设计模式学习之工厂模式2

 刚刚学习了设计模式的简单工厂模式,现在又学了工厂模式,把工厂模式的代码写下来!

 还是一样先建一个运算类,比简单工厂不同的是,我们在这里再建一个工厂接口,这个接口里面定义了一个方法,返回一个Operation运算类,

 /// <summary>
    /// 运算类
    /// </summary>
   public  class Operation
    {
        private double numbera;//第一个运算数

        public double Numbera 
        {
            get { return numbera; }
            set { numbera = value; }
        }
        private double Numberb;//第二个运算数

        public double Numberb1 
        {
            get { return Numberb; }
            set { Numberb = value; }
        }
        public virtual double GetResult() //运算方法,空,在子类中会重写这个方法
        {
            
            double  result = 0;
            return result;
        }
      

    }
   /// <summary>
   /// 工厂接口
   /// </summary>
  public  interface Ifactory
   {
       Operation Createoperation();
   }

然后再建4个运算类,如下,这里就一起建了

 1  /// <summary>
 2     /// 加法运算类
 3     /// </summary>
 4     class jiafayunsan:Operation 
 5     {
 6         public override double GetResult() //重写父类中的运算方法
 7         {
 8             double result = 0;
 9             result = base.Numbera + base.Numberb1; //用父类中的这个参数相加
10             return result;
11         }
12     }
13 
14 /// <summary>
15     /// 减法类
16     /// </summary>
17     class Operationsub:Operation 

18     {
19         public override double GetResult()//重写父类中的运算方法
20         {
21             double result = 0;
22             result = base.Numbera - base.Numberb1;//用父类中的这个参数相减
23             return result;
24         }
25     }
26 
27 /// <summary>
28     /// 成法类
29     /// </summary>
30     class OperationMul:Operation 
31     {
32         public override double GetResult()//重写父类中的运算方法
33         {
34             double retult = 0;
35             retult = base.Numbera * base.Numberb1;//用父类中的这个参数相成
36             return retult;
37         }
38     }
39 
40 /// <summary>
41     /// 除法类
42     /// </summary>
43     class OperationDiv:Operation 
44     {
45         
46         
47         public override double GetResult()//重写父类中的运算方法
48         {
49             double result = 0;
50             if (base.Numbera > 0)
51             {
52                 result = base.Numbera / Numberb1;//用父类中的这个参数相除
53             }
54             return result;
55         }
56     }

我把这4个运算写在一起了,为了方便观看,然后我们再建4个工厂类,这4个工厂类都对应上面4个运算类,而且每个工厂类都要继承工厂接口Ifactory,代码如下:

 1  /// <summary>
 2     /// 除法类工厂
 3     /// </summary>
 4    public  class Divfactory:Ifactory  
 5     {
 6         #region Ifactory 成员
 7 
 8         public Operation Createoperation()
 9         {
10             return new OperationDiv();
11         }
12 
13         #endregion
14     }
15 
16  /// <summary>
17     /// 减法类工厂
18     /// </summary>
19    public  class SubFactory:Ifactory 
20     {
21 
22 
23         #region Ifactory 成员
24 
25         public Operation Createoperation()
26         {
27             return new Operationsub();
28         }
29 
30         #endregion
31     }
32  /// <summary>
33     /// 成法类工厂
34     /// </summary>
35    public  class Mulfactory:Ifactory 
36     {
37 
38         #region Ifactory 成员
39 
40         public Operation Createoperation()
41         {
42             return new OperationMul();
43         }
44 
45         #endregion
46     }
47  /// <summary>
48     /// 除法类工厂
49     /// </summary>
50    public  class Divfactory:Ifactory  
51     {
52         #region Ifactory 成员
53 
54         public Operation Createoperation()
55         {
56             return new OperationDiv();
57         }
58 
59         #endregion
60     }

前台计算的页面还是一样,也是用ajax的方式提交

 1 <head runat="server">
 2     <title></title>
 3     <script src="Scripts/jquery-1.4.1-vsdoc.js" type="text/javascript"></script>
 4     <script type="text/javascript">
 5         $(function () {
 6 
 7             $("#buttons").click(function () {
 8 
 9                 var number1 = document.getElementById("number1").value;//第一个运算数
10                 var number2 = document.getElementById("number2").value;//第二个运算数
11                 var yunsanfu = document.getElementById("Select1").value;//运算符
12 
13                 //用Jquery.post方法提交
14                 $.post("Handler1.ashx", { numbera: number1, numberb: number2, yunsanfus: yunsanfu }, function (date) {
15                     document.getElementById("count").value = date;
16 
17 
18                 })
19             })
20 
21         })
22     </script>
23 </head>
24 <body>
25    <form id="form1" runat="server">
26     <div>
27         <input id="number1" type="text" name="name" value="" />
28         <select id="Select1">
29             <option value="+">+</option>
30              <option value="-">-</option>
31               <option value="*">*</option>
32                <option value="/">/</option>
33         </select>
34         <input id="number2" type="text" name="name" value="" />
35         <input id="buttons" type="button" value="=" />
36         <input id="count" type="text" name="name"  />
37     </div>
38     <div>
39       
40     </div>
41    </form>
42 </body>
43 </html>

后台代码如下:

 1  /// <summary>
 2     /// Handler1 的摘要说明
 3     /// </summary>
 4     public class Handler1 : IHttpHandler
 5     {
 6 
 7         public void ProcessRequest(HttpContext context)
 8         {
 9             context.Response.ContentType = "text/plain";
10 
11             
12             string numbera = context.Request.Form["numbera"];//第一个数字
13 
14             string numberb = context.Request.Form["numberb"];//第二个数字
15             string numberc = context.Request.Form["yunsanfus"]; //运算符
16              Operation oper=null;
17              Ifactory operfactory;
18             if (numberc == "+")
19             {
20                operfactory = new Addfactory();  //实列加法工厂
21                 oper = operfactory.Createoperation();
22             
23             }
24             else if (numberc == "-")
25             {
26                 operfactory =new SubFactory (); //实列减法工厂
27                 oper = operfactory.Createoperation();
28             }
29             else if (numberc == "*")
30             {
31                 operfactory = new Mulfactory();//实列成法工厂
32                 oper = operfactory.Createoperation();
33             }
34             else if (numberc == "/")
35             {
36                 operfactory = new Divfactory();//实列除法工厂
37                 oper = operfactory.Createoperation();
38             }
39 
40             oper.Numbera = Convert.ToDouble(numbera);
41             oper.Numberb1 = Convert.ToDouble(numberb);
42 
43             double result = oper.GetResult();
44             context.Response.Write(result);
45 
46             //Operation oper;
47             //oper = JianDanGongchang.createoperate(numberc);//调用简单运算工厂类,传一个运算符,工厂类会帮你自己计算:
48 
49             //oper.Numbera = Convert .ToDouble(numbera); //把一个参数传进来
50             //oper.Numberb1 = Convert .ToDouble(numberb);//把第二个参数传进来
51 
52             //double result = oper.GetResult(); //调用运算方法
53 
54             //context.Response.Write(result); //返回运算回来的结果,回传给WebForm1.aspx页面。
55         }
56         
57         public bool IsReusable
58         {
59             get
60             {
61                 return false;
62             }
63         }
64     }

 工厂方法和简单工厂主要分别是,简单工厂类中有了所有的逻辑判断,可以根据客户端的选择动态的选择要实列化的类,对于客户端来说,除去了与具体产品的依赖,而工厂方法,在以后要改动的情况下可以不用去改工厂类了,而只用加运算类,加工厂类就行,

原文地址:https://www.cnblogs.com/xu3593/p/2826555.html