Question

I am trying to fill a datagrid (called dgDeelnemers) with the data from my databank, which I get using the following LINQ method.

[OperationContract]
public IEnumerable<Inschrijvingen> getInschrijvingen()
{
    var query = (from p in dc.Inschrijvingens select p);

    IEnumerable<Inschrijvingen> i = query;

    return i;
}

And then I assign the data to my datagrid in the view using the following code.

  public partial class Deelnemers : UserControl
    {
        public Deelnemers()
        {
            InschrijvingenServiceClient client = new InschrijvingenServiceClient();

            client.getInschrijvingenCompleted += new EventHandler<getInschrijvingenCompletedEventArgs>(client_getInschrijvingenCompleted);
            client.getInschrijvingenAsync();
        }

        void client_getInschrijvingenCompleted(object sender, getInschrijvingenCompletedEventArgs e)
        {

            if (e.Error != null)
                lblDeelnemers.Content = e.Error.ToString();
            else
                dgDeelnemers.ItemsSource = e.Result;
        }
    }

But when I navigate to the page I get the following error:

Object reference not set to an instance of an object. at
OndernemersAward.Views.Deelnemers.client_getInschrijvingenCompleted(Object
sender, getInschrijvingenCompletedEventArgs e) at
OndernemersAward.InschrijvingenServiceReference.InschrijvingenServiceClient.OngetInschrijvingenCompleted(Object
state)

I’m not sure what’s causing this, but the return value of ‘i’ I think is correct.

Thank you for taking your time to read this and help me, I greatly appreciate it!
Thomas

Answer 1

You don’t have InitializeComponent()

(taken from my comment) 🙂