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.NET Forum / Languages / Managed C++ / October 2005How does one remove Event Handlers?
In general, some controls can have events handlers attached to them, typically via the += operator. How does one remove an event handler added this way? Or, just as good for my purposes, how can one remove all event handlers attached? You could keep an ArrayList of all the delegates you've added to the event and then remove them one by one using the -= operator.  SignatureRegards, Nish [VC++ MVP] > In general, some controls can have events handlers attached to them, > typically via the += operator. How does one remove an event handler added > this way? Or, just as good for my purposes, how can one remove all event > handlers attached? So, if i understand, I'd should do something like this (code inside a class, hence the 'this' reference): EventHandler* handler = new EventHandler( this, m_Handler ) ; // this->m_Handler is of proper form timer->Tick += handler ; and then remove it via: timer->Tick -= handler ; // this 'handler' is the same variable as above Is this correct? > You could keep an ArrayList of all the delegates you've added to the event > and then remove them one by one using the -= operator. [quoted text clipped - 3 lines] >> this way? Or, just as good for my purposes, how can one remove all event >> handlers attached? I guess there is no need to keep an ArrayList of all the delegates you've added. You can use MulticastDelegate::GetInvocationList to get an array of all single cast delegates. Marcus > You could keep an ArrayList of all the delegates you've added to the event > and then remove them one by one using the -= operator. [quoted text clipped - 3 lines] >> this way? Or, just as good for my purposes, how can one remove all event >> handlers attached?
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