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13482171
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2012-11-20T21:08:21.640
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2012-11-20T23:42:20.647
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2012-11-20T23:42:20.647
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ATTEMPT 1: In T4 Template that creates Entity classes, change NavigationProperty to: <pre><code>public string NavigationProperty(NavigationProperty navigationProperty) { var endType = _typeMapper.GetTypeName(navigationProperty.ToEndMember.GetEntityType()); return string.Format( CultureInfo.InvariantCulture, "{0}\n\n {1} {2} {3}\n {{\n {4}get\n {{\n return _{3}; \n }}\n {5} set\n {{\n _{3}=value; OnSet{3}();\n }}\n }}\n\n {6}", string.Format(CultureInfo.InvariantCulture, "{0} _{1};",_typeMapper.GetTypeName(navigationProperty.TypeUsage), _code.Escape(navigationProperty)), AccessibilityAndVirtual(Accessibility.ForProperty(navigationProperty)), navigationProperty.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many ? ("ICollection<" + endType + ">") : endType, _code.Escape(navigationProperty), _code.SpaceAfter(Accessibility.ForGetter(navigationProperty)), _code.SpaceAfter(Accessibility.ForSetter(navigationProperty)), string.Format(CultureInfo.InvariantCulture, "partial void OnSet{0}();", _code.Escape(navigationProperty))); } </code></pre> Then add in partial Entity1 Class: <pre><code>Partial Class Entity1:EntityBase { public SpecificObservableCollection<Entity2> Entity2_Observable { get; set; } partial void OnSetEntity2() { Misc_Observable.Add(Entity2); } public class SpecificObservableCollection<T> : ObservableCollection<T> { public Action<T> SetValue { get; set; } protected override void InsertItem(int index, T item) { if (item != null) { base.InsertItem(index, item); } } protected override void OnCollectionChanged(System.Collections.Specialized.NotifyCollectionChangedEventArgs e) { base.OnCollectionChanged(e); if (this.Count>0) SetValue(this[0]); } } protected override void DoStuffOnAdd() { Entity2_Observable = new SpecificObservableCollection<Entity2>(); Entity2_Observable.SetValue = a => _Entity2 = a; } } </code></pre> Then in EntityBase: <pre><code>public abstract class EntityBase { EntityBase() { DoStuffOnAdd(); } protected virtual void DoStuffOnAdd() { } } </code></pre> For IValueConverter (in order to avoid adding too many records in a 1:1 relationship) <pre><code>public class CanAddValueConverter : IValueConverter { private Type _T; private DataGrid _dg; public void SetValues(DataGrid dg, Type T) { _T = T; _dg = dg; } public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { System.Collections.IEnumerable dgIS = value as System.Collections.IEnumerable; if (_dg != null && dgIS == _dg.ItemsSource) { if (_dg.Items.Count > 0) return _dg.Items.Count <= System.Convert.ToInt32(parameter) && _dg.Items[_dg.Items.Count - 1].GetType() != _T; else return true; } else return false; } } </code></pre> then in CodeBehind, assign DataGrid to IValueConverter as well as corresponding Entity type.
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1. POBind DataGrid in WPF to child navigation property (EF) with 1:1 using MVVM
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