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New Message on BDOTNET
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From: LovedJohnySmith
Message 1 in Discussion
Hi Folks!!
many of our frndz wanna noe ab't this
question, so i would like to answer this questions
Q: any advantages C# would
have over Visual Basic (VB) in terms of the framework?
Answer: Regarding C# vs. Visual
Basic, it really primarily comes down to what you already know and are
comfortable with. It used to be that there was a large perf difference
between VB and C++, but since C# and VB.NET use the same execution engine,
you really should expect the same perf. C# may have a few more "power"
features (such as unsafe code), and VB.NET may be skewed a bit more towards
ease of use (e.g. late bound methods calls), but the differences are very
small compared to what they were in the past.
Q: Okay, can we contrast C# with VB.NET?
Questions usually come in the form of "I know you guys say VB.NET
and C# let you do the same thing, but C# was designed for the CLR, so I
don't believe you when you say VB.NET is just as good."
Answer: Regarding C# versus VB.NET,
the reality is that programmers typically have experience with either C++
or VB, and that makes either C# or VB.NET a natural choice for them. The
already existing experience of a programmer far outweighs the small differences
between the two languages.
Q: Could you discuss the security
of the config files. I have seen a lot of concern that since they are simple
XML files, they can be hacked into easily.
Answer: We do block all access to the
config files from remote users. However, I think the concern people have
is whether a rogue user who gets access to the config file can modify and
take over things. Note that this problem exists with ASP today as well,
in that the metabase APIs can be written to, which would effectively do
the same thing. However, there are some things that you can do to reduce
this problem. Specifically, with ASP.NET we support the ability to "lock
down" settings at a parent directory. For example, you might want
to lock down the security identity of the worker process (i.e.: the username
it runs under) at the machine level and then restrict sub-applications'
abilities to override it.
Q: I've seen a lot of concern that
data can be passed page to page (ASP to and from ASP.NET).
Answer: Since we really use standard
Web techniques, passing info page to page should not be a problem. However,
page to page in ASP and ASP.NET typically assumes services that are provided
by each, such as session and application state. These services are not
shared, and so you can't rely on them. I have a list of things you
can do to ease migration of ASP code to ASP.NET.
1. Use
only a single language within the ASP application. Don't intermix VBScript
and JScript together in the same page (in general a bad programming practice
with ASP, but also a migration issue for ASP.NET in that we now require
only one inline <% %> language.
2. Explicitly
declare all of ASP page functions within a <script language="VBScript"
runat=server> block as opposed to <% %> blocks. In ASP.NET we
no longer support this later function declaration option. It is just a
copy/paste change in order to fix I
3. Explicitly
use VBScript's "Option Explicit" keyword at the top of every
ASP Page (this will become the default with ASP.NET and will also ensure
that you write slightly better code today).
4. Use
the "Call" keyword anytime they call a subroutine in VBScript
today (for example: "Call FooBar (1, 2)"). This will enable/require
them to wrap parenthesis around all subroutine arguments (if you don't
use the "call" keyword, then VBScript today will raise a compilation
error if you have parentheses). In VB.NET, parentheses are now required
(note that the "call" keyword is still supported in VB.NET).
So if they didn't use the "call" keyword, they'd have to go back
and change all subroutines.
5. Avoid
relying on "default properties" in VBScript, and instead fully
qualify property references: (For example, with an ADO Recordset write:
rs("a_name").Value instead of just rs("a_name")). Default
properties are no longer supported in VB.NET.
6. Avoid
using "render function" tricks (a specific unintended hack/trick
that people can use in ASP but which was never intended as a feature).
Instead explicitly use Response. Write blocks when constructing render
functions
Q: Please explain how Long and Short
Weak References work and the usage scenarios for both.
Answer: The differences between long
and short weak references are when the object reference inside the weak
reference gets nulled out.
Q: So if the reference is held after
GC then it is considered long?
Answer: For short references, the contained
reference gets nulled out as soon as the object is deemed unreachable.
This is ultimately more performant because we remove the reference sooner.
Long weak references are nulled after the object has been finalized.
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