Binding doesn't work for navigation properties

I am binding WPF with Entity-Framework.

The Window.DataContext property is set to a Quote. This Quote has a property Job, that I have to trigger Quote.JobReference.Load it should load from the server.

<ContentControl Content="{Binding Job}" 
    ContentTemplate="{StaticResource JobTemplateSummary}"/>

开发者_高级运维

As you can see above, I am trying to bind a ContentControl to the Window's DataContext which is a StaticResource Quote class.

I am calling the Load in the Window.Load even handler. Should I've called somewhere else?

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The problem was that Navigation Properties don't call PropertyChanged event by default so when the window is bound (which is before Page_Load handler) the JobReference was still not Loaded, we have to call Quote.OnPropertyChanged("Job") explicitly when the job property changes, so the WPF UI knows to refresh the control binding.

I added the following to the Quote class, and this solved the problem:

Public Sub New()
    AddHandler JobReference.AssociationChanged, _
        AddressOf Job_AssociationChanged
End Sub

Sub Job_AssociationChanged(sender As Object, e As CollectionChangeEventArgs)
    OnPropertyChanged("Job")
End Sub