SelectNode MVVM is null

GoXam
1

Hello all,

I need some help with MVVM and GoXam. I try to bind the SelectedNode Property in my View Model. But the value I get is always null. Did I miss sometihing or is the binding wrong? (I know there are similar other posts, but i don’t get it work…)

My .xmal:
…
DataContext="{Binding Source={x:Static vm:ViewModelManager.ViewModelMain}, Path=ViewModelBatchViewDiagram}"
Title=“BatchViewDiagram”
…
go:Diagram
Model="{Binding Path=Model, Mode=TwoWay}"
MaximumSelectionCount=“1”
SelectedNode="{Binding Path=SelectedNode, Mode=TwoWay}"
…

In my ViewModel:

private MyNodeData selectedNode;

public IDiagramModel Model { get { return model; } set { model = value; }}
public MyNodeData SelectedNode
{
get
{
return selectedNode;
}
set
{
selectedNode = value;
OnPropertyChanged(“SelectedNode”);
}
}

2

First, if you are going to bind Diagram.Model, you should set HasDefaultModel=“False”.

Second, Diagram.SelectedNode is of type Node, not whatever node data type you have in your model.

3

Hello Walter,

thank you for the reply. I solved the problem with the selected Nodes. But when I set HasDefaultModel as false it will display nothing. Do I have to set another property of my binded Model, too?

4

Actually, it depends on the order in which the Diagram and its ControlTemplate get applied. If it works without setting HasDefaultModel=“False”, you don’t need to. I misread your XAML.