Farvardin 18, 1393 AP
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it is a very easy and simple tool to remove all possible viruses. the antivirus software that is currently available for the 64-bit Windows operating system.Q:
Programmatically remove/add C# event handler
I have a question. Let's say I have a class with an event:
public class ClassWithEvent
{
public event EventHandler TestEvent;
}
Now let's say I have some method that needs to have it's own event handler added and removed:
void Method()
{
// Add event handler.
ClassWithEventClass.TestEvent += TestHandler;
// Remove event handler.
ClassWithEventClass.TestEvent -= TestHandler;
}
I know I could do this:
void Method()
{
ClassWithEventClass.TestEvent += TestHandler;
}
void Method()
{
ClassWithEventClass.TestEvent -= TestHandler;
}
But I feel like this has redundant code. Is there a way to add and remove the event handler in one method?
I'm not sure if this is possible, but is there some way that if you call someMethod() and it doesn't add/remove the event handler, it throws an exception?
A:
Not if the event is designed as your question illustrates.
To add and remove an event, it has to be a normal method, with one argument.
public void Attach(EventHandler del)
{
foreach (EventHandler add in this)
{
if (add == del) return;
}
this.TestEvent += del;
}
public void Remove(EventHandler del)
{
foreach (EventHandler add in this)
{
if (add == del) return;
}
this.TestEvent -= del;
}
As you can see, it is not possible for a method to both add an event handler and remove the same event ac619d1d87
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