Code
        /// <summary>
        /// 根据多条件的查询
        /// </summary>
        /// <param name="Title">帖子标题</param>
        /// <param name="Author">帖子的作者</param>
        /// <param name="FBSJStar">开始时间</param>
        /// <param name="FBSJEnd">最后时间</param>
        /// <param name="IsTop">是否居顶</param>
        /// <returns></returns>
        public IList<TitleList> SelectTitle(String Title, String Author, String  FBSJStar, String FBSJEnd, String IsTop)
        {
            using(SXWEntities sxw=new SXWEntities())
            {

                var q = from p in sxw.TitleList
                        where  (string.IsNullOrEmpty(Title) ? true : p.Title.Contains(Title))
                            && (string.IsNullOrEmpty(Author) ? true : p.Author.Contains(Author))
                            && (string.IsNullOrEmpty(FBSJStar) ? true : p.FBSJ >= (Convert.ToDateTime(FBSJStar)))
                            && (string.IsNullOrEmpty(FBSJEnd) ? true : p.FBSJ <= (Convert.ToDateTime(FBSJEnd)))
                            && (string.IsNullOrEmpty(IsTop) ? true : p.IsTop == (Convert.ToInt32(IsTop)))
                        select p;
                return q.ToList();
            }
           
        }