如何使用LINQ to SQL編寫此代碼？

Question

在LINQ to SQL中，這個SQL查詢的等價物是什麼？

select * 
from Leads, LeadCustomAttributes LCA 
where Leads.LeadID = LCA.LeadID 
&& LCA.AttributeID in ('2','4','2') 

Answer 1

var query = 
    from lead in db.Leads 
    from lca in db.LeadCustomAttributes 
    where lead.LeadID == lca.LeadID 
    where new[] { "2", "4" }.Contains(lca.AttributeID) 
    select new { lead, lca }; 

Answer 2

int[] ids = { 2, 4, 2}; 

var result = from leads in context.Leads 
      join LCA in context.LeadCustomAttributes 
      ON leads.LeadID = LCA.LeadID 
      Where ids.Contains(ids.ContainsLeadCustomAttributes) 
      select leads;