XmlParseException - The default connectors cannot be removed because connections are attached to it.

[Mahmut]

Hi,
Connectors of some items are generated dynamically in run-time, so I tried to bind Connectors using Extension. Drag-drop process are definitely working good, but when I bind all diagram,before calling extension method, it throws exception "XmlParseException - The default connectors cannot be removed because connections are attached to it.".

Thanks in advance.

    public class ConnectorExtension
    {

        public static readonly DependencyProperty ConnectorsProperty =
            DependencyProperty.RegisterAttached("Connectors", typeof(List<ConnectorModel>), typeof(ConnectorExtension), new UIPropertyMetadata(null, new PropertyChangedCallback(ConnectorsChanged)));



        public static void SetConnectors(UIElement element, List<ConnectorModel> value)
        {
            element.SetValue(ConnectorsProperty, value);
        }
        public static List<ConnectorModel> GetConnectors(UIElement element)
        {
            return (List<ConnectorModel>)element.GetValue(ConnectorsProperty);
        }


        public static void ConnectorsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var connectors = e.NewValue as List<ConnectorModel>;
            var shape = d as RadDiagramShapeBase;
            if (shape != null )
            {
                if (connectors != null)
                {
                    shape.UseDefaultConnectors = false;
                    shape.Connectors.Clear();
                    connectors.ForEach(connector => shape.Connectors.Add(new RadDiagramConnector() { Offset = connector.Offset, Name = connector.Name, Tag=connector.Name }));
                }
                else
                {
                    shape.UseDefaultConnectors = false;
                    shape.Connectors.Clear();
                }
            }
        }

    }
}

<Style x:Key="DynamicConnectorStyle" TargetType="telerik:RadDiagramShape">
    <Setter Property="Position" Value="{Binding Position, Mode=TwoWay}"/>
    <Setter Property="IsSelected" Value="{Binding IsSelected}" />
    <Setter Property="Height" Value="{Binding Height}" />
    <Setter Property="Width" Value="{Binding Width}" />
    <Setter Property="Background" Value="Transparent" />
    <Setter Property="IsEditable" Value="False" />
    <Setter Property="StrokeThickness" Value="0" />
    <Setter Property="UseDefaultConnectors" Value="False"/>
    <Setter Property="extensions:ConnectorExtension.Connectors" Value="{Binding Path=Connectors,UpdateSourceTrigger=PropertyChanged}"/>
    <Setter Property="ContentTemplate" Value="{Binding Path=TemplateKey,Converter={StaticResource DataTemplateSelector}}" />
</Style>

[Pavel R. Pavlov]

Hi,

The exception is self explained. There should be no connections attached to any connector in order to remove it. If there is a connection attached to any connector the exception will be thrown. You need to remove all links to a connector before removing the connector itself.

Regards,
Pavel R. Pavlov
Telerik

 

 

[Mahmut]

Hi Pavel,
Thanks for response. I understood the exception itself. Actually, it is weird. I put a breakpoint in the line where connectors are removed, but the line is not executed. In other words, throw exception before removing the connectors. I think there is a connector binded to connection, and I tried to remove this connector, but it is not. I know because I solved the problem. Real problem is visualization part, connections created before items. And connections are trying to find connectors which are binded, and they can't find.

[Pavel R. Pavlov]

Hi,

You are right about that behavior. Please note that the RadDiagram should remove all connectors of a shape when the RadDiagramShape.UseDefaultConnectors property is set to false. This is why you need to remove all connections before setting that property to false.

Regards,
Pavel R. Pavlov
Telerik