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POMVVM Grouping Items in ListView
 

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    <p>I cannot understand what I'm doing wrong. I want to group items in listView. In result I want to see something like that:</p> <p><img src="https://i.stack.imgur.com/9zF5o.jpg" alt="enter image description here"></p> <p>It'm using MVVM pattern. It's my XAML code.</p> <pre><code>&lt;CollectionViewSource x:Key="EmploeeGroup" Source="{Binding Path=AllEmploees}"&gt; &lt;CollectionViewSource.GroupDescriptions&gt; &lt;PropertyGroupDescription PropertyName="FirstName" /&gt; &lt;/CollectionViewSource.GroupDescriptions&gt; &lt;/CollectionViewSource&gt; &lt;ListView AlternationCount="2" DataContext="{StaticResource EmploeeGroup}" ItemsSource="{Binding IsAsync=True}" Padding="0,0,0,10"&gt; &lt;ListView.GroupStyle&gt; &lt;GroupStyle&gt; &lt;GroupStyle.ContainerStyle&gt; &lt;Style TargetType="{x:Type GroupItem}"&gt; &lt;Setter Property="Margin" Value="0,0,0,5"/&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type GroupItem}"&gt; &lt;Expander IsExpanded="True" BorderBrush="#FFA4B97F" BorderThickness="0,0,0,1"&gt; &lt;Expander.Header&gt; &lt;DockPanel&gt; &lt;TextBlock FontWeight="Bold" Text="Name: "/&gt; &lt;TextBlock FontWeight="Bold" Text="{Binding Path=FirstName}"/&gt; &lt;/DockPanel&gt; &lt;/Expander.Header&gt; &lt;Expander.Content&gt; &lt;ItemsPresenter /&gt; &lt;/Expander.Content&gt; &lt;/Expander&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/GroupStyle.ContainerStyle&gt; &lt;/GroupStyle&gt; &lt;/ListView.GroupStyle&gt; &lt;ListView.View&gt; &lt;GridView&gt; &lt;GridViewColumn Width="150" Header="FirstName" DisplayMemberBinding="{Binding Path=FirstName}"/&gt; &lt;GridViewColumn Width="150" Header="LastName" DisplayMemberBinding="{Binding Path=LastName}"/&gt; &lt;/GridView&gt; &lt;/ListView.View&gt; &lt;/ListView&gt; </code></pre> <p>It's my <strong>EmploeeListViewModel.cs</strong></p> <pre><code>public class EmploeeListViewModel: ViewModelBase { readonly EmploeeRepository _emploeeRepository; private ObservableCollection&lt;EmploeeViewModel&gt; _allmpl; public ObservableCollection&lt;EmploeeViewModel&gt; AllEmploees { get { if (_allmpl == null) { _allmpl = new ObservableCollection&lt;EmploeeViewModel&gt;(); CreateAllEmploee(); } return _allmpl; } } public EmploeeListViewModel(EmploeeRepository emploeeRepository) { if (emploeeRepository == null) throw new ArgumentNullException("emploeeRepository"); _emploeeRepository = emploeeRepository; _emploeeRepository.EmploeeAdded += this.OnEmploeeAddedToRepository; } private void CreateAllEmploee() { List&lt;EmploeeViewModel&gt; all = (from emploee in _emploeeRepository.GetEmploees() select new EmploeeViewModel(emploee)).ToList(); foreach (EmploeeViewModel evm in all) { evm.PropertyChanged += this.OnEmploeeViewModelPropertyChanged; AllEmploees.Add(evm); } this.AllEmploees.CollectionChanged += this.OnCollectionChanged; } //this.OnCollectionChanged; //this.OnEmploeeViewModelPropertyChanged; } </code></pre> <p><strong>EmploeeViewModel.cs</strong></p> <pre><code>public class EmploeeViewModel : ViewModelBase { #region Fields Emploee _emploee; bool _isSelected; #endregion #region Constructor public EmploeeViewModel(Emploee emploee) { if (emploee == null) throw new ArgumentNullException("emploee"); this._emploee = emploee; } #endregion #region Emploee Properties public bool IsSelected { get { return _isSelected; } set { if (value == _isSelected) return; _isSelected = value; base.OnPropertyChanged("IsSelected"); } } public string FirstName { get { return _emploee.FirstName; } set { if (value == _emploee.FirstName) return; _emploee.FirstName = value; base.OnPropertyChanged("FirstName"); } } public string LastName { get { return _emploee.LastName; } set { if (value == _emploee.LastName) return; _emploee.LastName = value; base.OnPropertyChanged("LastName"); } } #endregion } </code></pre> <ul> <li>Why can not I bind "FirstName" property with Expander.Header TextBlock? </li> <li>Why have I object type<br> MS.Internal.Data.CollectionViewGroupInternal inside Expander.Header(if i wrote inside Expander.Header Text="{Binding}")>?</li> </ul> <p>How should I change my XAML or .CS code to produce <a href="https://i.stack.imgur.com/9zF5o.jpg" rel="noreferrer">these results</a>?</p>
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