Events, add a method when event raised

Question

1.00/5 (1 vote)

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C#

public delegate void myDelecate();
class A
    {
        public event myDelecate myEvent;
    public void everaise()
        {
        if(myEvent!=null)
                myEvent();
        }
     }
class Program
    {
        static void Main(string[] args)
        {
        A obj = new A();
            obj.myEvent += new myDelecate(DEF);
            obj.everaise();
    Console.ReadLine();
        }

        public static void DEF()
        {
            Console.WriteLine("DEF method called");
        }
}

how to make these codes into a single line of code,
obj.myEvent += new myDelecate(DEF);
obj.everaise();

Posted 8-Oct-15 21:28pm

MVK_VIJI

Updated 8-Oct-15 23:47pm

v5

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Comments

Tomas Takac 9-Oct-15 3:37am

Not clear. Are you asking about what happens if you do this at the same time from two threads?

MVK_VIJI 9-Oct-15 4:24am

if u understand now please answer me, use only events and delegates

Tomas Takac 9-Oct-15 4:46am

No, I don't understand. And your other comment didn't help either.

Tomas Takac 9-Oct-15 5:13am

I read you updated question and I'm still not sure what are you asking. But it sounds like you found your solution.

MVK_VIJI 9-Oct-15 5:21am

ok just run the above program you got a output.
are you understand the above program , how it should run and work

MVK_VIJI 9-Oct-15 5:24am

if you understand,
note : obj.myEvent += new myDelecate(DEF);
obj.everaise();
this two lines,,,,,,,,,,,, i need to compress these lines into a single line and output doesn't change,
if you dont understand please leave the question, thanks tomas

Tomas Takac 9-Oct-15 5:57am

Does it need to be an event? I mean, you can have a private member for the delegate and then call a method obj.SetDelegate(new myDelecate(DEF)); and there you set the private member and also call the delegate itself.

Tomas Takac 9-Oct-15 6:01am

BTW it's not wise of you to ask me leave. As you can see nobody so far was able to understand your question. So the problem is not on our side most probably. My point is, you should improve your question if you wanna get an answer at all. Because right now it's on a fast track to be closed.

Leo Chapiro 9-Oct-15 4:33am

Marked as "unclear"

MVK_VIJI 9-Oct-15 4:42am

object.Added += Description();

Here,
Added => method1
Description => method2
If i call the method1 (like object.Added => this is an event), at the same time method2(this is eventhandler) also run
how can i do it

OriginalGriff 9-Oct-15 4:41am

This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind.
I think you are trying to type as little as possible, and that doesn't work as we have no idea of the context behind your question. Try explaining in much more detail exactly what "eventRaise" does, and what your problem is, because at the moment it's not clear at all.
Use the "Improve question" widget to edit your question and provide better information.

phil.o 9-Oct-15 5:44am

There is no question.

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Tomas Takac · Answer 1 · 2015-10-09T00:08:00

You can have custom add/remove handlers for an event:

C#

class A
{
    private myDelecate del;
    public event myDelecate myEvent
    {
        add
        {
            del += value; // add handler
            value(); // call the method being added
            //del(); // call all the methods added so far
        }
        remove
        {
            del -= value;
        }
    }
}

And you don't need to call the public method to raise the event:

C#

void Main()
{
    A obj = new A();
    obj.myEvent += new myDelecate(DEF);
    //obj.everaise();
}

Please note that this will only invoke the delegate being added. Your original solution invoked all the delegates that were added to the event.