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Question

我有一个窗口表单，包含2个datagridview，customer和order。当客户单元格被双击时，我想获取当前行customerID并查询具有相同customerID的nw.orders。不幸的是，LINQ结果总是返回空。我可能哪个部分做错了？或者是否有其他替代方法来检索该特定客户的订单？感谢您提前查看和建议。

public partial class CustomerOrder : Form
{
    northwindEntities nw;

    public CustomerOrder()
    {
        InitializeComponent();
    }

    private void CustomerOrder_Load(object sender, EventArgs e)
    {
        nw = new northwindEntities();
        customerBindingSource.DataSource = nw.Customers;
    }

    private void customerDataGridView_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
    {
        string CustID = (string)customerDataGridView.Rows[e.RowIndex].Cells[1].Value;

        ordersBindingSource.DataSource = from order in nw.Orders
                                         where order.Customer.CustomerID == CustID
                                         select order;
    }
}