0
如何,我想绑定我的2我的下拉列表基于ProductID,它的可用大小和可用的颜色,因此,如果用户选择灰色说,只有大小可用灰色将出现,反之亦然大小。我正在尝试下面的linq语句,显然它会抛出“LINQ to Entities does not recognized the method'System.String ToString()'method”,我不确定linq构造是否正确。任何人都可以请指教?谢谢。嵌套linq选择
if (!Page.IsPostBack)
{
using (CommerceEntities db = new CommerceEntities())
{
int tempNum; // ----> The ProductId
if (Int32.TryParse(litTypeSel.Text, out tempNum))
{
if ((ddlColor.SelectedValue == "") && (ddlSize.SelectedValue == ""))
{
ddlColor.DataSource = (from p in db.ProductTypes
where p.ProductID == tempNum && (p.Size == (from s in db.ProductTypes select s.Size).ToString())
orderby p.Color
select new { p.Color }).Distinct();
ddlColor.DataTextField = "Color";
ddlColor.DataBind();
ddlColor.Items.Insert(0, new ListItem("Select Color", "NA"));
ddlSize.DataSource = (from p in db.ProductTypes
where p.ProductID == tempNum && (p.Color == (from c in db.ProductTypes select c.Color).ToString())
orderby p.Size descending
select new { p.Size }).Distinct();
ddlSize.DataTextField = "Size";
ddlSize.DataBind();
ddlSize.Items.Insert(0, new ListItem("Select Size", "NA"));
}
}
}
}