利用C# Map集合解决实际应用问题的案例

在这个案例中，我们将使用C#的Dictionary集合（它是一个键值对集合，类似于其他编程语言中的Map）来存储员工的ID和他们的薪水。我们将创建一个简单的控制台应用程序，用于添加员工、显示员工薪水以及更新员工薪水。

首先，我们需要创建一个Employee类来存储员工的信息：

public class Employee
{
    public int Id { get; set; }
    public string Name { get; set; }
    public decimal Salary { get; set; }
}

接下来，我们将创建一个EmployeeManager类来处理员工的添加、显示和更新操作：

using System;
using System.Collections.Generic;

public class EmployeeManager
{
    private Dictionary _employees = new Dictionary();

    public void AddEmployee(Employee employee)
    {
        if (!_employees.ContainsKey(employee.Id))
        {
            _employees.Add(employee.Id, employee);
        }
        else
        {
            Console.WriteLine("Employee with this ID already exists.");
        }
    }

    public void DisplayEmployeeSalary(int employeeId)
    {
        if (_employees.ContainsKey(employeeId))
        {
            Employee employee = _employees[employeeId];
            Console.WriteLine($"Employee {employee.Name} has a salary of {employee.Salary}.");
        }
        else
        {
            Console.WriteLine("Employee not found.");
        }
    }

    public void UpdateEmployeeSalary(int employeeId, decimal newSalary)
    {
        if (_employees.ContainsKey(employeeId))
        {
            Employee employee = _employees[employeeId];
            employee.Salary = newSalary;
            Console.WriteLine($"Employee {employee.Name}'s salary has been updated to {employee.Salary}.");
        }
        else
        {
            Console.WriteLine("Employee not found.");
        }
    }
}

最后，我们将在Main方法中使用EmployeeManager类来处理用户输入：

using System;

class Program
{
    static void Main(string[] args)
    {
        EmployeeManager manager = new EmployeeManager();

        while (true)
        {
            Console.WriteLine("1. Add Employee");
            Console.WriteLine("2. Display Employee Salary");
            Console.WriteLine("3. Update Employee Salary");
            Console.WriteLine("4. Exit");
            Console.Write("Enter your choice: ");
            int choice = Convert.ToInt32(Console.ReadLine());

            switch (choice)
            {
                case 1:
                    Console.Write("Enter employee ID: ");
                    int id = Convert.ToInt32(Console.ReadLine());
                    Console.Write("Enter employee name: ");
                    string name = Console.ReadLine();
                    Console.Write("Enter employee salary: ");
                    decimal salary = Convert.ToDecimal(Console.ReadLine());

                    Employee employee = new Employee { Id = id, Name = name, Salary = salary };
                    manager.AddEmployee(employee);
                    break;

                case 2:
                    Console.Write("Enter employee ID: ");
                    int displayId = Convert.ToInt32(Console.ReadLine());
                    manager.DisplayEmployeeSalary(displayId);
                    break;

                case 3:
                    Console.Write("Enter employee ID: ");
                    int updateId = Convert.ToInt32(Console.ReadLine());
                    Console.Write("Enter new salary: ");
                    decimal newSalary = Convert.ToDecimal(Console.ReadLine());
                    manager.UpdateEmployeeSalary(updateId, newSalary);
                    break;

                case 4:
                    Environment.Exit(0);
                    break;

                default:
                    Console.WriteLine("Invalid choice. Please try again.");
                    break;
            }
        }
    }
}

现在，当你运行这个程序时，你可以添加员工、显示员工薪水以及更新员工薪水。这个简单的例子展示了如何使用C#的Dictionary集合（类似于其他编程语言中的Map）来解决实际应用问题。