/// <summary>
/// 将学生加入讨论课小组.
/// </summary>
/// <param name="userId">学生的id</param>
/// <param name="groupId">要加入讨论课小组的id</param>
/// <returns>long 该条记录的id</returns>
/// <exception cref="T:System.ArgumentException">id格式错误</exception>
/// <exception cref="T:Xmu.Crms.Shared.Exceptions.GroupNotFoundException">未找到小组</exception>
/// <exception cref="T:Xmu.Crms.Shared.Exceptions.UserNotFoundException">不存在该学生</exception>
/// <exception cref="T:System.InvalidOperationException">待添加学生已经在小组里了</exception>
public long InsertSeminarGroupMemberById(long userId, long groupId)
{
UserInfo _user;
SeminarGroup _sg;
//id <= 0
if (userId <= 0 || groupId <= 0)
{
throw new ArgumentException("id格式错误");
}
//未找到小组
if ((_sg = _db.SeminarGroup.Find(groupId)) == null)
{
throw new GroupNotFoundException();
}
//不存在该学生
if ((_user = _db.UserInfo.Find(userId)) == null)
{
throw new UserNotFoundException();
}
//待添加学生已经在小组里
if (_db.SeminarGroupMember
.Include(sgt => sgt.SeminarGroup)
.Include(sgt => sgt.Student)
.Where(_sgm => _sgm.SeminarGroup.Id == groupId && _sgm.Student.Id == userId)
.ToList().Count != 0)
{
throw new System.InvalidOperationException("待添加学生已经在小组里了");
}
//新建SeminarGroupMember对象
SeminarGroupMember sgm = new SeminarGroupMember();
sgm.SeminarGroup = _sg;
sgm.Student = _user;
_db.SeminarGroupMember.Add(sgm);
_db.SaveChanges();
return(sgm.Id);
}
/// <summary>
/// 创建小组成员信息.
/// 将小组成员加入某一小组
/// </summary>
/// <param name="groupId">小组的id</param>
/// <param name="seminarGroupMember">小组成员信息</param>
/// <returns>long 返回该小组成员表的id</returns>
public long InsertSeminarGroupMemberByGroupId(long groupId, SeminarGroupMember seminarGroupMember)
{
if (groupId <= 0)
{
throw new ArgumentException("groupId格式错误");
}
SeminarGroup sg = _db.SeminarGroup.Find(groupId);
if (sg == null)
{
throw new GroupNotFoundException();
}
seminarGroupMember.SeminarGroup = sg;
_db.SeminarGroupMember.Add(seminarGroupMember);
_db.SaveChanges();
return(seminarGroupMember.Id);
}
