473,837 Members | 1,474 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Help: ArrayList, Sort, Menu, IComparer, Object, multidemensiona l

Re: ArrayList, Sort, Menu, IComparer, Object, multidemensiona l

I have a multi-dimensional arraylist, and I would like to sort one
level of it but not all. The multi-dimensional arraylist represents my
menu system, and I would like to sort the third level menu items only
and not the first two.

So, I've been trying to use some of the suggestions I've found here
about sorting. Mainly, I've created a comparison interface.

public class DiscountIDCompa rer : IComparer
{
public int Compare (object x, object y)
{
return string.CompareO rdinal((string) x, (string)y);
}

}

And I've been calling this by capturing the 3rd level of menus and
trying to implement the sort:

ArrayList menus = [loads here];
int i =0;
foreach(Menu menu in menus)
{
if (i == 2)
{
// I only want to sort the 3rd level menu items
IComparer foo = new DiscountIDCompa rer();
menu.Items.Sort (foo);
}
i++;
}

So, the problem is that what reaches the comparison interface is an
object and I cannot extract the 'text' from them to compare. Does any
of this make sense, or am I'm missing something. I feel that if I
could capture the text from the menu items that are passes through the
comparison interface then it would be ok, but alas I cannot seem to
find that. Any suggestions would be greatly appreciated.

Thank you.

Nov 3 '06 #1
3 2385

jt*****@eudoram ail.com wrote:
Re: ArrayList, Sort, Menu, IComparer, Object, multidemensiona l

I have a multi-dimensional arraylist, and I would like to sort one
level of it but not all. The multi-dimensional arraylist represents my
menu system, and I would like to sort the third level menu items only
and not the first two.

So, I've been trying to use some of the suggestions I've found here
about sorting. Mainly, I've created a comparison interface.

public class DiscountIDCompa rer : IComparer
{
public int Compare (object x, object y)
{
return string.CompareO rdinal((string) x, (string)y);
}

}

And I've been calling this by capturing the 3rd level of menus and
trying to implement the sort:

ArrayList menus = [loads here];
int i =0;
foreach(Menu menu in menus)
{
if (i == 2)
{
// I only want to sort the 3rd level menu items
IComparer foo = new DiscountIDCompa rer();
menu.Items.Sort (foo);
}
i++;
}

So, the problem is that what reaches the comparison interface is an
object and I cannot extract the 'text' from them to compare. Does any
of this make sense, or am I'm missing something. I feel that if I
could capture the text from the menu items that are passes through the
comparison interface then it would be ok, but alas I cannot seem to
find that. Any suggestions would be greatly appreciated.
There are some critical pieces of information missing, here, but I'll
try filling in the blanks and you can adapt the results to your
situation.

Let's say that the Menu.Items property returns an ArrayList of objects
of type MenuItem. That is, you could say something like

foreach (MenuItem item in menu.Items) { ... }

Furthermore, let's say that a MenuItem has a property called MenuText
of type string that is the menu text that appears to the user.

Given this, your IComparer needs to look like this:

public class DiscountIDCompa rer : IComparer
{
public int Compare (object x, object y)
{
itemX = (MenuItem)x;
itemY = (MenuItem)y;
return String.CompareO rdinal(itemX.Me nuText, itemY.MenuText) ;
}
}

Nov 3 '06 #2
Thank you, that helped. I was just messing up the type cast... the
object was passed as a hyperlink. So, these modifications fixed the
problem, thanks again:

public class DiscountIDCompa rer : IComparer
{
public int Compare (object x, object y)
{
HyperLink HyperLnkX = (HyperLink)x;
HyperLink HyperLnkY = (HyperLink)y;

string strX = HyperLnkX.Text. ToString().Trim ();
string strY = HyperLnkY.Text. ToString().Trim ();

return string.CompareO rdinal(strX, strY);
}
}

Nov 3 '06 #3

jt*****@eudoram ail.com wrote:
Thank you, that helped. I was just messing up the type cast... the
object was passed as a hyperlink. So, these modifications fixed the
problem, thanks again:

public class DiscountIDCompa rer : IComparer
{
public int Compare (object x, object y)
{
HyperLink HyperLnkX = (HyperLink)x;
HyperLink HyperLnkY = (HyperLink)y;

string strX = HyperLnkX.Text. ToString().Trim ();
string strY = HyperLnkY.Text. ToString().Trim ();

return string.CompareO rdinal(strX, strY);
}
}
You're welcome. By the way, HyperLink.Text is already a string, so
there's no need to call ToString() on it:

string strX = HyperLnkX.Text. Trim();

Nov 3 '06 #4

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

10
8089
by: eLisHa | last post by:
i have an arraylist that gets it's values dynamiclly from the database, after paging, searching & more in the ASP.net file. What im trying to do, is sort the results that are sorted in the ArrayList, each time by another field. The ArrayList contains a list of a class which i built, that fits these results. I was told to use a IComparer with the sort method, after i try'ed just ArrayList1.Sort i got the following error:...
3
6463
by: Adam J. Schaff | last post by:
Hello. I recently noticed that the Sort method of the .NET ArrayList class does not behave as I expected. I expect 'A' < '_' < 'a' (as per their ascii values) but what I got was the opposite. Simple code: Dim y As New ArrayList y.Add("Abc") y.Add("abc") y.Add("_bc")
19
2469
by: Derek Martin | last post by:
Hi there, I have been playing with sorting my arraylist and having some troubles. Maybe just going about it wrong. My arraylist contains objects and one of the members of the object is 'name.' I would like to sort the arraylist based on object.name - is that possible? Thanks! Derek
7
1357
by: Derek Martin | last post by:
Hi there, I've asked before but never got an answer that could get me completely to where I was heading. I have an arraylist that contains defined objects and I would like to sort this arraylist based on the values of one of the object's members. Here is a bit of code to illustrate my setup: Object construction and insertion: Dim entity As New entityobjects(entitynamenodelist(i).InnerXml, typenodelist(i).InnerXml, ...)
9
2879
by: Paul Nations | last post by:
I've got arraylists of simple classes bound to controls. I need to search through those arraylists to set the correct SelectedItem in the control. The code looks like: Public Class DegreeMaintenance Private arrCipCodes As New ArrayList 'populate reader with data With rdr Do While .Read arrCipCodes.Add(New CipCode(.GetString(0), .GetString(1)))
16
6435
by: RCS | last post by:
So I have an ArrayList that gets populated with objects like: myAL.Add(new CustomObject(parm1,parm2)); I'm consuming this ArrayList from an ObjectDataSource and would like to have this support sorting (because it's ultimately being consumed in a GridView). I can't simply sort the ArrayList (because it only knows it's holding a bunch of objects). So I need a way to sort the ArrayList, based on the data - that is within the objects that...
48
4498
by: Alex Chudnovsky | last post by:
I have come across with what appears to be a significant performance bug in ..NET 2.0 ArrayList.Sort method when compared with Array.Sort on the same data. Same data on the same CPU gets sorted a lot faster with both methods using .NET 1.1, that's why I am pretty sure its a (rather serious) bug. Below you can find C# test case that should allow you to reproduce this error, to run it you will need to put 2 data files into current directory...
4
13312
by: M Harvey | last post by:
I have an arraylist that contains datetime values. What is the best way to sort this arraylist by date ascending? Thanks, Matt
3
6981
by: Stuart | last post by:
I am using Visual Basic 2005. I have created a two dimensional ArrayList named aSystem that is populated as follows:- aSystem.Add(New PickList(0, "Undefined")) aSystem.Add(New PickList(-1, "Standard UTM")) aSystem.Add(New PickList(-2, "UTM-NAD83")) aSystem.Add(New PickList(-3, "UTM-NAD27"))
0
9682
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
0
10875
Oralloy
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...
0
10566
jinu1996
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...
0
9401
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
1
7806
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
5669
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
0
5848
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
4474
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
3
3124
bsmnconsultancy
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...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.