[Solved] Self-Referencing Hierarchy Duplicated Rows

[Joseph]

Hi guys,

I followed the Self-Referencing Hierarchy example in the demos section to create a GridView with nested childs rows.

My DataModel contains of course an ID and ParentID plus other attributes.

Let's say we have  3 rows as follow :

ID = 1, ParentID = 0
ID = 2, ParentID = 0
ID = 3, ParentID = 2

As we can see, the third row is child of the second row.

Now when I bind the grid to this list of data, I get 3 visible rows and the second row contains the third row when u collpase it. I don't know why the GridView show the third row seeing that it is the child if the second Row.

Any idea ?

[Milan]

Hello Joseph,

This is by design but you can easily hide such rows from appearing on the root level by creating a filter descriptor which would only allow rows with ParentID equal to 0.

Hope this helps.

Greetings,
Milan
the Telerik team

[Joseph]

Thanks for the heads up.

I used this code :

<controls:RadGridView.FilterDescriptors>
                           <data:FilterDescriptor Member="ParentID" Operator="IsEqualTo" Value="0"/>


                       </controls:RadGridView.FilterDescriptors>

I have one more issue.

I want to create dynamically a custom column in the child Grid. This column will contain some buttons. And I want to assign them some handlers like Click and load.

How can I achieve these 2 issues ?

I create the columns at code behind inside the DataLoading event handler of the GridView as follow :

private void RadGridView1_DataLoading(object sender, GridViewDataLoadingEventArgs e)
       {
           GridViewDataControl dataControl = (GridViewDataControl)sender;

           if (dataControl.ParentRow != null)
           {

               dataControl.ShowGroupPanel = false;
               dataControl.AutoGenerateColumns = false;
               dataControl.CanUserFreezeColumns = false;
               dataControl.IsReadOnly = true;
               dataControl.ChildTableDefinitions.Clear();

               GridViewDataColumn column = new GridViewDataColumn();
               column.DataMemberBinding = new System.Windows.Data.Binding("ProjectName");
               dataControl.Columns.Add(column);

               column = new GridViewDataColumn();
               column.DataMemberBinding = new System.Windows.Data.Binding("FileName");
               dataControl.Columns.Add(column);

               column = new GridViewDataColumn();
               column.DataMemberBinding = new System.Windows.Data.Binding("PONumber");
               dataControl.Columns.Add(column);

               column = new GridViewDataColumn();
               column.DataMemberBinding = new System.Windows.Data.Binding("TargetLanguage");
               dataControl.Columns.Add(column);





           }
       }

[Milan]

Hi Joseph,

What you can do in this situation is define a custom cell template template for your button column:

<Window.Resources>
    <my:MyViewModel x:Key="MyViewModel"/>
    <DataTemplate x:Key="columnTemplate">
        <Button Content="MyButton"/>
    </DataTemplate>
</Window.Resources>

Then in RadGridView1_DataLoading create the button column and apply its CellTemplate:

GridViewDataColumn column = new GridViewDataColumn();
                column.CellTemplate = this.Resources["columnTemplate"] as DataTemplate;
                dataControl.Columns.Add(column);

Finally you should subscribe for Button's Click event:

public MainWindow()
{
    InitializeComponent();

    this.playersGrid.DataLoading += new EventHandler<GridViewDataLoadingEventArgs>(playersGrid_DataLoading);
    this.AddHandler(Button.ClickEvent, new RoutedEventHandler(OnButtonClick));
}

private void OnButtonClick(object sender, RoutedEventArgs e)
{

}

Hope this helps.


Kind regards,
Milan
the Telerik team