Lambda问题
var query = from a in data1
join b in data2 on b.xxx equals a.xxx
...

如果我想让b.xxx>=a.xxx连接，而不是相等，怎么写？
[解决办法]
var query = data1.Select(x => new { x, y = data2.Where(z => z.xxx >= x.xxx)});
[解决办法]
on 是结合条件。看你这需求应该用 where