adding an event handler

Question

Can someone tell me if or what the difference of the following statements is:

MyObject.MyEvent += new EventHandler(MyEventHandlerMethod);
vs.
MyObject.MyEvent += MyEventHandlerMethod;

whenever I press += the first choice pops up when I click tab so I've always left it. but I'm wondering if I can just write the second. I'm guessing that they both get compiled the same, but I'm curious if that's true. I'm pretty sure I could just look at the IL, but I'm too lazy for that :),I'd rather just ask.

possible duplicate of C# Event handlers

nawfal
– nawfal

2014-07-06 20:24:49 +00:00
Commented Jul 6, 2014 at 20:24 — nawfal
– nawfal, Commented Jul 6, 2014 at 20:24

Konrad Rudolph · Accepted Answer · 2011-04-22 14:13:53Z

7

The first variant was necessary in the first C# compiler. Subsequent versions don’t require it – the second is strictly equivalent to the first, and the compiler will supply the constructor call.

Since the second variant is shorter, removes unnecessary redundancy and has no disadvantages, I advise using it, instead of the explicit version. On the other hand, the IDE unfortunately only offers smart code completion for the first version, so you may want to just go with it.

answered Apr 22, 2011 at 14:13

Konrad Rudolph

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2 Comments

Priyank Over a year ago

Not Exactly. See my answer. Both compiles to the same thing as just SomeEvent += NamedMethod. But if you plan to remove that event handler later, you really should save the delegate.

Konrad Rudolph Over a year ago

@Priyank No, there’s no need for that. -= works fine with either form, too.

TheHolyTerrah · Accepted Answer · 2011-04-22 14:18:12Z

2

They're the same. The first statement is inferred by the second and handled for you in the plumbing.

answered Apr 22, 2011 at 14:18

TheHolyTerrah

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Comments

Bala R · Accepted Answer · 2011-04-22 14:13:34Z

1

They are Identical. There is no difference. The second form is essentially a shorthand for the first and they will produce identical IL.

answered Apr 22, 2011 at 14:13

Bala R

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Comments

Community · Accepted Answer · 2017-05-23 12:03:12Z

0

So the conclusion of this is, writing SomeEvent += new EventHandler(NamedMethod) compiles to the same thing as just SomeEvent += NamedMethod. But if you plan to remove that event handler later, you really should save the delegate.

Ref: += new EventHandler(Method) vs += Method

Difference between ‘ += new EventHandler’ and ‘ -= new EventHandler(anEvent)’

edited May 23, 2017 at 12:03

CommunityBot

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answered Apr 22, 2011 at 14:16

Priyank

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3 Comments

Jose Over a year ago

Your point is taken on this, but I agree with other answers in the first post that saving the delegate is a micro-optimization that in most situations is unnecessary

Jose Over a year ago

I didn't down vote you, nor do i see a reason for a down vote

Konrad Rudolph Over a year ago

“But if you plan to remove that event handler later, you really should save the delegate.” – no, why?

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