索引（从零开始）必须大于或等于零并小于参数列表的大小

Question

尝试调用ToString（）方法时，出现上述错误消息。我不确定问题是什么。这里是我的代码：

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参数，然后您提供。

通过它的外观，删除所有加号（参数列表不是字符串连接），并插入逗号

Answer 2

它看起来就像是增加的东西，你不是故意的吧？

试试这个：

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); 
}