WPF SelectedItem not working in MVVM
datagrid, mvvm, selecteditem, wpf
Solution
You need a setter for SelectedItem
private Models.Customers _selecteditem;
public Models.Customers SelectedItem
{
get { return _selecteditem; }
set { _selectedItem = value; }
}
Also, since you are using it in a binding you'll want the ViewModel to implement INotifyPropertyChanged so it'll actually be:
private Models.Customers _selecteditem;
public Models.Customers SelectedItem
{
get { return _selecteditem; }
set
{
if (_selectedItem != value)
{
_selectedItem = value;
NotifyPropertyChanged("SelectedItem");
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(String info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}
Problem
I'm trying to display the data from two sql ce 3.5 sp1 database tables linked with foreign key - Customers and Orders. When the customer is selected in a datadrig, I want the other grid to be populated with the Orders. I'm using a query: ``` var profiles = from c in db.Customers.Include("Orders") select c; ``` And in my ViewModel: ``` private Models.Customers _selecteditem; public Models.Customers SelectedItem { get { return _selecteditem; } } ``` the view looks like this: ``` <Grid> <toolkit:DataGrid x:Name="dg1" ItemsSource="{Binding Customers}" SelectedItem="{Binding SelectedItem, mode=TwoWay}"> </toolkit:DataGrid> <toolkit:DataGrid x:Name="dg2" ItemsSource="{Binding Path=SelectedItem.Orders}"> </toolkit:DataGrid> </Grid> ``` The error I'm getting is: ``` Warning 1 Field 'Clients.ViewModels.CustomerViewModel._selecteditem' is never assigned to, and will always have its default value null ``` How to make it work correctly? When I just want to display Customers it is ok. Thanks for any suggestions.