Calling interface methods from collection

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Hi! I like to know is it bossible to call Interface methods from collection. Let say I have collection of pages and I have implemented IMyPageMethods to each page of collection and now I like to call one of its implemented methods.

C#

public ObservableCollection<page> PageCollection = new ObservableCollection<page>();

// ..add pages with IMyPageMethods..

//call specific page method somewhere in code

PageCollection[SomeIndex].MyInterfaceMethod(); // <-- how to do this? intellisense does not offer my interface methods?
</page></page>

Hope you got idea :)

Cheers!

Edit: fixed typos

Posted 5-Aug-11 0:21am

paleGegg0

Updated 5-Aug-11 0:22am

v2

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BobJanova 5-Aug-11 10:43am

If Page implements IMyPageMethods then you should be able to call it on PageCollection[index], since that will be of type Page. So I don't understand the question.

3 solutions

Solution 3

I can offer your a good robust alternative: my DynamicMethodDispatcher which dispatches a delegate call by key. This is quite powerful and effective approach. You will get full source code and usage samples. Please see my article Dynamic Method Dispatcher[^].

—SA

Posted 5-Aug-11 0:34am

Sergey Alexandrovich Kryukov

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Abhinav S 5-Aug-11 8:13am

Yup. Ny 5.

Sergey Alexandrovich Kryukov 5-Aug-11 8:19am

Thank you, Abhinav. And thank you for looking at the article and your votes.
--SA

Solution 2

You can't 'call' Interface methods since they don't implement anything.
That's why it's called implementing an interface.

If a class Employee implements an Interface IPerson, then Employee will have to implement all the functions defined in IPerson, don't know it it makes sense though.

You should read a little about Interfaces:
http://msdn.microsoft.com/en-us/library/ms173156.aspx[^]

Hope it helps

Posted 5-Aug-11 0:31am

_Zorro_

Comments

Sergey Alexandrovich Kryukov 5-Aug-11 6:40am

You are in principle right of course, but why do you think that OP really meant to "call" non-implemented interface methods? A collection item could store an interface reference which was obtained from the implementing class, so it could be called.

Anyway, I suggested my article DynamicMethodDispatcher as an alternative, please see my solution. Did you see this article before? I think this is really interesting.
--SA

_Zorro_ 5-Aug-11 8:30am

I suppose I didn't got that question right then.
I didn't read your article but I'm printing it right now, it'll be a good lecture for tonight in the subway. Thanks.

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Abhinav S · Accepted Answer · 2011-08-05T00:30:00

Solution 1

You cannot directly.

What you can do is create your own ObservableCollection by implementing your local interface in this customized collection.
You can then use the code you have written above.

Posted 5-Aug-11 0:30am

Abhinav S

Comments

Sergey Alexandrovich Kryukov 5-Aug-11 6:36am

ObservableCollection is a good idea, my 5. I suggested my article DynamicMethodDispatcher as an alternative, please see my solution. Did you see this article before? -- I'm not sure, many people saw it.
--SA

Abhinav S 5-Aug-11 8:14am

Thanks.

No I did not see that article before.