过去两周我一直在做作业，我很难克服这个问题。
以下是代码。这绝不是完成的代码，无论如何，一旦我将所有部件都工作，我将整理它。在主要案例1中：在询问了一系列问题后，我想将S1传递给R1.addStudent方法，这是有效的，但是，如果你查看注册类，addStudent方法会添加S1对象/数据成员和标记为列表。
我的问题是，一旦我尝试遍历此列表（请参阅模块类），它会迭代元素的数量但返回最后一个条目名称两次（使用toString（）方法），它返回student.Name（数据成员）继承自Person类）。
我希望它迭代添加到列表中的实际名称名称，我将如何完成此操作？
请原谅冗长的解释，对于不整洁的代码没有火焰，我会解决这个问题。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace P3_O_O_P
{
public class Module
{
private string moduleName;
private double moduleCode;
public List<Registration> registerList = new List<Registration>();
public Module(string newModuleName, double newModuleCode)
{
moduleName = newModuleName;
moduleCode = newModuleCode;
}
public Module()
{
}
public void Enrol(Student student, int mark, Classroom objClassroom)
{
Console.Clear();
Console.Write("\nBelow are a list of modules that are currently available: \n");
Console.Write("\n1) Software Development\n");
Console.Write("\n2) Chemistry\n");
Console.Write("\n3) Science\n");
Console.Write("\n4) Biology\n");
Console.Write("\nSelection: ");
int choice = Convert.ToInt32(Console.ReadLine());
switch (choice)
{
case 1:
objClassroom.addStudentProgramming(student, mark);
break;
case 2:
objClassroom.addStudentChemistry(student, mark);
break;
case 3:
objClassroom.addStudentScience(student, mark);
break;
case 4:
objClassroom.addStudentBiology(student, mark);
break;
}
}
public void studentListMarks()
{
for (int i = 0; i < registerList.Count; i++)
{
Console.WriteLine("\nStudent name: " + registerList[i].ToString() + "\nCurent student marks" + registerList[i].Mark);
}
}
public string ModuleName
{
get
{
return moduleName;
}
set
{
moduleName = value;
}
}
public double ModuleID
{
get
{
return moduleCode;
}
set
{
moduleCode = value;
}
}
public void RemoveStudent()
{
throw new System.NotImplementedException();
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace P3_O_O_P
{
public class Registration
{
Student student; //Links student to registration, forcing data-integrity and granting a link to its data-members.
private int mark;
public Registration(Student ST, int mark) //passes the student object to the constructor.
{
this.mark = mark;
student = ST; //Initializes the student object. allocates memory.
}
public int Mark
{
get
{
return mark;
}
set
{
mark = value;
}
}
public int updateMark()
{
Console.Write("Please enter a new mark: ");
mark = Convert.ToInt16(Console.ReadLine());
return mark;
}
public void viewStudentMark()
{
Console.Write("\nStudent mark = : " + Mark);
}
public void addStudent(Student S1, Module objMod, Classroom objClassroom, int mark)
{
objMod.registerList.Add(new Registration(S1, mark));
objMod.Enrol(S1, Mark, objClassroom);
}
public string studentSubject()
{
return student.Subject;
}
public string ToString(Student S1)
{
return student.Name;
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace P3_O_O_P
{
class Execute
{
static void Main(string[] args)
{
bool repeatMenu = true;
int choice = 0;
int mark = 0;
Student S1 = new Student();
Registration R1 = new Registration(S1, mark);
Module M1 = new Module();
Classroom C1 = new Classroom();
do
{
Console.ForegroundColor = ConsoleColor.Red;
Console.BackgroundColor = ConsoleColor.White;
Console.WriteLine("\n1) Enrol a student");
Console.WriteLine("\n2) View students in Programming");
Console.WriteLine("\n3) View students in Chemistry");
Console.WriteLine("\n4) View students in Science");
Console.WriteLine("\n5) View students in Biology");
Console.WriteLine("\n6) View Classrooms (Modules)");
Console.WriteLine("\n7) View all Students");
Console.WriteLine("\n8) Update student mark ");
Console.WriteLine("\n9) View student mark");
Console.WriteLine("\n10) Exit Application");
Console.Write("\nSelection: ");
choice = Convert.ToInt32(Console.ReadLine());
repeatMenu = false;
Console.Clear();
switch (choice)
{
case 1:
Console.Write("\nPlease begin by entering your name: ");
S1.Name = Console.ReadLine();
Console.Write("\nPlease enter your Date of Birth: ");
S1.StudentDOB = Convert.ToDouble(Console.ReadLine());
Console.Write("\nPlease enter your preferred subject: ");
S1.Subject = Console.ReadLine();
Console.Write("\nPlease hand the console to the administrator, thank you.\n");
Console.Write("\nPlease enter/allocate an I.D.: ");
S1.ID = Convert.ToDouble(Console.ReadLine());
Console.Write("\nPlease enter a mark: ");
mark = Convert.ToInt32(Console.ReadLine());
R1.addStudent(S1, M1, C1, mark);
repeatMenu = true;
break;
case 2:
C1.ViewStudentsProgramming();
repeatMenu = true;
break;
case 3:
C1.viewStudentsChemistry();
repeatMenu = true;
break;
case 4:
C1.viewStudentsScience();
repeatMenu = true;
break;
case 5:
C1.viewStudentsBiology();
repeatMenu = true;
break;
case 6:
Console.Write("\nAvailable classrooms: \n");
Console.Write("\nSoftware Development\n");
Console.Write("\nChemistry\n");
Console.Write("\nScience\n");
Console.Write("\nBiology\n");
Console.Write("\nPress any key to continue!");
Console.ReadKey();
Console.Clear();
repeatMenu = true;
break;
case 7:
M1.studentListMarks();
repeatMenu = true;
break;
case 8:
R1.updateMark();
repeatMenu = true;
break;
case 9:
R1.viewStudentMark();
repeatMenu = true;
break;
default:
Console.WriteLine("\nThank you for using this application, goodbye!\n");
break;
}
} while (repeatMenu == true);
}
}
}
答案 0 :(得分：1)
如评论中所述，您的问题很可能与列表中的相同条目有两次相关。但是我想鼓励你遍历列表本身，而不是像对待数组那样对待它。
而不是：
for (int i = 0; i < registerList.Count; i++)
{
Console.WriteLine("\nStudent name: " + registerList[i].ToString() + "\nCurent student marks" + registerList[i].Mark);
}
这样做：
foreach(var student in registerList)
{
Console.WriteLine("\nStudent name: " + student.ToString() + "\nCurent student marks" + student.Mark);
}
答案 1 :(得分：1)
据我所知，只有一个学生实例，因此每个注册实例都指向同一个学生。