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浅谈C# Reflection用处

时间:2014-09-04 00:05:07      阅读:244      评论:0      收藏:0      [点我收藏+]

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   乱侃

       作为一名新手,一直没有勇气去写一篇分享。原因有很多:诸如:自己水平有限、语言表达不准确、写出的东西没有一点技术点被人嘲笑。今天在公司听了内部员工的一个分享,其中最重要的一点是:提升自身水平的最佳的途径就是——交流。不管你是通过什么途径,交流也好、整理成文字分享也好等等都是很好的方式。故此,今天献丑写一篇自己的心得分享,欢迎各路大神的指教!

   需求背景

     bubuko.com,布布扣今天接到的需求里面有个这样的需求,如下图所示,需要打印出如Excel内容呈现的单据。bubuko.com,布布扣

     

    动手操作第一版本

     而为了实现这个业务需要涉及三张表的数据。(存放单据的表、审核意见表、审核状态表)
     三张表的关系:单据表1:1审核状态表,单据表1:N审核意见表
     为了实现让View页面整洁,我定义了一个SpecialPrintModel类
bubuko.com,布布扣
   public class SpecialPrintModel
    {
        /// <summary>
        /// 供应商承担
        /// </summary>
        public string SupplierUnderTaker { get; set; }

        /// <summary>
        /// 客户订单号
        /// </summary>
        public string CustomerSerialNumber { get; set; }
       
        /// <summary>
        /// 付款金额
        /// </summary>
        public decimal PayAmount { get; set; }

        /// <summary>
        /// 开户行
        /// </summary>
        public string OpeningBank { get; set; }

        /// <summary>
        /// 收款单位
        /// </summary>
        public string CollectionMonad { get; set; }

        /// <summary>
        /// 银行帐号
        /// </summary>
        public string BankAccount { get; set; }

        /// <summary>
        /// 经办人
        /// </summary>
        public string ResponseiblePerson { get; set; }

        /// <summary>
        /// 分管领导
        /// </summary>
        public string Leader { get; set; }

        /// <summary>
        /// 财务审核
        /// </summary>
        public string FinanceApproval { get; set; }

        /// <summary>
        /// 财务经理审核
        /// </summary>
        public string FinanceManagerApproval { get; set; }

        /// <summary>
        /// 财务总监审核
        /// </summary>
        public string FinanceDirectorApproval { get; set; }

        /// <summary>
        /// CEO审核
        /// </summary>
        public string CEOApproval { get; set; }

        /// <summary>
        /// 流水号
        /// </summary>
        public string SerialNumber { get; set; }
    }
View Code

 

     

bubuko.com,布布扣
 public List<ShipSpecialPrintModel> GetTobePaidRecepit(ShipSpecialSearch search)
 {
     List<ShipSpecialPrintModel> curiseShipModel = new List<ShipSpecialPrintModel>();
     var toBePaidModel = persistant.GetTobePaidRecepit(search);//查找出待支付的单据表信息
     ArrayList serialArray=new ArrayList();//定义一个流水号列表
     toBePaidModel.ForEach((u) => { serialArr.Add(u.SerialNumber); });
     var toBePaidComment = persistant.GetTobePaidRecepitComment(serialArr);//查找出待支付单据的审核意见表(1个单据对应多少审核意见)
     foreach (var item in toBePaidModel)
     {
          ShipSpecialPrintModel  temp = new ShipSpecialPrintModel()
         {
                 SupplierUnderTaker = supplierUnderTaker;
                 CustomerSerialNumber = item.CustomerOrderNumber;
                 PayAmount = item.PayAmount;
                 OpeningBank = item.PayBank;
                 CollectionMonad = item.Payee;
                 ResponseiblePerson = item.Creator;
                 SerialNumber = item.SerialNumber;
          };
          curiseShipModel.Add(temp);
     }
       foreach (var curise in curiseShipModel)
            {
                foreach (var comment in toBePaidComment)
                {
                    if (comment.SerialNumber == curise.SerialNumber)
                    {
                        if (comment.ApprovalLevel == (int)LevelType.BranchedLeader)
                        {
                            curise.Leader = comment.Creator;
                        }
                        else if (comment.ApprovalLevel == (int)LevelType.Finance)
                        {
                            curise.FinanceApproval = comment.Creator;
                        }
                        else if (comment.ApprovalLevel == (int)LevelType.FinanceManager)
                        {
                            curise.FinanceManagerApproval = comment.Creator;
                        }
                        else if (comment.ApprovalLevel == (int)LevelType.ProjectDirector)
                        {
                            curise.FinanceDirectorApproval = comment.Creator;
                        }
                        else if (comment.ApprovalLevel == (int)LevelType.CEO)
                        {
                            curise.CEOApproval = comment.Creator;
                        }
                    }
                }
            }

     return curiseShipModel
 }
View Code

 

    呵呵,上面的代码基本完成了业务的需求,可是如果业务需要打印出CTO的名称、CIO的名称那在if else这边加,虽然很简单但是违背了开放-封闭的原则。故本人决定用反射去完成这if...else的事情。
因为if...else里面的判断是当前的这笔单据的审核意见表的层级是不是跟SpecialPrintModel的字段所对应的层级相等,若相等则在对应字段写入相对应的名称。决定把SpecialPrintModel这个类修改下。
 

   动手操作第二版本

    

bubuko.com,布布扣
   public class ShipSpecialPrintModel
    {
        /// <summary>
        /// 供应商承担
        /// </summary>
        public string SupplierUnderTaker { get; set; }

        /// <summary>
        /// 客户订单号
        /// </summary>
        public string CustomerSerialNumber { get; set; }
       
        /// <summary>
        /// 付款金额
        /// </summary>
        public decimal PayAmount { get; set; }

        /// <summary>
        /// 开户行
        /// </summary>
        public string OpeningBank { get; set; }

        /// <summary>
        /// 收款单位
        /// </summary>
        public string CollectionMonad { get; set; }

        /// <summary>
        /// 银行帐号
        /// </summary>
        public string BankAccount { get; set; }

        /// <summary>
        /// 经办人
        /// </summary>
        public string ResponseiblePerson { get; set; }

        /// <summary>
        /// 分管领导
        /// </summary>
        [LevelAttribute(Level = 1)]
        public string Leader { get; set; }

        /// <summary>
        /// 财务审核
        /// </summary>
         [LevelAttribute(Level = 2)]
        public string FinanceApproval { get; set; }

        /// <summary>
        /// 财务经理审核
        /// </summary>
         [LevelAttribute(Level = 3)]
        public string FinanceManagerApproval { get; set; }

        /// <summary>
        /// 财务总监审核
        /// </summary>
         [LevelAttribute(Level = 4)]
        public string FinanceDirectorApproval { get; set; }

        /// <summary>
        /// CEO审核
        /// </summary>
         [LevelAttribute(Level = 5)]
        public string CEOApproval { get; set; }

        /// <summary>
        /// 流水号
        /// </summary>
        public string SerialNumber { get; set; }
    }

    public class LevelAttribute : Attribute
    {
        public int Level { get; set; }
    }
View Code

 

    

bubuko.com,布布扣
  var toBePaidComment = persistant.GetTobePaidRecepitComment(ArrayList.Adapter(toBePaidModel.Select(u => u.SerialNumber).ToList()));
   var specialPropertyInfo = (from property in typeof(CuriseShipSpecialPrintModel).GetProperties()
                                       where property.GetCustomAttributes(typeof(LevelAttribute), false).Count() > 0
                                       select property).ToList();

  toBePaidModel.ForEach((item)=>{
       ShipSpecialPrintModel  temp = new ShipSpecialPrintModel()
         {
                 SupplierUnderTaker = supplierUnderTaker;
                 CustomerSerialNumber = item.CustomerOrderNumber;
                 PayAmount = item.PayAmount;
                 OpeningBank = item.PayBank;
                 CollectionMonad = item.Payee;
                 ResponseiblePerson = item.Creator;
                 SerialNumber = item.SerialNumber;
          };
       var thisComments=toBePaidComment.Where(u=>u.SerialNumber =item.SerialNumber ).ToList();
       thisComment.ForEach((cm)=>
       {
         if(cm.ApprovalLevel==(specialPropertyInfo.GetCustomAttributes(typeof(LevelAttribute),false).First() as LevelAttribute).Level)
          {
              cm.SetValue(model,cm.Creator,null);
          } 
        });
  })
View Code

    然而看到,propertyInfos那边基本上每循环一次都需要去反射查找下元素,为了避免这样的性能消耗,决定再修改一翻,定义一个字典去存储SpecialPrintModel标有特性类的字段。

 

   动手操作第三版本

    

bubuko.com,布布扣
  Dictionary<int, PropertyInfo> dic = new Dictionary<int, PropertyInfo>();
   propertyInfos.ForEach((myProperty) => {            dic.Add((a.GetCustomAttributes(typeof(LevelAttribute),false).First() as LevelAttribute).Level,myProperty));
      } );

  comments.ForEach((cm) =>
                    {
                            if (dic.Keys.Contains(cm.ApprovalLevel))
                            {
                                dic[cm.ApprovalLevel].SetValue(model, cm.Creator, null);
                            }
                    });
View Code

 

   总体经过三次的修改,已经避免if...else的代码。这样而言,也比较适合后面比如再需要打印CTO审核的名称。那样只需要再Model类里面填写字段与在字段上加上个特效。

  总结

      就像我同事说的那样,做任务事情只要想想、多敲几次。一些问题就不是问题了。好了,今天就写到这里吧。晚安各位!2014年9月3日 23:09:20

浅谈C# Reflection用处

标签:style   blog   http   color   os   io   ar   for   数据   

原文地址:http://www.cnblogs.com/yansong-xu/p/3954992.html

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