如何在MVVM（WPF）中刷新Devexpress GridControl ItemsSource（作为数据表）

Question

I have a GridControl(Devexpress v13) in view(WPF). A Datatable set values in ViewModel and assigned to ItemsSource. But ItemsSource filled only initialize. Later Datatable's value changes but it doesn't refresh. How to ItemsSource refresh?

<dxg:GridControl Name="GridControlData" DataSource="{Binding DtCriterias, Mode=TwoWay}" HorizontalAlignment="Left" VerticalAlignment="Top" AutoGenerateColumns="AddNew" Width="400" Height="100">

I hope you know what I mean. Any help will be much appreciated.

Thanks in advance.

Edit: Property changed using:

 public DataTable DtCriterias {
            get { return _dtCriterias; }
            set
            {
                _dtCriterias = value;
                Notify(() => DtCriterias);
            }
        }

protected void Notify(Expression<Func<object>> expression)
        {

            if (_propertyChangedEvent == null) return;

            Notify(GetPropertyName(expression));
        }

protected void Notify(string propertyName)
        {
            if (_propertyChangedEvent != null)
            {
                _propertyChangedEvent(this, new PropertyChangedEventArgs(propertyName));
            }
        }

Answer 1

public ObservableCollection<ClientB2B> Clients
{
    get
    {
        return _clients;
    }
    set
    {
        if (_clients == value) return;
        _clients = value;
        OnPropertyChanged(); // This is what you need
    }
}

Implement this interface - INotifyPropertyChanged

protected void OnPropertyChanged(PropertyChangedEventArgs e)
{
    PropertyChangedEventHandler handler = PropertyChanged;
    if (handler != null)
        handler(this, e);
}

protected void OnPropertyChanged(string propertyName)
{
    OnPropertyChanged(new PropertyChangedEventArgs(propertyName));
}

public event PropertyChangedEventHandler PropertyChanged;

Answer 2

I found reason of problem. I am using encapsulation and I was set private value(_dtCriterias). Therefore Property Changed Event wasn't work.

Definitions:

private DataTable _dtCriterias;

public DataTable DtCriterias {
    get { return _dtCriterias; }
    set
    {
        _dtCriterias = value;
        Notify(() => DtCriterias);
    }
}

When I have problem datatable set:

_dtCriterias = GetValue().DefaultView.ToTable("FooTable");

Solution:

DtCriterias = GetValue().DefaultView.ToTable("FooTable");