WPF

Calculate计算类；

public  class Calculate    
    {
        private double x;//第一个数

        public double X//封装字段
        {
            get { return x; }
            set { x= value; }
        }
        private double y;//第二个数字段封装

        public double Y
        {
            get { return y; }
            set { y = value; }
        }
        public double result;
        public virtual double Result()／／利用多态实现简单工厂模式
        {
            return result;
        }

    }
    public class Add : Calculate//派生加法类
    {
        public override double Result()//重写基类中的方法，进行计算
        {
            result = X + Y;
            return result;
        }
    }
    public class Sub : Calculate
    {
        public override double Result()
        {
            result = X - Y;
            return result;
        }
    }
    public class Mul : Calculate
    {
        public override double Result()
        {
            result = X * Y;
            return result;
        }

    }
    public class Div : Calculate
    {
        public override double Result()
        {
            result = X / Y;
            return result;

        }
    public class Mod : Calculate
    {
        public override double Result()
        {
            if (X == 0)
            {
                MessageBox.Show("分母不能为零");
            }
            result = X % Y;
            return result;

        }


    }

public class calculate//运算类型
    {
        public static Calculate Cal(string type)//派生一个为Calculate类型的Cal
        {
            Calculate cal = null;switch (type)
            {
                case "+":
                    cal = new Add();    //加法
                    break;
                case "-":
                    cal = new Sub();
                    break;
                case "*":
                    cal = new Mul();
                    break;
                case "/":
                    cal = new Div();
                    break;
                    case "%":
                    cal = new Mod();
                    break;

                    default:
                    break;
            }
            return cal;

        }
    }
}

WPF代码

/// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public static int question = 0;
        public static int right = 0;
        public static int t;
        public static string type = "";
        public static double result = 0;
        public int n = 0;//文件中的数据   
        public MainWindow()
        {
            InitializeComponent();
        }

        private void txtresult_KeyDown(object sender, KeyEventArgs e)
        {

            Calculate cal=null;string typ = typ1.Text.ToString();//调用类成员
            cal = calculate.Cal(typ);
            cal.X = Convert.ToDouble(txtone.Text);
            cal.Y= Convert.ToDouble(txttwo.Text);
            string result = Convert.ToString(cal.Result());

        if (e.Key==Key.Enter)
            {

                if (txtresult.Text == cal.result.ToString())
                {
                    
                    righttxt.Visibility = Visibility.Visible;
                    righttxt.Text += txtone.Text + typ.Text + txttwo.Text +Li.Content+ txtresult.Text + "正确√" +""+ "
";
                    MessageBox.Show("回答正确");
                    txtone.Text = "";
                    txttwo.Text = "";
                    //txtthree.Text = "";
                    txtresult.Text = "";
                    typ.Text = "";
                    
                }
                    
                else
                {
                    MessageBox.Show("回答错误");
                    
                    faulttxt.Visibility = Visibility.Visible;
                    faulttxt.Text += txtone.Text + typ.Text + txttwo.Text + Li.Content + txtresult.Text + "错误×" + "" + "
";
                    txtone.Text = "";
                    txttwo.Text = "";
                    //txtthree.Text = "";
                    txtresult.Text = "";
                    typ.Text = "";
                }
                question++;
            }
            

        }
    }
}