C#CMD输入验证

Question

我正在努力让它在输入数字时不会崩溃，到目前为止就是这样。然后我希望它重新请求输入，直到插入正确的字符类型。

int firstNum;
int Operation = 0;
   switch(Operation)
   {
        case 1:
            bool firstNumBool = int.TryParse(Console.ReadLine(), out firstNum);
         break;
   }

Answer 1

分解您的解决方案提取用于输入整数的方法：

 private static int ReadInteger(string title) {
   // Keep on asking until correct input is provided
   while (true) {
     if (!string.IsNullOrWhiteSpace(title))
       Console.WriteLine(title);
     if (int.TryParse(Console.ReadLine(), out int result))
       return result;
     Console.WriteLine("Sorry, not a valid integer value; please, try again.");
   }
 }

然后使用它：

 int firstNum;
 ...
 switch(Operation)
 {
      case 1:
          firstNum = ReadInteger("First number");
          break;
      ...