索引（從零開始）必須大於或等於零並小於參數列表的大小

Question

嘗試調用ToString（）方法時，出現上述錯誤消息。我不確定問題是什麼。這裏是我的代碼：

public override string ToString() 
{ 
    return string.Format("{0} Pizzas @ {1:C}: {2:C}\n" + 
     "{3} Cokes @ {4:C} {5:C}\n" + 
     "Order Amount: {6:C}\n" + 
     "Sales Tax: {7:C}\n" + 
     "Amount Due: {8:C}\n" + 
     "Amount Paid: {9:C}\n" + 
     "Change Due: {10:C}", numberOfPizzas, PIZZA_PRICE + 
     totalCostOfPizza, numberOfCokes, COKE_PRICE, totalCostOfCoke + 
     foodAndDrinkTotal, totalSalesTax, totalAmountDue, amountPaid, + 
     changeDue); 
}   

Answer 1

您引用更多的字符串格式參數，然後您提供。

通過它的外觀，刪除所有加號（參數列表不是字符串連接），並插入逗號

Answer 2

它看起來就像是增加的東西，你不是故意的吧？

試試這個：

public override string ToString() 
{ 
    return string.Format("{0} Pizzas @ {1:C}: {2:C}\n" + 
     "{3} Cokes @ {4:C} {5:C}\n" + 
     "Order Amount: {6:C}\n" + 
     "Sales Tax: {7:C}\n" + 
     "Amount Due: {8:C}\n" + 
     "Amount Paid: {9:C}\n" + 
     "Change Due: {10:C}", numberOfPizzas, PIZZA_PRICE, 
     totalCostOfPizza, numberOfCokes, COKE_PRICE, totalCostOfCoke, 
     foodAndDrinkTotal, totalSalesTax, totalAmountDue, amountPaid, 
     changeDue); 
}