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| Ryan Liu... |
 Posted: Wed Nov 04, 2009 9:17 pm |
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Guest
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Hi,
I look at msdn class lib, it mentions == and != op for Delegate, but does
not mention operators += and -=
My question is: for -=, is that calling Delegate.Remove() or RemoveAll()?
Thanks,
Ryan |
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| Peter Duniho... |
| Posted: Wed Nov 04, 2009 11:01 pm |
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Guest
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Ryan Liu wrote:
Quote: Hi,
I look at msdn class lib, it mentions == and != op for Delegate, but
does not mention operators += and -=
My question is: for -=, is that calling Delegate.Remove() or RemoveAll()?
Hint: what does the following code do when you execute it...
Action action1 = () => Console.WriteLine("called"),
action2 = null;
action2 += action1;
action2 += action1;
action2 -= action1;
action2();
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| Rich P... |
| Posted: Thu Nov 05, 2009 5:20 pm |
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Guest
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Quote: Action action1 = () => Console.WriteLine("called"),
action2 = null;
action2 += action1;
action2 += action1;
action2 -= action1;
action2();
?
Just asking about the lambda notation above. I understand that => is
short hand for an anonymous method. Is this correct? If yes, then what
would the long hand version of the above example look like ? (without
the lambda notation)
Thankds,
Rich
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| Peter Duniho... |
| Posted: Thu Nov 05, 2009 5:42 pm |
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Rich P wrote:
Quote: Action action1 = () => Console.WriteLine("called"),
action2 = null;
action2 += action1;
action2 += action1;
action2 -= action1;
action2();
?
Just asking about the lambda notation above. I understand that => is
short hand for an anonymous method. Is this correct?
Sort of. The => is specifically for writing a lambda expression.
Depending on context, this can either be compiled into an anonymous
method or an actual expression.
So, technically it's not really "short hand" for anything. It simply
"is" a lambda expression. But yes, in a way you can think of it as
short-hand for an anonymous method, because in that context, that's what
it winds up creating.
Quote: If yes, then what
would the long hand version of the above example look like ? (without
the lambda notation)
Action action1 = delegate() { Console.WriteLine("called"); };
As you can see, for this specific usage, there's very little difference.
Pete |
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| Rich P... |
| Posted: Thu Nov 05, 2009 6:25 pm |
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Guest
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so - it looks like => is short hand for a delegate expression /
anonymous method. I haven't quite got the lambda concept down yet. I
will have to keep following posts and examples.
Rich
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