代码的重构（Refactor-Extract）

1、vs中的代码重构快捷方式：Refactor-Extract；

选中两个需要重构的部分完整代码，右击，选中Refactoe-Extract-Extract Method；

该选中的代码会自动形成一个Execute()方法，自己修改方法名就OK啦。

2、下面说一下我的具体代码修改：这个是两个方法中执行了相同的INSERT语句，所以将它整合成一个方法；这样后续有修改或者改动时，会方便很多，也便于代码阅读。

 //APP端（插入T_UserBookingTraining）
 public int SubscribeIntentionMajor(int courseId, int shareUserId, string name, string phoneNum, string intentionMajor)
         {
             var type = 1;
             string tidSql = @"
 IF EXISTS(
         SELECT   tcl.TrainingInstitutionId
         FROM    dbo.T_Course tc
         LEFT JOIN dbo.T_Class tcl ON tc.ClassId = tcl.Id
         WHERE  tc.Id = @cid)
         SELECT  tcl.TrainingInstitutionId
         FROM    dbo.T_Course tc
         LEFT JOIN dbo.T_Class tcl ON tc.ClassId = tcl.Id
         WHERE  tc.Id = @cid
 ELSE
     SELECT 0";
             var tid = DbTopOnline.ExecuteScalar<int>(tidSql, new { cid = courseId });

             return InsertUserBookingTraining(shareUserId, name, phoneNum, intentionMajor, tid, type);
         }

 //官网端（插入T_UserBookingTraining）
 public int SubscribeIntentionMajorFromWebSite(string phoneNum, int tid)
         {
             var shareUserId = ;
             var name = phoneNum;
             var intentionMajor = "来自官网的意向";
             var type = 2;
             return InsertUserBookingTraining(shareUserId, name, phoneNum, intentionMajor, tid, type);
         }

 //重构出来的代码（主要执行INSERT操作）
 private int InsertUserBookingTraining(int shareUserId, string name, string phoneNum, string intentionMajor, int tid, int type)
         {
             string userIdSql = @"
 SELECT
     tu.Id
 FROM
     dbo.T_User tu
 WHERE
     tu.TrainingInstitutionId = @tid
     AND Name = 'admin'
     AND IsDel=0
     AND IsUsed=1";
             var userId = DbTopManager.ExecuteScalar<int>(userIdSql, new { tid });

             string sql = @";
 IF EXISTS(SELECT * FROM T_UserBookingTraining WHERE Phone = @phoneNum AND TrainingInstitutionId = @tid )  --判断手机号
     BEGIN
             UPDATE   dbo.T_UserBookingTraining
             SET      Intention = @intentionMajor, UserName = @name
             WHERE    Phone = @phoneNum
     END
 ELSE
     BEGIN
         INSERT INTO dbo.T_UserBookingTraining
                     ( TrainingInstitutionId ,
                     TemplatId ,
                     SceneId ,
                     Type ,
                     UserId ,
                     ShareUserId ,
                     Phone ,
                     UserName ,
                     Intention ,
                     ProgressStatus ,
                     IsDel ,
                     IsUsed ,
                     CreateTime
                     )
             VALUES  ( @tid, -- TrainingInstitutionId - int
                     0 , -- TemplatId - int
                     0 , -- SceneId - int
                     @type , -- Type - tinyint
                     @userId , -- UserId - int
                     @uid, -- ShareUserId - int
                     @phoneNum, -- Phone - nchar(11)
                     @name, -- UserName - nvarchar(20)
                     @intentionMajor, -- Intention - nvarchar(60)
                     0 , -- ProgressStatus - tinyint
                     0 , -- IsDel - bit
                     1 , -- IsUsed - bit
                     GETDATE()  -- CreateTime - datetime
                     )
     END";
             return DbTopOnline.Execute(sql, new
             {
                 userId,
                 uid = shareUserId,
                 name,
                 phoneNum,
                 intentionMajor,
                 tid,
                 type
             });
         }