摘要： var langCount = (from s in GetStudents()select s.Language).Distinct().Count();Response.Write(string.Format("<div class='result'>{0}</div>", langCount));#endregion#region 用Count()的Lambda表达式满足条件的元素个数Response.Write("<hr>用Count()得出查询结果的个数<br>");var age 阅读全文