我目前正在用C＃做一个非常简单的计算器程序，我的大部分程序工作得很好，因为加法，减法，乘法和除法函数工作正常，虽然我遇到的问题是小数点不是工作正常。错误是当我添加两个带小数的数字时，它无法正常工作。 即如果我添加20和.5，结果将是20.5但是如果我添加20和1.5，答案也将是20.5。我相信这是因为，由于我的代码编写方式，计算器将忽略1.5中的数字1（请参阅下面的代码，因为我相信你们可能知道如何解决这个问题）。任何有关解决此问题的帮助将不胜感激。
（MainPage.xaml代码）
<phone:PhoneApplicationPage
x:Class="Calculator.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
shell:SystemTray.IsVisible="True">
<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!--TitlePanel contains the name of the application and page title-->
<StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
<TextBlock x:Name="ApplicationTitle" Text="Jason Lynch" Style="{StaticResource PhoneTextNormalStyle}"/>
<TextBlock x:Name="PageTitle" Text="Calculator" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
</StackPanel>
<!--ContentPanel - place additional content here-->
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<Button Content="=" Height="116" Margin="218,485,0,0" Name="btnEquals" VerticalAlignment="Top" HorizontalAlignment="Left" Width="127" Background="#FFFF550D" FontSize="56" Click="btnEquals_Click" />
<Button Content="-" Height="116" HorizontalAlignment="Center" Margin="323,485,6,0" Name="btnSubtract" VerticalAlignment="Top" Width="127" FontSize="56" Padding="0,-25,0,0" Click="btnSubtract_Click" />
<Button Content="0" Height="116" HorizontalAlignment="Left" Margin="6,485,0,0" Name="btn0" VerticalAlignment="Top" Width="127" FontSize="56" Click="btn0_Click" />
<Button Content="Clear" Height="73" HorizontalAlignment="Left" Margin="112,485,0,0" Name="btnClear" VerticalAlignment="Top" Width="127" FontSize="28" Background="#FF0008FF" Click="btnClear_Click"></Button>
<Button Content="3" Height="116" HorizontalAlignment="Right" Margin="0,389,111,0" Name="btn3" VerticalAlignment="Top" Width="127" FontSize="56" Click="btn3_Click" />
<Button Content="+" Height="116" HorizontalAlignment="Left" Margin="323,389,0,0" Name="btnAdd" VerticalAlignment="Top" Width="127" FontSize="56" Click="btnAdd_Click" />
<Button Content="1" Height="116" HorizontalAlignment="Left" Margin="6,389,0,0" Name="btn1" VerticalAlignment="Top" Width="127" FontSize="56" Click="btn1_Click" />
<Button Content="2" Height="116" HorizontalAlignment="Left" Margin="112,389,0,0" Name="btn2" VerticalAlignment="Top" Width="127" FontSize="56" Click="btn2_Click" />
<Button Content="6" Height="116" HorizontalAlignment="Right" Margin="0,294,111,0" Name="btn6" VerticalAlignment="Top" Width="127" Click="button9_Click" FontSize="56" />
<Button Content="x" Height="116" HorizontalAlignment="Right" Margin="0,294,6,0" Name="btnMultiply" VerticalAlignment="Top" Width="127" FontSize="56" Click="btnMultiply_Click" />
<Button Content="4" Height="116" HorizontalAlignment="Left" Margin="6,294,0,0" Name="btn4" VerticalAlignment="Top" Width="127" FontSize="56" Click="btn4_Click" />
<Button Content="5" Height="116" HorizontalAlignment="Left" Margin="112,294,0,0" Name="btn5" VerticalAlignment="Top" Width="127" FontSize="56" Click="btn5_Click" />
<Button Content="9" Height="116" HorizontalAlignment="Left" Margin="218,199,0,0" Name="btn9" VerticalAlignment="Top" Width="127" FontSize="56" Click="btn9_Click" />
<Button Content="÷" Height="116" HorizontalAlignment="Left" Margin="323,199,0,0" Name="btnDivide" VerticalAlignment="Top" Width="127" FontSize="56" Click="btnDivide_Click" />
<Button Content="7" Height="116" HorizontalAlignment="Left" Margin="6,199,0,0" Name="btn7" VerticalAlignment="Top" Width="127" FontSize="56" Click="btn7_Click" />
<Button Content="8" Height="116" HorizontalAlignment="Left" Margin="112,199,0,0" Name="btn8" VerticalAlignment="Top" Width="127" FontSize="56" Click="btn8_Click" />
<TextBox Height="72" HorizontalAlignment="Left" Margin="0,65,0,0" Name="resultTxtBox" Text="" VerticalAlignment="Top" Width="460" />
<TextBlock Height="53" HorizontalAlignment="Left" Margin="169,26,0,0" Name="textBlock1" Text="Result" VerticalAlignment="Top" FontSize="36" />
<Button Content="." Height="68" HorizontalAlignment="Left" Margin="112,533,0,0" Name="btnDecimalPoint" VerticalAlignment="Top" Width="127" Click="btnDecimalPoint_Click" HorizontalContentAlignment="Center" />
</Grid>
</Grid>
<!--Sample code showing usage of ApplicationBar-->
<!--<phone:PhoneApplicationPage.ApplicationBar>
<shell:ApplicationBar IsVisible="True" IsMenuEnabled="True">
<shell:ApplicationBarIconButton IconUri="/Images/appbar_button1.png" Text="Button 1"/>
<shell:ApplicationBarIconButton IconUri="/Images/appbar_button2.png" Text="Button 2"/>
<shell:ApplicationBar.MenuItems>
<shell:ApplicationBarMenuItem Text="MenuItem 1"/>
<shell:ApplicationBarMenuItem Text="MenuItem 2"/>
</shell:ApplicationBar.MenuItems>
</shell:ApplicationBar>
</phone:PhoneApplicationPage.ApplicationBar>-->
（MainPage.xaml.cs代码）
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
namespace Calculator
{
public partial class MainPage : PhoneApplicationPage
{
// Constructor
public MainPage()
{
InitializeComponent();
}
private double total1 = 0;
private double total2 = 0;
bool plusButtonClicked = false;
bool minusButtonClicked = false;
bool multiplyButtonClicked = false;
bool divideButtonClicked = false;
private void btn0_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text = resultTxtBox.Text + "0";
}
private void btn1_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text = resultTxtBox.Text + "1";
}
private void btn2_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text = resultTxtBox.Text + "2";
}
private void btn3_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text = resultTxtBox.Text + "3";
}
private void btn4_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text = resultTxtBox.Text + "4";
}
private void btn5_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text = resultTxtBox.Text + "5";
}
//MESSED UP BUTTON *** button9 == btn6
private void button9_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text = resultTxtBox.Text + "6";
}
private void btn7_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text = resultTxtBox.Text + "7";
}
private void btn8_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text = resultTxtBox.Text + "8";
}
private void btn9_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text = resultTxtBox.Text + "9";
}
private void btnAdd_Click(object sender, RoutedEventArgs e)
{
total1 = total1 += double.Parse(resultTxtBox.Text);
resultTxtBox.Text = "";
plusButtonClicked = true;
minusButtonClicked = false;
multiplyButtonClicked = false;
divideButtonClicked = false;
}
private void btnSubtract_Click(object sender, RoutedEventArgs e)
{
total1 = total1 + double.Parse(resultTxtBox.Text);
resultTxtBox.Text = "";
plusButtonClicked = false;
minusButtonClicked = true;
multiplyButtonClicked = false;
divideButtonClicked = false;
}
private void btnMultiply_Click(object sender, RoutedEventArgs e)
{
total1 = total1 + double.Parse(resultTxtBox.Text);
resultTxtBox.Text = "";
plusButtonClicked = false;
minusButtonClicked = false;
multiplyButtonClicked = true;
divideButtonClicked = false;
}
private void btnDivide_Click(object sender, RoutedEventArgs e)
{
total1 = total1 + double.Parse(resultTxtBox.Text);
resultTxtBox.Text = "";
plusButtonClicked = false;
minusButtonClicked = false;
multiplyButtonClicked = false;
divideButtonClicked = true;
}
private void btnEquals_Click(object sender, RoutedEventArgs e)
{
if (plusButtonClicked == true)
{
total2 = total1 + double.Parse(resultTxtBox.Text);
resultTxtBox.Text = total2.ToString();
total1 = 0;
}
else if (minusButtonClicked == true)
{
total2 = total1 - double.Parse(resultTxtBox.Text);
resultTxtBox.Text = total2.ToString();
total1 = 0;
}
else if (multiplyButtonClicked == true)
{
total2 = total1 * double.Parse(resultTxtBox.Text);
resultTxtBox.Text = total2.ToString();
total1 = 0;
}
else if (divideButtonClicked == true)
{
total2 = total1 / double.Parse(resultTxtBox.Text);
resultTxtBox.Text = total2.ToString();
total1 = 0;
}
}
private void btnClear_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text = "";
}
private void btnDecimalPoint_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text = ".";
}
}
}
最后这是我的计算器应用程序的屏幕截图＆gt;＆gt; http://gyazo.com/717b396e32b39d4a42e91ad9cf67cdef
先谢谢你的帮助， 杰森。
答案 0 :(得分：3)
你必须改变
private void btnDecimalPoint_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text = ",";
}
带
private void btnDecimalPoint_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text += ",";
}
答案 1 :(得分：2)
首先，你不必写
resultTxtBox.Text = resultTxtBox.Text + "8";
每一次。只需使用
resultTxtBox.Text += "8";
是一样的。在我看来，它更具可读性。
第二，行
total1 = total1 += double.Parse(resultTxtBox.Text);
是多余的。
total1 += double.Parse(resultTxtBox.Text);
是相同的结果。 ;）
第三，小数点的代码为
private void btnDecimalPoint_Click(object sender, RoutedEventArgs e)
{
resultTxtBox.Text = ".";
}
所以用小数点替换resultTxtBox.Text中的文本。所以我无法想象你怎么能首先写1.5，因为一旦你点击小数点按钮，1就会从文本框中删除。
答案 2 :(得分：0)
在我的计算器中，我为计算器上的小数点按钮创建了一个事件处理程序：
XAML
<Button x:Name ="dot"
Click="dot_Click"
Content="."
Margin="5"
Grid.Row="5"
Grid.Column="2"/>
C＃代码如下：
private void dot_Click(object sender, RoutedEventArgs e)
{
//If the calculator output already contains a ".", do nothing
if (resultLabel.Content.ToString().Contains("."))
{
//Do Nothing
}
else
{
//Otherwise, append "." to the existing output string
resultLabel.Content = $"{resultLabel.Content}.";
}
}
此外，您不必为每个按钮创建一个新方法。您可以对所有数字使用一种方法，然后传递所单击按钮的名称：
private void number_Click(object sender, RoutedEventArgs e)
{
int selectedValue = 0;
if (sender == zero)
selectedValue = 0;
// If the number clicked is "1", "sender" will equal "one"
if (sender == one)
// "selectedValue" will be set to 1
selectedValue = 1;
if (sender == two)
selectedValue = 2;
if (sender == three)
selectedValue = 3;
if (sender == four)
selectedValue = 4;
if (sender == five)
selectedValue = 5;
if (sender == six)
selectedValue = 6;
if (sender == seven)
selectedValue = 7;
if (sender == eight)
selectedValue = 8;
if (sender == nine)
selectedValue = 9;
// If "resultLabel" has not been set to any value already, set it to "selectedValue".
if (resultLabel.Content.ToString() == "0")
{
resultLabel.Content = $"{selectedValue}";
}
// Otherwise append "selectedValue" to the existing number.
else
{
resultLabel.Content = $"{resultLabel.Content}{selectedValue}";
}
// Note: Anytime this method is called, the "selectedValue" will be set to 0. So, if you typed 7 and then clicked + and then typed 77, the "selectedValue" would equal 0 before you clicked 7 and then 0 again before you clicked 77.
}
https://www.hannahsky86.com/2020/03/01/2020-03-01/ 该链接提供了更好的解释。