Re: Duplicates in a Arraylist - C# Discussion Boards

Vimalsoft(Pty) Ltd19-Apr-09 22:20

19-Apr-09 22:20

Good Morning ALL

I have an Arralist for example

Now i need to Find Duplicates in this array list. how can i get the Duplicated

Thank you

Vuyiswa Maseko,

Few companies that installed computers to reduce the employment of clerks have realized their expectations.... They now need more and more expensive clerks even though they call them "Developers" or "Programmers."

C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.tiyaneProperties.co.za
vuyiswa@its.co.za
http://www.itsabacus.co.za/itsabacus/

Re: Duplicates in a Arraylist

Abhijit Jana19-Apr-09 22:32

Abhijit Jana

19-Apr-09 22:32

You can try with IndexOf() and Contains() Methods
I have done with Contains(),

ArrayList Al = new ArrayList();
        ArrayList al2 = new ArrayList();
        Al.Add(1);
        Al.Add(2);
        Al.Add(3);
        Al.Add(4);
        Al.Add(3);
        Al.Add(2);
        Al.Add(1);
        foreach (int i in Al)
        {
            if (!al2.Contains(i))
            {
                al2.Add(i);
            }
        }
        Console.WriteLine("Original List");
        foreach (int i in Al)
        {
            Console.WriteLine(i.ToString());
        }
        Console.WriteLine("Array List With Out Duplicate");
        foreach (int i in al2)
        {
            Console.WriteLine(i.ToString());
        }

Hope this will help you Smile | :)

You can even try with implement with same ArrayList.

cheers,
Abhijit
CodeProject MVP

Re: Duplicates in a Arraylist

Vimalsoft(Pty) Ltd20-Apr-09 3:15

Vimalsoft(Pty) Ltd

20-Apr-09 3:15

Good Day Abhijit

Am Sorry i replied so late, i had to Look at some other Fuctionalities. I see what you are doing on the code. This will solve my Problem

Thank you

Re: Duplicates in a Arraylist

Vimalsoft(Pty) Ltd23-Apr-09 2:05

Vimalsoft(Pty) Ltd

23-Apr-09 2:05

Thank you very much for your Answer. i need the Duplicates Values i don't want to get rid of them i need them in a Arraylist

Thank you

Re: Duplicates in a Arraylist

OriginalGriff19-Apr-09 22:44

OriginalGriff

19-Apr-09 22:44

While I would use a List<t> rather than an ArrayList, the principle is the same.
1) sort your data.
2) foreach(...) loop to spot the duplicates.

allAlbums.Sort();
 #region Logging
 LogEvent(string.Format("       Removing Duplicates"),
          VerboseType.Verbose);
 #endregion
 List<Album> deleteThese = new List<Album>();
 Album last = new Album("? - ? 2099");
 foreach (Album a in allAlbums) {
     if (a.Name == last.Name) {
         #region Logging
         LogEvent(string.Format("   Marking \"{0}\"", a.ToString()),
                  VerboseType.TooMuchInformation);
         #endregion
         deleteThese.Add(a);         // Can't delete yet - would upset foreach
         }
     last = a;
     }
 foreach (Album a in deleteThese) {
     allAlbums.Remove(a);
     }
 #region Logging
 LogEvent(string.Format("       ...{0} duplicates removed", deleteThese.Count),
          VerboseType.Verbose);
 #endregion

Re: Duplicates in a Arraylist

Vimalsoft(Pty) Ltd20-Apr-09 3:16

Vimalsoft(Pty) Ltd

20-Apr-09 3:16

Good afternoon OriginalGriff

Thank you for your Help. Your solution is great. i have what has been posted before. but i will still look into it

Thank you

Re: Duplicates in a Arraylist

N a v a n e e t h20-Apr-09 1:21

N a v a n e e t h

20-Apr-09 1:21

ArrayList is too old and try to avoid unless you are on .NET 1.1.

Method 1

list.Sort();
int i = 0;
while (i < list.Count - 1)
{
   if ((int)list[i] == (int)list[i + 1])
        list.RemoveAt(i);
   else
        ++i;
}

Method 2

ArrayList target = new ArrayList(list.ToArray().Distinct().ToArray());

This works only when you have System.Linq namespace imported.

If you use .NET 3.5, use HashSet(T) class. It will not allow duplicate entries to be created. For .NET 2.0 or later, use List(T) other than ArrayList.

Smile | :)

Navaneeth

How to use google | Ask smart questions

Re: Duplicates in a Arraylist

Vimalsoft(Pty) Ltd20-Apr-09 3:22

Vimalsoft(Pty) Ltd

20-Apr-09 3:22

Good Afternoon N a v a n e e t h

The Duplicates are Created Intentional. My Client changed the Requirement. i was displaying a something like this

Staff  Cycle
=============
James  |4
Andrew |3
James  |2
James  |12
James  |33
Cole   |23
Daniel |56

This was Displayed in a Grid, so my Client want those with same name Displayed as a String. Now i wanted to Loop on the Grid on client side and look for the "James's" that appears more than once and put them in Arraylist or HashSet(T) after that and Display it like this

Staff  Cycle
==================
Andrew |3
James  |4,2,12,33
Cole   |23
Daniel |56

Those that appears once , can remain with their single Value.

Thank you for your Help

Re: Duplicates in a Arraylist

Alan Balkany20-Apr-09 3:55

Alan Balkany

20-Apr-09 3:55

A good approach is to use a hash table of List<int>, indexed by strings.

For each staff name, if it's not in the hash table, add it with a new List<int> containing the single cycle number.

If the staff name IS in the hash table, just add the cycle number to the existing List<int> associated with the name. Then to display the result, for each name in the hash table, write the name following by every cycle number in the corresponding list.

This approach only requires one pass through the data, and doesn't require sorting. The running time is O(n).

Re: Duplicates in a Arraylist

Vimalsoft(Pty) Ltd7-May-09 3:18

Vimalsoft(Pty) Ltd

7-May-09 3:18

Thanks for your Advice. i have implemented the hashsets and they work like charm

Re: Duplicates in a Arraylist

#realJSOP20-Apr-09 3:08

#realJSOP

20-Apr-09 3:08

You should take "C#" out of your sig until you learn it.

This has been asked/answered at least twice before. It's homework, isn't it?

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Re: Duplicates in a Arraylist

Vimalsoft(Pty) Ltd20-Apr-09 3:25

Vimalsoft(Pty) Ltd

20-Apr-09 3:25

Good Afternoon Mr Simmons

I Admire your work i must say.

To Answer your question, this is not a homework, when you say this has been asked twice , Am sorry i have not come across it and i certainly goggled for it before i posted.

Thank you sir for your comment

Vuyiswa Maseko

Re: Duplicates in a Arraylist

PIEBALDconsult20-Apr-09 14:11

PIEBALDconsult

20-Apr-09 14:11

If you don't want to have duplicates, I suggest using a System.Collection.Generic.HashSet

If you do want duplicates, but want to know about them, you may want to wrap something around a Dictionary and have the value of the Dictionary be the number of times the key was "added".

What exactly do you want?

Re: Duplicates in a Arraylist

Vimalsoft(Pty) Ltd7-May-09 3:17

Vimalsoft(Pty) Ltd

7-May-09 3:17

Thanks for your comment. i have already implemented them.

Thanks

Publish : How i set the installing(Destination) path

ddravin200019-Apr-09 21:48

ddravin2000

19-Apr-09 21:48

Dear,
i published my project. it creates a setup.exe file into published folder.
when i run this setup it installs the project and create a shortcut into start-Program-project->prj.exe

can any one tell me where i found the installed file in my pc?
and how i set the path for this at the time of installation?

Re: Publish : How i set the installing(Destination) path

Abhijit Jana19-Apr-09 22:10

Abhijit Jana

19-Apr-09 22:10

ddravin2000 wrote:
can any one tell me where i found the installed file in my pc?

Right Click on Exe > Properties > Click on "Find Target" Button.
You will get the application Folder Location Smile | :)

ddravin2000 wrote:
and how i set the path for this at the time of installation?

Yes, you can set the Installation Path.

In Setup Project
1. Select "Application Folder"
2. Go To application Folder Property Windows
3. Change the DefaultLocation Property
Default Location will specify the application install location on target computer.
by default it is [ProgramFilesFolder][Manufacturer]\[ProductName]
You can configure it Wink | ;)

Hope this will helps you.

cheers,
Abhijit
CodeProject MVP

How to insert relational Data with TableAdapter.

hdv21219-Apr-09 21:30

hdv212

19-Apr-09 21:30

Hi my question is that how to insert relational data with tableAdapter. for example we have 2 tables:

Orders (Parent Table)
OrderDetails (Child Table)

now, we want to insert new Order and some OrderDetails record in Relational mode :

Insert new Order & it's OrderDetails together
Order1
   OrderDetails1
   OrderDetails2
   OrderDetails3
Insert Operation ...

as u can see in my scenario, the OrderDetails to be inserted is DataTable, not a single record. i found this article, but indeed, my problem was no solved Because :
1. it's implement by DataAdapter and i'm using TableAdapter. i think TableAdapter has a built in functionality to do this.
2. it's a single child row, wheras in my scenario the child is DataTable.
any Help ?
Thanks

Binding data to the combobox

Schdev19-Apr-09 21:14

Schdev

19-Apr-09 21:14

Hi,

I am binding data to the Combobox from the database using the DataSource,DisplayMember and ValueMember.

I want to display a default text named --Select-- at index 0 in the Combobox, apart from the values in the database. How do I achieve this? I am using DataSet.

Thanks in Advance.

Re: Binding data to the combobox

karlodegrano19-Apr-09 21:55

karlodegrano

19-Apr-09 21:55

You can add manually by using ListItem.

Create a ListItem with a corresponding value then insert it into the existing Items of the combo box..

You should do this after databindin event.

Re: Binding data to the combobox

Mycroft Holmes20-Apr-09 0:55

Mycroft Holmes

20-Apr-09 0:55

I do this all the time, so much so that I create a method the inserts a row at position 0 in the data table. Create a new row based on the table, populate it (relevant fields only) with your default value and use table.rows.insert.

public static DataTable TableAddRow0(DataTable oTable, int iLabelCol, string sLabel)<br />
		{<br />
			try<br />
			{<br />
				DataRow oRow = oTable.NewRow();<br />
				if (oTable.Columns.Count > 1)<br />
				{<br />
					oRow[0] = 0;<br />
					oRow[iLabelCol] = sLabel;<br />
				}<br />
				else<br />
					oRow[0] = sLabel;<br />
<br />
				oTable.Rows.InsertAt(oRow, 0);<br />
				return oTable;<br />
			}<br />
			catch (Exception)<br />
			{ throw; }<br />
		}

Never underestimate the power of human stupidity
RAH

Problem with Directory Resolution

Hiten Parmar19-Apr-09 21:06

Hiten Parmar

19-Apr-09 21:06

Hi,
I am using Visual Studio 2008, i am writing a small code for Net Compact Framework. I use Windows Mobile Emulator. Now my code is in Directory "c:\Works\UI\MyProj". Now when i use following command

string path = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);

it returns \Program File\MyProj instead of "c:\Works\UI\MyProj". I want to access another folder in the same directory called Images. I use something like this

MyImage = new Bitmap(path + @"\Images\myImage.bmp");

but when i try to execute the aove statement it returns the following error

Could not find a part of the path '\Program Files\MyProj\Images\myImage.bmp'.

How do i access the Images folder in my project directory Frown | :(

Regards
Hiten Parmar

Re: Problem with Directory Resolution

Vikram A Punathambekar19-Apr-09 21:23

Vikram A Punathambekar

19-Apr-09 21:23

Check out the System.IO.Path class. Specifically, you may find Path.GetFullPath() and Path.Combine() useful.

If your image is located in a subdirectory in the directory of your app, you could just do

MyImage = new Bitmap("Images\myImage.bmp");

. You don't need the full path there.

Cheers,
Vıkram.

Carpe Diem.

Can I select which network connection (adapter) my application will use.

shovaly19-Apr-09 20:20

shovaly

19-Apr-09 20:20

Hi everyone,
Iv'e created small application that sends files to a server using ftp.
I got 2 network adapters on my machine.
when i monitoring the communication i see that each time a different network adapter is sending the package.
My question is can i select which network adapter to use in the code level (if yes how) or it should be a netwok setting.
thanks in advanced

BHO varying in system to system? [modified]

svt gdwl19-Apr-09 18:59

svt gdwl

19-Apr-09 18:59

Hi

I had an application of BHO. It had been developed using visual Studio 2005. Actually, it main aim is to read the text of HTML page and write that into a text file. I had checked this on IE6 and IE7 in various PC's. before that I had installed .Net Framework 2.0 also. If I register that dll in some pc's it works perfectly on both IE6 and IE7. but on some PC's it doesn't write the html page's text into a file? what may be the problem?

How on earth can I figure out why there is a difference? I have compared tools>internet options>advanced. The settings on both computers are identical. They also both have all 4 security zones at the same level and they both have the same general settings.

modified on Monday, April 20, 2009 1:24 AM

VBA calling C# code?

devvvy19-Apr-09 17:58

devvvy

19-Apr-09 17:58

hello

VBA calling C# code anyone? I'm looking for an article/tutorial.

Thanks

dev

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