Linq To SQL：为什么不起作用？

Question

为什么会从以下内容得到编译错误？

int[] threadIDs = { 4,5,6,7,8,9,10,11,12,13,14,15,16,17 };
CSDataContext db = new CSDataContext();
var posts = from p in db.cs_Posts, t in threadIDs
    where p.ThreadID == t
    select p.ThreadID;

Answer 1

你想做什么？ 选择列表中所有具有线程ID的帖子？

然后像这样的东西会工作

int[] threadIDs = {4,5,6,7,8,9,10,11,12,13,14,15,16,17};
CSDataContext db = new CSDataContext();
var posts = from p in db.cs_Posts
    where threadIds.Contains(p.ThreadID)
    select p.ThreadID;

Answer 2

你试过了吗

var posts = from p in db.cs_Posts
            from t in threadIDs
            where p.ThreadID == t
            select p.ThreadID;

省略逗号并添加另一个“来自”