Linq其中值在Array中

Question

IEnumerable<string> periods = new string[] {"ABC", "JKD", "223A"};

var someData = from p in returns  
               from d in p.ReturnDet  
               where p.Year > 2009 
               where d.Period <is in periods array> 

如何选择句点数组中包含d.periods的值？

Answer 1

使用Contains方法。

var someData = from p in returns   
               from d in p.ReturnDet   
               where p.Year > 2009  
               where periods.Contains(d.Period);

Answer 2

var someData = from p in returns  
      from d in p.ReturnDet  
                where p.Year > 2009 
                where periods.Contains(d.Period)