如何将LINQ数据绑定到下拉列表

此代码的最后两行无法正常工作 – 结果将从LINQ查询返回。 我只是不确定如何成功地将结果中指示的列绑定到下拉列表的textfield和valuefield：

protected void BindMarketCodes() { List mcodesList = new List(); LINQOmniDataContext db = new LINQOmniDataContext(); var mcodes = from p in db.lkpMarketCodes orderby 0 select p; mcodesList = mcodes.ToList(); //bind to Country COde droplist dd2.DataSource = mcodesList; dd2.DataTextField = mcodesList[0].marketName; dd2.DataValueField = mcodesList[0].marketCodeID.ToString(); } 

Answer 1

请参阅下面的修订代码

 protected void BindMarketCodes() { using (var dataContext = new LINQOmniDataContext()) { //bind to Country COde droplist dd2.DataSource = from p in dataContext.lkpMarketCodes orderby p.marketName select new {p.marketCodeID, p.marketName}; dd2.DataTextField = "marketName"; dd2.DataValueField = "marketCodeID"; dd2.DataBind(); } } 

Answer 2

 protected void BindMarketCodes() { using(var dc = new LINQOmniDataContext()) { dd2.DataSource = from p in db.lkpMarketCodes orderby 0 select new {p.marketName, p.marketCodeID }; dd2.DataTextField = "marketName"; dd2.DataValueField = "marketCodeID"; dd2.DataBind(); } } // no need to use ToList() // no need to use a temp list; // using an anonymous type will limit the columns in your resulting SQL select // make sure to wrap in a using block; 

Answer 3

 DropDownList ddl_RouteLocation = (DropDownList)e.Row.FindControl("ddl_RouteLocation"); ddl_RouteLocation.DataSource = dtLocation;--(dtlocation i have return method of linq in dtlocation) ddl_RouteLocation.DataTextField =dtLocation.Rows[0]"LocationName"].ToString(); ddl_RouteLocation.DataValueField =dtLocation.Rows[0]["LocationId"].ToString(); ddl_RouteLocation.DataBind(); ddl_RouteLocation.Items.Insert(0, new ListItem("--Select--", "0"));