Multicast delegate

Question

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

Vulpes · 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

Vineet Kumar Saini · Answer

Thanks all my dear...

James Tomar · Answer

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

Hemant Kumar · Answer

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