Yet another global vars question

Lee

I've been programming with Delphi for the past 4 years or so and while
Delphi does allow globals, I use them very judiciously. I say that I
*do* use them because I think that in some cases they are a good choice.

Now in C# there are no global vars. MSDN and google say that I can use
static classes (err, or static methods in classes) like Type.TypeOf,
etc.

What if I have an object that contains resources for the rest of my
application such as a pre-opened database connection or maybe static
data that makes sense to keep in memory because it's used so often. Is
overriding the constructor of every object in the application the only
(best? Advised?) way of sharing an object accross the application?

Thanks for any clarity..

--
Warm Regards,
Lee

"Upon further investigation it appears that your software is missing
just one thing. It definitely needs more cow bell..."

Mar 4 '06 #1

Subscribe Reply

1322

Jon Skeet [C# MVP]

Lee <lu************ *@yahoo.com> wrote:

I've been programming with Delphi for the past 4 years or so and while
Delphi does allow globals, I use them very judiciously. I say that I
*do* use them because I think that in some cases they are a good choice.

Now in C# there are no global vars. MSDN and google say that I can use
static classes (err, or static methods in classes) like Type.TypeOf,
etc.

What if I have an object that contains resources for the rest of my
application such as a pre-opened database connection or maybe static
data that makes sense to keep in memory because it's used so often. Is
overriding the constructor of every object in the application the only
(best? Advised?) way of sharing an object accross the application?

No, in those cases you can use public static members - preferrably
either constants or properties which can return the data (possibly
having lazily loaded them, etc).

For database connections, however, you should usually just let the
built-in connection pooling do the job for you - open the connection
and close it as early as possible, and the connection pool will keep
the *actual* connection open for you.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

Mar 4 '06 #2

Michael Nemtsev

Hello lee,

For your reason pooling and cache is solutions.
Connections generally keeps in pool.
If u want some object to be in memmory - keep them in cache.
Sharing object accross application depends on this app. it's either on singleton/monostate
object, or horisonted scaled object

l> I've been programming with Delphi for the past 4 years or so and
l> while Delphi does allow globals, I use them very judiciously. I say
l> that I *do* use them because I think that in some cases they are a
l> good choice.
l>
l> Now in C# there are no global vars. MSDN and google say that I can
l> use static classes (err, or static methods in classes) like
l> Type.TypeOf, etc.
l>
l> What if I have an object that contains resources for the rest of my
l> application such as a pre-opened database connection or maybe static
l> data that makes sense to keep in memory because it's used so often.
l> Is overriding the constructor of every object in the application the
l> only (best? Advised?) way of sharing an object accross the
l> application?
l>
l> Thanks for any clarity..
l>
l> "Upon further investigation it appears that your software is missing
l> just one thing. It definitely needs more cow bell..."
l>
---
WBR,
Michael Nemtsev :: blog: http://spaces.msn.com/laflour

"At times one remains faithful to a cause only because its opponents do not
cease to be insipid." (c) Friedrich Nietzsche

Mar 4 '06 #3

Similar topics

3333

how does one access global variables when register_globals is off?

by: lkrubner | last post by:

If I set a variable at the top of my code like this: $name = "Lawrence"; It is now a global variable. If, later on, in a function, I want to do this: function uppercaseName() { global $name;

PHP

11904

Global name "userid" not defined??

by: Sean Berry | last post by:

How do I rectify this? ------vars.py------ #!/usr/local/bin/python def setUserid(value): userid = value def getUserid():

Python

1645

funcs vs vars in global namespace

by: David Rysdam | last post by:

Getting no answer yesterday, I've done some investigation and I obviously don't understand how python namespaces work. Here's a test program: #!/usr/bin/python b = 2 def sumWithGlobal(a): return a + b

Python

2026

Question about Object Oriented + functions/global vars?

by: flamesrock | last post by:

ok, so to my knowledge, object oriented means splitting something into the simplest number of parts and going from there. But the question is- when is it enough? For example I have the following code: #def put_file(file_id, delete=False): # """ Function to put the file on the FTP Server # """ # print " FTP for this file started"

Python

2286

global.asa fires after url parameters?

by: WaterBug | last post by:

When clicking on the following link from an email i.e - http://myserver/myapplication/myprogram.asp?urlvar1=some%20stuff&urlvar2=more%20stuff I get a server 500 error. With that same browser window open, if I click the link from the email again I get the desired page. The results are the same if the url is copied and pasted into the brower but the 'go' must be pressed twice. It appears that the server is trying to resolve the url vars...

ASP / Active Server Pages

2642

Managing global vars between files

by: Kleenex | last post by:

Reason: I am working on an embedded project which has very limited memory (under 512 bytes, 60 or so of which is stack space), which translates into limited stack space. In order to save on stack space, I tried to only use parameters and stack space for things which are truely temporary. Instead of passing a pointer to a data structure which should always be populated with data, I have the data structure declared as a global variable and...

C / C++

8656

Are static variables useful for replacing global variables?

by: CDMAPoster | last post by:

About a year ago there was a thread about the use of global variables in A97: http://groups.google.com/group/comp.databases.ms-access/browse_frm/thread/fedc837a5aeb6157 Best Practices by Kang Su Gatlin, casual mention was made about using static variables as an alternative to using global variables. This caused me to think of the following: '-----Begin module code

Microsoft Access / VBA

1291

cannot declare global vars!

by: Konstantinos Pachopoulos | last post by:

Hi, i had posted earlier for not being able to declare global vars. No i followed the suggestions and created a class, but still the vars do not seem to have a global scope. I have tried pretty much everything. Any advice appreciated... Here: ======================================================== #!/usr/bin/env jython #imports

Python

1756

Sharing global vars with Explorer driving me insane...

by: pcaisse | last post by:

I'm having issues sharing global variables with Explorer. This problem probably has a simple answer (as with most newbie questions). The script.pl file: #!/usr/bin/perl -w use strict; use diagnostics; use sigtrap;

Perl

1442

Re: Can't see variables declared as global in a function

by: Gary Herron | last post by:

Jacob Davis wrote: Yuck, YUCK, YUCK! You are breaking *so* many good-programming-practices, I hardly know where to start. First off: A python global is not what you think. There are *no* program wide globals. There are only module wide globals. Also, the "global isglobal" is absolutely meaningless as anything declared there is a (module level) global by definition.

Python

9590

What is ONU?

by: marktang | last post by:

ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...

General

10223

Problem With Comparison Operator <=> in G++

by: Oralloy | last post by:

Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...

C / C++

10051

Maximizing Business Potential: The Nexus of Website Design and Digital Marketing

by: jinu1996 | last post by:

In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...

Online Marketing

10000

The easy way to turn off automatic updates for Windows 10/11

by: Hystou | last post by:

Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...

Windows Server

9866

Discussion: How does Zigbee compare with other wireless protocols in smart home applications?

by: tracyyun | last post by:

Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...

General

6675

Couldn’t get equations in html when convert word .docx file to html file in C#.

by: conductexam | last post by:

I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...

C# / C Sharp

3968

transfer the data from one system to another through ip address

by: 6302768590 | last post by:

Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system

C# / C Sharp

3571

How to add payments to a PHP MySQL app.

by: muto222 | last post by:

How can i add a mobile payment intergratation into php mysql website.

PHP

2815

Comprehensive Guide to Website Development in Toronto: Expert Insights from BSMN Consultancy

by: bsmnconsultancy | last post by:

In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

General