在按钮上运行 Total C# 单击 [重复]

Question

一切正常，但我需要创建一个运行总计来保存所有捐款。它应该显示截至该点的所有捐赠为慈善机构筹集的总金额（即捐赠的总金额减去所有运营成本）。我知道我需要一个 while 循环或执行 while 循环，以便应用程序运行并不断添加数据。我只是不明白为什么这段代码没有产生运行总数。我正在寻求帮助。有什么我忽略的吗？

private decimal donationBFees = 0;

void deductOperatingCost(ref decimal afterFeesParam)
{
    afterFeesParam = afterFeesParam - (afterFeesParam  / 100 * 17);
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    String donationBeforeFees;
    decimal totalDonationRaised;

    donationBeforeFees = donationBox.Text;
    donationBFees = System.Convert.ToDecimal(donationBeforeFees);


    decimal afterFees = donationBFees;
    deductOperatingCost(ref afterFees);
    afterFeesBox.Text = afterFees.ToString("$###, ##0.00");

    decimal total = 0;

    //This is the for loop I'm using to get the running total
    for (int i = 0; i < afterFees; i++)
    {
        total += afterFees;
        totalDonationRaised = total;
        totalDonationsBox.Text = totalDonationRaised.ToString("$###, ##0.00");
    }
}

Answer 1

下面的代码运行正确吗？

private decimal donationBFees = 0;

decimal deductOperatingCost(decimal afterFeesParam)
{
    return afterFeesParam - (afterFeesParam  / 100 * 17);
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    decimal donationBeforeFees = System.Convert.ToDecimal(donationBox.Text);

    decimal afterFees = deductOperatingCost(donationBeforeFees);
    afterFeesBox.Text = afterFees.ToString("$###, ##0.00");

    decimal totalDonationRaised = System.Convert.ToDecimal(totalDonationsBox.Text) + afterFees;
    totalDonationsBox.Text = totalDonationRaised.ToString("$###, ##0.00");
}