abstract class & interface - C# Discussion Boards

Re: Scan process memory searching for instances of a given type.

kASTRATOR26-Jul-06 23:37

26-Jul-06 23:37

As you advised; I just took a look to see how CLR Profiler manage scanning memory.
It seems he's using a C++ unmanaged library that goes with pointers arithmetics.

I would like to avoid going through pointers; I'd rather find a solution to do it in C#.

Re: Scan process memory searching for instances of a given type.

Ed.Poore26-Jul-06 23:49

Ed.Poore

26-Jul-06 23:49

To be honest I don't think that you'll be able to avoid using pointers, the only way would be to use a wrapper around some stuff that did use pointers Roll eyes | :rolleyes:

Formula 1 - Short for "F1 Racing" - named after the standard "help" key in Windows, it's a sport where participants desperately search through software help files trying to find actual documentation. It's tedious and somewhat cruel, most matches ending in a draw as no participant is able to find anything helpful. - Shog⁹

Ed

Re: Scan process memory searching for instances of a given type.

kASTRATOR27-Jul-06 0:43

kASTRATOR

27-Jul-06 0:43

I'll try to implement an algo similar to GarbageCollector one. With root references and scanning through the tree structure of each root. It won't be as generic as I wanted to. But going through pointers woul be very expensive in time for me.

Re: Scan process memory searching for instances of a given type.

Ed.Poore27-Jul-06 0:48

Ed.Poore

27-Jul-06 0:48

kASTRATOR wrote:
But going through pointers woul be very expensive in time for me.

That's whats most important Smile | :)

Enterprise Library 2.0 Database Listener

osamahmirza26-Jul-06 3:21

osamahmirza

26-Jul-06 3:21

Hello,
I am developing a web app and trying to use Enterprise Library 2.0. I am using it for logging for now. I achived the logging on a flat file but when I tried to start doing the logging by using a DataBase Listener. I failed.

Here's how I am using it after including all possible references to my web app.

I configured a datasource with following attributes setup:

-Server (my server name)
-Database (my database in my server)
-Integrated Security (I used API.. something, false, true and I even tested after removing this tag aswell).
-user (my user name)
-pwd (my password)

Then I configured a Database Listner and gave the reference of my datasource.

Then I configured a Logging block by adding different categories and then I added reference to my Database listner in categories.

I also tested by adding and removing following in web.config within CodeDom tag:

type="Microsoft.CSharp.CSharpCodeProvider,
System, Version=2.0.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089"
compilerOptions="/d:TRACE" />

----------------
After doing this all when I try to log an entry after specifing the category to the entry and other required attributes. NOTHING HAPPENS in tables I generated after running the script file provided by Best Patterns and Practices team. I couldnt log any data.

Is there anybody who can help me or tell me what I am doing wrong?

backups! [modified]

Jaymahinda26-Jul-06 3:17

Jaymahinda

26-Jul-06 3:17

Hi every body!
I need the C# code to back up a database and to restore it including sql code(using sql server). There should be ways to select the back up location and to select the backup file to restore. I'm thankful in advance if somebody can kindly provide me this help....please.

-- modified at 9:17 Wednesday 26th July, 2006

Re: backups!

Ed.Poore26-Jul-06 4:45

Ed.Poore

26-Jul-06 4:45

There are articles all over the web on how to do this. Just fire up Google or Search through the articles on this site.

abstract class & interface

lavate malllik26-Jul-06 1:51

lavate malllik

26-Jul-06 1:51

In which situation we have to use abstract class & interface?

lavate

Re: abstract class & interface

leppie26-Jul-06 1:54

leppie

26-Jul-06 1:54

lavate malllik wrote:
In which situation we have to use abstract class & interface?

It depends on your requirements, some times they can be interchanged, some times they cant.

xacc.ide-0.2.0 preview - Now in 100% C# goodness

Re: abstract class & interface

stancrm26-Jul-06 1:54

stancrm

26-Jul-06 1:54

Probably this can help you:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbcon/html/vbconabstractclassesversusinterfaces.asp
http://www.codeproject.com/csharp/abstractsvsinterfaces.asp

Re: abstract class & interface

J4amieC26-Jul-06 2:47

J4amieC

26-Jul-06 2:47

1) An abstract class is like an interface with some fuctionality predefined (something an interface cannot have).

2) Multiple inheritance of classes is not possible.

3) Multiple implementation of interfaces is possible.

With these 3 bits of information you should be able to answer your own question.

---

How to get answers to your questions[^]

When use static method and when use non static method ?

CooperWu26-Jul-06 1:47

CooperWu

26-Jul-06 1:47

Hi all,
I'm fresh man of OOP. so I want know When use static method and when use non static method ?
Any guidelines for use non static method or static method?

c# code sample:

//static method
class myclass
{
  public myclass() {}

  private int _i= 0;

  public int Value
  {
    get { return _i;}
    set {_i= value; }
  }

  public static int GetDoubleValue(int value)
  {
    return 2 * value;
  }

  // or
  public static int GetDoubleValue(myclass c)
  {
    return 2 * c.Value;
  }
}

//non static method
class myclass
{
  public myclass() {}

  private int _i= 0;

  public int Value
  {
    get { return _i;}
    set {_i= value; }
  }

  public int GetDoubleValue()
  {
    return 2 * this.Value;
  }
}

Re: When use static method and when use non static method ?

Christian Graus26-Jul-06 2:07

Christian Graus

26-Jul-06 2:07

Use static methods where you imagine the method would be called by someone who doesn't have an instance of your class. For example, a method that creates a class instance needs to be static. Often, a method is static because it's the only method a user is likely to call in a given instance, it doesn't require any state ( static objects are not tied to an instance, and so have no state beyond static variables ) and so a static method means they are not forced to create an instance just to call a method.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Re: When use static method and when use non static method ?

CooperWu26-Jul-06 2:30

CooperWu

26-Jul-06 2:30

Hi Christian Graus,
Thanks for your reply.
I know that differents between static method and non static, just be at a loss to when use a static method or non static one.

Christian Graus wrote:
static objects are not tied to an instance

This is best answer about this question. I will spend more time think about it.
do you have any guideline about it?

Thanks again.

Re: When use static method and when use non static method ?

MatthysDT26-Jul-06 2:15

MatthysDT

26-Jul-06 2:15

Here is a great example:
http://www.pp.rhul.ac.uk/~george/PH2150/html/node48.html[^]

The way I understand it, static methods are not object-specific. A static method will always only have one instance, irrespective of what object invokes it.

(Look at the sheep example, old McDonald explains it better than I do)

you can't forget something you never knew...

Re: When use static method and when use non static method ? [modified]

CooperWu26-Jul-06 2:58

CooperWu

26-Jul-06 2:58

hi evilnoodle,
Thanks for your reply. Smile | :)

I have read the article your gave. It's simple but helpful for me.

-- modified at 8:58 Wednesday 26th July, 2006

Re: When use static method and when use non static method ?

MartyExodus26-Jul-06 5:04

MartyExodus

26-Jul-06 5:04

You would want to use static methods when it wouldn't make sense to create an instance fo the class for it.

For example:

<br />
Math myMath = new Math();<br />
myPath.sqrt(3.14);<br />

Wouldn't make sense. You don't want to have to create a Math object just to use the square root function. Instead, you make the square root function a static method of the Math class, so you can just say

Math.sqrt(3.14);

Hope that helps some.

using System.People;

Person me = new Person();

me.Certifications = null;
me.Experience = little;
me.WantsToLearn = true;
me.InSchool = true;

me.AskQuestions("C# .NET 2003");

Re: When use static method and when use non static method ?

CooperWu26-Jul-06 19:31

CooperWu

26-Jul-06 19:31

hi MartyExodus,

MartyExodus wrote:
Hope that helps some.

yeah, It's helpful to me.
more and more answers help me understand when use a static method.
Thanks a lot.

Re: When use static method and when use non static method ?

A.A.26-Jul-06 5:30

A.A.

26-Jul-06 5:30

A good time to 'investigate' using a static method is if no 'instance' state needs to be persisted, read, or changed in the method.

Recitation(not full prayer)in AlMasjid AlHaram
Surah AlHaaqa(The Reality)
Surah Maryam(Mary)
Eid Alfitr
Turning Muslim in Texas?

Re: When use static method and when use non static method ?

CooperWu26-Jul-06 19:36

CooperWu

26-Jul-06 19:36

hi A.A.

A.A. wrote:
no 'instance' state needs to be persisted, read, or changed in the method.

is detailed with

Christian Graus wrote:
static objects are not tied to an instance

Thanks a lot.

Directory.Exists fails on UNC names

paas26-Jul-06 1:24

paas

26-Jul-06 1:24

I am developing a Windows Service under VS 2005. Within the code some shared network directories have to be enumerated but when the code attempts to verify the existence of any one of those directories with code similar to: Directory.Exists("\\somedir\subdir") the function returns false every time apparently because network authentication is not automatically done by Directory.Exists. Can anyone point me in the write direction (e.g. example) of what I must do programatically to ensure the network authentication is in place to allow this command to succeed in a Windows Service when using UNC names?

Thank you...

Re: Directory.Exists fails on UNC names

paas26-Jul-06 3:14

paas

26-Jul-06 3:14

Never mind. Just had to set up the proper service logon.

[Message Deleted]

waheed awan26-Jul-06 1:03

waheed awan

26-Jul-06 1:03

[Message Deleted]

Re: c# compiler

Christian Graus26-Jul-06 1:38