//初始化
private void TestActivityInit(string activityName, string activityId)
{
DataTable dt = dbUtill.GetGradeinfo();
IniiTableMenu(dt);
GradeId = dbUtill.GetGradeNO1();
DataTable dt2 = dbUtill.GetClassInfo(GradeId);
ClassId = dbUtill.GetClassNO1(GradeId);
IniiTableClass(dt2);
ActivityTitle.Text = activityName + " 学生体测数据";
List <Student> students = dbUtill.GetStudentListByClassIdAndActivityId(ClassId, activityId);
StdDataGrid.ItemsSource = students;
}