//Calculate count.... ... return count; } int count = myObj.Count; for (int i = 0; i < count; ++i) { for (int j = 0; j < count; ++j) ... } }

#region Event event NameChangingEventHandler NameChanging; event NameChangedEventHandler NameChanged; #endregion</pre> #region Event event EventHandler<FriendEventArgs> FriendAdded; #endregion #region Protected Method protected void OnFriendAdded(FriendEventArgs e) { if (FriendAdded == null) return; FriendAdded(this, e); } #endregion #region Public Method public void AddFriend(Person friend) { Friends.Add(friend); OnFriendAdded(new FriendEventArgs(friend.Name)); } #endregion … class FriendEventArgs : EventArgs { #region Var private String _name; #endregion #region Property public String Name { get { if (_name == null) return String.

Console.WriteLine(string.Format("ReferenceEquals(str1, str2) = {0}", ReferenceEquals(str1, str2))); Console.WriteLine(string.Format("ReferenceEquals(str1, str3) = {0}", ReferenceEquals(str1, str3))); Console.WriteLine(string.Format("ReferenceEquals(str1, str4) = {0}", ReferenceEquals(str1, str4))); </pre></div> Console.WriteLine(string.Format("ReferenceEquals(str1, str2) = {0}", ReferenceEquals(str1, str2))); Console.WriteLine(string.Format("ReferenceEquals(str1, str3) = {0}", ReferenceEquals(str1, str3))); </pre></div> str2 = string.Intern(str2); str3 = string.Intern(str3); Console.WriteLine(string.Format("ReferenceEquals(str1, str2) = {0}", ReferenceEquals(str1, str2))); Console.WriteLine(string.Format("ReferenceEquals(str1, str3) = {0}", ReferenceEquals(str1, str3)));</pre></div> str1 = string.Intern(str1); Console.WriteLine(string.Format(@"String.IsInterned(str1) = {0}", String.IsInterned(str1) != null));</pre></div> private static void Test(int testCount, int stringLength) { NormalCompare1(string.Empty, string.Empty); NormalCompare2(string.

namespace ConsoleApplication6 { class Program { static void Main() { TestThrow(); TestThrowEx(); } static void ThrowException() { throw new Exception(); } static void TestThrow() { try { try { ThrowException(); } catch (Exception) { throw; } } catch (Exception ex) { Console.WriteLine("TestThrow"); Console.WriteLine(ex.StackTrace); Console.WriteLine(new string('=',50)); } } static void TestThrowEx() { try { try { ThrowException(); } catch (Exception ex) { throw ex; } } catch (Exception ex) { Console.

Private Sub Application_ThreadException(ByVal sender As Object, ByVal e As EventArgs) ... End Sub</pre></div>

Private _enableLogData As Boolean Public Property EnableLogData() As Boolean Get Return _enableLogData End Get Set(ByVal value As Boolean) _enableLogData = value End Set End Property Event Executing As EventHandler Event Executed As EventHandler Protected Sub OnExecuting(ByVal e As EventArgs) RaiseEvent Executing(Me, e) End Sub Protected Sub OnExecuted(ByVal e As EventArgs) RaiseEvent Executed(Me, e) End Sub Sub GoExecute() For i As Integer = 1 To 100000000 OnExecuting(New EventArgs) '運行動作，這邊為了看出差異，故不做動作 If EnableLogData Then '紀錄動作，這邊為了看出差異，故不做動作 End If OnExecuted(New EventArgs) Next End Sub End Class

//不影響結果 if(i == a){ Console.WriteLine("Some Thing Error!!"); } } 3.加入一些冗贅的運算 int a = 10;改為 int b = 2; int c = 5; int a = b * c; 值得注意的是，使用混淆保護的程式仍是可以使用反組譯工具看到混淆後的MSIL，且很容易被有心人反推回去的，只是增加了反推的難度而已。微軟自帶的Dotfuscator Community Edition好像已經有現成反推回去的程式在網路上流佈，像水瓶大介紹的DF Stack就是一例。 內核級加密保護若採用內核級加密來保護，使用反組譯工具去看MSIL時。會顯示不是CLR程式，無法看到反組譯過後的程式碼。有比混淆稍微安全些的感覺。類似的軟體有MaxToCode、XeonCode。 硬體保護硬體保護方面，有聖天狗、Aladdin等硬體加密鎖。多半這類產品除了本身會提供API可以讓程式呼叫做保護的動作外，也會附上基本的混淆與程式加密功能。 Conclusion在.NET保護這塊我涉略不深，只能做初步的介紹。這邊我要順帶一提，其實我們用來反組譯的.NET Reflector工具在加密上算是還做的不錯。畢竟本身就是反組譯用的工具，在這方面會有一定的程度，網路上也有許多相關研究。有興趣的可以從該工具的保護機制著手研究。像是Reflector保護方法初探等，還有很多篇，請自行打上關鍵字Reflector 保護，Google一下就有了。 LinkMSDN大內高手專欄 - To De or Not to De? DF Stack 1.0 - .NET 的反混淆器?DF StackReflector保護方法初探

Public Class Form2 … Public MainForm As Form1 … ‘Form2透過Form1傳進的物件參考控制Form1 MainForm.Value = Me.NumericUpDown1.Value … End Class

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