大学作业。需要创建将存储类 B 的类 A，类 B 将存储类 C。“存储”可能只是 ARRAY，没有别的。对于前。 A 类是一个“Section”，它将存储类“Group”(Group[])，它将存储类“GroupMember”(GroupMember[])。 在这些类之间传递数据的唯一允许方式是使用索引器和属性。此外，所有这些都必须以菜单形式打包，以便用户可以添加、读取每个类的数据。 这是我的看法。我经常遇到越界索引器或 null inst 的错误。错误。 下面是 NestedClasses .cs 文件
public class Section
{
public string Name { get; set; }
Group[] own;
public int Length;
public Section(int Len, Group[] PIDARAS)
{
Length = Len;
own = PIDARAS = new Group[Len];
}
public Group this[int index]
{
get
{
return own[index];
}
set
{
own[index] = value;
}
}
}
public class Group
{
public string Name { get; set; }
GroupMember[] personalInfo = new GroupMember[5];
public Group(params GroupMember[] personalInfo)
{
personalInfo.Initialize();
}
public GroupMember this[int index]
{
get => personalInfo[index];
set => personalInfo[index] = value;
}
}
public class GroupMember
{
public string FirstName { get; set; }
public string LastName { get; set; }
public GroupMember(string firstname, string lastName)
{
FirstName = firstname;
LastName = lastName;
}
}
} ```
And here is the menu part
``` public class Program
{
private static bool hasRun = false;
private static int Gr = 0;
private static int Ptc = 0;
private static Section sectionDB = new Section(5, new Group[]{});
static void Main()
{
sectionDB.Name = "IHateIndexers";
if (hasRun == false)
{
Console.WriteLine("Hello b0ss, how many section do u want to have?");
}
if (hasRun == false)
{
//const int sectionsAmount = 5;
}
Console.Clear();
ConsoleKey KeyPress;
while (true)
{
Console.WriteLine("Choose action:" +
"\n-1 Add ... " +
"\n-2 Show Gr Members. " +
"\n-3 Show Groups" +
"\n-4 Show Section" +
"\n-5 Search..." +
"\n-<ESC> Escape.");
KeyPress = Console.ReadKey(true).Key;
switch (KeyPress)
{
case (ConsoleKey.D1):
Console.Clear();
CustomAdd();
break;
case (ConsoleKey.D2):
Console.Clear();
ShowParticipants();
break;
case (ConsoleKey.D3):
Console.Clear();
ShowGroups();
break;
case (ConsoleKey.D4):
Console.Clear();
ShowSection();
break;
case (ConsoleKey.D5):
Console.Clear();
//CustomSearch();
break;
case (ConsoleKey.Escape):
Console.Clear();
Environment.Exit(0);
break;
default:
Console.Clear();
Console.WriteLine("No Such operation.");
break;
}
}
}
static void CustomAdd()
{
ConsoleKey KeyPress;
while (true)
{
Console.WriteLine("Choose action:" +
"\n-1 Add Group member " +
"\n-2 Add Group " +
"\n-3 Add Section" +
"\n-<ESC> Back.");
KeyPress = Console.ReadKey(true).Key;
switch (KeyPress)
{
case (ConsoleKey.D1):
Console.Clear();
AddParticipant();
break;
case (ConsoleKey.D2):
Console.Clear();
AddGroup();
break;
case (ConsoleKey.D3):
AddSection();
break;
case (ConsoleKey.D4):
Console.Clear();
break;
case (ConsoleKey.Escape):
Console.Clear();
Main();
break;
default:
Console.Clear();
Console.WriteLine("no such operation.");
break;
}
}
}
static void AddParticipant()
{
Console.Clear();
// sectionDB[Gr][Ptc].Name = Console.ReadLine();
Ptc++;
Console.WriteLine("Group Added Succesfully");
}
static void AddSection()
{
Console.Clear();
sectionDB.Name = Console.ReadLine();
Console.WriteLine("Section Added Succesfully");
}
static void AddGroup()
{
Console.Clear();
Console.WriteLine(sectionDB.Name);
sectionDB[Gr].Name = Console.ReadLine();
Gr++;
Console.WriteLine("Group Added Succesfully");
}
static void ShowSection()
{
Console.WriteLine(sectionDB.Name);
}
static void ShowGroups()
{
Console.WriteLine(Gr);
for (int i = 0; i < Gr; i++)
{
Console.WriteLine(sectionDB[i].Name);
}
}
static void ShowParticipants()
{
Console.WriteLine(Gr);
for (int i = 0; i < Gr; i++)
{
for (int j = 0; j < Ptc; j++)
{
// Console.WriteLine(sectionDB[i][j].Name);
}
}
}
}
} ```