I am new to c # and I have gaps in programming in it.

I need your help in implementing the program logic.

I am trying to store a value in a list that will be added after the entered command in the console.

The value is added, but when I repeat the command, the new value is not written to the list, it disappears.

public interface IDataSource{
    MainRecord Save(MainRecord record);
    MainRecord Get(int id);
    bool Delete(int id);
    List<MainRecord> GetAll();
}
abstract public class MainRecord{
    public int id;
    public  string address;
    public  string activity;
    public  string data_1;
    public  string data_2;
}
public class MemoryDataSource : IDataSource{
    private List<MainRecord> record = new List<MainRecord>();
    public MainRecord Save(MainRecord records){
        records.id = record.Count;
        record.Add(records);
        return records;
    }
    public MainRecord Get(int id){
        return record[id];
        
    }
    public bool Delete(int id){
        if(record[id] != null){
            record.RemoveAt(id);
            return true;
        }else{
            return false;
        }

    }
    public List<MainRecord> GetAll(){
        return record;
    }
}
public class BussinessLogic {
    private IDataSource dataSource;
    public BussinessLogic(IDataSource source){
        dataSource = source;
    }
    public List<MainRecord> GetList(){
        List<MainRecord> list = dataSource.GetAll();
        return list;
    }
    public List<MainRecord> SaveList(MainRecord record){
        List<MainRecord> list = dataSource.GetAll();
        list.Add(dataSource.Save(record));
        return list;
    }
}
class Program: MainRecord {
    static BussinessLogic logic;
    static void PrintMenu(){
        Console.WriteLine("1 - save, 2 - output by id , 3 - output all List, delete - delete by id , exit - exit programm");
    }
    static void SaveListId(){
        Console.WriteLine("Addres: ");
        string Newaddress = Console.ReadLine();
        Console.WriteLine("List of planned events: ");
        string Newactivity = Console.ReadLine();
        Console.WriteLine("Date 1: ");
        string Newdata_1 = Console.ReadLine();
        Console.WriteLine("Date 2: ");
        string Newdata_2 = Console.ReadLine();
        List<MainRecord> list = logic.SaveList(new Program{address = Newaddress, activity = Newactivity, data_1 = Newdata_1, data_2 = Newdata_2});
        Main();
    }
    static void PrintListId(){

        Main();
    }
    static void Delete(){

        Main();
    }
    static void PrintList(){
        List<MainRecord> list = logic.GetList();
        foreach(MainRecord record in list){
            Console.WriteLine(record.id);
        }
        Main();
    }
    static void Main(){
        logic = new BussinessLogic(new MemoryDataSource());
        bool exit = false;

        while(!exit){
            PrintMenu();
            string command = Console.ReadLine();
            switch(command){
                case "1":
                    SaveListId();
                break;
                case "2":
                    PrintListId();
                break;
                case "3":
                    PrintList();
                break;
                case "delete":
                    Delete();
                break;
                case "exit":
                return;
            }
        }
    }
}

i guess it is because of this line

private List<MainRecord> record = new List<MainRecord>();

if so, how can the code be implemented to make the recording work correctly?

CodePudding user response：

Your problem is because when you call SaveListId it calls back to Main() at the end of the method. This in turn creates a new object, logic = new BussinessLogic(new MemoryDataSource());. I would start by removing the Main() call, since just returning to the caller would be more appropriate, since I assume recursion was not intended.