wpf简易计算器的MainWindow类

以下是一个简易计算器的WPF应用程序中的MainWindow类示例：

using System;
using System.Windows;
using System.Windows.Controls;

namespace Calculator
{
    public partial class MainWindow : Window
    {
        private double num1, num2, result;
        private string operation;

        public MainWindow()
        {
            InitializeComponent();
        }

        private void NumberButton_Click(object sender, RoutedEventArgs e)
        {
            Button button = (Button)sender;
            if (operation == null)
            {
                num1 = num1 * 10 + Convert.ToDouble(button.Content.ToString());
                ResultLabel.Content = num1;
            }
            else
            {
                num2 = num2 * 10 + Convert.ToDouble(button.Content.ToString());
                ResultLabel.Content = num2;
            }
        }

        private void OperationButton_Click(object sender, RoutedEventArgs e)
        {
            Button button = (Button)sender;
            operation = button.Content.ToString();
        }

        private void EqualsButton_Click(object sender, RoutedEventArgs e)
        {
            switch (operation)
            {
                case "+":
                    result = num1 + num2;
                    break;
                case "-":
                    result = num1 - num2;
                    break;
                case "*":
                    result = num1 * num2;
                    break;
                case "/":
                    result = num1 / num2;
                    break;
            }
            ResultLabel.Content = result;
            num1 = result;
            num2 = 0;
            operation = null;
        }

        private void ClearButton_Click(object sender, RoutedEventArgs e)
        {
            num1 = 0;
            num2 = 0;
            operation = null;
            ResultLabel.Content = "0";
        }
    }
}

该类包含了按钮点击事件的处理程序，用于处理数字、运算符和清除按钮的点击。通过使用num1、num2和operation变量来追踪计算器的状态。当数字按钮被点击时，它们被添加到num1或num2中，当运算符按钮被点击时，它们被设置为operation变量，当等号按钮被点击时，通过执行适当的操作计算结果。最后，当清除按钮被点击时，计算器被复位。