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。