Event Handlers

[Jake K]

Where is the best place to define event handlers? I need to define event
handlers for a COM object referenced in my project and am doing so in the
fowm load. Is this the best place?

[Michael Nemtsev]

Hello Jake,

In asp.net the general place for event handlers is Page_Init, but it's common
for the page controls
In your case you can put defining there.

I don't think that the Page_Load is really the best case, because you need
to check whether it's postbacked or not

JKWhere is the best place to define event handlers? I need to define
JKevent handlers for a COM object referenced in my project and am
JKdoing so in the fowm load. Is this the best place?
JK>
---
WBR,
Michael Nemtseva [C# MVP] :: blog: http://spaces.live.com/laflour

"The greatest danger for most of us is not that our aim is too high and we
miss it, but that it is too low and we reach it" (c) Michelangelo

[Jake K]

Thanks for the reply.

I forgot to mention that I am building a Windows Forms project that will
eventually become a service. Where would the best place be in this case to
define event handlers?

"Michael Nemtsev" <ne*****@msn.co mwrote in message
news:a2******** *************** ****@msnews.mic rosoft.com...

Hello Jake,

In asp.net the general place for event handlers is Page_Init, but it's
common for the page controls
In your case you can put defining there.

I don't think that the Page_Load is really the best case, because you need
to check whether it's postbacked or not

JKWhere is the best place to define event handlers? I need to define
JKevent handlers for a COM object referenced in my project and am
JKdoing so in the fowm load. Is this the best place?
JK---
WBR,
Michael Nemtseva [C# MVP] :: blog: http://spaces.live.com/laflour

"The greatest danger for most of us is not that our aim is too high and we
miss it, but that it is too low and we reach it" (c) Michelangelo

[Dave Sexton]

Hi Jake,

There is no best place. It depends on the scope and lifetime of the object.
If the object is created by a class when the class is created, and if the
object will remain useable for as long as the class that contains it, then
registering event handlers in the class's constructor is usually suitable.
If the object will be useable after the class that contains it has been
disposed then be sure to unregister the event handlers in the class's
dispose method.

If the object is created in some method rather than the class's constructor
then register the event handlers when the object is created in the method.

--
Dave Sexton

"Jake K" <no*****@addres s.comkwrote in message
news:%2******** ********@TK2MSF TNGP06.phx.gbl. ..

Where is the best place to define event handlers? I need to define event
handlers for a COM object referenced in my project and am doing so in the
fowm load. Is this the best place?

[Jake K]

Thanks. The object will only be usable in a single class. I will register
event handlers in the class' constructor. Thanks.

"Dave Sexton" <dave@jwa[remove.this]online.comwrote in message
news:%2******** ********@TK2MSF TNGP06.phx.gbl. ..

Hi Jake,

There is no best place. It depends on the scope and lifetime of the
object. If the object is created by a class when the class is created, and
if the object will remain useable for as long as the class that contains
it, then registering event handlers in the class's constructor is usually
suitable. If the object will be useable after the class that contains it
has been disposed then be sure to unregister the event handlers in the
class's dispose method.

If the object is created in some method rather than the class's
constructor then register the event handlers when the object is created in
the method.

--
Dave Sexton

"Jake K" <no*****@addres s.comkwrote in message
news:%2******** ********@TK2MSF TNGP06.phx.gbl. ..

>Where is the best place to define event handlers? I need to define event
handlers for a COM object referenced in my project and am doing so in the
fowm load. Is this the best place?

[Jake K]

Does it matter where InitializeCompo nent(); appears in the default
constructor? E.g. Is this correct or does InitializeCompo nent need to be
the first line?

namespace whatever
{

public partial class Form1 : Form
{
//fields defined here, etc.
}

public Form1 //default constructor
{
COMObject1 = new COMObjectClass( );
COMObject1.Meth odName += new
COMObjectLib._I COMObjectEvents _MethosNameEven tHandler(OnCOMO bject1MethodNam e);
InitializeCompo nent();
}

private void OnCOMObject1Met hodName()
{
}

}


"Jake K" <no*****@addres s.comkwrote in message
news:u3******** ******@TK2MSFTN GP04.phx.gbl...

Thanks. The object will only be usable in a single class. I will
register event handlers in the class' constructor. Thanks.

"Dave Sexton" <dave@jwa[remove.this]online.comwrote in message
news:%2******** ********@TK2MSF TNGP06.phx.gbl. ..

>Hi Jake,

There is no best place. It depends on the scope and lifetime of the
object. If the object is created by a class when the class is created,
and if the object will remain useable for as long as the class that
contains it, then registering event handlers in the class's constructor
is usually suitable. If the object will be useable after the class that
contains it has been disposed then be sure to unregister the event
handlers in the class's dispose method.

If the object is created in some method rather than the class's
constructor then register the event handlers when the object is created
in the method.

--
Dave Sexton

"Jake K" <no*****@addres s.comkwrote in message
news:%2******* *********@TK2MS FTNGP06.phx.gbl ...

>>Where is the best place to define event handlers? I need to define
event handlers for a COM object referenced in my project and am doing so
in the fowm load. Is this the best place?

[Dave Sexton]

Hi Jake,

In your situation it doesn't matter since COMObjectClass isn't instantiated
and configured by the designer, but you should make it a habit of putting
InitializeCompo nent as the first line anyway since it's not uncommon to
manipulate designer-serialized controls in the constructor.

--
Dave Sexton

"Jake K" <no*****@addres s.comkwrote in message
news:u3******** ******@TK2MSFTN GP03.phx.gbl...

Does it matter where InitializeCompo nent(); appears in the default
constructor? E.g. Is this correct or does InitializeCompo nent need to be
the first line?

namespace whatever
{

public partial class Form1 : Form
{
//fields defined here, etc.
}

public Form1 //default constructor
{
COMObject1 = new COMObjectClass( );
COMObject1.Meth odName += new
COMObjectLib._I COMObjectEvents _MethosNameEven tHandler(OnCOMO bject1MethodNam e);
InitializeCompo nent();
}

private void OnCOMObject1Met hodName()
{
}

}


"Jake K" <no*****@addres s.comkwrote in message
news:u3******** ******@TK2MSFTN GP04.phx.gbl...

>Thanks. The object will only be usable in a single class. I will
register event handlers in the class' constructor. Thanks.

"Dave Sexton" <dave@jwa[remove.this]online.comwrote in message
news:%2******* *********@TK2MS FTNGP06.phx.gbl ...

>>Hi Jake,

There is no best place. It depends on the scope and lifetime of the
object. If the object is created by a class when the class is created,
and if the object will remain useable for as long as the class that
contains it, then registering event handlers in the class's constructor
is usually suitable. If the object will be useable after the class that
contains it has been disposed then be sure to unregister the event
handlers in the class's dispose method.

If the object is created in some method rather than the class's
constructor then register the event handlers when the object is created
in the method.

--
Dave Sexton

"Jake K" <no*****@addres s.comkwrote in message
news:%2****** **********@TK2M SFTNGP06.phx.gb l...
Where is the best place to define event handlers? I need to define
event handlers for a COM object referenced in my project and am doing
so in the fowm load. Is this the best place?