如何强制重复输入？

Question

这段代码适用于我，除了它只检查一次重复，并且如果用户再次输入相同的整数，程序将第二次接受它。无论用户输入多少次，我如何让这个程序不接受输入？

 int[] shippedOrderNumbers = new int[5]; 

     Console.WriteLine("Please Input first Shipping Number: "); 
     shippedOrderNumbers[0] = Convert.ToInt32(Console.ReadLine());   

     Console.WriteLine("Please Input second Shipping Number: "); 
     shippedOrderNumbers[1] = Convert.ToInt32(Console.ReadLine());   


     if (shippedOrderNumbers[0] == shippedOrderNumbers[1]) 
     { 
      Console.WriteLine("A dublicate number is not allowed please try again: "); 
      shippedOrderNumbers[1] =Convert.ToInt32(Console.ReadLine());    
     }   

      Console.WriteLine("Please Input third Shipping Number: "); 
      shippedOrderNumbers[2] = Convert.ToInt32(Console.ReadLine()); 


     if (shippedOrderNumbers[0] == shippedOrderNumbers[2] || shippedOrderNumbers[1] == shippedOrderNumbers[2]) 
     { 
      Console.WriteLine("A dublicate number is not allowed please try again: "); 
      shippedOrderNumbers[2] = Convert.ToInt32(Console.ReadLine()); 
     }       
      Console.WriteLine("Please Input fourth Shipping Number: "); 
      shippedOrderNumbers[3] = onvert.ToInt32(Console.ReadLine());    


     if (shippedOrderNumbers[0] == shippedOrderNumbers[3] || shippedOrderNumbers[1] == shippedOrderNumbers[3] || shippedOrderNumbers[2] == shippedOrderNumbers[3]) 
     { 
      Console.WriteLine("A dublicate number is not allowed please try again: "); 
      shippedOrderNumbers[3] = Convert.ToInt32(Console.ReadLine()); 
     }       
      Console.WriteLine("Please Input fifth Shipping Number: "); 
      shippedOrderNumbers[4] = Convert.ToInt32(Console.ReadLine()); 


     if (shippedOrderNumbers[0] == shippedOrderNumbers[4] || shippedOrderNumbers[1] == shippedOrderNumbers[4] || shippedOrderNumbers[2] == shippedOrderNumbers[4] || shippedOrderNumbers[3] == shippedOrderNumbers[4]) 
     { 
      Console.WriteLine("A dublicate number is not allowed please try again: "); 
      shippedOrderNumbers[4] = Convert.ToInt32(Console.ReadLine()); 
     }   

Answer 1

我想你会更好地使用通用列表而不是数组。您还可以使用简单的循环来简化代码。有关示例，请参阅以下内容。

IList<int> shippedOrderNumbers = new List<int>(); 

for (int = 0; i < 5; i++) 
{ 
    Console.WriteLine("Please input the Shipping Number: "); 

    int shippingNumber; 
    if (!Int.TryParse(Console.ReadLine(), out shippingNumber) 
    { 
     Console.WriteLine("Your shipping number is not an integer"); 
    } 

    if (shippedOrderNumbers.Contains(shippingNumber)) 
    { 
     Console.WriteLine("This shipping number has already been entered."); 
    } 
    else 
    { 
     shippedOrderNumbers.Add(shippingNumber); 
     Console.WriteLine("Thanks for submitting your shipping number."); 
    } 
} 

PS。我在记事本中写道，所以它可能不起作用，但应该给你一个关于如何解决你的问题的一般指导。

Answer 2

东西沿着这些线路应该这样做：

var shippedOrderNumbers = new List<int>(); 

var validOrderNumbers = 0; 

while(validOrderNumbers < 5) 
{ 
    Console.WriteLine("Input order number:"); 
    var nextOrderNumber = Convert.ToInt32(Console.ReadLine()); 
    if(shippedOrderNumbers.Any(son => son == nextOrderNumber)) 
    { 
     Console.WriteLine("Duplicate order number. Please enter another"); 
     continue; 
    } 
    shippedOrderNumbers.Add(nextOrderNumber); 
    validOrderNumbers++; 
}