Question

我有一个c＃项目，我创建了一个名为Employees的类。在这堂课里面，我有了新的名单：

如何显示由我创建的列表的整个数据库？

我怎么才能显示名字？

现在，如果我输入Football，则只会显示参与Football的员工姓名

以下是完整的课程：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

class Employee
{
    public string employeeID;
    public string Name;
    public string eventHeld;
    public int eventId;

    public Employee(string eID, string eName, string eEvents, int eId)
    {
        this.employeeID = eID;
        this.Name = eName;
        this.eventHeld = eEvents;
        this.eventId = eId;
    }

    public static void PrintDataBase() 
    {

    }

    static void Main()
    {
        List<Employee> employees = new List<Employee>();
        employees.Add(new Employee("PALI_e1","Parvez Ali","FOOTBALL",1));
        employees.Add(new Employee("AALI_e2", "Ashik Ali", "FOOTBALL", 1));
        employees.Add(new Employee("AALI_e3", "Aftab Ali", "CHESS", 2));
        employees.Add(new Employee("AALI_e4", "Arif Ali", "CRICKET", 3));

        Menu.MenuPrinting();
        Console.WriteLine("\nPlease Enter Your Choice");
        string Choice = Console.ReadLine();
        foreach(Employee e in employees)
        {
            Console.WriteLine(e);
        }
        Console.ReadLine();
    }
}

public class Menu
{
    public static void MenuPrinting()
    {
        Console.WriteLine("Main Menu");
        Console.WriteLine("=========");
        Console.WriteLine("1. DataBase");
        Console.WriteLine("2. Events Held");
        Console.WriteLine("3. Name of Emplyee");

    }
}

Answer 1

您可以使用Enumerable.Where方法根据字段过滤您的收藏：

string Choice = Console.ReadLine();
if(!string.IsNullOrEmpty(Choice))
{
   var filteredEmployees = employees.Where(e => e.eventHeld == Choice);
   foreach(Employee e in filteredEmployees)
   {
       Console.WriteLine(e);
   }
}

顺便说一句，您需要覆盖ToString课程的Employee方法，否则您只会在Console中看到您的班级名称。此示例应该让您了解如何操作您根据特定字段过滤集合，可以将此逻辑应用于其他属性。

Answer 2

foreach(Employee e in filteredEmployees)
{
    Console.WriteLine(e);
}

否则它将输出e的数据类型。我想你的意思是

Console.WriteLine(e.employeeID + " " + e.Name + " " + e.eventID + " " + e.eventHeld);

或某些类似于

的输出

列出C＃员工计划

2 个答案: