SELECT b.*FROM aJOIN b ON a.id=b.id OR b.age=1
有个or哦
<a,b> (a,b)=>new JoinQueryInfos(JoinType.Left, a.id == b.id || b.age==1)).ToList()
var q = from b in B from a in A where ( a.id == b.id || b.age == 1 ) select b;