使用 group by 从一个包含批量记录的表中获取一些统计数据并将结果放入第二个表中

Question

As I explained in title I have 2 tables: 1 - "Leaves" with 21000 rec of leaves for about 50 peoples during 20 years 2- "StatisticLeave" which is empty now i want to use group by for getting some statistic data from table 1 and after doing some calculation (like sum &...) putting the results into the second table. I wrote below code:

public ActionResult UserStatistic()
    {
        
        var ST = new List<StatisticLeave>();
        var resuls = db.Leaves.GroupBy(p => p.Pcode);
        foreach (var Pcode in resuls)
        {
            var statistic = new StatisticLeave();
            foreach (var item in Pcode)
            { 
                var used = UsedLeaves(item.Pcode);
                var estelaji = db.Leaves.Where(p => p.DLT == Leave.DLType.Estelaji).Sum(p => p.LeaveDays);
                var bh = db.Leaves.Where(p => p.DLT == Leave.DLType.Bihoghoogh).Sum(p => p.LeaveDays);               
                statistic.Yearlyhours = ViewBag.mins/60;
                statistic.YearlyDays = ViewBag.days;
                statistic.YearEstelaji = estelaji;
                statistic.YearBihoghoogh = bh;
                statistic.Pcode = item.Pcode;
                statistic.Year = item.HijriYear;
                statistic.UsedYearLaeve = (used / 60) / 8;
                ST.Add(statistic);
            }
            db.StatisticLeave.AddRange(ST);
        }
        db.SaveChanges();
        return View();
    }

when I trace the code i get the following caution:

"System.InvalidOperationException HResult=0x80131509 Message=Unable to translate the given 'GroupBy' pattern. Call 'AsEnumerable' before 'GroupBy' to evaluate it client-side."

would you please tell me where is the problem or how can i fix it.

Answer 1

I changed my code as below and the problem Solved

public ActionResult UserStatistic(Int32? PCode)
{
    var ST = new List<StatisticLeave>();
    var results = db.Leaves.Where(p => p.Pcode == PCode).ToLookup(p => p.HijriYear);
    foreach (var HijriYear in results)
    {
        var statistic = new StatisticLeave();
        
        foreach (var item in HijriYear)
        {
            var used = UsedLeaves(item.Pcode, item.HijriYear);
            var estelaji = db.Leaves.Where(x => x.Pcode == item.Pcode).Where(p => p.DLT == Leave.DLType.Estelaji).Where(p => p.HijriYear == item.HijriYear).Sum(p => p.LeaveDays);
            var bh = db.Leaves.Where(x => x.Pcode == item.Pcode).Where(p => p.DLT == Leave.DLType.Bihoghoogh).Where(p => p.HijriYear == item.HijriYear).Sum(p => p.LeaveDays);                  
            statistic.Yearlyhours = ViewBag.mins / 60;
            statistic.YearlyDays = ViewBag.days;
            statistic.YearEstelaji = estelaji;
            statistic.YearBihoghoogh = bh;
            statistic.Pcode = item.Pcode;
            statistic.Year = item.HijriYear;
            statistic.UsedYearLaeve = (used / 60) / 8;
            ST.Add(statistic);
        }
        db.StatisticLeave.AddRange(ST);
    }
    db.SaveChanges();
    return View();
}