Question

我完全失去了......逻辑似乎设置正确但是while语句中的“响应”表示它在当前上下文中不存在。我在这里搜索，似乎在这种情况下似乎找到了相同的问题。问题是转向方法吗？

    do
        {
            Console.WriteLine("enter a number between 1 and 5");
            int x = Convert.ToInt32(Console.ReadLine());

            Random r = new Random();
            int rr = r.Next(1, 5);
            Console.WriteLine("Do you want to continue?  Please select yes or no.");
            string response = Convert.ToString(Console.ReadLine());
        } while (response == "yes");

Answer 1

在一个范围内声明的变量（通常是一组大括号{ ... }）在该范围之外无法访问。您已在循环中声明response 。您需要在循环之外声明response。

您还希望在使用String.Trim()进行比较之前修剪字符串中的空格。否则最后会有一个换行符（\n），导致你的比较失败。

string response; do { //... response = Console.ReadLine().Trim(); } while (response == "yes");

Answer 2

您的响应变量不在循环的上下文中。只需将变量声明移到循环外部，如下所示：

        string response = String.Empty;

        do
        {
            Console.WriteLine("enter a number between 1 and 5");
            int x = Convert.ToInt32(Console.ReadLine());

            Random r = new Random();
            int rr = r.Next(1, 5);
            Console.WriteLine("Do you want to continue?  Please select yes or no.");
            response = Convert.ToString(Console.ReadLine());
        } while (response == "yes");

Answer 3

可能有助于封装这一点。怎么样：

static void Main(string[] args)
    {
        Random rand = new Random();
        do
        {
            Write("enter a number between 1 and 5");
            string response = Console.ReadLine();
            int x = 5;
            if (Validate(response, "1-5")) int.TryParse(response, out x);                
            Write(rand.Next(0,x));
            Write("Do you want to continue?  Please select yes or no.");                
        } while (Validate(Console.ReadLine().ToLower(), "yes"));
    }
    static void Write(string s) => Console.WriteLine(s);
    static bool Validate(string s, string Pattern) => Regex.Match(s, Pattern).Success;

从do while语句接收用户输入

3 个答案: