ArgumentOutOfRangeException in RadGrid_ItemDataBound

[Peter]

I'm getting an exception System.ArgumentOutOfRangeException thrown in the ItemDataBound callback of a RadComboBox that is in a GridDropDownColumn; breaking on editableItem.GetDataKeyValue() after inserting an item.  Can someone explain what is going on and what I'm need to do to correct it?

I have a grid that is bound via OnNeedDataSource to a table. A second table is bound (in code) to a column, though disabling it still shows the problem.  Ultimately I'm trying to select the customer in the combo box to the current item, but if there isn't a customer then to select the first "No Customer" item.

<telerik:RadGrid runat="server" ID="Test_RadGrid" AutoGenerateColumns="false" AllowPaging="true"
    OnNeedDataSource="RadGrid_NeedDataSource" OnUpdateCommand="RadGrid_UpdateCommand"
    OnItemCreated="RadGrid_ItemCreated" OnDeleteCommand="RadGrid_DeleteCommand"
    OnInsertCommand="RadGrid_InsertCommand" OnItemDataBound="RadGrid_ItemDataBound">
    <MasterTableView DataKeyNames="ID" CommandItemDisplay="Top" InsertItemPageIndexAction="ShowItemOnCurrentPage" EditMode="InPlace">
        <Columns>
            <telerik:GridEditCommandColumn ButtonType="ImageButton" />
            <telerik:GridBoundColumn DataField="ID" HeaderText="ID" ReadOnly="true" ForceExtractValue="Always" ConvertEmptyStringToNull="true" />
            <telerik:GridBoundColumn DataField="Name" HeaderText="Name" />
            <telerik:GridDropDownColumn UniqueName="CustomerCombo" HeaderText="Customer" DropDownControlType="RadComboBox" />
        </Columns>
    </MasterTableView>
</telerik:RadGrid>

protected void RadGrid_NeedDataSource(object source, GridNeedDataSourceEventArgs e)
{
    Test_RadGrid.DataSource = DataSource(); // linq to sql join statement
}

protected void RadGrid_ItemDataBound(object source, GridItemEventArgs e)
{
    if (e.Item is GridEditableItem && e.Item.IsInEditMode)
    {
        GridEditableItem editableItem = e.Item as GridEditableItem;

        // ^---- At this point editableItem.KeyValues, in Watch window, says KeyValues threw an exception
        // of type System.ArgumentOutOfRangeException, but doesn't break

        GridEditManager editManager = editableItem.EditManager as GridEditManager;
       GridDropDownListColumnEditor editor = editManager.GetColumnEditor("CustomerCombo") as GridDropDownListColumnEditor;

        //editor.DataSource = Customer.DataSource();
        //editor.DataValueField = TestField.ID;
        //editor.DataTextField = TestField.Name;
        //editor.DataBind();

        RadComboBox combo = editableItem[TestField.CustomerCombo].Controls[0] as RadComboBox;
        combo.AppendDataBoundItems = true;
        combo.Items.Insert(0, new RadComboBoxItem("No customer selected", "0"));

        var ret = (int)editableItem.GetDataKeyValue("0"); //  <-- OutOfRangeException thown, debugger
    }

[Peter]

To add a bit more context...this is when adding a record

[Konstantin Dikov]

Hello Peter,

The error that you are receiving is rather expected, because you can not retrieve DataKeyValue from insert item. To handle this within the OnItemDataBound event you must ensure that the item is not an insert item, before calling the GetDataKeyValue method:

if (!(editableItem is GridDataInsertItem))
{
    var ret = (int)editableItem.GetDataKeyValue("ID");
}

Hope this helps.


Regards,
Konstantin Dikov
Telerik

 

 

[Peter]

It cleared up how things work and got me onto the answer - I query the DataSource for the CustomerID and then combo.SelectedValue = customerID.  Thanks for the direction!