用ASP.NET实现计算器功能

WebApplication

版本的计算器的实现

用户界面的代码如下（

WebForm1.aspx

）

:

<%@Pagelanguage=”c#”Codebehind=”WebForm1.aspx.cs”AutoEventWireup=”false”Inherits=”WebApplicationcalc.WebForm1″ %>

<!DOCTYPE HTML PUBLIC “-//W

3C
//DTD HTML 4.0 Transitional//EN” >

<HTML>

<HEAD>

<title>WebForm1</title>

</HEAD>

<table style=”WIDTH: 280px; HEIGHT: 168px” borderColor=”buttonshadow” width=”280″ align=”center”

bgColor=”activeborder” border=”1″>

<asp:label id=”Label1″ runat=”server” BackColor=”ActiveCaption” Width=”264px”>WebApplication

版本的计算器

</asp:label></td></tr><tr>

<asp:textbox id=”txtShow” runat=”server” BackColor=”Control” Width=”264px” BorderColor=”Lime”

ReadOnly=”True”></asp:textbox></td></tr><tr>

<asp:button id=”btn_7″ runat=”server” Width=”40px” Text=”7″></asp:button></td>

<asp:button id=”btn_8″ runat=”server” Width=”40px” Text=”8″></asp:button></TD>

<asp:button id=”btn_9″ runat=”server” Width=”48px” Text=”9″></asp:button></TD>

<asp:button id=”btn_sprt” runat=”server” Width=”36px” Text=”sprt”></asp:button></td></tr><tr>

<asp:button id=”btn_4″ runat=”server” Width=”40px” Text=”4″></asp:button></td>

<td> 

<asp:button id=”btn_5″ runat=”server” Width=”40px” Text=”5″></asp:button></td>

<asp:button id=”btn_6″ runat=”server” Width=”48px” Text=”6″></asp:button></td>

<td> 

<asp:button id=”btn_mul” runat=”server” Width=”39px” Text=”*”></asp:button></td>

<td> 

<asp:button id=”btn_spr” runat=”server” Width=”32px” Text=”spr”></asp:button></td>

</tr>

<tr>

<asp:button id=”btn_1″ runat=”server” Width=”40px” Text=”1″></asp:button></td>

<td> 

<asp:button id=”btn_2″ runat=”server” Width=”42px” Text=”2″></asp:button></td>

<asp:button id=”btn_3″ runat=”server” Width=”44px” Text=”3″></asp:button></td>

<td> 

<asp:button id=”btn_add” runat=”server” Width=”40px” Text=”+”></asp:button></td>

<td> 

<asp:button id=”btn_rev” runat=”server” Width=”32px” Text=”1/x”></asp:button></td></tr><tr>

<asp:button id=”btn_0″ runat=”server” Width=”40px” Text=”0″></asp:button></td>

<td> 

<asp:button id=”btn_sign” runat=”server” Width=”41px” Text=”+/-“></asp:button></td>

<asp:button id=”btn_dot” runat=”server” Width=”46px” Text=”.”></asp:button></td>

<td> 

<asp:button id=”btn_sub” runat=”server” Width=”40px” Text=”-“></asp:button></td>

<td> 

<asp:buttonid=”btn_equ”runat=”server”Width=”32px” Text=”=”></asp:button></td></tr></table></form>

</body>

</HTML>

！

2

．全局变量的定义

在程序设计中我们需要定义

res(

记录结果数

)

、

tmp(

当前输入的操作数

)

、

opt

（记录操作数的个数）、

dot

（记录是否单击了小数点）、

num

（记录输入的操作数的个数）、

dotnum

（记录小数点部分的个数）这六个全局变量，在程序中运行过程中传递和保存数据。我最初的想到的解决方案是为程序设计一个

Calcuater.cs

类

,

并在类中添加六个字段引用，然后设置成类的六个属性，以实例化引用类属性的方式在各函数之间进行值传递。从理论上讲这样的事件是可行的，但是正是由于

Windows

应用程序与

Web

应用程序存在运行机制上的差异，导致该解决方案在此行不通。这种设计的运行结果是每次单击一次按钮触发一个事件时，在计算器中只能显示该按钮传递的单个值，而不会累计上次触发事件传递的值，更谈不上计算了。

Global.asax.cs

的程序清单：

using System;

using System.Collections;

using System.ComponentModel;

using System.Web;

using System.Web.SessionState;

namespace WebApplicationcalc

{

/// <summary>

/// Global

的摘要说明。

/// </summary>

public class Global : System.Web.HttpApplication

{

/// <summary>

///

必需的设计器变量。

/// </summary>

private System.ComponentModel.IContainer components = null;

public Global()

{

InitializeComponent();

}

protected void Application_Start(Object sender, EventArgs e)

{

}

protected void Session_Start(Object sender, EventArgs e)

{

//

启动用户会话机制，为计算器保存数据

Session[“res”]=0; //

记录结果数

Session[“tmp”]=0;//

当前输入的操作数

Session[“opt”]=0; //

记录操作码

Session[“dot”]=0;//

记录是否单击了小数点

Session[“num”]=0;//

记录操作输入的个数

Session[“dotnum”]=0;

//

记录小数点部分的个数

}

protected void Application_BeginRequest(Object sender, EventArgs e)

{

}

protected void Application_EndRequest(Object sender, EventArgs e)

{

}

protected void Application_AuthenticateRequest(Object sender, EventArgs e)

{

}

protected void Application_Error(Object sender, EventArgs e)

{

}

protected void Session_End(Object sender, EventArgs e)

{

}

protected void Application_End(Object sender, EventArgs e)

{

}

#region Web

窗体设计器生成的代码

/// <summary>

///

设计器支持所需的方法

–

不要使用代码编辑器修改

///

此方法的内容。

/// </summary>

private void InitializeComponent()

{

this.components = new System.ComponentModel.Container();

}

#endregion

}

3．

用程序的设计

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

namespace WebApplicationcalc

                    /// <summary>

                    /// WebForm1 的摘要说明。

                    /// </summary>

                    public class WebForm1 : System.Web.UI.Page

                                         protected System.Web.UI.WebControls.Label Label1;

                                         protected System.Web.UI.WebControls.TextBox txtShow;

                                         protected System.Web.UI.WebControls.Button btn_7;

                                         protected System.Web.UI.WebControls.Button btn_8;

                                         protected System.Web.UI.WebControls.Button btn_9;

                                         protected System.Web.UI.WebControls.Button btn_div;

                                         protected System.Web.UI.WebControls.Button btn_sprt;

                                         protected System.Web.UI.WebControls.Button btn_4;

                                         protected System.Web.UI.WebControls.Button btn_5;

                                         protected System.Web.UI.WebControls.Button btn_6;

                                         protected System.Web.UI.WebControls.Button btn_mul;

                                         protected System.Web.UI.WebControls.Button btn_spr;

                                         protected System.Web.UI.WebControls.Button btn_1;

                                         protected System.Web.UI.WebControls.Button btn_2;

                                         protected System.Web.UI.WebControls.Button btn_3;

                                         protected System.Web.UI.WebControls.Button btn_add;

                                         protected System.Web.UI.WebControls.Button btn_rev;

                                         protected System.Web.UI.WebControls.Button btn_0;

                                         protected System.Web.UI.WebControls.Button btn_sign;

                                         protected System.Web.UI.WebControls.Button btn_dot;

                                         protected System.Web.UI.WebControls.Button btn_sub;

                                         protected System.Web.UI.WebControls.Button btn_equ;

                                         public const int NULL = 0;                  // 定义操作码

                                         public const int ADD = 1;

                                         public const int SUB = 2;

                                         public const int MUL = 3;

                                         public const int DIV = 4;

                                         public const int SQR = 5;

                                         public const int SQRT = 6;

                                         public const int NODOT  = 0;           // 定义是否点击了小数点

                                         public const int HASDOT = 1;

                                         private void Page_Load(object sender, System.EventArgs e)

                                                             // 在此处放置用户代码以初始化页面

                                         #region Web 窗体设计器生成的代码

                                         override protected void OnInit(EventArgs e)

//

                                                             // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。

//

                                                             InitializeComponent();

                                                             base.OnInit(e);

                                         /// <summary>

                                         /// 设计器支持所需的方法 - 不要使用代码编辑器修改

                                         /// 此方法的内容。

                                         /// </summary>

                                         private void InitializeComponent()

//利用C＃中的事件代理机制对对象进行事件绑定

//其中0～9按钮的Click事件都有btn_0_Click（）进行处理

                                                             this.btn_7.Click += new System.EventHandler(this.btn_0_Click);

                                                             this.btn_8.Click += new System.EventHandler(this.btn_0_Click);

                                                             this.btn_9.Click += new System.EventHandler(this.btn_0_Click);

                                                             this.btn_div.Click += new System.EventHandler(this.btn_div_Click);

                                                             this.btn_sprt.Click += new System.EventHandler(this.btn_sprt_Click);

                                                             this.btn_4.Click += new System.EventHandler(this.btn_0_Click);

                                                             this.btn_5.Click += new System.EventHandler(this.btn_0_Click);

                                                             this.btn_6.Click += new System.EventHandler(this.btn_0_Click);

                                                             this.btn_mul.Click += new System.EventHandler(this.btn_mul_Click);

                                                             this.btn_spr.Click += new System.EventHandler(this.btn_spr_Click);

                                                             this.btn_1.Click += new System.EventHandler(this.btn_0_Click);

                                                             this.btn_2.Click += new System.EventHandler(this.btn_0_Click);

                                                             this.btn_3.Click += new System.EventHandler(this.btn_0_Click);

                                                             this.btn_add.Click += new System.EventHandler(this.btn_add_Click);

                                                             this.btn_rev.Click += new System.EventHandler(this.btn_rev_Click);

                                                             this.btn_0.Click += new System.EventHandler(this.btn_0_Click);

                                                             this.btn_sign.Click += new System.EventHandler(this.btn_sign_Click);

                                                             this.btn_dot.Click += new System.EventHandler(this.btn_dot_Click);

                                                             this.btn_sub.Click += new System.EventHandler(this.btn_sub_Click);

                                                             this.btn_equ.Click += new System.EventHandler(this.btn_equ_Click);

                                                             this.Load += new System.EventHandler(this.Page_Load);

                                         #endregion

                                         private void btn_0_Click(object sender, System.EventArgs e)

//当点击一个数字按钮的时候，需要进行判断，如果没有点击

                    //小数点，那么就把原来的数值扩大10倍后再加上当前的数值，

                    // 如果点击了小数点，那么就将当前的数值除以一个权数，再

                    // 加上原来的数值，得到新的数值。

                                                           System.Web.UI.WebControls.Button btnTmp;

                                                             double i=0;

                                                             btnTmp=sender as System.Web.UI.WebControls.Button;

                                                             if(btnTmp!=null)

//没有单击小数点

                                                                   if(Int32.Parse(Session["dot"].ToString())==NODOT)

                                                                                 i=double.Parse(btnTmp.Text.ToString());

                                                                                 Session["tmp"]=double.Parse(Session["tmp"].ToString())*10+i;

                                                                                 txtShow.Text=Session["tmp"].ToString();

                                                             else

                                  //单击了小数点

                                                                     Session["dotnum"]=Int32.Parse(Session["dotnum"].ToString())+1;

                                                                   i=double.Parse(btnTmp.Text.ToString())/System.Math.Pow(10,Int32.Parse(Session["dotnum"].ToString()));

                                                                                 Session["tmp"]=double.Parse(Session["tmp"].ToString())+i;

                                                                                 txtShow.Text=Session["tmp"].ToString();

                                         private void btn_equ_Click(object sender, System.EventArgs e)

                                                             if(Int32.Parse(Session["num"].ToString())==0)

                                                                                 Session["res"]=0;

                                                                                 Session["tmp"]=0;

                                         txtShow.Text=Session["tmp"].ToString();

                                                                                 return;

                            //对Session对象进行转化减少代码编写量

                                                             double res=double.Parse(Session["res"].ToString());

                                                             double tmp=double.Parse(Session["tmp"].ToString());

                                                             int opt=Int32.Parse(Session["opt"].ToString());

                                                             switch (opt)

                                                                                                      // 加法

                                                                                 case ADD:

                                                                                                      res = res + tmp;

                                                                                                      break;

                                                                                                      // 减法

                                                                                 case SUB:

                                                                                                      res = res - tmp;

                                                                                                      break;

                                                                                                      // 乘法

                                                                                 case MUL:

                                                                                                      res = res * tmp;

                                                                                                      break;

                                                                                                      // 除法

                                                                                 case DIV:

                                                                                                      res = res / tmp;

                                                                                                      break;

                                                                                                      // 平方

                                                                                 case SQR:

                                                                                                      res = tmp * tmp;

                                                                                                      break;

                                                                                                      // 平方根

                                                                                 case SQRT:

                                                                                                      res = System.Math.Sqrt(tmp);

                                                                                                      break;

                                                                                 default:

                                                                                                      return;

                                                             txtShow.Text = res.ToString();

                              Session["opt"]=NULL;

                              Session["res"]=0;

                                                             Session["num"]=0;

                                         private void btn_div_Click(object sender, System.EventArgs e)

                              //除法运算

                                                             Session["opt"]=DIV;

                                                             if(Int32.Parse(Session["num"].ToString())!=0)

                                                                                 if(double.Parse(Session["tmp"].ToString())!=0)

                Session["res"]=double.Parse(Session["res"].ToString())/double.Parse(Session["tmp"].ToString());

                                                             else

                                  Session["res"]=Session["tmp"];

                                       Session["num"]=Int32.Parse(Session["num"].ToString())+1;

                              Session["tmp"]=0;

                                                             txtShow.Text = Session["res"].ToString();

                                         private void btn_mul_Click(object sender, System.EventArgs e)

                             //乘法运算

                                                             Session["opt"]=MUL;

                                                             if(Int32.Parse(Session["num"].ToString())!=0)

                 Session["res"]=double.Parse(Session["res"].ToString())*double.Parse(Session["tmp"].ToString());

                                         else

                              Session["res"]=Session["tmp"];

                              Session["num"]=Int32.Parse(Session["num"].ToString())+1;

                                                             Session["tmp"]=0;

                                                             txtShow.Text = Session["res"].ToString();

                                         private void btn_sub_Click(object sender, System.EventArgs e)

                               //减法运算

                                                   Session["opt"]=SUB;

                                                             if(Int32.Parse(Session["num"].ToString())!=0)

                                                                                 Session["res"]=double.Parse(Session["res"].ToString())-double.Parse(Session["tmp"].ToString());

                                                             else

                                                             Session["res"]=Session["tmp"];

                                                             Session["num"]=Int32.Parse(Session["num"].ToString())+1;

                                                             Session["tmp"]=0;

                                                             txtShow.Text = Session["res"].ToString();

                                         private void btn_add_Click(object sender, System.EventArgs e)

                              //加法运算

                                                             Session["opt"]=ADD;

                                                             if(Int32.Parse(Session["num"].ToString())!=0)

                                                                                 Session["res"]=double.Parse(Session["res"].ToString())+double.Parse(Session["tmp"].ToString());

                                                             else

                                                                        Session["res"]=Session["tmp"];

                                                                      Session["num"]=Int32.Parse(Session["num"].ToString())+1;

                                                                      Session["tmp"]=0;

                                                                      txtShow.Text = Session["res"].ToString();

                                         private void btn_sprt_Click(object sender, System.EventArgs e)

                              //开方运算

                                                             if(Int32.Parse(Session["num"].ToString())>0)

                                                                  Session["tmp"]=Math.Sqrt(double.Parse(Session["tmp"].ToString()));

                                 txtShow.Text = Session["tmp"].ToString();

                                         private void btn_spr_Click(object sender, System.EventArgs e)

                          //平方运算

                    Session["tmp"]=double.Parse(Session["tmp"].ToString())*double.Parse(Session["tmp"].ToString());

                        txtShow.Text = Session["tmp"].ToString();

                                         private void btn_rev_Click(object sender, System.EventArgs e)

//倒数运算

                                                  Session["tmp"]=1/double.Parse(Session["tmp"].ToString());

                         txtShow.Text = Session["tmp"].ToString();

                                         private void btn_dot_Click(object sender, System.EventArgs e)

                          //单击了小数点

                                                             Session["dot"]=HASDOT;

                                                             Session["dotnum"]=0;

                                         private void btn_sign_Click(object sender, System.EventArgs e)

                                                  //单击了符号运算 Session["tmp"]=double.Parse(Session["tmp"].ToString())-double.Parse(Session["tmp"].ToString());

                                                              txtShow.Text = Session["tmp"].ToString();

OK

！

原文链接：https://blog.csdn.net/takeie/article/details/1528967

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