相关疑难解决方法(0)

我在BlogRepository中有这个

public IQueryable<Subnus.MVC.Data.Model.Post> GetPosts()
    {
        var query = from p in db.Posts
                    let categories = GetCategoriesByPostId(p.PostId)
                    let comments = GetCommentsByPostId(p.PostId)
                    select new Subnus.MVC.Data.Model.Post
                    {
                        Categories = new LazyList<Category>(categories),
                        Comments = new LazyList<Comment>(comments),
                        PostId = p.PostId,
                        Slug = p.Slug,
                        Title = p.Title,
                        CreatedBy = p.CreatedBy,
                        CreatedOn = p.CreatedOn,
                        Body = p.Body
                    };
        return query;
    }

和

public IQueryable<Subnus.MVC.Data.Model.Comment> GetCommentsByPostId(int postId)
    {
        var query = from c in db.Comments
                    where c.PostId == postId
                    select new Subnus.MVC.Data.Model.Comment
                    {
                        Body = c.Body,
                        EMail = …

"方法'布尔包含(System.String)'没有支持的SQL转换."

查询是IsQueryable但这停止了工作:

foreach (string s in collection1)
{
       if (s.Length > 0)
                {
                    query = query.Where(m => m.collection2.Contains(s));

                }
}

更新:当我使查询"ienumerable"而不是iqueryable时,它工作.使用linq而不是迭代循环获得相同结果的方法是什么？