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POHow do I bind a DataGridComboBoxColumn to EntityFramework using MVVM?
 

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  1. POHow do I bind a DataGridComboBoxColumn to EntityFramework using MVVM?
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    <p>I'm trying to get a DataGridComboBoxColumn working with my ViewModel. Everything appears to work correctly but when I change the value of the combo box, the entity isn't changed. </p> <p>The datacontext of the window has these properties:</p> <p><strong>ItemsSource</strong></p> <pre><code>Public Property AllEnergySources() As ObservableCollection(Of EnergySourceViewModel) </code></pre> <p><strong>SelectedItemBinding</strong></p> <pre><code> Private _CurrentEnergySource As EnergySourceViewModel Public Property CurrentEnergySource() As EnergySourceViewModel Get Return _CurrentEnergySource End Get Set(ByVal value As EnergySourceViewModel) _CurrentEnergySource = value OnPropertyChanged("CurrentEnergySource") End Set End Property </code></pre> <p>I feel the problem lies with how I populate CurrentEnergySource in the ViewModel that is the DataContext:</p> <pre><code>Sub New(SelectedEntity as EquipmentEnergySource) AllEnergySources = New ObservableCollection(Of EnergySourceViewModel) //Select all EnergySources from the EntityFramework Dim EnergyEntities = From esr in db.EnergySources Select esr //Loop through to convert Entity POCO to Collection of ViewModels For Each es In EnergyEntities _AllEnergySources.Add(New EnergySourceViewModel(es)) //Optionally Set the newly created ViewModel to SelectedItemBinding object If es.EnergySourceID = SelectedEntity.EnergySourceID Then _CurrentEnergySource = _AllEnergySources.Last End If Next End Sub </code></pre> <p>When I create the backing collection for the combobox, if the model is the selected one, I set that viewmodel to be the CurrentEnergySource but after that point it is disconnected(and that's the problem)</p> <p>What should I reference in CurrentEnergySource so that it updates the model when the combo box changes?</p>
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    1. COAre you binding TwoWay and does EnergySourceViewModel implement INotifyPropertyChanged?
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    2. COYes & yes but the issue is the property i'm binding to (CurrentEnergySource) has its own backing field. Instead of a backing field what should the property be getting/setting?
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    3. COShow were you bind the DataGridComboBoxColumn
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