Object does not match target type in GridView
I created a shopping cart for a website that can display multiple types of items that implement IShoppingCartItem. When the GridView would display items that were different type, I would get this exception:
Exception Details: System.Reflection.TargetException: Object does not match target type.
I found a lot of solutions that I didn’t really like. For example, every shopping cart item type could implement ITypedList.
What I ended up doing was creating a CartGridItem class that implements IShoppingCartItem:
public class CartGridItem : IShoppingCartItem
{
private readonly IShoppingCartItem _baseCartItem;
public CartGridItem(IShoppingCartItem baseCartItem)
{
_baseCartItem = baseCartItem;
}
#region IShoppingCartItem Members
public string ProductCode
{
get { return _baseCartItem.ProductCode; }
}
//...end of code sample...
This has worked great, and I don’t have to make any changes when I create a new item that implements that interface!
Troy Dahnert said,
Wrote on November 17, 2010 @ 10:53 pm
If all you needed to do was display in the gridview you could also do the following which would be faster.
var source = from c in CartItems
select new {ProductCode = ProductCode}
gridView.DataSource = source;
gridView.DataBind();