Silverlight Datagrid不能正确显示数据

所以我做了一个数据网格在银自动生成列。我调用一个填充这个数据网格的WCF服务。它显示除两个列外的所有列。有人知道这是什么原因吗?

这个函数填满了我的类它的边界是

  public List<LightOrder> GetOrder(string code)
    {
        // Add your operation implementation here
        using (amazonproscoutEntities context = new amazonproscoutEntities())
        {
            return (from c in context.AmazonSKUs
                    where c.MerchantSKU.StartsWith(code)
                    select new LightOrder()
                    {
                        SKU = c.MerchantSKU,
                        productname = c.ItemName,
                        asin = c.ASIN,
                        //ourprice = c.OurPrice,
                        bbprice = c.Price,
                        quantity = c.TotalQty,
                        rank = c.Rank,
                        amazon = c.Amazon,
                        afner = c.AFNer
                        //w1 = c.w1
                    }
                    ).Take<LightOrder>(500).ToList<LightOrder>();
        }
    }

这是绑定数据网格的类:

public class LightOrder
{
    public string SKU { get; set; }
    public string productname { get; set; }
    public string itemnumber { get; set; }
    public string asin { get; set; }
    public string amazon { get; set; }
    public decimal ourprice { get; set; }
    public string bbprice { get; set; }
    public int w1 { get; set; }
    public string w2 { get; set; }
    public string w3 { get; set; }
    public string w4 { get; set; }
    public int quantity { get; set; }
    public string pendingorder { get; set; }
    public string afner { get; set; }
    public string order { get; set; }
    public string total { get; set; }
    public string profit { get; set; }
    public string percent { get; set; }
    public string rank { get; set; }
}