驗證用戶輸入爲數字，然後作爲整數使用Tryparse

Question

我必須創建一個程序，通過檢查輸入是數字，整數還是範圍內來驗證用戶輸入。如果不正確，每個錯誤消息都必須提供。我不知道如何驗證數字，然後作爲整數，並提供每個單獨問題的錯誤消息（如果用戶輸入「十」提供消息「必須數字」，如果用戶輸入「10.1」提供消息「必須是一個整數」。任何建議？

 const int INPUT_MIN = 0;  
     const int INPUT_MAX = 50; 
     const int DAILY_COUNT = 7; 

     double totalVehicles = 0.0; 
     int avgDailyVehicles = 0; 
     int highestDay = 0;   
     int lowestDay = 0;   
     int dailySold = 0;   
     string userInput = "";  
     int[] salesArray = new int[DAILY_COUNT];  

     do { 
      for (int dayCount = 1; dayCount <= salesArray.Length; dayCount++) 
      { 

       Console.Write("Please enter the number of vehicles sold on day " + dayCount + ": "); 

       { 

        if (Int32.TryParse(Console.ReadLine(), out dailySold)) 
        { 

         if ((dailySold >= INPUT_MIN && dailySold <= INPUT_MAX)) 
         { 

          salesArray[dayCount - 1] = dailySold; 
         } 

         else 
         { 

          Console.WriteLine("\n" + dailySold + " is not a valid entry. "); 
          Console.WriteLine("The amount must be between {0} and {1}. Please try again.", INPUT_MIN, INPUT_MAX); 
          dayCount--; 
         } 
        } 

        else 
        { 

         Console.WriteLine("\n" + dailySold + " is not a valid entry. "); 
         Console.WriteLine("The amount must be a whole number. Please try again."); 
         dayCount--; 


        } 

       } 
      } 

Answer 1

使用Decimal.TryParse的數字，併爲Int64.TryParse整體。