Question

代码做了我想要的，但我想进一步。目前，如果用户输入错误的名称，它将输出＆＃34;作者未找到＆＃34;然后结束。

如何让它重新输入代码？

static void Main(string[] args)
    {
        string[] author = {"William Shakespear", "Mark Twain", "Jane Austin", "Charlotte Bronte", "Louisa May Alcott",
            "Lewis Carroll", "D.H. Lawrence", "Charles Dickens", "Lucy Maud Montgomery", "Alexander Dumas" };
        Console.WriteLine("Please type in an Author: ");
        string name = Console.ReadLine();
        int location = linearUnsorted(author, name);
            if (location == -1)
        {
            Console.WriteLine("Author not found, please try another");

        }
        else
        {
            Console.WriteLine("{0} is located at {1} in the poll", name, location + 1);
        }
        Console.ReadLine();
    }
    public static int linearUnsorted(string[] arr, string item)
    {
        int location = 0;
        while (location <arr.Length && !String.Equals(item, arr[location], StringComparison.OrdinalIgnoreCase))
        {
            location++;
        }
        if (location == arr.Length)
        {
            location = -1;
        }
        return location;
    }
}
}

Answer 1

你应该把你的逻辑放在循环中并继续直到输入无效：

static void Main(string[] args)
{
    string[] author = {"William Shakespear", "Mark Twain", "Jane Austin", "Charlotte Bronte", "Louisa May Alcott",
    "Lewis Carroll", "D.H. Lawrence", "Charles Dickens", "Lucy Maud Montgomery", "Alexander Dumas" };

    while (true)
    {
        Console.WriteLine("Please type in an Author: ");
        string name = Console.ReadLine();
        int location = linearUnsorted(author, name);
        if (location == -1)
        {
            Console.WriteLine("Author not found, please try another");

        }
        else
        {
            Console.WriteLine("{0} is located at {1} in the poll", name, location + 1);
            break;
        }
    }
    Console.ReadLine();
}

Answer 2

你可以用while循环来完成。

Console.WriteLine("Please type in an Author: ");
int location;

while(location = linearUnsorted(author, Console.Readline()) == -1)
{
    Console.WriteLine("Author not found, please try another: ");
}

Console.WriteLine("{0} is located at {1} in the poll", name, location + 1);

P.S你应该使用int index = Array.IndexOf(author, name);来获取数组中的项目索引，如果你想要不区分大小写的检查，可以使用Array.FindIndex(author, t => t.Equals(name, StringComparison.InvariantCultureIgnoreCase))。

如何在无效输入后让代码重新进入循环

2 个答案: