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EventHandling problem : Java has solution but what about Microsoft???

Hi,
I have added few of the events in some control, example code is:
btnControl.GotF ocus +=new EventHandler(Ev entHandlingMeth od);
btnControl.Clic k +=new EventHandler(Ev entHandlingMeth od);
lblControl.Clic k +=new EventHandler(Ev entHandlingMeth od);

private void EventHandlingMe thod(object sender, EventArgs e)
{
.......
}

btnControl = Button object, lblControl = Lable object

Now the problem is: I am adding the same event handler method in all events for btnControl and lblControl too.

now in EventHandlingMe thod method, i can find which control is using sender but now if i want to put some switch cases in the method for Event Name then I have no any such information in the eventargs or anyother way....

Can someone help/guide me to get the event name?

Is it possible? if yes then how? If no, then any work around?

Thanks in Advance

Regards,
Mahesh Devjibhai Dhola

Nov 29 '05 #1
21 1344
(some newsgroups trimmed - this really wasn't appropriate for all the
listed groups)

Mahesh Devjibhai Dhola [MVP] wrote:
Hi,
I have added few of the events in some control, example code is:
btnControl.GotF ocus +=new EventHandler(Ev entHandlingMeth od);
btnControl.Clic k +=new EventHandler(Ev entHandlingMeth od);
lblControl.Clic k +=new EventHandler(Ev entHandlingMeth od);

private void EventHandlingMe thod(object sender, EventArgs e)
{
.......
}

btnControl = Button object, lblControl = Lable object

Now the problem is: I am adding the same event handler method in all events for btnControl and lblControl too.

now in EventHandlingMe thod method, i can find which control is using sender but now if i want to put some switch cases in the method for Event Name then I have no any such information in the eventargs or anyother way....

Can someone help/guide me to get the event name?

Is it possible? if yes then how? If no, then any work around?


Your design is bad. Methods should do one thing. If you actually want
the same thing to happen on GotFocus and on Click, fine. If you want
*different* things to happen, use *different* procedures. If there is
some common and some different functionality, put the common
functionality in a separate procedure called from both event handlers.

You shouldn't treat event handlers like a substitute for a Windows
message loop, that has to handle everything that can possible happen.
The GotFocus event handler should do what is required on GotFocus; the
Click event handler should do what is required on Click; and so on.

--
Larry Lard
Replies to group please

Nov 29 '05 #2
"Mahesh Devjibhai Dhola [MVP]" <dh*********@ho tmail.com> schrieb:
I have added few of the events in some control, example code is:
btnControl.GotF ocus +=new EventHandler(Ev entHandlingMeth od);
btnControl.Clic k +=new EventHandler(Ev entHandlingMeth od);
lblControl.Clic k +=new EventHandler(Ev entHandlingMeth od);

private void EventHandlingMe thod(object sender, EventArgs e)
{
.......
}

btnControl = Button object, lblControl = Lable object

Now the problem is: I am adding the same event handler method in all events
for btnControl and lblControl too.

now in EventHandlingMe thod method, i can find which control is using sender
but now if i want to put some switch cases in the method for Event Name then
I have no any such information in the eventargs or anyother way....
=======

I am curious which sense handling different events of different controls in
the same event handler would make. Instead, add separate event handlers for
all event types, not just delegate types. This means separate handlers for
controls' 'Click' and 'GotFocus' events.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

Nov 29 '05 #3
If you need to do different things depending on the event, why not have different event handlers? You can place common code into a method that both event handlers can call.

I understand what you are saying, but it just doesn't seem like a big deal. It is very easy to work around, and most of the time it is not even an issue because you either need different code in the handler anyway, or the events have different signatures, etc.
"Mahesh Devjibhai Dhola [MVP]" <dh*********@ho tmail.com> wrote in message news:uL******** ******@TK2MSFTN GP14.phx.gbl...
Hi,
I have added few of the events in some control, example code is:
btnControl.GotF ocus +=new EventHandler(Ev entHandlingMeth od);
btnControl.Clic k +=new EventHandler(Ev entHandlingMeth od);
lblControl.Clic k +=new EventHandler(Ev entHandlingMeth od);

private void EventHandlingMe thod(object sender, EventArgs e)
{
.......
}

btnControl = Button object, lblControl = Lable object

Now the problem is: I am adding the same event handler method in all events for btnControl and lblControl too.

now in EventHandlingMe thod method, i can find which control is using sender but now if i want to put some switch cases in the method for Event Name then I have no any such information in the eventargs or anyother way....

Can someone help/guide me to get the event name?

Is it possible? if yes then how? If no, then any work around?

Thanks in Advance

Regards,
Mahesh Devjibhai Dhola

Nov 29 '05 #4
Mahesh ,

I agree with what Herfried and Marina have written with regards to different
controls of different types.

The one place where I do find it useful to use a single event handler for
multiple controls is with Button Controls. Take a look at the Button Command
event. You can pass different CommandName and CommandArgument strings for
each button while using the same Button Command event handler.

This works with traditional Button controls as well as Link Buttons and
Image Buttons.

--

Andrew Robinson
www.binaryocean.com
www.bellinghamdotnet.org
"Mahesh Devjibhai Dhola [MVP]" <dh*********@ho tmail.com> wrote in message
news:uL******** ******@TK2MSFTN GP14.phx.gbl...
Hi,
I have added few of the events in some control, example code is:
btnControl.GotF ocus +=new EventHandler(Ev entHandlingMeth od);
btnControl.Clic k +=new EventHandler(Ev entHandlingMeth od);
lblControl.Clic k +=new EventHandler(Ev entHandlingMeth od);
private void EventHandlingMe thod(object sender, EventArgs e)
{
.......
}
btnControl = Button object, lblControl = Lable object
Now the problem is: I am adding the same event handler method in all events
for btnControl and lblControl too.
now in EventHandlingMe thod method, i can find which control is using sender
but now if i want to put some switch cases in the method for Event Name then
I have no any such information in the eventargs or anyother way....
Can someone help/guide me to get the event name?
Is it possible? if yes then how? If no, then any work around?
Thanks in Advance
Regards,
Mahesh Devjibhai Dhola
Nov 29 '05 #5
Dear,
The Microsoft Event handling framework allows me to do this what you suggest
but some time, its possible to have such requirement so its not the matter
of sense but its my need so if you can suggest me the woraround for my
prolme then it will be helpful to me.

"Herfried K. Wagner [MVP]" <hi************ ***@gmx.at> wrote in message
news:%2******** **********@TK2M SFTNGP09.phx.gb l...
"Mahesh Devjibhai Dhola [MVP]" <dh*********@ho tmail.com> schrieb:
I have added few of the events in some control, example code is:
btnControl.GotF ocus +=new EventHandler(Ev entHandlingMeth od);
btnControl.Clic k +=new EventHandler(Ev entHandlingMeth od);
lblControl.Clic k +=new EventHandler(Ev entHandlingMeth od);

private void EventHandlingMe thod(object sender, EventArgs e)
{
.......
}

btnControl = Button object, lblControl = Lable object

Now the problem is: I am adding the same event handler method in all events for btnControl and lblControl too.

now in EventHandlingMe thod method, i can find which control is using sender but now if i want to put some switch cases in the method for Event Name then I have no any such information in the eventargs or anyother way....
=======

I am curious which sense handling different events of different controls in the same event handler would make. Instead, add separate event handlers for all event types, not just delegate types. This means separate handlers for controls' 'Click' and 'GotFocus' events.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

Nov 30 '05 #6
Dear,
Your design is good or bad, it depends on requirement.
I know what is good and bad design for my situation. I am creating my own
framework and thats why i need such help.
This is very simple and general need to have "Event name" in some cases. I
am surprised that all Event has common property and thats Event name and
EventArgs is simply derived from Object class, instead it should have
atleast name property.
So, please dont concentrate on design and if possible, help me to find out
the answer. That is my need and anyhow i want to solve it.

Thanking you all for your kind support.

"Larry Lard" <la*******@hotm ail.com> wrote in message
news:11******** **************@ z14g2000cwz.goo glegroups.com.. .
(some newsgroups trimmed - this really wasn't appropriate for all the
listed groups)

Mahesh Devjibhai Dhola [MVP] wrote:
Hi,
I have added few of the events in some control, example code is:
btnControl.GotF ocus +=new EventHandler(Ev entHandlingMeth od);
btnControl.Clic k +=new EventHandler(Ev entHandlingMeth od);
lblControl.Clic k +=new EventHandler(Ev entHandlingMeth od);

private void EventHandlingMe thod(object sender, EventArgs e)
{
.......
}

btnControl = Button object, lblControl = Lable object

Now the problem is: I am adding the same event handler method in all events for btnControl and lblControl too.
now in EventHandlingMe thod method, i can find which control is using sender but now if i want to put some switch cases in the method for Event
Name then I have no any such information in the eventargs or anyother
way....
Can someone help/guide me to get the event name?

Is it possible? if yes then how? If no, then any work around?


Your design is bad. Methods should do one thing. If you actually want
the same thing to happen on GotFocus and on Click, fine. If you want
*different* things to happen, use *different* procedures. If there is
some common and some different functionality, put the common
functionality in a separate procedure called from both event handlers.

You shouldn't treat event handlers like a substitute for a Windows
message loop, that has to handle everything that can possible happen.
The GotFocus event handler should do what is required on GotFocus; the
Click event handler should do what is required on Click; and so on.

--
Larry Lard
Replies to group please

Nov 30 '05 #7
Dear,
I am creating my own framework and its not centric to Buttton or some
control only. It will be applicable to all the events of all the controls.
So i need one common place which will be a common event handler method for
all and from that method my framework will work ahead by checking the sender
control and event name and i am doing lot other things at event time and i
will need more info than just sender and eventargs so i need to have such
method and switch case for event names.
For the same type of situation, java allows to have event name but i am
wondering why Microsoft has not such a simple provision in EventArgs??

"Andrew Robinson" <ne****@nospam. nospam> wrote in message
news:Oi******** ******@TK2MSFTN GP09.phx.gbl...
Mahesh ,

I agree with what Herfried and Marina have written with regards to different controls of different types.

The one place where I do find it useful to use a single event handler for
multiple controls is with Button Controls. Take a look at the Button Command event. You can pass different CommandName and CommandArgument strings for
each button while using the same Button Command event handler.

This works with traditional Button controls as well as Link Buttons and
Image Buttons.

--

Andrew Robinson
www.binaryocean.com
www.bellinghamdotnet.org
"Mahesh Devjibhai Dhola [MVP]" <dh*********@ho tmail.com> wrote in message
news:uL******** ******@TK2MSFTN GP14.phx.gbl...
Hi,
I have added few of the events in some control, example code is:
btnControl.GotF ocus +=new EventHandler(Ev entHandlingMeth od);
btnControl.Clic k +=new EventHandler(Ev entHandlingMeth od);
lblControl.Clic k +=new EventHandler(Ev entHandlingMeth od);
private void EventHandlingMe thod(object sender, EventArgs e)
{
.......
}
btnControl = Button object, lblControl = Lable object
Now the problem is: I am adding the same event handler method in all events for btnControl and lblControl too.
now in EventHandlingMe thod method, i can find which control is using sender but now if i want to put some switch cases in the method for Event Name then I have no any such information in the eventargs or anyother way....
Can someone help/guide me to get the event name?
Is it possible? if yes then how? If no, then any work around?
Thanks in Advance
Regards,
Mahesh Devjibhai Dhola

Nov 30 '05 #8
"Mahesh Devjibhai Dhola [MVP]" <dh*********@ho tmail.com> schrieb:
The Microsoft Event handling framework allows me to do this what you
suggest
but some time, its possible to have such requirement so its not the matter
of sense but its my need so if you can suggest me the woraround for my
prolme then it will be helpful to me.


No, I can't suggest a workaround, because each workaround would be an ugly
hack I would not want to see getting into production code.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

Nov 30 '05 #9
EventArgs is just the base class for event arguments. You could perhaps
define your own class that would pass the information you need.

I won't discuss this design but it looks like you could also inherits from
those controls and change the On<Event> method ?

--
Patrice

"Mahesh Devjibhai Dhola [MVP]" <dh*********@ho tmail.com> a écrit dans le
message de news:O0******** *****@TK2MSFTNG P10.phx.gbl...
Dear,
I am creating my own framework and its not centric to Buttton or some
control only. It will be applicable to all the events of all the controls.
So i need one common place which will be a common event handler method for
all and from that method my framework will work ahead by checking the sender control and event name and i am doing lot other things at event time and i
will need more info than just sender and eventargs so i need to have such
method and switch case for event names.
For the same type of situation, java allows to have event name but i am
wondering why Microsoft has not such a simple provision in EventArgs??

"Andrew Robinson" <ne****@nospam. nospam> wrote in message
news:Oi******** ******@TK2MSFTN GP09.phx.gbl...
Mahesh ,

I agree with what Herfried and Marina have written with regards to

different
controls of different types.

The one place where I do find it useful to use a single event handler for multiple controls is with Button Controls. Take a look at the Button

Command
event. You can pass different CommandName and CommandArgument strings for each button while using the same Button Command event handler.

This works with traditional Button controls as well as Link Buttons and
Image Buttons.

--

Andrew Robinson
www.binaryocean.com
www.bellinghamdotnet.org
"Mahesh Devjibhai Dhola [MVP]" <dh*********@ho tmail.com> wrote in message news:uL******** ******@TK2MSFTN GP14.phx.gbl...
Hi,
I have added few of the events in some control, example code is:
btnControl.GotF ocus +=new EventHandler(Ev entHandlingMeth od);
btnControl.Clic k +=new EventHandler(Ev entHandlingMeth od);
lblControl.Clic k +=new EventHandler(Ev entHandlingMeth od);
private void EventHandlingMe thod(object sender, EventArgs e)
{
.......
}
btnControl = Button object, lblControl = Lable object
Now the problem is: I am adding the same event handler method in all

events
for btnControl and lblControl too.
now in EventHandlingMe thod method, i can find which control is using

sender
but now if i want to put some switch cases in the method for Event Name

then
I have no any such information in the eventargs or anyother way....
Can someone help/guide me to get the event name?
Is it possible? if yes then how? If no, then any work around?
Thanks in Advance
Regards,
Mahesh Devjibhai Dhola


Nov 30 '05 #10

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