clear invokation list

[Guest]

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

 

[Guest]

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.

 

[Jon Skeet [C# MVP]]

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.

 

[Guest]

Thanks for help.

Lubomir

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.