Linq Where value is in Array

IEnumerable<string> periods 开发者_高级运维= 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> 

How do I select values where the d.periods are contained in the periods array?

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Use the Contains method.

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

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