Making your own exception?

[Jarod_24]

Throw new Excption ("bla, bla, bla")
....
Catch E as Exception
If E.Message.Equal s("bla, bla, bla") Then ...
Mostly i just use the standard "Exception"-object whenever i throw an
exception, but it would be nice sometimes to make you own
"MyExceptio n"-object that you
can then easier Catch. using:

Catch Exp as MyException
....

Whenever i use the standard exception-object i check to see if the E.Message
equals the one i made, but since this isn't a very good way of coding, so
how do i make my own Exception-object. Do i need to make a new class that
inherits/implements from the Exception.class , or is there a way to do it
without starting making a exception-class for each object you want a
specialized exception for. Someting you do when you trow the exception for
example?

[Armin Zingler]

"Jarod_24" <ja******@hotma il.com> schrieb

Throw new Excption ("bla, bla, bla")
...
Catch E as Exception
If E.Message.Equal s("bla, bla, bla") Then ...
Mostly i just use the standard "Exception"-object whenever i throw
an exception, but it would be nice sometimes to make you own
"MyExceptio n"-object that you
can then easier Catch. using:

Catch Exp as MyException
...

Whenever i use the standard exception-object i check to see if the
E.Message equals the one i made, but since this isn't a very good way
of coding, so how do i make my own Exception-object. Do i need to
make a new class that inherits/implements from the Exception.class ,
or is there a way to do it without starting making a exception-class
for each object you want a specialized exception for. Someting you do
when you trow the exception for example?

Has been discussed here in the past days. See subject "Error handling -
custom 'throw?'"
--
Armin

http://www.plig.net/nnq/nquote.html
http://www.netmeister.org/news/learn2quote.html

[Herfried K. Wagner [MVP]]

* "Jarod_24" <ja******@hotma il.com> scripsit:

Throw new Excption ("bla, bla, bla")
...
Catch E as Exception
If E.Message.Equal s("bla, bla, bla") Then ...
Mostly i just use the standard "Exception"-object whenever i throw an
exception, but it would be nice sometimes to make you own
"MyExceptio n"-object that you
can then easier Catch. using:

Catch Exp as MyException
...

Whenever i use the standard exception-object i check to see if the E.Message
equals the one i made, but since this isn't a very good way of coding, so
how do i make my own Exception-object. Do i need to make a new class that
inherits/implements from the Exception.class , or is there a way to do it
without starting making a exception-class for each object you want a
specialized exception for. Someting you do when you trow the exception for
example?

This depends on various aspects:

* If there is already an appropriate exception class defined in the
.NET Framework, I would use this class instead of creating a new
class.

* If there is no class available in the .NET Framework, I would create
a custom exception class in order to make it easier to handle the
exceptions of a certain type.

Notice that it doesn't make sense to create a new exception class for
each exception -- sometimes it's better to use the same exception class,
for example, 'IOException'.

--
Herfried K. Wagner [MVP]
<http://www.mvps.org/dotnet>

[Jay B. Harlow [MVP - Outlook]]

Jarod,
In addition to the other comments.

These are the guidelines that I try to follow:

http://msdn.microsoft.com/library/de...Guidelines.asp

The following article provides a good template for defining well-tempered
exceptions:

http://msdn.microsoft.com/library/de...rp08162001.asp

Although the code is in C# it should be easily converted to VB.NET.

Catch E as Exception
If E.Message.Equal s("bla, bla, bla") Then ... Did you know you can use a When clause here?

Try
Catch ex As Exception When ex.Message.Equa ls("bla, bla, bla")
Catch ex As Exception When ex.Message.Equa ls("alb, alb, alb")
End Try

Hope this helps
Jay

"Jarod_24" <ja******@hotma il.com> wrote in message
news:5d******** *************** *******@news.te ranews.com... Throw new Excption ("bla, bla, bla")
...
Catch E as Exception
If E.Message.Equal s("bla, bla, bla") Then ...
Mostly i just use the standard "Exception"-object whenever i throw an
exception, but it would be nice sometimes to make you own
"MyExceptio n"-object that you
can then easier Catch. using:

Catch Exp as MyException
...

Whenever i use the standard exception-object i check to see if the E.Message equals the one i made, but since this isn't a very good way of coding, so
how do i make my own Exception-object. Do i need to make a new class that
inherits/implements from the Exception.class , or is there a way to do it
without starting making a exception-class for each object you want a
specialized exception for. Someting you do when you trow the exception for
example?