C#计算器代码

    在刚刚接触c#的时候，就想做一个简单加减乘除计算器。这就是目标，可惜一直没有动手去做，今天特意把它简单做了。很简单，很简单，了却一个心愿了。

代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace MyPictureDownloader
{
    //http://blog.sina.com.cn/s/blog_60d576800100tf5z.html
    //http://jingyan.baidu.com/article/380abd0a6b80701d90192cde.html
    public partial class JiSuanQi : Form
    {
        public JiSuanQi()
        {
            InitializeComponent();
            initButton();
        }

        public delegate double Operater(double num1, double num2);
        public void initButton()
        {
           var p = new Point(20, 80);
           Button[] listbtn =  new Button[9];
            for (int i = 0; i < 9; i++) 
            {
                listbtn[i] = new Button();
                listbtn[i].Name = "btn" + (i + 1).ToString();
                listbtn[i].Text = (i+1).ToString();
                listbtn[i].SetBounds(p.X, p.Y, 50, 50);
                listbtn[i].Click+= new System.EventHandler(ClickHandler);
                this.Controls.Add(listbtn[i]);
                p.X += 80;
                if (p.X >= this.Width - 80)
                {
                    p.X =20;
                    p.Y += 60;
                }
            }
        }
        public void ClickHandler(Object sender, System.EventArgs e)
        {
            Button btn = (Button)sender;   
            string temp=txtnum.Text.ToString()+btn.Text;//这样解决了重复点击赋值问题
            txtnum.Text = temp;
        }

        private void btnzero_Click(object sender, EventArgs e)
        {
            string temp = txtnum.Text.ToString() + btnzero.Text;//这样解决了重复点击赋值问题
            txtnum.Text = temp;
        }

        public double jisuan(string caozuofu, Operater fanga)
        {
            double num2 = double.Parse(txtnum.Text);
            double jieguo = 0;
            //switch(caozuofu){
            //    case"+":
            //        jieguo = fanga(tempnum, num2);
            //        break;
            //    case "-":
            //        jieguo = fanga(tempnum, num2);
            //        break;
            //    case "*":
            //        jieguo = fanga(tempnum, num2);
            //        break;
            //    case "/":
            //        jieguo = fanga(tempnum, num2);
            //        break;
            //}
            jieguo = fanga(tempnum, num2);
            return jieguo;
        }

        public double add(double num1, double num2) 
        {
            return num1 + num2;
        }

        public double jian(double num1, double num2)
        {
            return num1- num2;
        }

        public double cheng(double num1, double num2)
        {
            return num1 * num2;
        }

        public double chu(double num1, double num2)
        {
            double result = 0;
            if (num2!=0)
            {
            result= num1 / num2;
            }
            return result;
        }
        public double tempnum = 0;
        public string caozuofu = "";
        public event Operater fangfa;
        private void btnresult_Click(object sender, EventArgs e)
        {
            txtnum.Text = jisuan(caozuofu, fangfa).ToString();
        }

        private void btnadd_Click(object sender, EventArgs e)
        {
            tempnum = double.Parse(txtnum.Text);
            caozuofu = btnadd.Text;
            txtnum.Text = "";
            fangfa = add;
        }

        private void btnde_Click(object sender, EventArgs e)
        {
            tempnum = double.Parse(txtnum.Text);
            caozuofu = btnde.Text;
            txtnum.Text = "";
            fangfa = jian;
        }

        private void btncheng_Click(object sender, EventArgs e)
        {
            tempnum = double.Parse(txtnum.Text);
            caozuofu = btncheng.Text;
            txtnum.Text = "";
            fangfa = cheng;
        }

        private void btnchu_Click(object sender, EventArgs e)
        {
            tempnum = double.Parse(txtnum.Text);
            caozuofu = btnchu.Text;
            txtnum.Text = "";
            fangfa = chu;
        }

        private void btndian_Click(object sender, EventArgs e)
        {
            if (txtnum.Text.ToString()=="") 
            {
                txtnum.Text = "0";
            }
            string temp="";
            if (txtnum.Text.ToString().IndexOf(".") > 0)//解决只能包含一个小数点
            {
                temp = txtnum.Text.ToString();
            }
            else 
            {
                temp = txtnum.Text.ToString() + btndian.Text;//这样解决了重复点击赋值问题
            }
            txtnum.Text = temp;
        }
    }
}

初始界面：

运行后的界面：

 

几个数字按钮是动态生成的，这就是我想要做的计算器。