Question

I have got the following code that produce an image. But I’m getting the an error message.

My code:

public ActionResult Index()
    {
        eCommerceEntities db = new eCommerceEntities();

        var orders = (from c in db.Orders
                      group c by c.PaymentTypeID into g
                      select new { PaymentTypeID = g.Key, Number = g.Count() });


        var bytes = new Chart(width: 600, height: 400)
           .AddTitle("Orders")
           .DataBindTable(dataSource: orders, xField: "PaymentTypeID") 
           .GetBytes("png");

        return File(bytes, "image/png");
    }

Error Message:

Specified method is not supported.

Stack Trace:

Thanks in advance.

Answer 1

It looks like the chart is trying to enumerate the LINQ query multiple times on one enumerator.

Call ToList() before passing the data to the chart.