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使用WPF編寫一個(gè)多運(yùn)算符表達(dá)式計(jì)算器

發(fā)布時(shí)間：2020-11-09 15:01:29 來源：億速云 閱讀：206 作者：Leah 欄目：開發(fā)技術(shù)

使用WPF編寫一個(gè)多運(yùn)算符表達(dá)式計(jì)算器？很多新手對(duì)此不是很清楚，為了幫助大家解決這個(gè)難題，下面小編將為大家詳細(xì)講解，有這方面需求的人可以來學(xué)習(xí)下，希望你能有所收獲。

WPF實(shí)現(xiàn)一個(gè)簡單的多運(yùn)算符表達(dá)式計(jì)算器

1.先看下效果圖在這里插入圖片描述

首先外圍給了一個(gè)grid 把他分成了兩行 第一行用來顯示文本框給了一個(gè)低于第二行的高度 第二行用來存按鈕 窗體的大小自己去調(diào)就好了 我這里給的是380x268

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

這是一個(gè)非常簡單的布局 沒有用到樣式 頭部是用了一個(gè)Border給一個(gè)圓弧實(shí)現(xiàn)的 代碼如下

<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>

接下來就是按鍵部分了 用了一個(gè)UniformGrid布局 類似于一個(gè)表格 給4行4列 最后再往里面添加按鈕實(shí)現(xiàn)的 分別給每個(gè)按鈕設(shè)置背景顏色，字體顏色以及單擊事件（一共4類單擊事件 分別是數(shù)字的、運(yùn)算符的、等于號(hào)、還有一個(gè)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>

這樣我們的xaml樣式就寫完了，接下來就是后端了

上面的代碼我們看到我們已經(jīng)定義了單擊事件 首先找到數(shù)字的單擊事件寫上以下代碼

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;

意思就是判斷一下用戶點(diǎn)擊的是哪一個(gè)數(shù)字 然后把他加到文本框內(nèi)

接下來就是運(yùn)算符的單擊事件 同理數(shù)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;
}

然后導(dǎo)入命名空間

using System.Data;

這個(gè)命名空間里面有一個(gè)超級(jí)好用的方法Compute
Compute的意思簡單來說就是放入一個(gè)string類型的帶有表達(dá)式的字符串計(jì)算，
找到等于號(hào)的事件 加入代碼

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方法過濾掉 x和÷
因?yàn)镃ompute 是不接收數(shù)學(xué)的乘和除的

最后在清空事件里加入一個(gè)ShowNumText.Text = "";//清空文本框
這樣我們的計(jì)算器就寫完了！?。?/p>

前臺(tái)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="計(jì)算機(jī)" 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>

后臺(tái)代碼

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 的交互邏輯
  /// </summary>
  public partial class MainWindow : Window
  {
    public MainWindow()
    {
      InitializeComponent();
      
    }
    private void btn1_Click_1(object sender, RoutedEventArgs e)//0-9綁定同一個(gè)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)//運(yùn)算符也綁定同一個(gè)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
    }
  }
}

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