I am using Visual Studio 2K3 writing a ASP.NET web application. Is there a
way to force the C# compiler to catch possible exception?
In Java, all exceptions thrown MUST BE caught, otherwise compiler would give
you error. In C#, is there a way to do that?
16  1292 
now you know why I don't use Java.
No, C# will not FORCE you to catch your errors. That's up to you to do, and
it makes sense. You don't always want to catch every error locally. While
it is good practice, it should not be an absolute requirement.
--- Nick
"ChInKPoInt [No MCSD]" <Ch************ *******@gmail.c om> wrote in message
news:G5******** ************@ro gers.com... I am using Visual Studio 2K3 writing a ASP.NET web application. Is there
a way to force the C# compiler to catch possible exception?
In Java, all exceptions thrown MUST BE caught, otherwise compiler would
give you error. In C#, is there a way to do that?
Nick Malik <ni*******@hotm ail.nospam.com> wrote: now you know why I don't use Java.
No, C# will not FORCE you to catch your errors. That's up to you to do, and
it makes sense. You don't always want to catch every error locally. While
it is good practice, it should not be an absolute requirement.
It's not in Java. You don't have to catch every exception (or even
checked exception) locally - you just have to declare which checked
exceptions you can throw.
I believe that checked exceptions of some kind are a good idea; I'm not
sure that Java got it right, and C#/.NET didn't get it right by getting
rid of them entirely. Java feels slightly cumbersome because of them,
and C# sometimes feels like driving without a seatbelt due to the lack
of them. The first language/platform which gets exception handling
really "right" will be interesting...
--
Jon Skeet - <sk***@pobox.co m> http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
"Richard Blewett [DevelopMentor]" <ri******@NOSPA Mdevelop.com> wrote in
message news:uG******** ******@TK2MSFTN GP10.phx.gbl... Nope C# doesn't support checked exceptions. Heres a transcript of Bruce
Eckle and Anders Hejlsberg discussing why they are not in C#.
http://www.artima.com/intv/handcuffs.html
I find the "versioning " argument here weak, for two reasons:
The implication is that a method
void M() throws A, B, C
throws precisely A, B and C, and that this handcuffs you in reimplementing
the method. In fact, the method can be changed to throw any subclass of A,
B or C without breaking compatibility. If you're designing a method that
has to remain compatible (one in a widely used library, like the .NET
Framework) A, B and C should be categories of exception like IOException,
not the specific IO exceptions that can be thrown in the first
implementation.
One advantage of checked exceptions is that it allows the documentation to
know which exceptions are thrown. Compare the JDK Javadoc with the .NET API
documentation. You'll see how much better the Javadoc is about showing
which exceptions are thrown and why.
"Mike Schilling" <ms************ *@hotmail.com> wrote in message
news:eZ******** ******@TK2MSFTN GP15.phx.gbl...
"Richard Blewett [DevelopMentor]" <ri******@NOSPA Mdevelop.com> wrote in
message news:uG******** ******@TK2MSFTN GP10.phx.gbl... Nope C# doesn't support checked exceptions. Heres a transcript of Bruce
Eckle and Anders Hejlsberg discussing why they are not in C#.
http://www.artima.com/intv/handcuffs.html
I find the "versioning " argument here weak, for two reasons:
The implication is that a method
void M() throws A, B, C
throws precisely A, B and C, and that this handcuffs you in reimplementing
the method. In fact, the method can be changed to throw any subclass of
A, B or C without breaking compatibility. If you're designing a method
that has to remain compatible (one in a widely used library, like the .NET
Framework) A, B and C should be categories of exception like IOException,
not the specific IO exceptions that can be thrown in the first
implementation.
How much does it really help you to know that the method throws some kind of
IOException without telling you which ones?
Also, for versioning, consider the case where a method had previously been
written to handle FileStream I/O and therefore had a throws IOException but
now wants to be able to get data from a network as well. The FileStream
parameter is changed to Stream, and the throws clause is changed to include
NetworkExceptio n, and you've got a versioning problem.
One advantage of checked exceptions is that it allows the documentation to
know which exceptions are thrown. Compare the JDK Javadoc with the .NET
API documentation. You'll see how much better the Javadoc is about
showing which exceptions are thrown and why.
Should ease of automatic documentation be a reason to implement a language
feature like this? An <exception> tag in Xml comments in C# solves this
problem without constraining the language.
John Saunders I believe that checked exceptions of some kind are a good idea; I'm not
sure that Java got it right, and C#/.NET didn't get it right by getting
rid of them entirely. Java feels slightly cumbersome because of them,
and C# sometimes feels like driving without a seatbelt due to the lack
of them. The first language/platform which gets exception handling
really "right" will be interesting...
Yet...somehow I think you'll still find a large percentage of people who
like the java or C# way...
I wonder what right is.
"John Saunders" <johnwsaundersi ii at hotmail.com> wrote in message
news:uY******** ******@TK2MSFTN GP14.phx.gbl... "Mike Schilling" <ms************ *@hotmail.com> wrote in message
news:eZ******** ******@TK2MSFTN GP15.phx.gbl...
"Richard Blewett [DevelopMentor]" <ri******@NOSPA Mdevelop.com> wrote in
message news:uG******** ******@TK2MSFTN GP10.phx.gbl... Nope C# doesn't support checked exceptions. Heres a transcript of Bruce
Eckle and Anders Hejlsberg discussing why they are not in C#.
http://www.artima.com/intv/handcuffs.html
I find the "versioning " argument here weak, for two reasons:
The implication is that a method
void M() throws A, B, C
throws precisely A, B and C, and that this handcuffs you in
reimplementing the method. In fact, the method can be changed to throw
any subclass of A, B or C without breaking compatibility. If you're
designing a method that has to remain compatible (one in a widely used
library, like the .NET Framework) A, B and C should be categories of
exception like IOException, not the specific IO exceptions that can be
thrown in the first implementation.
How much does it really help you to know that the method throws some kind
of IOException without telling you which ones?
Quite a bit.
public void close() throw IOException;
Java reminds you that a close does I/O that can fail (in particular buffer
flushing.) C# doesn't. Any guesses how much C# code handles failures in
Close() ?
Also, for versioning, consider the case where a method had previously been
written to handle FileStream I/O and therefore had a throws IOException
but now wants to be able to get data from a network as well. The
FileStream parameter is changed to Stream, and the throws clause is
changed to include NetworkExceptio n, and you've got a versioning problem.
Not when Network exception is a subclass of IOException, which logically it
will be.
One advantage of checked exceptions is that it allows the documentation
to know which exceptions are thrown. Compare the JDK Javadoc with the
.NET API documentation. You'll see how much better the Javadoc is about
showing which exceptions are thrown and why.
Should ease of automatic documentation be a reason to implement a language
feature like this? An <exception> tag in Xml comments in C# solves this
problem without constraining the language.
But the exception tags don't get put in C# methods, they do get put into the
Java ones.
"Mike Schilling" <ms************ *@hotmail.com> wrote in message
news:eL******** ******@tk2msftn gp13.phx.gbl...
"John Saunders" <johnwsaundersi ii at hotmail.com> wrote in message
news:uY******** ******@TK2MSFTN GP14.phx.gbl... "Mike Schilling" <ms************ *@hotmail.com> wrote in message
news:eZ******** ******@TK2MSFTN GP15.phx.gbl...
"Richard Blewett [DevelopMentor]" <ri******@NOSPA Mdevelop.com> wrote in
message news:uG******** ******@TK2MSFTN GP10.phx.gbl...
Nope C# doesn't support checked exceptions. Heres a transcript of Bruce
Eckle and Anders Hejlsberg discussing why they are not in C#.
http://www.artima.com/intv/handcuffs.html
I find the "versioning " argument here weak, for two reasons:
The implication is that a method
void M() throws A, B, C
throws precisely A, B and C, and that this handcuffs you in
reimplementing the method. In fact, the method can be changed to throw
any subclass of A, B or C without breaking compatibility. If you're
designing a method that has to remain compatible (one in a widely used
library, like the .NET Framework) A, B and C should be categories of
exception like IOException, not the specific IO exceptions that can be
thrown in the first implementation.
How much does it really help you to know that the method throws some kind
of IOException without telling you which ones?
Quite a bit.
public void close() throw IOException;
Java reminds you that a close does I/O that can fail (in particular buffer
flushing.) C# doesn't. Any guesses how much C# code handles failures in
Close() ?
All of mine does. ;-)
Look, _anything_ can fail. It does you little good to know that Close() can
throw IOException. How much does that help you over "throws Exception"?
Also, for versioning, consider the case where a method had previously
been written to handle FileStream I/O and therefore had a throws
IOException but now wants to be able to get data from a network as well.
The FileStream parameter is changed to Stream, and the throws clause is
changed to include NetworkExceptio n, and you've got a versioning problem.
Not when Network exception is a subclass of IOException, which logically
it will be.
Why? It isn't in .NET. Don't know about the Java case. If network exceptions
are subclasses of IOException, then tell me what is _not_ a subclass of
IOException (aside from Exception). One advantage of checked exceptions is that it allows the documentation
to know which exceptions are thrown. Compare the JDK Javadoc with the
.NET API documentation. You'll see how much better the Javadoc is about
showing which exceptions are thrown and why.
Should ease of automatic documentation be a reason to implement a
language feature like this? An <exception> tag in Xml comments in C#
solves this problem without constraining the language.
But the exception tags don't get put in C# methods, they do get put into
the Java ones.
The exception tags get put in by developers who want to document what
exceptions are thrown, and it didn't take a language feature to get that
done. And they're likely to be a lot more specific that "IOExceptio n".
John Saunders
"John Saunders" <johnwsaundersi ii at hotmail.com> wrote in message
news:eE******** ******@TK2MSFTN GP14.phx.gbl... Java reminds you that a close does I/O that can fail (in particular
buffer flushing.) C# doesn't. Any guesses how much C# code handles
failures in Close() ?
All of mine does. ;-)
Good for you. Mine too. A lot doesn't, just in as C, a lot didn't check
the return status from close() or fclose().
Why? It isn't in .NET. Don't know about the Java case. If network
exceptions are subclasses of IOException, then tell me what is _not_ a
subclass of IOException (aside from Exception).
Illegal argument?
Invalid state?
Concurrent modification?
No such class/method/field?
Access not allowed?
etc.
One advantage of checked exceptions is that it allows the documentation
to know which exceptions are thrown. Compare the JDK Javadoc with the
.NET API documentation. You'll see how much better the Javadoc is
about showing which exceptions are thrown and why.
Should ease of automatic documentation be a reason to implement a
language feature like this? An <exception> tag in Xml comments in C#
solves this problem without constraining the language.
But the exception tags don't get put in C# methods, they do get put into
the Java ones.
The exception tags get put in by developers who want to document what
exceptions are thrown, and it didn't take a language feature to get that
done. And they're likely to be a lot more specific that "IOExceptio n".
Then why is the .NET framework documentation so poor in documenting
exceptions compared to the JDK docs? This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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hi,
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I am using Visual Studio 2K3 writing a ASP.NET web application. Is there a
way to force the C# compiler to catch possible exception?
In Java, all exceptions thrown MUST BE caught, otherwise compiler would give
you error. In C#, is there a way to do that?
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Just wondering whether there's any reason why exception specifications are
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Cheers,
Stu
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