报告 VS 2010，向下钻取 ICollection

Question

我有以下 Linq，它链接到报告。

恢复它是账单报告，但账单有多个产品，所以我有一个 ICollection 和 Products。我们的想法是使用向下钻取在单个报告中显示每个帐单及其多个 Products（尽量避免子报告）。

public class BillsDataSet
{
    public int IDGestion { get; set; }
    public string Comentario { get; set; }
    public ICollection<BillProduct> Products { get; set; }
    public decimal Monto { get; set; }
    public string Personal { get; set; }

    public static List<BillsDataSet> BillsPorFecha(DateTime dtFechaInicial, DateTime dtFechaFinal)
    {
        Context db = new Context();

        List<BillsDataSet> BillsDataSet = (from p in db.Bill
                                               select new BillsDataSet()
                                               {
                                                   IDGestion = p.IDBill,
                                                   Comentario = p.Historial.FirstOrDefault().Comentario,
                                                   Products = p.BillProduct,
                                                   Monto = p.Total,
                                                   Personal = p.Historial.FirstOrDefault().CodigoEmpleado
                                               }).ToList();
        return BillsDataSet;
    }
}

我在网页报告中收到此错误...

我想要实现的是深入了解Products 以隐藏/显示与账单相关的所有Products...

Answer 1

试试下面的

public static List<BillsDataSet> BillsPorFecha(DateTime dtFechaInicial, DateTime dtFechaFinal)
{
    Context db = new Context();

    List<BillsDataSet> BillsDataSet = (from p in db.Bill
                                           select new BillsDataSet()
                                           {
                                               IDGestion = p.IDBill,
                                               Comentario = p.Historial.FirstOrDefault().Comentario,
                                               Products = (from b in db.BillProduct where b.product_id == p.IDBill select new BillProduct()).ToList() as ICollection<BillProduct>,
                                               Monto = p.Total,
                                               Personal = p.Historial.FirstOrDefault().CodigoEmpleado
                                           }).ToList();
    return BillsDataSet;

}