Multicast delegate

Vineet Kumar Saini

14y3.2k.NET

Hi...

I know delegate concept in c# but I want to know meaning of "multicast" in delegate ? Please explain with an example ?

Thanks.....

4 Replies

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Vulpes14y ago
Accepted answer
'Multicast means that a delegate can invoke not just a single method but a list of methods (instance or static). This list is known as the delegate's 'invocation list' and when the delegate is called each method in the list is invoked in order.

All delegates in C# have multicast capability so you don't need to do anything special to have this functionality 'on tap'.

Here's a simple example I recently did in another thread:

http://www.c-sharpcorner.com/Forums/Thread/153505/delegate-in-C-Sharp.aspx
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Vineet Kumar Saini14y ago
Thanks all my dear...
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Nipun Tomar14y ago
Hi,

I think these Articles links are helpful plz read this:

http://www.netsplore.com/PublicPortal/blog.aspx?EntryID=9
http://www.c-sharpcorner.com/UploadFile/ankithakur/Delegates06042007014105AM/Delegates.aspx

Thanks
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Hemant Kumar14y ago
A multicast delegate can be assigned and invoke multiple methods.

You may have seen hints of this in your code. For example, if you are doing ASP.NET development and have ever looked at a page's InitializeComponent() method, you may have noticed a statement like this:

this.SearchButton.Click += new System.EventHandler(this.SearchButton_Click);

Notice the += in that statement. That is a clue. You could add another event handler if you wanted, and it would get called as well. For example, let's say you wanted to also call a method named NotifyStatistics every time the Search button was clicked. Then your code could be:

this.SearchButton.Click += new System.EventHandler(this.SearchButton_Click);
this.SearchButton.Click += new System.EventHandler(this.NotifyStatistics);

Every time the user clicks the Search button, first SearchButton_Click() is called, followed by NotifyStatistics(). The event handlers are called in the order they are added. Likewise, using -=, an event handler can be removed.

Now, you may be asking, why not just add whatever code is in the NotifyStatistics method to the SearchButton_Click method?

http://stackoverflow.com/questions/2192219/simple-delegate-delegate-vs-multicast-delegates
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