public delegate bool GradePrint(Student s);

public class top3
{
    public GradePrint GP { set; get; }
}

public class GradeReport
{
    public static bool GradeReportOrderByTerm(Student s)
    {
        // 实现成绩单按学期排序的逻辑
        return true;
    }
}

public class top
{
    public static void Main()
    {
        Student student = new Student();
        student.GP = GradeReport.GradeReportOrderByTerm;

        // 调用委托打印成绩数据
        bool result = student.GP(student);

        if (result)
        {
            Console.WriteLine("成绩单打印成功！");
        }
        else
        {
            Console.WriteLine("成绩单打印失败！");
        }
    }
}