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POUnable to track SelectedItem of DataGrid inside RowDetailsTemplate of another Datagrid
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  1. POUnable to track SelectedItem of DataGrid inside RowDetailsTemplate of another Datagrid
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    copied!<p>I ran into this problem earlier today and am unable to find a solution. The <code>SelectedItem</code> of a <code>DataGrid</code> that's inside the <code>RowDetailsTemplate</code> of another <code>DataGrid</code> is not being set when I select a row inside the <code>DataGrid</code> that's inside the <code>RowDetailsTemplate</code>. (Difficult to explain clearly.)</p> <p>The bindings are all working properly for the lists. The MainViewModel contains an <code>ObservableCollection</code> of <code>MyItem</code> objects and that's what the outer <code>DataGrid</code> binds to. </p> <p>The <code>MyItem</code> object contains an <code>ObservableCollection</code> of <code>MyItem2</code> objects and they get bound correctly to the inner <code>DataGrid</code>. </p> <p>The <code>MyItem</code> object also has a property called <code>SelectedItem2</code> which is supposed to be bound to the <code>SelectedItem</code> of the inner <code>DataGrid</code> but never gets set.</p> <p>BTW: I'm using VS2012 and .Net 4.5.</p> <p>Example:</p> <p><code>MainWindow.xaml</code></p> <pre><code>&lt;Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:wpfApplication1="clr-namespace:WpfApplication1" Title="MainWindow" Height="350" Width="525"&gt; &lt;Window.Resources&gt; &lt;wpfApplication1:MainWindowViewModel x:Key="MainVm"/&gt; &lt;/Window.Resources&gt; &lt;Grid DataContext="{StaticResource MainVm}"&gt; &lt;DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Path=MyItem1s}"&gt; &lt;DataGrid.Columns&gt; &lt;DataGridTextColumn Header="Name" Width="*" Binding="{Binding Path=Name}"/&gt; &lt;/DataGrid.Columns&gt; &lt;DataGrid.RowDetailsTemplate&gt; &lt;DataTemplate&gt; &lt;DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Path=Item2s}" SelectedItem="{Binding Path=SelectedItem2}"&gt; &lt;DataGrid.Columns&gt; &lt;DataGridTextColumn Header="Item 2 Name" Width="130" Binding="{Binding Path=Name}"/&gt; &lt;/DataGrid.Columns&gt; &lt;/DataGrid&gt; &lt;/DataTemplate&gt; &lt;/DataGrid.RowDetailsTemplate&gt; &lt;/DataGrid&gt; &lt;/Grid&gt; </code></pre> <p></p> <p><code>MainWindowViewModel</code></p> <pre><code> public class MainWindowViewModel : ViewModelBase { public MainWindowViewModel() { for (int i = 0; i &lt; 10; i++) { var item1 = new MyItem1(); item1.Name = i.ToString(); for (int j = 11; j &lt; 20; j++) item1.Item2s.Add(new MyItem2() { Name = j.ToString() }); MyItem1s.Add(item1); } } private ObservableCollection&lt;MyItem1&gt; _myItem1S = new ObservableCollection&lt;MyItem1&gt;(); public ObservableCollection&lt;MyItem1&gt; MyItem1s { get { return _myItem1S; } set { _myItem1S = value; } } } </code></pre> <p><code>MyItems ViewModels</code></p> <pre><code> public class MyItem1 : ViewModelBase { private string _name; public string Name { get { return _name; } set { _name = value; OnPropertyChanged("Name"); } } private ObservableCollection&lt;MyItem2&gt; _item2S = new ObservableCollection&lt;MyItem2&gt;(); public ObservableCollection&lt;MyItem2&gt; Item2s { get { return _item2S; } set { _item2S = value; OnPropertyChanged("Item2s"); } } private MyItem2 _selectedItem2; public MyItem2 SelectedItem2 { get { return _selectedItem2; } set { _selectedItem2 = value; OnPropertyChanged("SelectedItem2"); } } } public class MyItem2 : ViewModelBase { private string _name; public string Name { get { return _name; } set { _name = value; OnPropertyChanged("Name"); } } } </code></pre> <p><code>ViewModelBase</code></p> <pre><code>public class ViewModelBase : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; public void OnPropertyChanged(string property) { if(PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(property)); } } </code></pre> <p>Any Help would be appreciated. </p> <p>Thanks!</p>
 

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