/// <summary>
/// 指定学生是否正在参与学习
/// </summary>
/// <param name="studentId"></param>
/// <returns></returns>
public bool HasStudy(long studentId)
{
return(StudentIds.Any(m => m == studentId));
}
/// <summary>
/// 获取正在参与学习的学生列表
/// </summary>
/// <returns></returns>
public List <ApiModels.Student> GetStudyStudents()
{
return(AllStudents.Where(m => StudentIds.Any(c => m.id == c)).ToList());
}