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Question about Groups in RadGrid

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GridView

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Guillermo Aquino asked on 05 Jul 2010, 08:52 AM

items.JPG

I'm using a RadGridView for Silverlight - version Q2 2010
Firstly, my Grid hasn't groups,
My problem is that when i do the first grouping then items.groups property has a exception

+ base {System.InvalidCastException: Impossible d'effectuer un cast de l'objet de type 'Telerik.Windows.Examples.Customers' en type 'Telerik.Windows.Data.AggregateFunctionsGroup'.

On the other hand if i delete and re-create the same group, this error is not showing.

Thanks
Guillermo

4 Answers, 1 is accepted

answered on 05 Jul 2010, 09:44 AM

Hi
for my test, I'm using the RowNumber Gridview Example for "RadControls for Silverlight Q2 2010".

XAML

    
            <Examples:GridViewExample x:Class="Telerik.Windows.Examples.GridView.RowNumber.Example" 
        
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        
            xmlns:Examples="clr-namespace:Telerik.Windows.Examples" 
        
            xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" 
        
            xmlns:custom="clr-namespace:Telerik.Windows.Examples.GridView.RowNumber">  
        
            <Grid> 
        
            <Image Source="/GridView;component/Images/bg02.jpg" /> 
        
            <telerik:RadGridView x:Name="RadGridView1" ItemsSource="{Binding Customers}" AutoGeneratingColumn="RadGridView1_AutoGeneratingColumn">  
        
            <telerik:RadGridView.Columns> 
        
            <custom:MyColumn Header="#" Width="50" /> 
        
            </telerik:RadGridView.Columns> 
        
            </telerik:RadGridView> 
        
            </Grid> 
        
            </Examples:GridViewExample>

Code-Behind

    
            using Telerik.Windows.Data;  
        
            using System.ComponentModel;  
        
            using Telerik.Windows.Controls;  
        
            namespace Telerik.Windows.Examples.GridView.RowNumber  
        
            {  
        
            /// <summary>  
        
            /// Interaction logic for Example.xaml  
        
            /// </summary>  
        
            public partial class Example  
        
            {  
        
            public Example()  
        
            {  
        
            InitializeComponent();  
        
            this.RadGridView1.Grouped += new System.EventHandler<Controls.GridViewGroupedEventArgs>(RadGridView1_Grouped);  
        
            }  
        
            private void RadGridView1_Grouped(object sender, GridViewGroupedEventArgs e)  
        
            {  
        
            DataItemCollection dic = RadGridView1.Items;  
        
            }  
        
            private void RadGridView1_AutoGeneratingColumn(object sender, Telerik.Windows.Controls.GridViewAutoGeneratingColumnEventArgs e)  
        
            {  
        
            if (e.Column.UniqueName == "Order" || e.Column.UniqueName == "Product")   
        
            {  
        
            e.Cancel = true;  
        
            }  
        
            }  
        
            }  
        
            }

Thanks
Guillermo