/// <summary> /// 获取有作业数据的学生集合。 /// </summary> /// <returns></returns> public LocalStudents HasWorks() { if (this.Students != null && this.Students.Count > 0) { LocalStudents stus = new LocalStudents(); for (int i = 0; i < this.Students.Count; i++) { LocalStudent ls = this.Students[i]; if (ls != null && ls.HasWork()) { stus.Add(ls); } } stus.Sort(); return stus; } return null; }