淺談C# Reflection用處
動手操作第一版本
而為了實現這個業務需要涉及三張表的數據。(存放單據的表、審核意見表、審核狀態表)
三張表的關系：單據表1：1審核狀態表，單據表1：N審核意見表
為了實現讓View頁面整潔，我定義了一個SpecialPrintModel類
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public class SpecialPrintModel
{
/// <summary>
/// 供應商承擔
/// </summary>
public string SupplierUnderTaker { get; set; }
/// <summary>
/// 客戶訂單號
/// </summary>
public string CustomerSerialNumber { get; set; }
/// <summary>
/// 付款金額
/// </summary>
public decimal PayAmount { get; set; }
/// <summary>
/// 開戶行
/// </summary>
public string OpeningBank { get; set; }
/// <summary>
/// 收款單位
/// </summary>
public string CollectionMonad { get; set; }
/// <summary>
/// 銀行帳號
/// </summary>
public string BankAccount { get; set; }
/// <summary>
/// 經辦人
/// </summary>
public string ResponseiblePerson { get; set; }
/// <summary>
/// 分管領導
/// </summary>
public string Leader { get; set; }
/// <summary>
/// 財務審核
/// </summary>
public string FinanceApproval { get; set; }
/// <summary>
/// 財務經理審核
/// </summary>
public string FinanceManagerApproval { get; set; }
/// <summary>
/// 財務總監審核
/// </summary>
public string FinanceDirectorApproval { get; set; }
/// <summary>
/// CEO審核
/// </summary>
public string CEOApproval { get; set; }
/// <summary>
/// 流水號
/// </summary>
public string SerialNumber { get; set; }
}
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public List<ShipSpecialPrintModel> GetTobePaidRecepit(ShipSpecialSearch search)
{
List<ShipSpecialPrintModel> curiseShipModel = new List<ShipSpecialPrintModel>();
var toBePaidModel = persistant.GetTobePaidRecepit(search);//查找出待支付的單據表信息
ArrayList serialArray=new ArrayList();//定義一個流水號列表
toBePaidModel.ForEach((u) => { serialArr.Add(u.SerialNumber); });
var toBePaidComment = persistant.GetTobePaidRecepitComment(serialArr);//查找出待支付單據的審核意見表(1個單據對應多少審核意見)
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
}
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呵呵，上面的代碼基本完成了業務的需求，可是如果業務需要打印出CTO的名稱、CIO的名稱那在if else這邊加，雖然很簡單但是違背了開放-封閉的原則。故本人決定用反射去完成這if...else的事情。
因為if...else裡面的判斷是當前的這筆單據的審核意見表的層級是不是跟SpecialPrintModel的字段所對應的層級相等，若相等則在對應字段寫入相對應的名稱。決定把SpecialPrintModel這個類修改下。
動手操作第二版本
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public class ShipSpecialPrintModel
{
/// <summary>
/// 供應商承擔
/// </summary>
public string SupplierUnderTaker { get; set; }
/// <summary>
/// 客戶訂單號
/// </summary>
public string CustomerSerialNumber { get; set; }
/// <summary>
/// 付款金額
/// </summary>
public decimal PayAmount { get; set; }
/// <summary>
/// 開戶行
/// </summary>
public string OpeningBank { get; set; }
/// <summary>
/// 收款單位
/// </summary>
public string CollectionMonad { get; set; }
/// <summary>
/// 銀行帳號
/// </summary>
public string BankAccount { get; set; }
/// <summary>
/// 經辦人
/// </summary>
public string ResponseiblePerson { get; set; }
/// <summary>
/// 分管領導
/// </summary>
[LevelAttribute(Level = 1)]
public string Leader { get; set; }
/// <summary>
/// 財務審核
/// </summary>
[LevelAttribute(Level = 2)]
public string FinanceApproval { get; set; }
/// <summary>
/// 財務經理審核
/// </summary>
[LevelAttribute(Level = 3)]
public string FinanceManagerApproval { get; set; }
/// <summary>
/// 財務總監審核
/// </summary>
[LevelAttribute(Level = 4)]
public string FinanceDirectorApproval { get; set; }
/// <summary>
/// CEO審核
/// </summary>
[LevelAttribute(Level = 5)]
public string CEOApproval { get; set; }
/// <summary>
/// 流水號
/// </summary>
public string SerialNumber { get; set; }
}
public class LevelAttribute : Attribute
{
public int Level { get; set; }
}
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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);
}
});
})
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然而看到，propertyInfos那邊基本上每循環一次都需要去反射查找下元素，為了避免這樣的性能消耗，決定再修改一翻,定義一個字典去存儲SpecialPrintModel標有特性類的字段。
動手操作第三版本
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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);
}
});
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總體經過三次的修改，已經避免if...else的代碼。這樣而言，也比較適合後面比如再需要打印CTO審核的名稱。那樣只需要再Model類裡面填寫字段與在字段上加上個特效。
