用VS制作简易计算器(WPF)

好的，我可以为您提供一份简单的WPF计算器代码示例。以下是步骤：

1. 打开Visual Studio，选择“新建项目”，然后选择“WPF应用程序”模板。
2. 在“MainWindow.xaml”文件中，添加以下XAML代码：

<Window x:Class="Calculator.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Calculator" Height="350" Width="300">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <TextBox Grid.Row="0" Grid.ColumnSpan="4" Text="{Binding Path=Display, UpdateSourceTrigger=PropertyChanged}" FontSize="20" HorizontalContentAlignment="Right"/>
        <Button Grid.Row="1" Grid.Column="0" Content="7" Command="{Binding Path=NumberInputCommand}" CommandParameter="7" FontSize="20"/>
        <Button Grid.Row="1" Grid.Column="1" Content="8" Command="{Binding Path=NumberInputCommand}" CommandParameter="8" FontSize="20"/>
        <Button Grid.Row="1" Grid.Column="2" Content="9" Command="{Binding Path=NumberInputCommand}" CommandParameter="9" FontSize="20"/>
        <Button Grid.Row="1" Grid.Column="3" Content="/" Command="{Binding Path=OperatorInputCommand}" CommandParameter="/" FontSize="20"/>
        <Button Grid.Row="2" Grid.Column="0" Content="4" Command="{Binding Path=NumberInputCommand}" CommandParameter="4" FontSize="20"/>
        <Button Grid.Row="2" Grid.Column="1" Content="5" Command="{Binding Path=NumberInputCommand}" CommandParameter="5" FontSize="20"/>
        <Button Grid.Row="2" Grid.Column="2" Content="6" Command="{Binding Path=NumberInputCommand}" CommandParameter="6" FontSize="20"/>
        <Button Grid.Row="2" Grid.Column="3" Content="*" Command="{Binding Path=OperatorInputCommand}" CommandParameter="*" FontSize="20"/>
        <Button Grid.Row="3" Grid.Column="0" Content="1" Command="{Binding Path=NumberInputCommand}" CommandParameter="1" FontSize="20"/>
        <Button Grid.Row="3" Grid.Column="1" Content="2" Command="{Binding Path=NumberInputCommand}" CommandParameter="2" FontSize="20"/>
        <Button Grid.Row="3" Grid.Column="2" Content="3" Command="{Binding Path=NumberInputCommand}" CommandParameter="3" FontSize="20"/>
        <Button Grid.Row="3" Grid.Column="3" Content="-" Command="{Binding Path=OperatorInputCommand}" CommandParameter="-" FontSize="20"/>
        <Button Grid.Row="4" Grid.Column="0" Content="0" Command="{Binding Path=NumberInputCommand}" CommandParameter="0" FontSize="20"/>
        <Button Grid.Row="4" Grid.Column="1" Content="." Command="{Binding Path=NumberInputCommand}" CommandParameter="." FontSize="20"/>
        <Button Grid.Row="4" Grid.Column="2" Content="=" Command="{Binding Path=EqualsCommand}" FontSize="20"/>
        <Button Grid.Row="4" Grid.Column="3" Content="+" Command="{Binding Path=OperatorInputCommand}" CommandParameter="+" FontSize="20"/>
    </Grid>
</Window>

3. 在“MainWindow.xaml.cs”文件中，添加以下C#代码：

using System;
using System.ComponentModel;
using System.Windows;
using System.Windows.Input;

namespace Calculator
{
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        private string _display;
        private string _currentValue;
        private string _previousValue;
        private string _currentOperator;

        public ICommand NumberInputCommand { get; set; }
        public ICommand OperatorInputCommand { get; set; }
        public ICommand EqualsCommand { get; set; }

        public string Display
        {
            get { return _display; }
            set
            {
                _display = value;
                OnPropertyChanged("Display");
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        public MainWindow()
        {
            InitializeComponent();

            DataContext = this;

            NumberInputCommand = new RelayCommand<string>(NumberInput);
            OperatorInputCommand = new RelayCommand<string>(OperatorInput);
            EqualsCommand = new RelayCommand<object>(EqualsInput);

            _currentValue = "";
            _previousValue = "";
            _currentOperator = "";
        }

        private void NumberInput(string parameter)
        {
            _currentValue += parameter;
            Display = _currentValue;
        }

        private void OperatorInput(string parameter)
        {
            if (_currentValue != "")
            {
                if (_previousValue != "" && _currentOperator != "")
                {
                    EqualsInput(null);
                }

                _previousValue = _currentValue;
                _currentValue = "";
                _currentOperator = parameter;
            }
        }

        private void EqualsInput(object parameter)
        {
            if (_previousValue != "" && _currentOperator != "" && _currentValue != "")
            {
                double prev = double.Parse(_previousValue);
                double curr = double.Parse(_currentValue);

                switch (_currentOperator)
                {
                    case "+":
                        _previousValue = (prev + curr).ToString();
                        break;
                    case "-":
                        _previousValue = (prev - curr).ToString();
                        break;
                    case "*":
                        _previousValue = (prev * curr).ToString();
                        break;
                    case "/":
                        _previousValue = (prev / curr).ToString();
                        break;
                }

                _currentValue = "";
                _currentOperator = "";
            }

            Display = _previousValue;
        }
    }

    public class RelayCommand<T> : ICommand
    {
        private Action<T> _execute;

        public RelayCommand(Action<T> execute)
        {
            _execute = execute;
        }

        public bool CanExecute(object parameter)
        {
            return true;
        }

        public void Execute(object parameter)
        {
            _execute((T)parameter);
        }

        public event EventHandler CanExecuteChanged;
    }
}

这个简单的计算器可以执行加、减、乘、除四个基本运算，您可以根据需要对代码进行修改和扩展。