vs 2013 windowsphone 编程discount calculator错误提示
要编写一个discount calculator的windows phone应用程序,相应程序编写如下:using System;
using System.Collections.Generic;
using
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
// “空白页”项模板在 http://go. 上有介绍
namespace App1
{
/// <summary>
/// 可用于自身或导航至 Frame 内部的空白页。
/// </summary>
public sealed partial class MainPage : Page
{
public MainPage()
{
this.InitializeComponent();
this.NavigationCacheMode = NavigationCacheMode.Required;
}
/// <summary>
/// 在此页将要在 Frame 中显示时进行调用。
/// </summary>
/// <param name="e">描述如何访问此页的事件数据。
/// 此参数通常用于配置页。</param>
private void amountTextBox_LostFocus(object sender, RoutedEventArgs e)
{
billAmountTextBox.Text = tip.BillAmount;
}
private void billAmountTextBox_TextChanged(object sender, TextChangedEventArgs e)
{
performCalculation();
}
private void performCalculation()
{
var selectedRadio = myStackPanel.Children.OfType<RadioButton>().FirstOrDefault(r => r.IsChecked == true);
tip.CalculateTip(billAmountTextBox.Text, double.Parse(selectedRadio.Tag.ToString()));
amountToTipTextBlock.Text = tip.TipAmount;
totalTextBlock.Text = tip.TotalAmount;
}
public class Tip
{
public string BillAmount { get; set; }
public string TipAmount { get; set; }
public string TotalAmount { get; set; }
public Tip()
{
this.BillAmount = String.Empty;
this.TipAmount = String.Empty;
this.TotalAmount = String.Empty;
}
public void CalculateTip(string originalAmount, double tipPercentage)
{
double billAmount = 0.0;
double tipAmount = 0.0;
double totalAmount = 0.0;
if (double.TryParse(originalAmount.Replace('$', ' '), out billAmount))
{
tipAmount = billAmount * tipPercentage;
totalAmount = billAmount - tipAmount;
}
this.BillAmount = String.Format("{0:C}", billAmount);
this.TipAmount = String.Format("{0:C}", tipAmount);
this.TotalAmount = String.Format("{0:C}", totalAmount);
}
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
// TODO: 准备此处显示的页面。
// TODO: 如果您的应用程序包含多个页面,请确保
// 通过注册以下事件来处理硬件“后退”按钮:
// Windows.Phone.UI.Input.HardwareButtons.BackPressed 事件。
// 如果使用由某些模板提供的 NavigationHelper,
// 则系统会为您处理该事件。
}
}
}
然后提示错误:
老师要求得到像这样的结果:
求助大神这到底是怎么回事啊。。。。单纯的菜鸟,不是学计算机的但是作死选了嵌入式的选修课,希望大神们能就一命,马上就要交作业了哭
[此贴子已经被作者于2016-4-16 12:13编辑过]