我不明白爲什麼我收到以下錯誤

Question

我非常確定我擁有所有權利。我在想，不知怎的，我的語法是錯誤的，但我沒有運氣試圖向谷歌，爲什麼它是錯的。這裏是我的代碼：是

namespace Exercise1 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 
      Values aValue = new Values(); 

      //set array 
      int[] number = new int[12]; 

      //ask user for input 
      Console.WriteLine("Please enter a value between 0 and 10: "); 
      aValue.InValue = Console.ReadLine(); //Read input 
      aValue.IntValue = int.Parse(aValue.InValue); //convert string to int 

      while (aValue.IntValue != -99) //user has not stopped program 

       if (aValue.IntValue > 10 || aValue.IntValue < 0) //valid value 
        Console.WriteLine("Thank you! Please enter '-99' when you are ready to finsih."); 
      aValue.InValue = Console.ReadLine(); //read input 
      aValue.IntValue = int.Parse(aValue.InValue); //convert string to int 
      number[aValue.IntValue]++; //add input to corresponding array box 

????  else 
       Console.WriteLine("You have entered an invalid value."); 
      aValue.InvalidValueCount()++; 

      namespace Exercise1 
      { 
       class Values 
       { 
        private string inValue; 
        public string InValue { get; set; } 

        private int intValue; 
        public int IntValue { get; set; } 

        private int validValueCount; 
        public int ValidValueCount { get; set; } 

        private int invalidValueCount; 
        public int InvalidValueCount() { 
         invalidValueCount = 0; 
         return invalidValueCount; 
        } 
       } 
      } 

錯誤消息如下：

無效表達術語 '其他'
;預期（在「else」之後）
只能使用賦值，調用，增量，減量，等待和新對象表達式作爲語句（在「number[aValue.IntValue]++;」之後）
增量或減量運算符的操作數必須是變量，財產或索引（在「aValue.InvalidValueCount()++;」之後）

感謝您的幫助！

Answer 1

你需要周圍的代碼塊多花括號後而/ if/else語句

 while (aValue.IntValue != -99) //user has not stopped program 
     { 
      if (aValue.IntValue > 10 || aValue.IntValue < 0) //valid value 
      { 
       Console.WriteLine("Thank you! Please enter '-99' when you are ready to finsih."); 
       aValue.InValue = Console.ReadLine(); //read input 
       aValue.IntValue = int.Parse(aValue.InValue); //convert string to int 
       number[aValue.IntValue]++; //add input to corresponding array box 
      } 
      else 
      { 
       Console.WriteLine("You have entered an invalid value."); 
       aValue.InvalidValueCount()++; // <-- this is your error 
      } 
     }