Question

Scenario:

Parent-child relationship between CustomerOrders & CustomerOrderItems in db.

Both CustomerOrders and CustomerOrderItems are defined in the auto-generated Linq2Sql dbml class.

MVC Code:

I have a view model class:

public class OrdersListViewModel
{
    public IEnumerable<CustomerOrder> CustomerOrders { get; set; }
    public PagingInfo PagingInfo { get; set; }
}

which passes data to a partial view (only interested in the CustomerOrders data):

@model CallTracking.Domain.Concrete.CustomerOrder
<tr>
    <td>@Model.Auto_ID</td>
    <td>@Model.OrderTotal</td>
    <td>@string.Format("{0} {1}", Model.CustomerFirstName, Model.CustomerSecondName)</td>
    <td>@Model.Email</td>
    **<td>@Model.CustomerOrderItems.OrderByDescending(i => i.SalesPrice).FirstOrDefault().ItemName</td>**
</tr>

This works fine, the problem is that I’ve used a Linq expression in order to display the highest value orderitem for each order record, but I feel (and have read) that I shouldn’t use Linq in the view and this should be a property in the view model i.e.

public CustomerOrderItem HighestValueOrderItem { get; set; }

It’s at this point where I get stuck – how & where would I set this value?

Answer 1

In CustomerOrder Model Create Property Called

private CustomerOrderItem _HighestValueOrderItem = null;
public CustomerOrderItem HighestValueOrderItem { 
get{
   if(this.CustomerOrderItems.Any() && _HighestValueOrderItem != null){
        _HighestValueOrderItem =  this.CustomerOrderItems.OrderByDescending(i => i.SalesPrice).FirstOrDefault();
        return  _HighestValueOrderItem;
   } else {
      return new CustomerOrderItem();
   }
}
}