Question

I have the following classes…

public class Order
{
    private Guid id;
    public Guid ID
    {
        get { return id; }
        set { id = value; }
    }

    private List<Items> orderItems;
    public List<Items> OrderItems
    {
        get { return orderItems; }
        set { orderItems= value; }
    }

}

public class Item
{

    private Guid id;
    public Guid ID
    {
        get { return id; }
        set { id = value; }
    }

    private string itemName;
    public string ItemName
    {
        get { return itemName; }
        set { itemName = value; }
    }

}

Then within my application I try the following….

ACME.Order newOrder = new ACME.Order();
newOrder.ID = xxx
newOrder.OrderItems = new List<OrderItem> {
     new ACME.OrderItem {
         ID = xxx
         ItemName = xxx
     }
}

However I get the error “Cannot implicitly convert type 'System.Collections.Generic.List<ACME.Item>' to ACME.Item[]. The strange thing as well is that all I don’t have an “Add” option on any of my list objects.

Answer 1

Is your application on the client side of a Web service?

If so, the proxy generator for .asmx and WCF Web services generates an array T[] on the client side where a service interface uses a List<T> (or, indeed, any other enumerated type).

Your application will need to cast the list to an array (use .ToArray()) to set the array property client-side.