public void AddStudentCourse(StudentCourseAdapter sc)
{
Student stud = GetStudent(sc.StudentId);
if (stud == null)
{
throw new Exception("Student with the same id not found...");
}
Course course = GetCourse(sc.CourseId);
if (course == null)
{
throw new Exception("Course with the same id not found...");
}
Func <StudentCourseAdapter, bool> predicat = item =>
{
bool b1 = item.StudentId == sc.StudentId && item.CourseId == sc.CourseId;
bool b2 = item.RegisterYear == sc.RegisterYear && item.RegisterSemester == sc.RegisterSemester;
return(b1 && b2);
};
if (studentCourseList.Any(predicat))
{
throw new Exception("can not Register the course in the same year and the same semester more than once...");
}
studentCourseList.Add(sc);
}
public void UpdateStudentCourse(StudentCourseAdapter sc)
{
Predicate <StudentCourseAdapter> predicat = item =>
{
bool b1 = item.StudentId == sc.StudentId && item.CourseId == sc.CourseId;
bool b2 = item.RegisterYear == sc.RegisterYear && item.RegisterSemester == sc.RegisterSemester;
return(b1 && b2);
};
XElement toUpdate = (from item in studentCourseRoot.Elements()
let temp = ConvertStudentCourse(item)
where predicat(temp)
select item).FirstOrDefault();
if (toUpdate == null)
{
throw new Exception("not found...");
}
foreach (PropertyInfo item in typeof(BE.StudentCourseAdapter).GetProperties())
{
toUpdate.Element(item.Name).SetValue(item.GetValue(sc));
}
studentCourseRoot.Save(studentCoursePath);
}
public void AddCourseToStudent(int studentId, int courseId, int year, Semester semester)
{
StudentCourseAdapter studentCourse = new StudentCourseAdapter
{
StudentId = studentId,
CourseId = courseId,
RegisterYear = year,
RegisterSemester = semester
};
dal.AddStudentCourse(studentCourse);
}
BE.StudentCourseAdapter ConvertStudentCourse(XElement element)
{
StudentCourseAdapter studentCourse = new StudentCourseAdapter();
foreach (PropertyInfo item in typeof(BE.StudentCourseAdapter).GetProperties())
{
TypeConverter typeConverter = TypeDescriptor.GetConverter(item.PropertyType);
object convertValue = typeConverter.ConvertFromString(element.Element(item.Name).Value);
item.SetValue(studentCourse, convertValue);
}
return(studentCourse);
}
public void UpdateStudentCourse(StudentCourseAdapter sc)
{
Predicate <StudentCourseAdapter> predicat = item =>
{
bool b1 = item.StudentId == sc.StudentId && item.CourseId == sc.CourseId;
bool b2 = item.RegisterYear == sc.RegisterYear && item.RegisterSemester == sc.RegisterSemester;
return(b1 && b2);
};
int index = studentCourseList.FindIndex(predicat);
if (index == -1)
{
throw new Exception("not found...");
}
studentCourseList[index] = sc;
}
public bool RemoveCourseFromStudent(int studentId, int courseId, int year, Semester semester)
{
Func <StudentCourseAdapter, bool> predicat = item =>
{
bool b1 = item.StudentId == studentId && item.CourseId == courseId;
bool b2 = item.RegisterYear == year && item.RegisterSemester == semester;
return(b1 && b2);
};
StudentCourseAdapter sc = studentCourseList.FirstOrDefault(predicat);
if (sc == null)
{
throw new Exception("not found...");
}
return(studentCourseList.Remove(sc));
}
public void UpdateStudentCourseGrade(int studentId, int courseId, int year, Semester semester, float?grade)
{
if (grade > 100)
{
throw new Exception("The maximum grade is '100'");
}
if (grade < 0)
{
throw new Exception("The minimum grade is '0' (or null)");
}
StudentCourseAdapter studentCourse = new StudentCourseAdapter
{
StudentId = studentId,
CourseId = courseId,
RegisterYear = year,
RegisterSemester = semester,
Grade = grade
};
dal.UpdateStudentCourse(studentCourse);
}
