使用实体框架linq从数据库结果中获取项目

Question

I have a schedule object that is returned from the database. It contains information from a few tables. One of the tables is called ScheduleData and has four columns. It has this format:

Id  |  ScheduleId |  Name  |  Value

I need the value of the fourth column where the Name is Mine and the ScheduleId is 5

I have tried this, but it doesn't work:

string val = from s in schedule.ScheduleData where s.Name.Equals("Mine") && s.ScheduleId == 5 select s.Value;

Answer 1

Use First method or FirstOrDefault method.The query returns an IEnumerable<T> , you can't assign it to string .

string val = (from s in schedule.ScheduleData 
             where s.Name == "Mine" && s.ScheduleId == 5 
             select s.Value).First();