使用平面菜单系统

您可以尝试对此进行更正和重构。

我们创建了一种获取用户选择的方法，因此不再需要重复代码。我们使用uint是因为choice是肯定的，而TryParse可以转换输入的字符串。如果发生错误，它将返回0，所以在这里很好。

我们也使用lamda打印选项字符串，以免重复。

接下来，我们使用开关来管理选择，以使代码更清晰，更可维护。

菜单之间的控制台已清除，我们提供了根菜单和子菜单之间的导航。

未来的改进是使用运行这些表的自动菜单管理器来创建菜单标题，选项和相关方法的表。只是稍微复杂一点而不会太多。可以通过创建一些集合和MenuManager类来完成。有了这样的东西，您将拥有一个健壮的系统，其中的代码很少，并且无需重复。

static void Test()
{
  MainMenu();
}

static uint GetUserChoice(Action printMenu,int choiceMax)
{
  uint choice = 0;
  Action getInput = () =>
  {
    uint.TryParse(Console.ReadLine(),out choice);
  };
  getInput();
  while ( choice < 1 || choice > choiceMax )
  {
    Console.WriteLine();
    Console.WriteLine("Please try again");
    printMenu();
    getInput();
  }
  return choice;
}

static void MainMenu()
{
  Action printMenu = () =>
  {
    Console.WriteLine("Press 1 if you are a customer");
    Console.WriteLine("Press 2 if you are a manager");
    Console.WriteLine("Press 3 to Exit");
  };
  Console.Clear();
  Console.WriteLine("-----------------------------------------------------------------------------------------------------------"); // introducing the user with the menu 
  Console.WriteLine("Welcome to VideoMart at University Boulevard!");
  Console.WriteLine("At VideoMart you are able to rent a variety of movies from many genres such as action,family,horror,etc!");
  Console.WriteLine();
  printMenu();
  Console.WriteLine("-----------------------------------------------------------------------------------------------------------");
  uint choice = GetUserChoice(printMenu,3);
  switch ( choice )
  {
    case 1:
      CustomerMenu();
      break;
    case 2:
      //ManagerMenu();
      break;
    case 3:
      Console.WriteLine("Thank you for visiting VideoMart at University Boulevard,Goodbye!");
      break;
    default:
      throw new NotImplementedException();
  }
}

static void CustomerMenu()
{
  Action printMenu = () =>
  {
    Console.WriteLine("Press 1 to view movies available to rent.");
    Console.WriteLine("Press 2 to rent a movie.");
    Console.WriteLine("Press 3 to view a list of movies you currently have rented.");
    Console.WriteLine("Press 4 to return a movie rented.");
    Console.WriteLine("Press 5 to return to main menu.");
  };
  Console.Clear();
  Console.WriteLine("-----------------------------------------------------------------------------------------------------------"); // introducing the user with the menu 
  Console.WriteLine("Below is a list of actions that can be performed by customers!");
  Console.WriteLine();
  printMenu();
  Console.WriteLine("-----------------------------------------------------------------------------------------------------------");
  Console.WriteLine();
  uint choice = GetUserChoice(printMenu,5);
  switch ( choice )
  {
    case 1:
      //MoviesAvailable();
      break;
    case 2:
      //RentMovie();
      break;
    case 3:
      //RentedMovies();
      break;
    case 4:
      //ReturnMovie();
      break;
    case 5:
      MainMenu();
      break;
    default:
      throw new NotImplementedException();
  }
}

使用自动菜单管理器

这是菜单选择类：

public class MenuChoice
{
  public string Title { get; private set; }
  public Action Action { get; private set; }
  public MenuChoice(string title,Action action)
  {
    Title = title;
    Action = action;
  }
}

这是菜单类：

public class Menu
{

  private readonly string Separator = new string('-',100);
  private string Header;
  private List<MenuChoice> Choices;
  private Menu Root;

  public Menu(string header,List<MenuChoice> choices,Menu root)
  {
    Header = header;
    Choices = choices;
    Root = root;
  }

  private void Print()
  {
    for ( int index = 0; index < Choices.Count; index++ )
      Console.WriteLine($"Press {index + 1} {Choices[index].Title}");
      Console.WriteLine($"Press {Choices.Count + 1} to " + 
                        $"{( Root == null ? "exit" : "go to previous menu" )}");
  }

  public void Run()
  {
    Console.Clear();
    Console.WriteLine(Separator);
    Console.WriteLine(Header);
    Console.WriteLine();
    Print();
    Console.WriteLine(Separator);
    uint choice = GetUserChoice();
    if ( choice == Choices.Count + 1 )
      if ( Root == null )
      {
        Console.WriteLine("Thank you for visiting VideoMart at University Boulevard,Goodbye!");
        return;
      }
      else
        Root.Run();
    else
    {
      var action = Choices[(int)choice - 1].Action;
      if ( action != null )
        action();
      else
      {
        Console.WriteLine("Not implemented yet,press a key to continue.");
        Console.ReadKey();
        Run();
      }
    }
  }

  uint GetUserChoice()
  {
    uint choice = 0;
    Action getInput = () =>
    {
      uint.TryParse(Console.ReadLine(),out choice);
    };
    getInput();
    while ( choice < 1 || choice > Choices.Count + 1 )
    {
      Console.WriteLine();
      Console.WriteLine("Please try again");
      Print();
      getInput();
    }
    return choice;
  }

}

这是菜单管理器类：

public class MenuManager
{
  private Menu Root;

  public MenuManager(Menu root)
  {
    Root = root;
  }

  public void Run()
  {
    Root.Run();
  }
}

在此使用方法或其他菜单初始化菜单管理器，而不是在选择中使用null：

var choicesMain = new List<MenuChoice>();
var choicesCustomer = new List<MenuChoice>();
var choicesManager = new List<MenuChoice>();

string headerMain = "Welcome to VideoMart at University Boulevard!" + Environment.NewLine +
                    "At VideoMart you are able to rent a variety of movies from many genres such as action,etc!";
string headerCustomer = "Below is a list of actions that can be performed by customers!";
string headerManager = "Below is a list of actions that can be performed by managers!";

var root = new Menu(headerMain,choicesMain,null);
var menuCustomer = new Menu(headerCustomer,choicesCustomer,root);
var menuManager = new Menu(headerManager,choicesManager,root);

choicesMain.Add(new MenuChoice("if you are a customer",menuCustomer.Run));
choicesMain.Add(new MenuChoice("if you are a manager",menuManager.Run));

choicesCustomer.Add(new MenuChoice("to view movies available to rent.",null));
choicesCustomer.Add(new MenuChoice("to rent a movie.",null));
choicesCustomer.Add(new MenuChoice("to view a list of movies you currently have rented.",null));
choicesCustomer.Add(new MenuChoice("to return a movie rented.",null));

现在要做的是：

new MenuManager(root).Run();