使用WPF編寫一個多運算符表達式計算器

發布時間：2020-11-09 15:01:29 來源：億速云閱讀：211 作者：Leah 欄目：開發技術

使用WPF編寫一個多運算符表達式計算器？很多新手對此不是很清楚，為了幫助大家解決這個難題，下面小編將為大家詳細講解，有這方面需求的人可以來學習下，希望你能有所收獲。

WPF實現一個簡單的多運算符表達式計算器

1.先看下效果圖在這里插入圖片描述

首先外圍給了一個grid 把他分成了兩行第一行用來顯示文本框給了一個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>

這是一個非常簡單的布局沒有用到樣式頭部是用了一個Border給一個圓弧實現的代碼如下

<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UniformGrid布局類似于一個表格給4行4列最后再往里面添加按鈕實現的分別給每個按鈕設置背景顏色，字體顏色以及單擊事件（一共4類單擊事件分別是數字的、運算符的、等于號、還有一個清空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定義了單擊事件首先找到數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擊的是哪一個數字然后把他加到文本框內

接下來就是運算符的單擊事件同理數字的

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;
}

然后導入命名空間

using System.Data;

這個命名空間里面有一個超級好用的方法Compute
Compute的意思簡單來說就是放入一個string類型的帶有表達式的字符串計算，
找到等于號的事件加入代碼

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÷
因為Compute 是不接收數學的乘和除的

最后在清空事件里加入一個ShowNumText.Text = "";//清空文本框
這樣我們的計算器就寫完了！！！

前臺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="計算機" 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)//運算符也綁定同一個事件
    {
      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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