我需要擴展實例的行為，但我無法訪問該實例的原始源代碼。例如：
/* I don't have the source code for this class, only the runtime instance */
Class AB
{
public void execute();
}
在我的代碼中，我會截取每個執行調用，計算一些sutff，然後調用原始執行，類似於
/* This is how I would like to modify the method invokation */
SomeType m_OrgExecute;
{
AB a = new AB();
m_OrgExecute = GetByReflection( a.execute );
a.execute = MyExecute;
}
void MyExecute()
{
System.Console.Writeln( "In MyExecute" );
m_OrgExecute();
}
那可能嗎？
有沒有人有這個問題的解決方案？
看起來您需要裝飾器模式。
class AB
{
public void execute() {...}
}
class FlaviosABDecorator : AB
{
AB decoratoredAB;
public FlaviosABDecorator (AB decorated)
{
this.decoratedAB = decorated;
}
public void execute()
{
FlaviosExecute(); //execute your code first...
decoratedAB.execute();
}
void FlaviosExecute() {...}
}
然後，您必須修改使用 AB 對象的代碼。
//original code
//AB someAB = new AB();
//new code
AB originalAB = new AB();
AB someAB = new FlaviosABDecorotor(originalAB);
/* now the following code "just works" but adds your method call */