Re: How to sort arraylist ? - C# Discussion Boards

4-Apr-07 1:29

C# has nothing to do with it. The program on the other end needs to read HTML mail, and then the images need to be linked to in the email.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

How to sort arraylist ?

Saikek4-Apr-07 0:48

Saikek

4-Apr-07 0:48

Hello!
I have a ArrayList, that contains class (for example):

<br />
class A<br />
  {<br />
    int a<br />
    int b<br />
  public A() <br />
  {<br />
    a=0;<br />
    b=0;<br />
  }<br />
  public A(int Na, int Nb)<br />
  {<br />
    a=Na;<br />
    b=Nb;<br />
  }<br />
}

How to sort this elements in the arraylist ? The sorting field is A.

One nation - underground

rah_sin4-Apr-07 0:57

rah_sin

4-Apr-07 0:57

u can try arraylist's Sort method

rahul

Christian Graus4-Apr-07 1:00

4-Apr-07 1:00

If you're using .NET 2.0, use a List instead and provide a sorting function. I can't recall, but I thought you can do this in 1.1 and 1.0 as well, probably just with lots of casting of objects.

DavidNohejl4-Apr-07 1:57

4-Apr-07 1:57

Christian Graus wrote:
I thought you can do this in 1.1 and 1.0 as well, probably just with lots of casting of objects.

Yup, for sorting operation there must be operators <, >,= defined (or some of them at least), which System.object does not have. Smile | :)

"Throughout human history, we have been dependent on machines to survive. Fate, it seems, is not without a sense of irony. " - Morpheus
"Real men use mspaint for writing code and notepad for designing graphics." - Anna-Jayne Metcalfe

Martin#4-Apr-07 1:09

4-Apr-07 1:09

Hello,

Saikek wrote:
The sorting field is A.

I don't understand this!

Don't you mean you whant to sort your Collection of "A"-class instances, with the value of the "A"-class member "a" (which is an int)?

Martin

DavidNohejl4-Apr-07 1:52

4-Apr-07 1:52

As others said, if you are using .NET 2.0 use generic collection (List<A>). As for sorting, you probably mean sorting by field int 'a'? As you dont expose anything (a,b is private) you could implement IComparable. Or if you can expose sorting field, custom implementation of IComparer that knows how to sort class A (e.g. A.SortByFieldAComparer). Look up appropriate interfaces in MSDN or google.

Martin#4-Apr-07 2:11

4-Apr-07 2:11

Hello,

Just because I'm curious:
Do you know of a equivalent Comparer class to System.Collection.CaseInsensitiveComparer, which comparse int values?
Or is the solution to use "ToString" for comparison.

dnh wrote:
As for sorting, you probably mean sorting by field int 'a'?

I'm happy that it's not only me, who thinks that the question is not valid.

All the best,

Martin

DavidNohejl4-Apr-07 21:44

4-Apr-07 21:44

Hmm, there is only one way how to compare integers (that makes sense) as far as I know. System.Int32 implements IComparable, so no need for comparer.

Martin#4-Apr-07 22:12

4-Apr-07 22:12

Hello dnh,

2 minutes after I posted this yesterday, I hoped you would ignore it. Roll eyes | :rolleyes:

So the .Net 1.1 solution for me would be, use the Sort method of the ArrayList class and give a user specific IComparer instance as parameter.
Userspecific IComparer instance would be something like this:

public class ComparerForIntMemberaInClassA : IComparer  
{
    int System.Collections.IComparer.Compare( object x, object y )
    {
	A firstA = x as A;
	A secondA = y as A;
	return firstA.a.CompareTo(secondA.a);
    }
}

What's your feeling about it?

Thank you for you interest!

All the best,

Martin

DavidNohejl4-Apr-07 23:06

4-Apr-07 23:06

yes, that looks fine. Other solution would be implement IComparable in class A; I don't know the guidelines but to me it feels like for "default" sorting I would implement IComparable in class I want to sort (if it is class I own - if it is e.g .NET framework class then I can't do that) and non standard comparations (e.g case insensitive) would go into custom comparers. If you are sorting by private members, nested class should solve access problem.

Martin#4-Apr-07 23:09

Software live update help needed

4-Apr-07 23:09

Thanks for your statement!
Have a nice day!

All the best,

Martin

pashitech4-Apr-07 0:35

pashitech

4-Apr-07 0:35

hi all,
i've developed a windows application , i wanna add update software feature to it,[i mean my client should be able to update the softawere 1.0.0 to 2.0.0]
can u please tell/suggst me how to/accomplish this

prashanth,
s/w Engineer,
Syfnosys.

Re: Software live update help needed

Christian Graus4-Apr-07 0:54

Re: Software live update help needed [modified]

4-Apr-07 0:54

ClickOnce is part of VS2005 and does this.

pashitech4-Apr-07 1:02

pashitech

4-Apr-07 1:02

hi

i found Clickonce is very good, and tried alot to understand,
see could able to publish and make the new versions,
but my requirement is whenver user opens my applicaions and connected to internet i need to promt him saying u r working with olderversio(1.0 and current version 3.0 is available)
if user clicks ok it should be updated please
help me how to do so
thnx in advance

prashanth,
s/w Engineer,
Syfnosys.

Re: Software live update help needed

Not Active4-Apr-07 3:23

Not Active

4-Apr-07 3:23

You can all of that from the deployment API. http://msdn2.microsoft.com/en-us/library/system.deployment.application(VS.80).aspx[^]

only two letters away from being an asset

How ToExecute DTS using C#.Net Code behind ?[modified]

SrinivasanPrabakaran4-Apr-07 0:35

SrinivasanPrabakaran

4-Apr-07 0:35

Hi,

My name is srinivasan and I am new to this DTS concept.
I have to execute the DTS package from the C#.Net Code behind.
I managed to create a small DTS Package in SQL server and execute it from SQL Server Enterprise Manager.
But I can not execute that Package from C#.Net.
Can any one help?

I’ve written a small Class for Executing the DTS but it's not working.

CLASS: Class1
Function: DtsPackage()
---------------------------------------

public void DtsPackage()
{
try
{
Package2Class Package = new Package2Class();
object pVarPersistStgOfHost = null;

Package.LoadFromSQLServer
("<server name>","<user name>","<password>",DTSSQLServerStorageFlags.DTSSQLStgFlag_UseTrustedConnection,"","","","Test Package",ref pVarPersistStgOfHost);

Package.Execute();
Package.UnInitialize();

System.Runtime.InteropServices.Marshal.ReleaseComObject(Package);
Package = null;
}

--------------------------------------------------
And when I execute this I am getting an error.
__________________________________________________________________
ERROR: Sniff | :^)

Login failed for user '(null)'. Reason: Not associated with a    trusted SQL Server connection.

__________________________________________________________________

What could be the reason?
The 'server name', 'user name' and the 'password' was also correct.

Server name is SQL Server's Name.
User Name is SQL Server's User Name.
Password is SQL Server's Password.

Thank you in advance,
Seenu.

-- modified at 6:41 Wednesday 4th April, 2007

SrinivasanPrabakaran.
Trainee Software Engineer.
Metrica Systems.
Bangalore.

problem.

amaneet4-Apr-07 0:27

amaneet

4-Apr-07 0:27

Sir/Madam,
Can somebody please provide the help with the help of an easy example how to differentiate between
Protected
Internal
Internal protected

Please help.
Thanks and regards
Pankaj Garg

Re: problem.

Christian Graus4-Apr-07 0:38