WPF实现一个简单的多运算符表达式计算器，供大家参考，具体内容如下

1.先看下效果图

首先外围给了一个grid 把他分成了两行 第一行用来显示文本框给了一个低于第二行的高度 第二行用来存按钮 窗体的大小自己去调就好了 我这里给的是380x268

<Grid.RowDefinitions> <RowDefinition Height="0.7*"></RowDefinition> <RowDefinition></RowDefinition></Grid.RowDefinitions>

这是一个非常简单的布局 没有用到样式 头部是用了一个Border给一个圆弧实现的 代码如下

<Border Margin="5" Padding="5" Background="White" BorderBrush="Black" BorderThickness="3,5,3,5" CornerRadius="10" VerticalAlignment="Top" Height="130" Width="240"> <TextBlock Name="ShowNumText" Height="100" Width="auto" VerticalAlignment="Top" FontSize="50" HorizontalAlignment="Right" > </TextBlock></Border>

接下来就是按键部分了 用了一个UniformGrid布局 类似于一个表格 给4行4列 最后再往里面添加按钮实现的 分别给每个按钮设置背景颜色，字体颜色以及单击事件（一共4类单击事件 分别是数字的、运算符的、等于号、还有一个清空C）

<UniformGrid Grid.Row="1" Rows="4" Columns="4" Height="200" Width="250"> <Button Name="btn1" Content="1" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btn2" Content="2" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btn3" Content="3" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btnD" Content="÷" FontSize="35" Background="Black" Foreground="White" Click="btnD_Click"/> <Button Name="btn4" Content="4" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btn5" Content="5" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btn6" Content="6" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btnX" Content="X" FontSize="35" Background="Black" Foreground="White" Click="btnD_Click"/> <Button Name="btn7" Content="7" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btn8" Content="8" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btn9" Content="9" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btnM" Content="-" FontSize="35" Background="Black" Foreground="White" Click="btnD_Click"/> <Button Name="btnC" Content="C" FontSize="35" Background="Black" Foreground="White" Click="btnC_Click"/> <Button Name="btn0" Content="0" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btnE" Content="+" FontSize="35" Background="Black" Foreground="White" Click="btnD_Click"/> <Button Name="btnP" Content="=" FontSize="35" Background="Black" Foreground="White" Click="btnP_Click"/></UniformGrid>

这样我们的xaml样式就写完了，接下来就是后端了

上面的代码我们看到我们已经定义了单击事件 首先找到数字的单击事件写上以下代码

var v = sender as Button; switch (v.Content.ToString()) { case "1": ShowNumText.Text += 1; break; case "2": ShowNumText.Text += 2; break; case "3": ShowNumText.Text += 3; break; case "4": ShowNumText.Text += 4; break; case "5": ShowNumText.Text += 5; break; case "6": ShowNumText.Text += 6; break; case "7": ShowNumText.Text += 7; break; case "8": ShowNumText.Text += 8; break; case "9": ShowNumText.Text += 9; break; case "0": ShowNumText.Text += 0; break;

意思就是判断一下用户点击的是哪一个数字 然后把他加到文本框内

接下来就是运算符的单击事件 同理数字的

if (ShowNumText.Text == "") return; var v1 = sender as Button; switch (v1.Content.ToString()) { case "+": ShowNumText.Text += "+"; break; case "-": ShowNumText.Text += "-"; break; case "X": ShowNumText.Text += "X"; break; case "÷": ShowNumText.Text += "÷"; break;}

然后导入命名空间

using System.Data;

这个命名空间里面有一个超级好用的方法Compute
Compute的意思简单来说就是放入一个string类型的带有表达式的字符串计算，
找到等于号的事件 加入代码

try { string str= ShowNumText.Text.Replace('X', '*'); str= str.Replace('÷', '/'); DataTable dt = new DataTable(); string v = dt.Compute(str, null).ToString(); ShowNumText.Text = v.ToString(); } catch { ShowNumText.Text = ""; }

用Replace方法过滤掉 x和÷
因为Compute 是不接收数学的乘和除的

最后在清空事件里加入一个ShowNumText.Text = "";//清空文本框
这样我们的计算器就写完了！！！

前台xaml

<Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:WpfApplication1" mc:Ignorable="d" Title="计算机" Height="380" Width="268"> <Grid> <Grid.RowDefinitions> <RowDefinition Height="0.7*"></RowDefinition> <RowDefinition></RowDefinition> </Grid.RowDefinitions> <Border Margin="5" Padding="5" Background="White" BorderBrush="Black" BorderThickness="3,5,3,5" CornerRadius="10" VerticalAlignment="Top" Height="130" Width="240"> <TextBlock Name="ShowNumText" Height="100" Width="auto" VerticalAlignment="Top" FontSize="50" HorizontalAlignment="Right" > </TextBlock> </Border> <UniformGrid Grid.Row="1" Rows="4" Columns="4" Height="200" Width="250"> <Button Name="btn1" Content="1" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btn2" Content="2" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btn3" Content="3" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btnD" Content="÷" FontSize="35" Background="Black" Foreground="White" Click="btnD_Click"/> <Button Name="btn4" Content="4" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btn5" Content="5" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btn6" Content="6" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btnX" Content="X" FontSize="35" Background="Black" Foreground="White" Click="btnD_Click"/> <Button Name="btn7" Content="7" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btn8" Content="8" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btn9" Content="9" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btnM" Content="-" FontSize="35" Background="Black" Foreground="White" Click="btnD_Click"/> <Button Name="btnC" Content="C" FontSize="35" Background="Black" Foreground="White" Click="btnC_Click"/> <Button Name="btn0" Content="0" FontSize="35" Background="Black" Foreground="White" Click="btn1_Click_1"/> <Button Name="btnE" Content="+" FontSize="35" Background="Black" Foreground="White" Click="btnD_Click"/> <Button Name="btnP" Content="=" FontSize="35" Background="Black" Foreground="White" Click="btnP_Click"/> </UniformGrid> </Grid></Window>

后台代码

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;using System.Data;namespace WpfApplication1{ /// <summary> /// MainWindow.xaml 的交互逻辑 /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void btn1_Click_1(object sender, RoutedEventArgs e)//0-9绑定同一个事件 { var v = sender as Button; switch (v.Content.ToString()) { case "1": ShowNumText.Text += 1; break; case "2": ShowNumText.Text += 2; break; case "3": ShowNumText.Text += 3; break; case "4": ShowNumText.Text += 4; break; case "5": ShowNumText.Text += 5; break; case "6": ShowNumText.Text += 6; break; case "7": ShowNumText.Text += 7; break; case "8": ShowNumText.Text += 8; break; case "9": ShowNumText.Text += 9; break; case "0": ShowNumText.Text += 0; break; } } private void btnD_Click(object sender, RoutedEventArgs e)//运算符也绑定同一个事件 { if (ShowNumText.Text == "") return; var v1 = sender as Button; switch (v1.Content.ToString()) { case "+": ShowNumText.Text += "+"; break; case "-": ShowNumText.Text += "-"; break; case "X": ShowNumText.Text += "X"; break; case "÷": ShowNumText.Text += "÷"; break; } } private void btnP_Click(object sender, RoutedEventArgs e) { try { string str= ShowNumText.Text.Replace('X', '*'); str= str.Replace('÷', '/'); DataTable dt = new DataTable(); string v = dt.Compute(str, null).ToString(); ShowNumText.Text = v.ToString(); } catch { ShowNumText.Text = ""; } } private void btnC_Click(object sender, RoutedEventArgs e) { ShowNumText.Text = "";//清空文本框 } }}

感谢你的观看！

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