Próbuję zaimplementować moją pierwszą aplikację MVVM. Mogłem powiązać dane w datagrid, ale zmiany, które wprowadzam w elementach, nie uruchamiają metody RaisePropertyChanged modelu.

To jest My ViewModel

    public class UsersViewModel : BaseViewModel
{
    private static TOPEntities _context;
    private ObservableCollection<UserModel> _usersCollection;

           public UsersViewModel()
    {
        _usersCollection = new ObservableCollection<UserModel>(GetAllUsers());

    }
          public ObservableCollection<UserModel> UsersCollection
    {
        get { return _usersCollection; }
        set
        {
            if (_usersCollection != value)
            {
                _usersCollection = value;
                RaisePropertyChanged(() => UsersCollection);
            }
        }
    }
public static List<UserModel> GetAllUsers()
    {
        using (_context = new TOPEntities())
        {

            return _context.Users.Select
             (user => new UserModel
             {
                 Id_User = user.Id_User,
                 Name = user.Name,
                 Username = user.Username,
                 Language = user.Language,
                 Password = user.Password,
                 Profile = user.Profile

             }).ToList();

        }
    }

Model implementuje klasę NotificationObject, która udostępnia zmienną INotifyPropertyChanged

    public class UserModel : NotificationObject
{
    #region Construction
    /// Constructs the default instance of a UserModel
    public UserModel()
    {

    }
    #endregion

    #region Model Attributes

    private int _id_User;
    private string _username;
    private string _password;
    private string _profile;
    private string _name;
    private string _language;

    #endregion

    #region Properties



    public int Id_User
    {
        get { return _id_User; }
        set
        {
            if (_id_User != value)
            {
               _id_User = value;
               RaisePropertyChanged(() => Id_User);
            }
        }
    }


    public string Username
    {
        get { return _username; }
        set
        {
            if (_username != value)
            {
                _username = value;
                RaisePropertyChanged(() => Id_User);
            }
        }
    }

    public string Password
    {
        get { return _password; }
        set
        {
            if (_password != value)
            {
                _password = value;
                RaisePropertyChanged(() => Id_User);
            }
        }
    }

    public string Profile
    {
        get { return _profile; }
        set
        {
            if (_profile != value)
            {
                _profile = value;
                RaisePropertyChanged(() => Id_User);
            }
        }
    }

    public string Name
    {
        get { return _name; }
        set
        {
            if (_name != value)
            {
                _name = value;
                RaisePropertyChanged(() => Name);
            }
        }
    }

    public string Language
    {
        get { return _language; }
        set
        {
            if (_language != value)
            {
                _language = value;
                RaisePropertyChanged(() => Language);
            }
        }
    }

    #endregion


}

}

I wreszcie widok:

<Window x:Class="TOP2.Views.UsersView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    xmlns:viewModels="clr-namespace:TOP2.ViewModels"
    xmlns:local="TOP2"
    Title="Sample App"
    WindowStartupLocation="CenterScreen"
    Height="459"
    Width="795">
<Window.Resources>
    <viewModels:UsersViewModel x:Key="Windows1ViewModel" />
</Window.Resources>
<Grid DataContext="{StaticResource Windows1ViewModel}">
    <DataGrid ItemsSource="{Binding UsersCollection, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" AutoGenerateColumns="False" HorizontalAlignment="Left" Margin="81,51,0,0" VerticalAlignment="Top" Height="332" Width="622">
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding Username, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
            <DataGridTextColumn Binding="{Binding Name, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
        </DataGrid.Columns>

    </DataGrid>

</Grid>

Co zapominam lub co robię źle?

Z góry dziękuję!

Oscar