使用Any扩展名:

var myProducts =
    from rp in recommendations
    where
        cp.Products.Any(p => p.Product.Code == "A") &&
        cp.Products.Any(p => p.Product.Code == "B")
    select rp;

如果序列中有任何匹配内部条件的元素，则

Any返回true.在这种情况下，您要搜索两个元素，因此需要两个Any调用.

Any returns true if there are any elements in the sequence that match the inner condition. In this case you're searching for two elements, so it takes two Any calls.