如何从C#(ASP.NET)中的函数返回多个值？

Question

我有一个页面,其中有一些产品和用户输入数字的文本字段.我首先使用JavaScript来计算总成本.根据他们输入的用户数量,他们获得不同的费率(如下面的代码所示).当用户在文本字段中键入或粘贴数字时,将调用函数CalculateCost调用其他函数(仅在示例中显示两个函数,CDCOst和DVDCost),以确保每月成本和年度成本字段显示正确的值.

我当然希望在插入数据库之前在后面的代码中进行最终计算.如何在C#中实现类似的功能？

function CDCost() {
                var monthlyAmount;
                var annualAmount;
                var amount;
                var users = $('#txtCD').val();

            if (users > 0 && users < 100) {
                amount = users * 14.95;
                monthlyAmount = amount;
                annualAmount = monthlyAmount * 12;
                return [monthlyAmount, annualAmount];
            }
            if (users >= 100 && users <= 250) {
                amount = users * 12.95;
                monthlyAmount = amount;
                annualAmount = monthlyAmount * 12;
                return [monthlyAmount, annualAmount];
            }
            if (users == 0) {
                monthlyAmount = 0;
                annualAmount = 0;
                return [monthlyAmount, annualAmount];
            }
        }

function DVDCost() {
                var monthlyAmount;
                var annualAmount;
                var amount;
                var users = $('#txtDVD').val();

            if (users > 0 && users < 100) {
                amount = users * 16.95;
                monthlyAmount = amount;
                annualAmount = monthlyAmount * 12;
                return [monthlyAmount, annualAmount];
            }
            if (users >= 100 && users <= 250) {
                amount = users * 14.95;
                monthlyAmount = amount;
                annualAmount = monthlyAmount * 12;
                return [monthlyAmount, annualAmount];
            }
            if (users == 0) {
                monthlyAmount = 0;
                annualAmount = 0;
                return [monthlyAmount, annualAmount];
            }
        }


        function CalculateCost() {
            var cd = CDCost();
            var dvd = DVDCost();

            var monthlyCost = cd[0] + dvd[0];
            var annualCost = cd[1] + dvd[1];

            return [monthlyCost, annualCost];
        }

        $('#txtCD').bind('keyup change', function (ev) {
            var cost = CalculateCost();
            var monthly = cost[0];
            var annual = cost[1];

            $('#MonthlyCostSum').text(monthly);
            $('#AnnualCostSum').text(annual)
        });

我将如何在C#中继续这样做？

就像是:

protected double CDCost()
    {
        double monthlyAmount;
        double annualAmount;
        double amount;
        double users = Convert.ToDouble(txtCD.Text);

        if (users > 0 && users < 100)
    {
        amount = users * 14.95;
        monthlyAmount = amount;
        annualAmount = monthlyAmount * 12;
        return //how do I return the values here to a CalculateCost function?
    }


}

Answer 1

要么使用out参数,要么创建一个包含所有要返回的东西的新类型(所谓的"属性包"):

class ReportData
{
    public double MonthlyAmount { get; set; }
    public double AnnualAmount { get; set; }
    public double Amount { get; set; }
}

...

protected ReportData CDCost()
{
    return new ReportData() 
        { 
            Amount = users * 14.95
            MonthlyAmount = amount, 
            AnnualAmount = amount * 12.0,
        };
}