c# - 回到代码块的开头？

Question

在用户输入错误的 key 后，我需要返回到此处显示的代码的开头。是否有任何简单的代码行会返回到另一行？如您所见，我已经设置了一个 if 语句，所以我可以添加一些可以返回到代码开头或另一个区域的内容。一般来说，我对 C# 和编程真的很陌生。我真的只是不想将所有代码再次输入到另一个会产生相同问题的 if 语句中。我希望让代码在用户输入错误的 key 后再次运行，因为这样他们就可以重新阅读代码，而不必再次从头开始。

//Runs battle interactive
Console.WriteLine("");
Console.WriteLine("You have encountered a simple guard!  He deals 2 damage per attack and has 1 HP.");
Console.WriteLine("You currently have: " + Program.Inventory);
Console.WriteLine("Choose a weapon!");
var input2 = Console.ReadKey();


//Key checker for items
switch (input2.Key)
{
    case ConsoleKey.D1:
        Console.WriteLine("");
        if (Items.iniFists == true)
        {
            Console.WriteLine("You have attacked with your Fists for 1 DMG!");
        }
        else
        {
            //this will never run, just a placeholder
            Console.WriteLine("You Don't have your fists!");
            switch (input2.Key)
            {
                case ConsoleKey.D1:
                    Console.WriteLine("");
                    if (Items.iniFists == true)
                    {
                        Console.WriteLine("You have attacked with your Fists for 1 DMG!");
                    }
                    else
                    {
                        //this will never run, just a placeholder
                        Console.WriteLine("You Don't have your fists!");
                    }
                    break;
                case ConsoleKey.D2:
                    Console.WriteLine("");
                    if (Items.iniLongsword == true)
                    {
                        Console.WriteLine("You have chosen to attack with the Longsword for 2 DMG!");
                    }
                    else
                    {
                        Console.WriteLine("You don't have a longsword!");
                    }
                    break;
                case ConsoleKey.D3:
                    Console.WriteLine("");
                    if (Items.iniBow == true)
                    {
                        Console.WriteLine("You have chosen to attack with the Bow for 3 DMG!");
                    }
                    else
                    {
                        Console.WriteLine("You don't have a Bow!");
                    }
                    break;
                case ConsoleKey.D4:
                    Console.WriteLine("");
                    if (Items.iniLightstaff == true)
                    {
                        Console.WriteLine("You have chosen to attack with the Lightstaff for 4 DMG!");
                    }
                    else
                    {
                        Console.WriteLine("You don't have a Lightstaff!");
                    }
                    break;
                case ConsoleKey.D5:
                    Console.WriteLine("");
                    Console.WriteLine("You can't attack with an Apple!");
                    break;
                case ConsoleKey.D6:
                    Console.WriteLine("");
                    Console.WriteLine("You can't attack with a Golden Key!");
                    break;
                case ConsoleKey.D7:
                    Console.WriteLine("");
                    Console.WriteLine("You can't attack with a Steak!");
                    break;
            }
        }
        break;
    case ConsoleKey.D2:
        Console.WriteLine("");
        if (Items.iniLongsword == true)
        {
            Console.WriteLine("You have chosen to attack with the Longsword for 2 DMG!");
        }
        else
        {
            Console.WriteLine("You don't have a longsword!");
        }
        break;
    case ConsoleKey.D3:
        Console.WriteLine("");
        if (Items.iniBow == true)
        {
            Console.WriteLine("You have chosen to attack with the Bow for 3 DMG!");
        }
        else
        {
            Console.WriteLine("You don't have a Bow!");
        }
        break;
    case ConsoleKey.D4:
        Console.WriteLine("");
        if (Items.iniLightstaff == true)
        {
            Console.WriteLine("You have chosen to attack with the Lightstaff for 4 DMG!");
        }
        else
        {
            Console.WriteLine("You don't have a Lightstaff!");
        }
        break;
    case ConsoleKey.D5:
        Console.WriteLine("");
        Console.WriteLine("You can't attack with an Apple!");
        break;
    case ConsoleKey.D6:
        Console.WriteLine("");
        Console.WriteLine("You can't attack with a Golden Key!");
        break;
    case ConsoleKey.D7:
        Console.WriteLine("");
        Console.WriteLine("You can't attack with a Steak!");
        break;
}

Answer 1

C# 支持代码中的标签，但不推荐使用，因为它违反了许多编码最佳实践，但我想任何规则总会有异常(exception)。

class Program
{
    static void Main(string[] args)
    {
    Start:
        Console.WriteLine("Start Here... Press any key");
        var key = Console.ReadKey(true);

        switch (key.Key)
        {
            case ConsoleKey.A:
                goto MyLabel;

            case ConsoleKey.B:
                goto MyLabel2;

            case ConsoleKey.C:
                goto MyLabel3;

            default:
                Console.WriteLine("Bad Choice");
                goto Start;

        }

    MyLabel:
        Console.WriteLine("MyLabel: A");
        goto Start;

    MyLabel2:
        Console.WriteLine("MyLabel: B");
        goto Start;


    MyLabel3:
        Console.WriteLine("MyLabel: C");
        goto Start;
    }
}

您可以在此处找到更多信息:

http://msdn.microsoft.com/en-us/library/d96yfwee.aspx http://msdn.microsoft.com/en-us/library/13940fs2.aspx