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
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。
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
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; } }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 } 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
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; } }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); } }); })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
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); } });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！
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