Code
 1    public partial class ButtonOperateTwo : UserControl
 2    {
 3        private TextBox textBoxResult = null;
 4        public ButtonOperateTwo()
 5        {
 6            InitializeComponent();
 7        }
 8        public ButtonOperateTwo(string text, TextBox textBoxResult)
 9        {
10            InitializeComponent();
11            this.buttonOperate.Text = text;
12            this.textBoxResult = textBoxResult;
13        }
14
15        private void buttonOperate_Click(object sender, EventArgs e)
16        {
17            SaveNumber1(this.textBoxResult.Text);
18            this.textBoxResult.Text = "0";
19            SaveOperate(this.buttonOperate.Text);
20        }
21
22        private void SaveNumber1(string num1)
23        {
24            Number.Number1 = this.textBoxResult.Text;
25        }
26        private void SaveOperate(string operate)
27        {
28            Number.Operate = operate;
29        }
30    }

Code
1    public struct Number
2    {
3        public static string Number1 = "0";
4        public static string Number2 = "0";
5        public static string Operate = "+";
6    }

Code
 1    public abstract class OperateBase //运算基类
 2    {
 3        public abstract string GetResult();
 4    }
 5    public abstract class OperateOne:OperateBase   //一元运算基类
 6    {
 7        public double Number1
 8        {
 9            get;
10            set;
11        }
12    }
13    public class OperateSqrt:OperateOne   //开方运算
14    {
15        public override string GetResult()
16        {
17            double result;
18            result = Math.Sqrt(Number1);
19            return result.ToString();
20        }
21    }
22    public abstract class OperateFatoryOne //一元运算工厂基类
23    {
24        protected OperateOne thisOperate = null;
25        public abstract OperateOne GetOperate();
26    }
27    public class OperateFactorySqrt : OperateFatoryOne  //开方运算工厂类
28    {
29        public override OperateOne GetOperate()
30        {
31            return new OperateSqrt();
32        }
33    }
34    private string ReturnResult()  //客户端调用方法
35        {
36            try
37            {
38                OperateFactory.OperateFatoryOne thisOperateFactory = null;
39                switch (this.button1.Text)
40                {
41                    case "+/-":
42                        thisOperateFactory = new OperateFactory.OperateFactoryReverse();
43                        break;
44                    case "sqrt":
45                        thisOperateFactory = new OperateFactory.OperateFactorySqrt();
46                        break;
47                    case "1/x":
48                        thisOperateFactory = new OperateFactory.OperateFactoryCountDown();
49                        break;
50                    case "%":
51                        thisOperateFactory = new OperateFactory.OperateFactoryPercent();
52                        break;
53                }
54                OperatingSystem.Operate.OperateOne thisOperate = thisOperateFactory.GetOperate();
55                thisOperate.Number1 = Convert.ToDouble(this.thisTextBox.Text);
56
57                string result = thisOperate.GetResult();
58                return result;
59            }
60            catch 
61            {
62                string result = "您的输入有误";
63                return result;
64            }
65                
66        }
67
68