public List <Group> getGroups()
{
GroupDBContext groupdb = new GroupDBContext();
List <Group> groups = groupdb.groups.ToList();
groupdb = null;
return(groups);
}
//查找某课程的group
public List <Group> getGroups(string courseId)
{
GroupDBContext gdb = new GroupDBContext();
List <Group> gList = gdb.groups.ToList();
List <Group> result = new List <Group>();
foreach (Group g in gList)
{
if (g.courseId == courseId)
{
result.Add(g);
}
}
return(result);
}