DataTable GroupBy的用法
var result = dt.AsEnumerable(). GroupBy(g => new { StaffID = g.Field<string>("StaffID"), StaffName = g.Field<string>("StaffName"), ActivityDate = g.Field<string>("ActivityDate") }). Select(n => new DailyRouteDisplayItem { ActivityDate = n.Key.ActivityDate, StaffID = n.Key.StaffID, StaffName = n.Key.StaffName, RouteList = n.Select(x => new RouteDisplayItem { StaffID = x["StaffID"].ToString(), StaffName = x["StaffName"].ToString(), ActivityID = x["ActivityID"].ToString(), ActivityDate = x["ActivityDate"].ToString(), CheckinType = x["CheckinType"].ToString(), CheckinTime = x["CheckinTime"].ToString(), CheckinLat = ConvertObject.ToDecimal(x["CheckinLat"]), CheckinLng = ConvertObject.ToDecimal(x["CheckinLng"]), CheckoutType = x["CheckoutType"].ToString(), CheckoutTime = x["CheckoutTime"].ToString(), CheckoutLat = ConvertObject.ToDecimal(x["CheckoutLat"]), CheckoutLng = ConvertObject.ToDecimal(x["CheckoutLng"]) }).ToList() }).ToList();
数组GroupBy的用法
var result = list.GroupBy(n => new { n.ActivityDate, n.StaffID, n.StaffName }).Select(n => new DailyRouteDisplayItem { ActivityDate = n.Key.ActivityDate, StaffID = n.Key.StaffID, StaffName = n.Key.StaffName, RouteList = n.ToList() }).ToList();