.DataSource = new ObservableCollection<XmlNode>((IEnumerable<XmlNode>)xdp.Data);  
            return detailDefinition;  
        } 

Not sure what to try at this point.
Thanks

John
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Vlad
Telerik team
answered on 16 Apr 2010, 07:10 AM
Hello,

Can you post more info about your Silverlight version? I've just tried the demo using both Silverlight 3 and Silverlight4 and everything worked as expected.

Kind regards,
Vlad
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GridView
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Jitin Vishwakarma
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Vlad
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Jitin Vishwakarma
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Frank Gusche
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John
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