sql - 如何使用 LINQ to SQL 编写此代码？

Question

LINQ to SQL 中这个 SQL 查询的等价物是什么？

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;