Question

我需要一些关于C＃编程的帮助。我正在编写一个关于Employee和事件的小型C＃编程。员工参与活动。我已经编写了员工参加单一活动的代码。

我需要帮助员工参与多个活动。例如员工Parvez参与多个活动Football，chess，cricket。

我需要一些帮助才能显示参与该特定活动的员工。

以下是代码：

using System;
using System.Collections.Generic;

class Program
{
    static void Main(string[] args)
    {
        List<Employee> empList = new List<Employee>();

        empList.Add(new Employee() { ID = 101, Name = "Parvez Ali", EventID = 1 });
        empList.Add(new Employee() { ID = 102, Name = "Ashik Ali", EventID = 1 });
        empList.Add(new Employee() { ID = 103, Name = "aftab Ali", EventID = 2 });
        empList.Add(new Employee() { ID = 104, Name = "Muhammad Ali", EventID = 3 });

        string Choice2 = null;
        do
        {
            Console.Clear();
            MenuDisplay.DisplayEvents();
            Console.WriteLine("\nPlease Enter your choice");
            int Choice = int.Parse(Console.ReadLine());
            Output(Choice, empList);

            Console.WriteLine("\nDo you want to Continue?(y/n)");
            Choice2 = Console.ReadLine();
        } while (Choice2 == "y");
        Console.WriteLine("GOODBYE");
        Console.ReadLine();
    }


    public static void Output(int Choices, List<Employee> employList)
    {
        switch (Choices)
        {
            case 1:
                Console.Clear();
                Console.WriteLine("List of PLayers Participated in Football");
                Console.WriteLine("========================================");
                Employee.DataBaseSearch(employList, Choices);
                break;
            case 2:
                Console.Clear();
                Console.WriteLine("List of PLayers Participated in Cricket");
                Console.WriteLine("=======================================");
                Employee.DataBaseSearch(employList, Choices);
                break;
            case 3:
                Console.Clear();
                Console.WriteLine("List of PLayers Participated in Chess");
                Console.WriteLine("=====================================");
                Employee.DataBaseSearch(employList, Choices);
                break;
            case 4:
                Console.Clear();
                Console.WriteLine("Entire DataBase");
                Console.WriteLine("===============");
                Employee.DataBaseDisplay(employList);
                break;
            default:
                Console.WriteLine("Invalid Input");
                break;
        }
    }
}

//public enum G 
//{
//    Football = 1,
//    Cicket = 2,
//    Chess = 3
//}

class MenuDisplay
{
    public static void DisplayEvents()
    {
        Console.WriteLine("Menu");
        Console.WriteLine("==========");
        Console.WriteLine("1.FootBall");
        Console.WriteLine("2.Cricket");
        Console.WriteLine("3.Chess");
        Console.WriteLine("4.Display DataBase");
    }
}

class Employee
{
    public int ID { get; set; }
    public string Name { get; set; }
    public int EventID { get; set; }

    public static void DataBaseSearch(List<Employee> employeeList, int Choices)
    {
        foreach (Employee employee in employeeList)
        {
            if (employee.EventID == Choices)
            {
                Console.WriteLine(employee.ID + " - " + employee.Name);
            }
        }
    }

    public static void DataBaseDisplay(List<Employee> employeeList)
    {
        foreach (Employee employee in employeeList)
        {
            Console.WriteLine(employee.ID + " - " + employee.Name);
        }
    }
}

谢谢

Answer 1

正如您所设计的那样，员工无法参加多个活动。这是因为您的Employee类使用此行存储与事件的关联：

public int EventID { get; set; }

这意味着员工只有一个事件。您想要的是让员工能够与一系列事件相关联。所以你需要这样的东西：

public IEnumerable<int> EventIDs { get; set; }

您需要对DataBaseSearch方法进行相应的更新

public static void DataBaseSearch(List<Employee> employeeList, int Choices)
{
    foreach (Employee employee in employeeList)
    {
        if (employee.EventIDs.Contains(Choices))
        {
            Console.WriteLine(employee.ID + " - " + employee.Name);
        }
    }
}

您还需要在程序开头更新添加员工的行，例如：

empList.Add(new Employee() { ID = 101, Name = "Parvez Ali", EventID = new List<int> { 1, 2 } });

C＃员工多事件

1 个答案: