Question

internal class Invoice
{
    public static decimal[] Total =
        {
            InvoiceLineItem.quantity[0] * InvoiceLineItem.pricePerUnit[0],
            InvoiceLineItem.quantity[1] * InvoiceLineItem.pricePerUnit[1],
            InvoiceLineItem.quantity[2] * InvoiceLineItem.pricePerUnit[2],
            InvoiceLineItem.quantity[3] * InvoiceLineItem.pricePerUnit[3],
            InvoiceLineItem.quantity[4] * InvoiceLineItem.pricePerUnit[4],
            InvoiceLineItem.quantity[5] * InvoiceLineItem.pricePerUnit[5],
        };

    private decimal total1;
    private decimal total2;

    public void Customer1()
    {
        for (var i = 0; i < 3; i++)
            Console.WriteLine(String.Format("{0,-15} {1,-20} {2,-15} {3,-15} {4,-10}",
                InvoiceLineItem.productNumber[i],
                InvoiceLineItem.description[i],
                InvoiceLineItem.quantity[i],
                InvoiceLineItem.pricePerUnit[i],
                InvoiceLineItem.Total[i]));
    }

    public void Customer2()
    {
        for (var k = 3; k <= 5; k++)
        {
            Console.WriteLine(String.Format("{0,-15} {1,-20} {2,-15} {3,-15:C} {4,-10:C}",
                InvoiceLineItem.productNumber[k],
                InvoiceLineItem.description[k],
                InvoiceLineItem.quantity[k],
                InvoiceLineItem.pricePerUnit[k],
                Total[k]));
        }
    }

    public void Customer1Total()
    {
        for (var i = 0; i <= 2; i++)
        {
            total1 += Total[i];

            Console.WriteLine(String.Format("\nTotal of Customer 1:{0:C}", total1));
        }
    }
}

我很难在方法Customer1Total()中打印一次for循环。我需要输出total1只打印一次，但它会打印3次，逐步添加总计。基本上我只需要这个for循环的最后结果，但我看到了所有的增量。另外，对于额外的信息，我在我的主要方法中调用方法customer1total进行打印。

谢谢。

Answer 1

public void Customer1Total()
{
    for(int i = 0; i <= 2; i++)
    {
        total1 += Invoice.Total[i];            
    }

    //Move write line outside the loop
    Console.WriteLine(String.Format("\nTotal of Customer 1:{0:C}", total1));
}

Answer 2

您的Console.WriteLine语句位于循环体内，之后将其移动以使其在循环结束后执行：

for(int i = 0; i <= 2; i++)
{
    total1 += Invoice.Total[i];
}
Console.WriteLine(String.Format("\nTotal of Customer 1:{0:C}", total1));

另外，请注意，因为total1是类级变量，所以它的值将在调用Customer1Total()之间保持不变，导致每次调用函数时它都会增加。

如何只打印一次for循环？ C＃

2 个答案: