WPF Binding to collection with constraint

I have an observable collection of objects. I wish to bind a gridview to this observable collection. But there is a constraint that only objects whose property x has value a, must be binded

How to do that?

I got it working using CollectionView and filter. For others benefit the code is as follows

Solution :

public class CustomerViewModel
    {       
       public ObservableCollection<Customer> Customers
       {
           get;
           set;
       }


       priva开发者_StackOverflowte ICollectionView _filteredCustomerView;
       public ICollectionView FilteredCustomers
       {
           get { return _filteredCustomerView; }
       }


       public CustomerViewModel()
       {
           this.Customers= new ObservableCollection<Customer>();               
           Customers= GetCustomer();
           _filteredCustomerView= CollectionViewSource.GetDefaultView(Customers);
           _filteredCustomerView.Filter = MyCustomFilter;

       }


       private bool MyCustomFilter(object item)
       {
           Customer cust = item as Customer;
           return (cust.Location == "someValue");

       }
    }

---

You should use filtering

---

I prefer using LINQ.

var result = YourCollection.Where(p => p.x.HasValue).ToObservableCollection();

But you should write your own extension to convert to ObservableCollection.

public static ObservableCollection<T> ToObservableCollection<T>
              (this IEnumerable<T> source)
{
    if (source == null)
        throw new ArgumentNullException("source");

    return new ObservableCollection<T>(source);
}

Good luck!

---

I think you could achieve this in XAML by putting a DataTrigger on the style of your GridView. Something like this:

<DataGrid>
    <DataGrid.Resources>
        <Style TargetType="{x:Type DataGridRow}">
            <DataTrigger Binding="{Binding IsFiltered}" Value="True">
                <Setter Property="Visibility" Value="Visible" />
            </DataTrigger>
            <DataTrigger Binding="{Binding IsFiltered}" Value="False">
                <Setter Property="Visibility" Value="Collapsed" />
            </DataTrigger>
        </Style>
    </DataGrid.Resources>
</DataGrid>