i have this event handler
Temp.MouseLeftButtonDown += new MouseButtonEventHandler(Temp_MouseLeftButtonDown);
but i wanna send some parameter to access in the Temp_MouseLeftButtonDown function. how can i assign it ??
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27answers:
1
+3
A:
You can't do it directly, because the event handler can only expect a compatible signature with MouseButtonEventHandler.
If you're using C# 3, the easiest approach would be to use a lambda expression - something like:
Temp.MouseLeftButtonDown +=
(sender, args) => Temp_MouseLeftButtonDown(sender, args, "extra argument");
Does that help? Of course, if you don't need both the sender and event args, you don't have to supply them.
In C# 2 you could use an anonymous method in the same way.
Jon Skeet
2010-06-08 09:17:11
+1 great to know this, was wondering myself....
VoodooChild
2010-06-08 09:20:13
Could someone says few good reason for wanting to have extra args in the hadler? please and thank you!!!
VoodooChild
2010-06-08 09:24:12
@VoodooChild: You may want to use most of the same logic in different places, but with some variations.
Jon Skeet
2010-06-08 09:35:02
@Jon: Thanx it worked like charm (Y)@VoodooChild: my case is creating buttons in runtime and each button has a different value i wanna handle that's why i wanted to pass this value with each method for each button.Just a comment i was getting an error when tried to pass the value using my loop i value but it worked fine when i put the value in a variable then passed this variable example: double value = Positions[i].AdPosition;Temp.MouseLeftButtonDown += (sender, args) => TempBreak_MouseLeftButtonDown(value);
Miroo
2010-06-08 09:55:12