Question

我有一个名为Consult的sql表，它代表物理治疗师的咨询（治疗）

ConsultID ConsultDate Therapist Location

我想提供每周汇总的数据，从28周前开始直到本周

像：

Location     Week-1          Week-2          Week-3 .....      Week-28
Amsterdam    41              38              34                55

Utrecht      65              56              46                46

我如何在Linq中执行此操作？我有以下内容：

public ActionResult Therapist(int? id)
    {
        if (id == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }

        DateTime startDate = DateTime.Now.StartOfWeek(DayOfWeek.Monday).AddDays(-168);
        DateTime endDate = DateTime.Now.StartOfWeek(DayOfWeek.Sunday);

        var TherapistConsult = from row in db.Consults
                               where ((row.Therapist == id) && (row.ConsultDate > startDate) && (row.ConsultDate < endDate))
                                 group row by row.Location into g
                                 where g.FirstOrDefault() != null
                                 select new
                                 {
                                     Location = g.Key,
                                     // Need a loop here for 28 weeks in the past till this week
                                     // WeekN = g.Count(x => x.Week == N),

                                 };

        return View(TherapistConsult.ToList());

    }

Answer 1

您正在寻找的是“透视”您的数据，这从SQL然后从linq更容易实现，
在CodeProject中查找 http://www.codeproject.com/Tips/500811/Simple-Way-To-Use-Pivot-In-SQL-Query
如果你因为某种原因在linq中执行此操作，请查看以下内容：
Pivot data using LINQ

Linq每周的咨询人数，从过去的28周到本周

1 个答案: