Display null value

[jbaird]

I am trying to bind a null foreign key to a specific value in the combo box itemssource.  Below is the relevant code.  Do you have any suggestions on how to make this display "None" instead of remaining blank?
 

/// <summary>

/// Event handler

/// </summary>

private void ClientBiz_OnDataListRefreshed(object sender, ClientBizNew.DataListRefreshedEventArgs e)

{

    //Get the xml and clear the respective list.

    string xml = this.ClientBiz.GetDataListResult(e.ServiceName, e.QueryName);

    if (!string.IsNullOrEmpty(xml))

    {

        XDocument xd = XDocument.Parse(xml);

 

if (e.ServiceName.Equals("GLChart"))

            {

                _chartList.Clear();

                _chartList.Add(new GLChartObject() { GLChartKey = null, GLChartName = "None" });

            }

 

 

            //get the xml nodes

            var nodes = from x in xd.Descendants(e.ServiceName) select x;

 

            //set the properties in the corresponding data class

            foreach (var n in nodes)

            {

                if (e.ServiceName.Equals("GLChart") && e.QueryName.Equals("GETALL"))

                {

                    int key = Convert.ToInt32(n.Element("PK_GLChart").Value);

                    string name = n.Element("ChartName").Value;

 

                    _chartList.Add(new GLChartObject() { GLChartKey = key, GLChartName = name });

 

                }

            }

 

 

            //set the binding of the respective combo box to the list.

            if (e.ServiceName.Equals("GLChart"))

            {

                this.cboChartOfAccounts.ItemsSource = _chartList;

            }

        }

    }
}

 

public class GLChartObject

{

    public int? GLChartKey { get; set; }

    public string GLChartName { get; set; }

}

 

<bfgs:RadComboBox x:Name="cboChartOfAccounts"

                  DisplayMemberPath="GLChartName"

                  SelectedValue="{Binding FK_GLChart, Mode=TwoWay}"

                  SelectedValuePath="GLChartKey"

                  FilteringMode="StartsWith"

                  Grid.Row="1"

                  Grid.Column="1"

                  Margin="2,2,2,2"

                  Height="22"

                  VerticalAlignment="Top"

                  TabIndex="6"/>

Thanks for your help.

[Valeri Hristov]

Hello jbaird,

I am afraid that the officially released version of RadComboBox (2009 SP1) has a bug that breaks scenarios like yours. I managed to fix it and I will be able to send you the new assemblies + sample application tomorrow (the build needs to be tested). Since this is a forum post, I am allowed to attach only trial assemblies here. Please, open a new support ticket if you want the developer assemblies (without trial check).

Regards,
Valeri Hristov
the Telerik team

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