WPF实现键盘鼠标输入简易计算器
使用的开发工具为VS2010，简单操作如下：
首先创建项目，整体为单页面应用
在App.xaml中指明启动初始页面
q前台代码
MainWindow.xaml
"Calculator.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="计算器" Height="600" Width="400" Icon="Images/calculatorIcon.png" KeyDown="Calcluator_KeyDown"> "3*"> "2*"> "2*"> "2*"> "2*"> "2*"> "0" Grid.ColumnSpan="4" Height="Auto" Name="textBlockExpression" Margin="0,0,15,0" HorizontalAlignment="Right" FontSize="36" Width="Auto"/> "0" Grid.ColumnSpan="4" Height="60" Name="textBlockResult" Margin="0,0,15,0" HorizontalAlignment="Right" FontSize="36" Text="0" />
MainWindow.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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;
namespace Calculator
{
///
/// 计算器交互逻辑
///
public partial class MainWindow : Window
{
///
/// 计算结果值
///
private double m_dResult = 0.0;
///
/// 运算符号标记
///
private string m_strOperator = "";
public MainWindow()
{
InitializeComponent ();
}
///
/// 数字按钮鼠标点击事件方法
///
///
///
private void buttonNum_Click(object sender, RoutedEventArgs e)
{
if (m_strOperator == "=")
defaultCalcluator (e);
string strCurrentNum = ((Button)sender).Content.ToString ();
inputNum (strCurrentNum);
}
///
/// 键盘或鼠标输入数字方法
///
///
private void inputNum(string strInputNum)
{
if (m_strOperator != "")
{
string strCurrentExpression = textBlockExpression.Text;
string strSufExperssion = strCurrentExpression.Substring (strCurrentExpression.Length - 1, 1);
//计算表达式最后一位不是符号
if (isSufOperatorMark (strSufExperssion))
{
textBlockResult.Text = strInputNum;
}
else
{
textBlockResult.Text = textBlockResult.Text + strInputNum;
}
textBlockExpression.Text = textBlockExpression.Text + strInputNum;
}
else
{
//输入第一个数字为0情况判断
if (textBlockResult.Text == "0" && strInputNum != ".")
{
textBlockResult.Text = strInputNum;
textBlockExpression.Text = strInputNum;
}
else
{
textBlockResult.Text = textBlockResult.Text + strInputNum;
textBlockExpression.Text = textBlockExpression.Text + strInputNum;
}
}
}
///
/// 运算符号按钮鼠标点击事件方法
///
///
///
private void buttonMark_Click(object sender, RoutedEventArgs e)
{
string strCurrentMark = ((Button)sender).Content.ToString ();
inputOperationMark (strCurrentMark);
}
///
/// 键盘或鼠标输入运算符号方法
///
///
private void inputOperationMark(string strInputMark)
{
string strCurrentExpression = textBlockExpression.Text;
if (!string.IsNullOrEmpty (strCurrentExpression))
{
string strSufExperssion = strCurrentExpression.Substring (strCurrentExpression.Length - 1, 1);
if (isSufOperatorMark (strSufExperssion))
{
//防止重复输入运算符号
if (strInputMark != strSufExperssion)
{
//可以修改不同运算符号
m_strOperator = strInputMark;
textBlockExpression.Text = strCurrentExpression.Substring (0, strCurrentExpression.Length - 1) + strInputMark;
}
}
else
{
textBlockExpression.Text = textBlockExpression.Text + strInputMark;
OperationNum (strInputMark);
textBlockResult.Text = m_dResult.ToString ();
}
}
}
///
/// 数值计算
///
///
private void OperationNum(string strMark)
{
switch (m_strOperator)
{
case "":
m_dResult = double.Parse (textBlockResult.Text);
m_strOperator = strMark;
break;
case "+":
m_dResult = m_dResult + double.Parse (textBlockResult.Text);
m_strOperator = strMark;
break;
case "-":
m_dResult = m_dResult - double.Parse (textBlockResult.Text);
m_strOperator = strMark;
break;
case "×":
m_dResult = m_dResult * double.Parse (textBlockResult.Text);
m_strOperator = strMark;
break;
case "÷":
if (textBlockResult.Text == "0")
{
MessageBox.Show ("除数不能为0！");
textBlockExpression.Text = "";
textBlockResult.Text = "0";
m_strOperator = "";
//m_dResult = 0.0;
}
else
{
m_dResult = m_dResult / double.Parse (textBlockResult.Text);
m_strOperator = strMark;
}
break;
default:
break;
}
}
///
/// 判断输入的计算表达式最后一位是运算符号
///
///
///
/// “=”按钮点击事件方法
///
///
///
private void buttonEqual_Click(object sender, RoutedEventArgs e)
{
//防止打开计算器直接按等于
if (m_strOperator != "")
{
textBlockExpression.Text = textBlockExpression.Text + "=";
OperationNum ("=");
textBlockResult.Text = m_dResult.ToString ();
}
}
///
/// 退格按钮点击事件方法
///
///
///
private void buttonDelete_Click(object sender, RoutedEventArgs e)
{
string strCurrentResult = textBlockResult.Text;
if (!string.IsNullOrEmpty (strCurrentResult))
textBlockResult.Text = strCurrentResult.Substring (0, strCurrentResult.Length - 1);
else
{
textBlockResult.Text = "0";
//textBlockExpression.Text = "";
}
}
///
/// 清空按钮点击事件方法
///
///
///
private void buttonClear_Click(object sender, RoutedEventArgs e)
{
defaultCalcluator (e);
}
///
/// 计算器回归默认值
///
public void defaultCalcluator(RoutedEventArgs e)
{
textBlockExpression.Text = "";
textBlockResult.Text = "0";
m_strOperator = "";
m_dResult = 0.0;
}
///
/// 键盘按键输入事件方法
///
///
///
private void Calcluator_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyStates == Keyboard.GetKeyStates (Key.OemPlus) && Keyboard.Modifiers == ModifierKeys.Shift)
{
inputOperationMark ("+");
}
if (e.KeyStates == Keyboard.GetKeyStates (Key.OemMinus))
{
inputOperationMark ("-");
}
if (e.KeyStates == Keyboard.GetKeyStates (Key.OemQuestion))
{
inputOperationMark ("÷");
}
if (e.Key == Key.Return)
{
//防止打开计算器直接按等于
if (m_strOperator != "")
{
textBlockExpression.Text = textBlockExpression.Text + "=";
OperationNum ("=");
textBlockResult.Text = m_dResult.ToString ();
}
}
if (e.KeyStates == Keyboard.GetKeyStates (Key.D0))
{
inputNum ("0");
}
if (e.KeyStates == Keyboard.GetKeyStates (Key.D1))
{
inputNum ("1");
}
if (e.Key == Key.D2)
{
inputNum ("2");
}
if (e.KeyStates == Keyboard.GetKeyStates (Key.D3))
{
inputNum ("3");
}
if (e.KeyStates == Keyboard.GetKeyStates (Key.D4))
{
inputNum ("4");
}
if (e.KeyStates == Keyboard.GetKeyStates (Key.D5))
{
inputNum ("5");
}
if (e.KeyStates == Keyboard.GetKeyStates (Key.D6))
{
inputNum ("6");
}
if (e.KeyStates == Keyboard.GetKeyStates (Key.D7))
{
inputNum ("7");
}
if (e.KeyStates == Keyboard.GetKeyStates (Key.D8))
{
inputNum ("8");
}
if (e.KeyStates == Keyboard.GetKeyStates (Key.D9))
{
inputNum ("9");
}
//小数点
if (e.KeyStates == Keyboard.GetKeyStates (Key.OemPeriod))
{
inputNum (".");
}
//键盘退格符
if (e.KeyStates == Keyboard.GetKeyStates (Key.Back))
{
string strCurrentResult = textBlockResult.Text;
if (!string.IsNullOrEmpty (strCurrentResult))
textBlockResult.Text = strCurrentResult.Substring (0, strCurrentResult.Length - 1);
{
textBlockResult.Text = "0";
//textBlockExpression.Text = "";
}
}
//键盘Del键全部清空
if (e.KeyStates == Keyboard.GetKeyStates (Key.Delete))
{
textBlockExpression.Text = "";
textBlockResult.Text = "0";
m_strOperator = "";
m_dResult = 0.0;
}
}
}
}
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原文：https://www.cnblogs.com/LiuFqiang/p/13429632.html