一次还算成功的重构实例

帮朋友重构的，重构的原则:消除过多的变量，消除控制结构的嵌套

重构之前

  1         protected void btnSubmit_Click(object sender, EventArgs e)
  2         {
  3             string content = this.txtContent.Value;
  4             string phones = "";
  5             string[] arrphone = null;
  6       
  7             int mobilenum = 0;  //输入的号码个数
  8             int insertcount = 0;//记录插入成功条数
  9             int errorcount = 0;//记录错误信息条数
 10             ClassMain cm = new ClassMain();
 11 
 12             string username ="sys";
 13             string sendChannel="";
 14             int priority =0;
 15             string sendContent=content;
 16             string mobile="";
 17             string code="";
 18             UserInfo userinfo = cm.getUserInfo("sys");
 19             if (userinfo == null)
 20             {
 21                 WebUtility.Alert(this, "系统专用群发帐户不存在，请先开通帐户名为:sys的帐户！");
 22                 return;
 23             }
 24             priority = userinfo.priority;
 25      
 26 
 27             if (string.IsNullOrEmpty(content.Trim()))
 28             {
 29                 WebUtility.Alert(this, "短信内容不可为空，请输入短信内容！");
 30                 return;
 31 
 32             }
 33                      
 34             if (!string.IsNullOrEmpty(this.txtPhone.Text.Trim()))
 35             {
 36           
 37                  phones = this.txtPhone.Text.Replace(" ", "");
 38                  arrphone = phones.Split(new string[] { ",", "，", ";", "；", "\r\n", "\n", "\t" }, System.StringSplitOptions.RemoveEmptyEntries);
 39             
 40                 if (arrphone !=null && arrphone.Length > 0)
 41                 {
 42                
 43                     for (int i = 0; i < arrphone.Length; i++)
 44                     {
 45                         mobile = arrphone[i];
 46                         if (System.Text.RegularExpressions.Regex.IsMatch(mobile, "^[1][3458]\\d{9}$"))
 47                         {
 48                             mobilenum++;
 49                             
 50                             switch (hodgepodge.telecomoperators(mobile))
 51                             {
 52                                 case 1:
 53                                     sendChannel = userinfo.ydSendChannel;
 54                                     break;
 55 
 56                                 case 2:
 57                                     sendChannel = userinfo.ltSendChannel;
 58                                     break;
 59                                 case 3:
 60                                     sendChannel = userinfo.dxSendChannel;
 61                                     break;
 62                                 default:
 63                                     sendChannel = userinfo.dxSendChannel;
 64                                     break;
 65                             }
 66 
 67                             code = cm.getportNumber(sendChannel) + userinfo.serviceCode;
 68 
 69                             if (cm.Insert_sms_send_batch(username, sendChannel, priority, sendContent, mobile, code) > 0)
 70                             {
 71                                 insertcount++;
 72                             }
 73 
 74                         }
 75                         else
 76                         {
 77                             errorcount++;
 78                         }
 79 
 80                     }
 81 
 82                 }
 83 
 84                 if (mobilenum > 0)
 85                 {
 86 
 87                     string AlertText = "共有" + mobilenum+ "个合法的手机号码，";
 88                     if (insertcount > 0)
 89                         AlertText += "其中" + insertcount + "个手机号码提交成功！";
 90 
 91                     if (errorcount > 0)
 92                         AlertText += errorcount + "个因格式不正确没有提交！"; 
 93 
 94                     WebUtility.Alert(this, AlertText);
 95                     string stime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
 96                     string remark = AlertText;
 97                     cm.addActionlog(u.username, u.usernamecn, stime, "群发", Request.UserHostAddress, remark);
 98                         
 99                      
100                 }
101                 else
102                 {
103                     WebUtility.Alert(this, "无合法的手机号码，发送提交不成功！");
104 
105                 }
106             }
107             else
108             {
109                 WebUtility.Alert(this, "手机号码不可为空，请输入手机号码！");
110                 return;
111             }
112 
113 
114         }

重构之后

  1         bool isValidPhoneNumber(string mobile)
  2         {
  3             return System.Text.RegularExpressions.Regex.IsMatch(mobile, "^[1][3458]\\d{9}$");
  4         }
  5 
  6         string[] getPhoneList(string txtPhoneList)
  7         {
  8             string phones = txtPhoneList.Replace(" ", "");
  9             return phones.Split(new string[] { ",", "，", ";", "；", "\r\n", "\n", "\t" }, System.StringSplitOptions.RemoveEmptyEntries);    
 10         }
 11 
 12         string[] siftOutVaildPhone(string[] phoneList)
 13         {
 14             List<string> vaildList = new List<string>();
 15             foreach(string phone in phoneList)
 16             {
 17                 if (isValidPhoneNumber(phone))
 18                 {
 19                     vaildList.Add(phone);
 20                 }
 21             }
 22             return vaildList.ToArray();
 23         }
 24 
 25         string getChanel(string mobile, UserInfo userinfo)
 26         { 
 27             switch (hodgepodge.telecomoperators(mobile))
 28             {
 29                 case 1:
 30                     return userinfo.ydSendChannel;
 31 
 32                 case 2:
 33                      return userinfo.ltSendChannel;
 34 
 35                 case 3:
 36                     return userinfo.dxSendChannel;
 37 
 38                 default:
 39                     return userinfo.dxSendChannel;
 40             }
 41         }
 42 
 43         void PrintMessage(int mobilenum, int insertcount, int errorcount,ClassMain cm)
 44         {
 45             string AlertText = "共有" + mobilenum + "个合法的手机号码，";
 46             if (insertcount > 0)
 47                 AlertText += "其中" + insertcount + "个手机号码提交成功！";
 48 
 49             if (errorcount > 0)
 50                 AlertText += errorcount + "个因格式不正确没有提交！";
 51 
 52             WebUtility.Alert(this, AlertText);
 53             string stime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
 54             string remark = AlertText;
 55             cm.addActionlog(u.username, u.usernamecn, stime, "群发", Request.UserHostAddress, remark);        
 56         }
 57 
 58         protected void btnSubmit_Click(object sender, EventArgs e)
 59         {
 60             string[] allPhoneList = null;
 61             string[] vaildPhoneList = null;
 62             int insertCount = 0;//记录插入成功条数
 63             ClassMain dbHelper = new ClassMain();
 64 
 65             string username ="sys";
 66             UserInfo userinfo = dbHelper.getUserInfo(username);
 67             if (userinfo == null)
 68             {
 69                 WebUtility.Alert(this, "系统专用群发帐户不存在，请先开通帐户名为:sys的帐户！");
 70                 return;
 71             }
 72 
 73             if (string.IsNullOrEmpty(this.txtContent.Value.Trim()))
 74             {
 75                 WebUtility.Alert(this, "短信内容不可为空，请输入短信内容！");
 76                 return;
 77             }
 78 
 79             if (string.IsNullOrEmpty(this.txtPhone.Text.Trim()))
 80             {
 81                 WebUtility.Alert(this, "手机号码不可为空，请输入手机号码！");
 82                 return;
 83             }
 84 
 85             //先取出整个点好号码列表，再筛选出来正确的号码
 86             allPhoneList = getPhoneList(this.txtPhone.Text);
 87             vaildPhoneList = siftOutVaildPhone(allPhoneList);
 88 
 89             if (allPhoneList == null || allPhoneList.Length == 0)
 90             {
 91                 WebUtility.Alert(this, "无合法的手机号码，发送提交不成功！");
 92                 return;
 93             }
 94             
 95 
 96             //通过合法性检测以后的逻辑
 97             for (int i = 0; i < vaildPhoneList.Length; i++)
 98             {
 99                 string sendChannel = getChanel(vaildPhoneList[i], userinfo);
100                 string code = dbHelper.getportNumber(sendChannel) + userinfo.serviceCode;
101                 if (dbHelper.Insert_sms_send_batch(username, sendChannel, userinfo.priority, this.txtContent.Value, vaildPhoneList[i], code) > 0)
102                 {
103                     insertCount++;
104                 }
105             }
106 
107             PrintMessage(vaildPhoneList.Length, insertCount, allPhoneList.Length - vaildPhoneList.Length, dbHelper);
108 
109         }

过程：

第一次完成基本功能（不包含错误的号码个数统计）整个过程只发生了两个编译错误（isValidPhoneNumber函数返回值定义成string而不是bool,PrintMessage函数定义成string而不是int）一个逻辑错误忘记调用isValidPhoneNumber验证正确的号码

第二次添加统计错误的号码有多少的功能，把getVaildPhoneList（该函数不存在了）分拆成getPhoneList和siftOutVaildPhone两个函数，一次通过编译和执行，0编译错误，0逻辑错误，还是能看出来，清晰正确的代码对于写出正确的代码有多重要！

bug:

重构过之后的29行有一个逻辑bug，他应该检测的是vaildPhoneList结果而不是allPhoneList,因为代码原本的意图是如果没有合法的号码，我就不向下执行了，如果检测总的号码列表，当全部都是坏号码时也能继续执行，但是这个问题是怎么产生的呢？我还能回忆出上次重构的过程，产生的原因是：进行第二次重构时，我只有一个电话号码列表，叫phoneList，重构前的代码是判断列表是不是空的，是空的不让向下执行，我重构的第一步是吧phoneList重命名成allPhoneList（使用VS的重构功能，相关的引用都自己改变了,结果if里的名字被自动该成了allPhoneList）之后添加vaildPhoneList，就忘了修改89行的条件。。。