Question

我已完成大部分代码，但现在我不知道在何处以及如何开始计算月付款。我已将输入传递给局部变量。我确实尝试在底部计算。所以请帮助我。

Answer 1

你没有使用MVVM模式，所以你的回调应该在'代码隐藏'中。使用WPF自动完成：

MortgageCalculator.MainWindow

<Button Click="HERE!!!">
    <Button.Effect>
        <DropShadowEffect BlurRadius="2" Color="#FF7E7979" ShadowDepth="2"/>
    </Button.Effect>
</Button>

它会在后面的代码中创建回调（而不是像你一样在窗口中创建）。在MortgageCalculator.MainWindow.xaml.cs：

/// <summary>
/// Interaction logic for MortgageCalculator.xaml
/// </summary>
public partial class MortgageCalculator : UserControl
{
    public MortgageCalculator()
    {
        InitializeComponent();
    }


    private void somecallback(object sender, RoutedEventArgs e)
    {
    }
}

Answer 2

记下已注释或移动的return语句。此外，付款计算的更正版本：

private void btnsubmit_Click(object sender, RoutedEventArgs e)
{

    {
        double monthlypayment = 0;

        //Tryparse for principal amount with error Red texbox
        if (String.IsNullOrEmpty(txtprincipal.Text) || !double.TryParse(txtprincipal.Text, out principal))
        {
            txtprincipal.BorderBrush = new SolidColorBrush(Colors.Red);
            return;
        }
        else
            txtprincipal.BorderBrush = new SolidColorBrush(Colors.Black);



        //Validate radio button
        if (rad10years.IsChecked.Value)
        {
            years = 10;
            //return;
        }
        else if (rad20years.IsChecked.Value)
        {
            years = 20;
            //return;
        }
        else if (rad30years.IsChecked.Value)
        {
            years = 30;
            //return;
        }
        else if (radother.IsChecked == true)
        {
            if (!double.TryParse(txtother.Text, out years))
            {
                MessageBox.Show("Not a Valid year.");
                return;
            }
            //return;
        }
        else
        {
            MessageBox.Show("Please select number of years.");
            stkrdobtns.Background = new SolidColorBrush(Colors.Red);
            return;
        }

        //monthlypayment = ((principal * rate) / 1200) / Math.Pow(1 - (1.0 + rate / 1200), (-12.0 * years));

        var r = rate / 1200.0;
        var n = years * 12.0;
        monthlypayment = principal * ((r * Math.Pow((1 + r), n)) / (Math.Pow(1 + r, n) - 1));
        string MonthPay = string.Format("The amount of the monthly payment is: {0:c}", monthlypayment);
        MessageBox.Show(MonthPay);
    }
}

C＃/ WPF我不知道如何以及在何处计算按揭计算器的月付款

2 个答案: