提示：以下是本篇文章正文内容，下面案例可供参考
一、操作符的抽象方法（Operation ）
定义一个抽象类Operation 作为所有操作符(+、-、*、/)的父类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace demo02
{
public abstract class Operation
{
private double num1;
private double num2;
public double Num1
{
get {
return num1; }
set {
num1 = value; }
}
public double Num2
{
get {
return num2; }
set {
num2 = value; }
}
public abstract double getResult(); // 需要重写的方法
}
}
二、创建所有的操作符子类
1.加法类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace demo02
{
public class Add:Operation
{
override
public double getResult()
{
double result = Num1+ Num2;
return result;
}
}
}
2.减法类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace demo02
{
public class Sub: Operation
{
override
public double getResult()
{
double result = Num1 - Num2;
return result;
}
}
}
3.乘法类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace demo02
{
public class Mul: Operation
{
override
public double getResult()
{
double result = Num1 * Num2;
return result;
}
}
}
4.除法类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace demo02
{
public class Div:Operation
{
override
public double getResult()
{
if (Num2 != 0)
{
double result = Num1 / Num2;
return result;
}
else
{
return 0;
}
}
}
}
三、创建工厂函数
通过工厂函数 new 一个操作符对象，得到结果数
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace demo02
{
public class OperationFactory
{
public static Operation getOperation(String oper) //接收传入的操作符
{
switch (oper)
{
case "+": return new Add();
case "-": return new Sub();
case "*": return new Mul();
case "/": return new Div();
default:return null;
}
}
}
}
四、页面效果
这里我是用的web页面进行显示输出的
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="index.aspx.cs" Inherits="demo02.index" %>
<!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 {
height: 24px;
width: 932px;
}
.auto-style2 {
height: 24px;
width: 191px;
}
.auto-style3 {
width: 191px;
}
.auto-style4 {
height: 24px;
width: 70px;
}
.auto-style5 {
width: 70px;
}
.auto-style6 {
width: 932px;
}
.auto-style7 {
width: 100%;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<table class="auto-style7">
<tr>
<td class="auto-style2">
<asp:TextBox ID="num1" runat="server" type="number" ></asp:TextBox>
</td>
<td class="auto-style4">
<asp:DropDownList ID="opers" runat="server">
<asp:ListItem>+</asp:ListItem>
<asp:ListItem>-</asp:ListItem>
<asp:ListItem>*</asp:ListItem>
<asp:ListItem>/</asp:ListItem>
</asp:DropDownList>
</td>
<td class="auto-style1">
<asp:TextBox ID="num2" type="number" runat="server"></asp:TextBox>
=
<asp:Label ID="result" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td class="auto-style3"> </td>
<td class="auto-style5"> </td>
<td class="auto-style6"> </td>
</tr>
<tr>
<td class="auto-style3"> </td>
<td class="auto-style5"> </td>
<td class="auto-style6">
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="计算" />
</td>
</tr>
</table>
</div>
</form>
</body>
</html>