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PO
 

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  1. PO
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    <p>I faced the same issue. I've introduced interface ISupportEditingState:</p> <pre><code>public interface ISupportEditingState { EditingState EditingState { get; set; } } </code></pre> <p>My VM implements it. And then I wrote this behaviour to synchronise editing state of DataGrid and my VM:</p> <pre><code> public class SynchroniseDataGridEditingStateBehaviour : Behavior&lt;DataGrid&gt; { public static readonly DependencyProperty EditingStateBindingProperty = DependencyProperty.Register("EditingStateBinding", typeof(ISupportEditingState), typeof(SynchroniseDataGridEditingStateBehaviour), new PropertyMetadata(OnEditingStateBindingPropertyChange)); private bool _attached; private bool _changingEditingState; public ISupportEditingState EditingStateBinding { get { return (ISupportEditingState)GetValue(EditingStateBindingProperty); } set { SetValue(EditingStateBindingProperty, value); } } private static void OnEditingStateBindingPropertyChange(DependencyObject d, DependencyPropertyChangedEventArgs e) { var b = d as SynchroniseDataGridEditingStateBehaviour; if (b == null) return; var oldNotifyChanged = e.OldValue as INotifyPropertyChanged; if (oldNotifyChanged != null) oldNotifyChanged.PropertyChanged -= b.OnEditingStatePropertyChanged; var newNotifyChanged = e.NewValue as INotifyPropertyChanged; if (newNotifyChanged != null) newNotifyChanged.PropertyChanged += b.OnEditingStatePropertyChanged; var newEditingStateSource = e.NewValue as ISupportEditingState; if (newEditingStateSource.EditingState == EditingState.Editing) { // todo: mh: decide on this behaviour once again. // maybe it's better to start editing if selected item is already bound in the DataGrid newEditingStateSource.EditingState = EditingState.LastCancelled; } } private static readonly string EditingStatePropertyName = CodeUtils.GetPropertyNameByLambda&lt;ISupportEditingState&gt;(ses =&gt; ses.EditingState); private void OnEditingStatePropertyChanged(object sender, PropertyChangedEventArgs e) { if (_changingEditingState || !_attached || e.PropertyName != EditingStatePropertyName) return; _changingEditingState = true; var editingStateSource = sender as ISupportEditingState; if (editingStateSource == null) return; var grid = AssociatedObject; var editingState = editingStateSource.EditingState; switch (editingState) { case EditingState.Editing: grid.BeginEdit(); break; case EditingState.LastCancelled: grid.CancelEdit(); break; case EditingState.LastCommitted: grid.CommitEdit(); break; default: throw new InvalidOperationException("Provided EditingState is not supported by the behaviour."); } _changingEditingState = false; } protected override void OnAttached() { var grid = AssociatedObject; grid.BeginningEdit += OnBeginningEdit; grid.RowEditEnded += OnEditEnded; _attached = true; } protected override void OnDetaching() { var grid = AssociatedObject; grid.BeginningEdit -= OnBeginningEdit; grid.RowEditEnded -= OnEditEnded; _attached = false; } void OnEditEnded(object sender, DataGridRowEditEndedEventArgs e) { if (_changingEditingState) return; EditingState editingState; if (e.EditAction == DataGridEditAction.Commit) editingState = EditingState.LastCommitted; else if (e.EditAction == DataGridEditAction.Cancel) editingState = EditingState.LastCancelled; else return; // if DataGridEditAction will ever be extended, this part must be changed EditingStateBinding.EditingState = editingState; } void OnBeginningEdit(object sender, DataGridBeginningEditEventArgs e) { if (_changingEditingState) return; EditingStateBinding.EditingState = EditingState.Editing; } } </code></pre> <p>Works ok for me, hope it helps.</p>
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    1. POEditing newly added row in Silverlight 3 DataGrid using MVVM
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    1. USnayato
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      1. VTUpMod
    1. COThanks for posting the code. I can't easily test it because I'm no longer working on that project, but if anyone else finds it useful perhaps they could comment here.
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