web中用c#设计一个简易计算器

设计并实现一个简易的计算器—使用页面上提供的基本数码（0-9）按键在两个文本框TextBox1、TextBox2中输入两个数然后按下算符按键（加法运算符按键btnADD、减法运算符按键btnSubtractor、乘法算符按键btnMultiplying、除法算符按键btnDivision），能做相应的的某个单种类运算，在显示结果的只读文本框TextBox3上能显示相应的运算的结果。

具体的操作步骤如下：
（1）、选择“网站|添加新项”命令，添加一个Web窗体页。
（2）、设计如下所示的界面，两个文本框TextBox1、TextBox2中输入两个数，以及Button按钮。具体的设计界面如下。

（3）、纯白文本框的enabled的属性在程序运行中被设置为true,灰色文本框的enabled的属性在程序运行中被设置为false；0~9按键的Click事件处理方法（也叫函数）可用同一方法button_Click其第一形参sender将携带被单击的数字按键的对象信息，只要注意到被单击的数字按键对象是由button类产生的，而button_Click其第一形参sender的数据类型是object, 在方法体内对形参sender做强制类型转换，使得强制转换为button类的对象，之后就可以获得button界面上的数码信息。（但在此例中我的办法比较蠢，我将10个Button全都进行插入编写了代码）
具体的代码为：

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;public partial class _Default : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {    }    double op1, op2, result = 0;//定义三个操作数    char op;//运算符    protected void Button_Click(object sender, EventArgs e)    {        Button btn = (Button)sender;        if (TextBox1.Enabled)            TextBox1.Text += btn.Text;        else if (TextBox2.Enabled)            TextBox2.Text += btn.Text;    }    protected void Button2_Click(object sender, EventArgs e)    {        Button btn = (Button)sender;        if (TextBox1.Enabled)            TextBox1.Text += btn.Text;        else if (TextBox2.Enabled)            TextBox2.Text += btn.Text;    }    protected void Button4_Click(object sender, EventArgs e)    {        Label1.Text = "+";        TextBox1.Enabled = false;    }    protected void Button8_Click(object sender, EventArgs e)    {        Label1.Text = "-";        TextBox1.Enabled = false;    }    protected void Button12_Click(object sender, EventArgs e)    {        Label1.Text = "*";        TextBox1.Enabled = false;    }    protected void Button16_Click(object sender, EventArgs e)    {        Label1.Text = "/";        TextBox1.Enabled = false;    }    protected void Button15_Click(object sender, EventArgs e)    {        Label2.Text = "=";        TextBox2.Enabled = false;        op1 = double.Parse(TextBox1.Text);        op2 = double.Parse(TextBox2.Text);        op = Convert.ToChar(Label1.Text);        switch(op)//操作符的几个形式        {            case '+':                result = op1 + op2;                TextBox3.Text = result.ToString();                break;            case '-':                result = op1 - op2;                TextBox3.Text = result.ToString();                break;            case '*':                result = op1 * op2;                TextBox3.Text = result.ToString();                break;            case '/':                result = op1 / op2;                TextBox3.Text = result.ToString();                break;            default:                break;        }        }    protected void Button17_Click(object sender, EventArgs e)    {        TextBox1.Text = "";        TextBox1.Enabled = true;    }   protected void Button18_Click(object sender, EventArgs e)    {        TextBox2.Text = "";        TextBox2.Enabled = true;    }   protected void Button19_Click(object sender, EventArgs e)   {       Label1.Text = "";       Label2.Text = "";       TextBox1.Enabled = true;       TextBox2.Enabled = true;       TextBox1.Text = "";       TextBox2.Text = "";       TextBox3.Text = "";   }   protected void TextBox1_TextChanged(object sender, EventArgs e)   {   }   protected void TextBox2_TextChanged(object sender, EventArgs e)   {   }   protected void Button3_Click(object sender, EventArgs e)   {       Button btn = (Button)sender;       if (TextBox1.Enabled)           TextBox1.Text += btn.Text;       else if (TextBox2.Enabled)           TextBox2.Text += btn.Text;   }   protected void Button5_Click(object sender, EventArgs e)   {       Button btn = (Button)sender;       if (TextBox1.Enabled)           TextBox1.Text += btn.Text;       else if (TextBox2.Enabled)           TextBox2.Text += btn.Text;   }   protected void Button6_Click(object sender, EventArgs e)   {       Button btn = (Button)sender;       if (TextBox1.Enabled)           TextBox1.Text += btn.Text;       else if (TextBox2.Enabled)           TextBox2.Text += btn.Text;   }   protected void Button7_Click(object sender, EventArgs e)   {       Button btn = (Button)sender;       if (TextBox1.Enabled)           TextBox1.Text += btn.Text;       else if (TextBox2.Enabled)           TextBox2.Text += btn.Text;   }   protected void Button9_Click(object sender, EventArgs e)   {       Button btn = (Button)sender;       if (TextBox1.Enabled)           TextBox1.Text += btn.Text;       else if (TextBox2.Enabled)           TextBox2.Text += btn.Text;   }   protected void Button10_Click(object sender, EventArgs e)   {       Button btn = (Button)sender;       if (TextBox1.Enabled)           TextBox1.Text += btn.Text;       else if (TextBox2.Enabled)           TextBox2.Text += btn.Text;   }   protected void Button11_Click(object sender, EventArgs e)   {       Button btn = (Button)sender;       if (TextBox1.Enabled)           TextBox1.Text += btn.Text;       else if (TextBox2.Enabled)           TextBox2.Text += btn.Text;   }   protected void Button13_Click(object sender, EventArgs e)   {       Button btn = (Button)sender;       if (TextBox1.Enabled)           TextBox1.Text += btn.Text;       else if (TextBox2.Enabled)           TextBox2.Text += btn.Text;   }}

设计部分的源代码为：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>    <title></title>    <style type="text/css">        .auto-style1 {            font-weight: bold;        }        .auto-style2 {            background-color: #6666FF;        }        .auto-style3 {            font-weight: bold;            background-color: #6600FF;        }    </style></head><body style="color: #FFCCFF; margin-bottom: 19px">    <form id="form1" runat="server">    <div>        <asp:TextBox ID="TextBox1" runat="server" Width="87px" OnTextChanged="TextBox1_TextChanged" CssClass="auto-style1"></asp:TextBox>        <b>        <asp:Label ID="Label1" runat="server" Text="Label" CssClass="auto-style2"></asp:Label>&nbsp;        </b>        <asp:TextBox ID="TextBox2" runat="server" Width="109px" OnTextChanged="TextBox2_TextChanged" CssClass="auto-style1"></asp:TextBox>        <asp:Label ID="Label2" runat="server" Text="Label" CssClass="auto-style3"></asp:Label>        <asp:TextBox ID="TextBox3" runat="server" Width="126px" style="margin-left: 5px" CssClass="auto-style1"></asp:TextBox>        <b>        <br />        </b>        <asp:Button ID="Button1" runat="server" Text="1" OnClick="Button_Click" CssClass="auto-style1" />        <b>&nbsp;&nbsp;&nbsp; </b> <asp:Button ID="Button2" runat="server" Text="2" OnClick="Button2_Click" CssClass="auto-style1" />        <b>&nbsp;&nbsp; </b> <asp:Button ID="Button3" runat="server" Text="3" CssClass="auto-style1" OnClick="Button3_Click" />        <b>&nbsp;&nbsp; </b> <asp:Button ID="Button4" runat="server" Text="+" OnClick="Button4_Click" CssClass="auto-style1" />        <b>        <br />        <br />        </b>        <asp:Button ID="Button5" runat="server" Text="4" CssClass="auto-style1" OnClick="Button5_Click" style="width: 23px" />        <b>&nbsp;&nbsp;&nbsp; </b> <asp:Button ID="Button6" runat="server" Text="5" CssClass="auto-style1" OnClick="Button6_Click" />        <b>&nbsp;&nbsp; </b> <asp:Button ID="Button7" runat="server" Text="6" CssClass="auto-style1" OnClick="Button7_Click" />        <b>&nbsp;&nbsp; </b> <asp:Button ID="Button8" runat="server" Text="-" OnClick="Button8_Click" CssClass="auto-style1" />        <b>        <br />        <br />        </b>        <asp:Button ID="Button9" runat="server" Text="7" CssClass="auto-style1" OnClick="Button9_Click" />        <b>&nbsp;&nbsp;&nbsp; </b> <asp:Button ID="Button10" runat="server" Text="8" CssClass="auto-style1" OnClick="Button10_Click" style="height: 27px" />        <b>&nbsp;&nbsp; </b> <asp:Button ID="Button11" runat="server" Text="9" CssClass="auto-style1" OnClick="Button11_Click" />        <b>&nbsp;&nbsp; </b> <asp:Button ID="Button12" runat="server" Text="*" OnClick="Button12_Click" CssClass="auto-style1" />        <b>        <br />        <br />        </b>        <asp:Button ID="Button13" runat="server" Text="0" CssClass="auto-style1" OnClick="Button13_Click" />        <b>&nbsp;&nbsp;&nbsp; </b> <asp:Button ID="Button14" runat="server" Text="." CssClass="auto-style1" />        <b>&nbsp;&nbsp; </b> <asp:Button ID="Button15" runat="server" Text="=" OnClick="Button15_Click" CssClass="auto-style1" />        <b>&nbsp;&nbsp;        </b>        <asp:Button ID="Button16" runat="server" Text="/" OnClick="Button16_Click" CssClass="auto-style1" />        <b>        <br />        <br />        </b>        <asp:Button ID="Button17" runat="server" Text="cls op1" OnClick="Button17_Click" CssClass="auto-style1" />        <b>&nbsp;&nbsp;        </b>        <asp:Button ID="Button18" runat="server" Text="cls op2" OnClick="Button18_Click" CssClass="auto-style1" />        <b>&nbsp;&nbsp;        </b>        <asp:Button ID="Button19" runat="server" Text="clear All" OnClick="Button19_Click" CssClass="auto-style1" />        <b>        <br />        </b>    </div>    </form></body></html>

（4）、具体的运行界面为：（有点丑）

本人是个Web初学者，希望大家给予多多发表自己的意见。