查询动态Linq

Question

我需要创建一个动态查询，其中变量DayOfWeek.Monday是动态的，我该如何设置？

DataClassesPDataContext pe = new DataClassesPDataContext();
var qry = from p in pe.R
          join q in pe.V on p.V equals q.V_
          where p.Data < data 
          where q.I == `v`
          where p.Data.DayOfWeek == `DayOfWeek.Monday`
          select(p.Q);

return qry.ToList().Average();

Answer 1

您可以将DayOfWeek提取到变量

中

var day = DayOfWeek.Monday;

var qry = ...
      where p.Data.DayOfWeek = day

但请注意。如果您对DayOfWeek

执行查询，则无法使用Entity Framework