Hi,

I am wondering how I could clear the invokation list of delegates.

I tried the following:

//make a chain
MyDel += SomeDel;

// Clear the chain
Delegate [] tmp = MyDel.GetInvocationList();
Delegate.RemoveAll(MyDel, tmp[0]);

Nothing (not even one delegate) is removed from the list.

What am I missing?

Thanks,
Lubomir

Hi,
delegates are immutable, you cannot change their contents, only create new
instances. The Delegate.RemoveAll method will remove all occurances of the
specified delegate from the provided delegate and return you a new delegate
instance. So in your example you want to be using the return value from the
RemoveAll method.

Thanks
Mark.
--
http://www.markdawson.org


"Lubomir" wrote:

> Hi,
>
> I am wondering how I could clear the invokation list of delegates.
>
> I tried the following:
>
> //make a chain
> MyDel += SomeDel;
>
> // Clear the chain
> Delegate [] tmp = MyDel.GetInvocationList();
> Delegate.RemoveAll(MyDel, tmp[0]);
>
> Nothing (not even one delegate) is removed from the list.
>
> What am I missing?
>
> Thanks,
> Lubomir
>
>
>

Lubomir <(E-Mail Removed)> wrote:
> I am wondering how I could clear the invokation list of delegates.

You can't change an existing delegate - it's immutable.

> I tried the following:
>
> //make a chain
> MyDel += SomeDel;
>
> // Clear the chain
> Delegate [] tmp = MyDel.GetInvocationList();
> Delegate.RemoveAll(MyDel, tmp[0]);
>
> Nothing (not even one delegate) is removed from the list.
>
> What am I missing?

As I say, delegates are immutable - think of them as being like strings
in that respect.

See http://pobox.com/~skeet/csharp/events.html for more details.

--
Jon Skeet - <(E-Mail Removed)>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

Thanks for help.

Lubomir



"Jon Skeet [C# MVP]" wrote:

> Lubomir <(E-Mail Removed)> wrote:
> > I am wondering how I could clear the invokation list of delegates.
>
> You can't change an existing delegate - it's immutable.
>
> > I tried the following:
> >
> > //make a chain
> > MyDel += SomeDel;
> >
> > // Clear the chain
> > Delegate [] tmp = MyDel.GetInvocationList();
> > Delegate.RemoveAll(MyDel, tmp[0]);
> >
> > Nothing (not even one delegate) is removed from the list.
> >
> > What am I missing?
>
> As I say, delegates are immutable - think of them as being like strings
> in that respect.
>
> See http://pobox.com/~skeet/csharp/events.html for more details.
>
> --
> Jon Skeet - <(E-Mail Removed)>
> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
> If replying to the group, please do not mail me too
>