Coding guideline

Coding Guideline 報告人： Nelson Chuang 部門： DC

簡報大綱 ,[object Object],[object Object],[object Object],[object Object]

什麼是好的程式碼 ? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

重要原則 ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object]

寫碼習慣 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

寫碼習慣 ,[object Object],[object Object]

寫碼習慣 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

寫碼習慣 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

寫碼習慣 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

寫碼習慣 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

寫碼習慣 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

寫碼習慣 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

較佳的編碼方式 ,[object Object],[object Object],[object Object],[object Object]

何謂重構 ,[object Object],[object Object],[object Object],[object Object]

何謂預構 ,[object Object],[object Object]

[object Object],Refactor Sub printOwing() printBanner() ‘ print details Console.WriteLine(“name:”&_name) Console.WriteLine(“amount”& getOutstanding()) End Sub Refactoring 前 Sub printOwing() printBanner() printDetails(getOutstanding()) End Sub Sub printDetails (ByVal outstanding As double) Console.WriteLine(“name:”&_name) Console.WriteLine(“amount” & outstanding) End Sub Refactoring 後

[object Object],Refactor Function getPayAmount() As Double Dim result As Double lf_isDead Then result=deadAmount() Else lf_isSeparated Then result=separatedAmount() Else lf_isRetired Then result=retiredAmount() Else result=normalPayAmount() End lf End lf End lf Return result End Function Refactoring 前 Function getPayAmount() As Double lf_isDead Then Return deadAmount() End lf lf_isSeparated Then Return separatedAmount() End lf lf_isRetired Then Return retiredAmount() End lf Return normalPayAmount() End Function Refactoring 後

[object Object],Refactor Function disabilityAmount() As Double lf_seniority < 2 Then Return 0 End lf lf_monthsDisabled > 12 Then Return 0 End lf lf_isPartTime Then Return 0 End lf ‘ compute the disability amount End Function Refactoring 前 Function disabilityAmount() As Double lf isNotEligableForDisability() Then Return 0 End lf ‘ compute the disability amount End Function Refactoring 後

[object Object],Refactor lf is SpecialDeal() Then total = price * 0.95 send() Else total = price * 0.98 send() End lf Refactoring 前 lf is SpecialDeal() total = price * 0.95 Else total = pirce * 0.98 End lf Send() Refactoring 後

[object Object],Refactor lf Date.before(SUMMER_START) Or Date.after(SUMMER_END) Then charge = quantity * _winterRate + _winterServiceCharge Else charge = quantity * _summerRate End lf Refactoring 前 lf notSummer(date) Then charge = winterCharge(quantity) Else charge = summerCharge(quantity) End lf Refactoring 後

[object Object],Refactor Function lastReading() As Object Return readings.lastElement() End Function Refactoring 前 Function lastReading() As Reading Return CType(readings.lastElement(), Reading) End Function Refactoring 後

Refactor ,[object Object],Class Class 1 Public _name As String End Class Refactoring 前 Class Class 1 Private _name As String Public Function getName() As String Return _name End Function Public Sub setName(ByVal arg As String) _name = arg End Sub End Class Refactoring 後

Refactor ,[object Object],Function getRating() As lnteger Return llf(more ThanFiveLateDeliveries(), 2, 1) End Function Function more ThanFiveLateDeliveries() As Boolean Return_numberOfLateDeliveries > 5 End Function Refactoring 前 Function getRating() As lnteger Return llf(_numberOfLateDeliveries > 5, 2, 1) End Function Refactoring 後

[object Object],Refactor Dim basePrice As Double = anOrder.basePrice() Return (basePrice > 1000) Refactoring 前 Return anOrder.basePrice() > 1000 Refactoring 後

[object Object],Refactor If platform.ToUpper().lndexOf(“MAC”) > -1 And _ browser.ToUpper().lndexOf(“IE”) > -1 And _ wasInitialized() And resize > 0 Then ‘ do something End If Refactoring 前 Dim isMacOs As Boolean = platform.ToUpper().IndexOf(“MAC”) > -1 Dim is IE Browser As Boolean = browser.ToUpper().IndexOf(“IE”) > -1 Dim was Resized As Boolean = Resize > 0 If isMacOs && isIEBrowser && wasInitialized() && wasResized Then ‘ do something End If Refactoring 後

[object Object],Refactor Function getExpenseLimit() As Double ‘ should have either expense limit or a primary project return IIF(_expenseLimit !=NULL_EXPENSE,_expenseLimit,_ _primaryProject.getMemberExpenseLimit()) End Function Refactoring 前 Function getExpenseLimit() As Double Debug.Assert(_expenseLimit != NULL_EXPENSE Or _primaryProject != null) return IIF(_expenseLimit != NULL_EXPENSE, _expenseLimit, _ _primaryProject.getMemberExpenseLimit()) End Function Refactoring 後

[object Object],Refactor Dim newStart As Date Time = New Date Time(previous End.Year(), _ previous End.Month(), previousEnd.Day() + 1) Refactoring 前 Dim newStart As DateTime = nextDay(previousEnd) Private Shared Function nextDay(ByVal arg As DateTime) As DateTime Return New DateTime(arg.Year(), arg.Month(), arg.Day() + 1) End Function Refactoring 後

[object Object],Refactor Dim low As Integer = daysTempRange().getLow() Dim high As Integer = daysTempRange().getHigh() withinPlan = plan.withinRange(low, high) Refactoring 前 withinPlan = plan.withinRange(daysTempRange()) Refactoring 後

[object Object],Refactor Public Class Manager Inherits Employee Public Sub New(ByVal name As String, ByVal id As String) _name = name _id = id End Sub End Class Refactoring 前 Public Class Manager Inherits Employee Public Sub New(ByVal name As String, ByVal id As String) MyBase.New(name, id) End Sub End Class Refactoring 後

[object Object],Refactor Sub foo() Dim I As Integer = 7 ‘ I is not used here If someCondition Then ‘ i is used only within this block End If ‘ i is not used here End Sub Refactoring 前 Sub foo() If someCondition Then Dim i as integer = 7 ‘ i is used only within this block End If End Sub Refactoring 後

[object Object],Refactor Function discount(ByVal inputVal As Integer, ByVal quantity As Integer, _ ByVal yearToDate As Integer) As Integer If inputVal > 50 Then inputVal-= 2 End If End Function Refactoring 前 Function discount(ByVal inputVal As Integer, ByVal quantity As Integer, _ ByVal yearToDate As Integer) As Integer Dim result As Integer = inputVal If inputVal > 50 Then result -= 2 End If End Function Refactoring 後

[object Object],Refactor If Not item.isNotFound() Then End If Refactoring 前 If item.isFound() Then End If Refactoring 後

[object Object],Refactor Function withdraw(ByVal amount As Integer) As Integer If amount > _balance Then Return -1 Else _balance -= amount Return 0 End If End Function Refactoring 前 Sub withdraw(ByVal amount As Integer) If amount > _balance Then Throw New BalanceException _balance -= amount End If End Sub Refactoring 後

[object Object],Refactor Function getValueForPeriod(ByVal periodNumber As Integer) As Double Try Return _values(periodNumber) Catch ex As IndexOutOfRangeException Return 0 End Try End Function Refactoring 前 Function getValueForPeriod(ByVal periodNumber As Integer) As Double If periodNumber >= _values.Length Then Return 0 End If Return _values(periodNumber) End Function Refactoring 後

[object Object],Refactor Public Sub countDown(ByVal n As Integer) If n = 0 Then Return End If waitASecond() countDown(n - 1) End Sub Refactoring 前 Public Sub countDown(ByVal n As Integer) While n > 0 waitASecond() n -= 1 End While End Sub Refactoring 後

[object Object],Refactor Sub printValues() Dim i As Integer For i = 0 To people.Length - 1 Console.WriteLine(people(i).name & “ has salary “ & people(i).salary) Next End Sub Refactoring 前 Sub printValues(ByVal outfile As PrintStream) Dim i As Integer For i = 0 To people.Length - 1 outfile.printIn(people(i).name & “ has salary “ & people(i).salary) Next End Sub Refactoring 後

效能 (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

效能 (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ASP 效能 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ASP 效能 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ASP.NET 效能 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ASP.NET 效能 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

效能計數器重點觀察指標計數器說　明 # of Exceptions Thrown 引發例外的總次數效能物件 .NET CLR Exceptions # Gen x Collections Gen x 物件被 Garbage Collector 回收的次數 .NET CLR Memory % Time In GC ASP.NET 程式花在回收物件的時間比例 .NET CLR Memory Promoted Memory from Gen X Gen X 物件沒有被回收，而升級成為 Gen Y 物件所佔用的記憶體量 .NET CLR Memory Available MBytes 可用的記憶體數 ( 和 Memory Leak 有關 ) Memory % Processor Time 程式執行花掉的 CPU 時間比例 Process % Processor Time CPU 花在執行所有程式的時間比例 Processor User Connections 資料庫的使用者連線數 SQL Server : General Statistics

SQL 效能 ,[object Object],[object Object],[object Object],[object Object],[object Object]

SQL 效能 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SQL 效能 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SQL 效能 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SQL 效能 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SQL 效能 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SQL 效能 ,[object Object],[object Object],[object Object]

相關資源 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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