使用 group by 从一个带有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

问题描述

正如我在标题中所解释的，我有 2 个表： 1 - “叶子”在 20 年内为大约 50 人提供了 21000 片叶子 2- "StatisticLeave" 为空 现在我想使用 group by 从表 1 中获取一些统计数据，并在进行一些计算（如 sum & ...）后将结果放入第二个表中。 我写了下面的代码：

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();
    }

当我跟踪代码时，我得到以下警告：

"system.invalidOperationException HResult=0x80131509 Message=无法翻译给定的“GroupBy”模式。在“GroupBy”之前调用“AsEnumerable”以在客户端对其进行评估。”

请告诉我问题出在哪里或我该如何解决。

解决方法

我改变了我的代码如下，问题解决了

   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();
    }