Sorting A List Based On An ArrayList Within A Custom Object

May 24, 2010

I am using a list to keep track of a number of custom Row objects as follows:

Public Rows As List(Of Row)()
Row has 2 properties, Key (a String) and Cells (an ArrayList).

I need to be able to sort each Row within Rows based on a developer defined index of the Cells ArrayList.

So for example based on the following Rows

Row1.Cells = ("b", "12")
Row2.Cells = ("a", "23")

Rows.Sort(0) would result in Row2 being first in the Rows list. What would be the best way of going about implementing this?

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Code Sorting An Object Within Arraylist ?

Oct 12, 2009

Class Murid
Implements IComparable
Public strNama, strKelas As String[code].....

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Sorting Objects In Arraylist By One Of The Object's Properties?

Aug 30, 2011

I have a group of objects stored in an arraylist. These custom type objects have a number of properties from their underlying class . I want to use one of the properties to sort the array. I cannot determine which Array.Sort method to use.

I want to sort based on an integer property. Virtually every example I can find involves sorting strings.

So, assume the Objects have the following properties.

Obj.name as string
Obj.ID as integer
Obj.Alive as boolean

The objects are kept in an arraylist called FriendsOfMine.

I want to be able to order the list by Obj.ID, both ascending and descending in value.

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Adding Custom Object To ArrayList At Runtime?

Jan 5, 2010

I am having issues adding a custom object to an arraylist at runtime.

Details of what Im trying to achieve.

My object is Fixture which represents a light. My light has the following properties:

Name, isMover, HighlightValue, UserNumber, Channels.

Channels is a dynamic arraylist which lists all the different channels of the fixture. A channel could be the lights colour or its intensity. A channel has the following properties:

Type, FeatureGroup, Value, Universe, Address, Slots and Offset.

Slots is the same again, breaking down to another ArrayList with more details.

Code:

Private Sub Patchingtest()
Dim TestFixture As New Fixture_Structure
Dim Intensity As New Channel

[Code].....

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Sorting A Dataview Object Based On A Column Number?

May 10, 2011

I have a dataview object that is being populated by database fields - so I can sort on these partulular columns by specifying the actual column names without any difficulty. However, I have been asked to add a few more columns to the dataview, and these columns will be calculated columns, not directly derived from an underlying database column.The users want to be able to sort on these new columns as well - even though there is no actual column name I can use to sort.

I have not been able to see where I can sort a dataview based on the actual column integer value used when the user clicks the appropriate heading to sort.

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VS 2005 Sorting A List (Of Point) Based On Distance

Mar 26, 2010

I have a list of collection of points on the screen. I want to order them based on their distance from a seperate, independent point. What's working is I have a function GetDistance which does the dirty pythagorian work of returning the distance between two points.

'Create the set point from which to start all measurements from (startpoint)
dim SetPoint as new Point(200,200)
'Create a list to hold arbitrary points to test (endpoints)
dim ListOfPoints as new list(of point)

[Code].....

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Vb.net - Sorting A List Of <Object> With VB And LINQ

Mar 1, 2012

I'm trying out some LINQ expressions and can't get them to work with the List class. Basically I want to be able to sort a list of custom objects by property type, however the C# LINQ syntax is KILLING me and I can't figure out how to convert it to VB

Class Foo
Sub New(Name As String, Position As Integer)
Me.Name = Name

[code]....

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C# - Access A List (Of T) Based Object From COM Client?

Feb 22, 2011

I am writing in VS2005 what, on the face if it, should be a relatively simple DLL, which will allow me to build a list of custom objects when called from within Excel 2007. To do this I have a Column and Columns class. As implied, Columns is a list of Column objects. The relevant classes are defined as follows:

[Code]...

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Copy The List Of Principal User To Arraylist To Use Arraylist.indexof?

Dec 1, 2011

What I am doing is iterating through all the groups that belong to the top group (Generic reports). Then I take advantage of the GroupPrincipal.GetMembers(True) which will recurse through a given group name. I test to see if the user exits under that group and if true I put the group name in an arraylist.

I use the for each principal in GroupPrincipal.GetMembers to loop through each returned user to see if they exist.

Is there a way to put all the returned users Principal.Name from a given group in GroupPrincipal.GetMembers into an ArrayList? This would allow me to to use Arraylist1.IndexOf to search for user. Which would be much faster then iterating through a returned list using the for each construct.

Sub RetAllMbrs(strUser As String)
Dim oPC As PrincipalContext = GetPrincipalContext() '<- this is function somewhere else in the code

[Code].....

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List Of New Custom Object?

Sep 2, 2010

I created a simple (for now) custom object:

VB
Public Class Form1
Dim AllPartFiles As List(Of Part)

[code]....

As I search a folder for files, it returns FilePath as a string for each file in the folder, then assigns a new Part.FullFilePath to the current returned FilePath, then add the Part to AllPartFiles list. So I can retrieve each Part from AllPartFiles later. But everything I try doesnt work.I know below is wrong, but might show what Im trying to do:

VB
Dim Files() As String
Files = System.IO.Directory.GetFiles(RootFolder, "*.ipt")
Dim k As String

[code]....

Create a New Part, change its values, and then add it to AllPartFiles list for later, then repeat?

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List(of Object) With Custom Add Action?

Dec 5, 2011

Looking to have a list(Of object) where i can make my own Add method, so i can do some stuff to an item when added

Is that possible at all, been looking at the net and haven't found anything.

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VS 2010 Sort List Of Objects, Based On Object Parameter

Oct 10, 2011

I made an object that has several properties one of which is an integer.

I put all the objects into a list, and I wish to sort that list by the integer property, with the object with the highest property at item 0, with the object with the lowest property at the highest item # ( count -1).

I made the list of that item, as in

Dim GameList as new list(of clsGame)

And I wish to do something like the following

GameList.Score.Sort()

What is the syntax to do that? I looked up the MSDN and didn't really understand what it was trying to say

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Accessing Objects From Within A Custom Object List

Mar 3, 2009

OK - for starters - I'm not even sure that the title of this thread accurately describes what I want to do - but I had trouble verbalizing it. So I will give this a try: In my application, I have a custom object, call it myObject. In addition, I have another custom object called myObjectList which is basically a List(Of myObject).

Up until this point, all of the functions that I have been working with in my BLL and DAL have been shared - I haven't needed a specific instance of my object thus far. I currently need to write a function that finds a particular myObject within myObjectList and returns to me myObject. I know that the List(Of T) has a find method, but from what I have read so far - I don't think it is what I want (doesn't it return true or false? -and also, do I need an existing object to pass to it to see if it is in the list?)

[Code]...

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ArrayList Sorting From Z To A (Descending Order)

Apr 13, 2010

Code:
Dim list As New ArrayList()
For Each item As String In l_input.Items
list.Add(item)
Next
list.Sort()
Ok this sort the list from A to Z alphabetical order but how do you sort in from Z to A, i.e. descending order. Summat to do with the comparer? I have no idea how to use the comparer. Or is there an easier way?

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Sorting/Splitting String In ArrayList?

Aug 20, 2010

Basically, Im running an SQL query to the database, which obviously returns data in their fields. What I want to do is add each record into an ArrayList and split the string based on fields. I.E

CustomerID,Surname,GivenName etc

How do I go about this? so far I have:

alstData.AddRange(sLine.Split(","c))
sLine = the record from the database.

This doesnt seem to work, it just display's the data in one line with no split such as 20205SmithJohn?

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Bound To A List Object Of A Custom Type Via A BindingSource?

Nov 11, 2010

I have a datagridview that is bound to a list object of a custom type via a BindingSource. From everything I've read, I should be able to click the column headers and the rows sort, This doesn't happen for me. Sortmode is set to automatic and the column headers aren't set to be used for selection so it should work.

I know that I could sort progamatticly but that seems a little bit of a waste given that I should just be able to do it by default.

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Using List Of Custom Class Object As Data Source For Crystal Report

May 24, 2011

I am trying to find way to design a report using my own custom class. I found links:

1.) How to work in Crystal Report with Object Data Source?

2.) Use .net object as data source in Crystal Report 2008

3.) Binding object with List<> to Crystal Report

4.) How to assign Custom class as datasource in crystal report

They were quite helpful, but I have been stuck in the first step while designing report as my custom class's property is not listed in field list of crystal report design view.[code]When I add my class objects to crystal report I do not get the usertype field from users class in field list.So how can I add usertype field to my field list? Or do I have to take another approach?The reason i wanted to use it as i am:

1.) Showing a form where user can type keyword
2.) program filters the records as per keyword using LINQ
3.) when user clicks the print button, I want to set the filtered records as datasource of my report

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VS 2008 - Error With Arraylist In My.Settings - Object Reference Not Set To An Instance Of An Object

Mar 14, 2010

The issue is when I try to add a new item to the ArrayList with the following code, it gives me an error:

vb Private Sub btnLabelAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLabelAdd.Click
Dim result As String = InputBox("New Filter Label:", "Label List")

[CODE]................

Object reference not set to an instance of an object.

I'm not really sure what I'm supposed to be doing with this. It's a new setting I just added and it's empty, so I'm not sure if that has anything to do with it or not. Anyone know what's going on and what needs to be done to get it to accept a value and not want to be "initialized"?

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Have Multiple Threads Run Through An Arraylist Of Object And Process Each Object?

Apr 30, 2009

I am trying to have multiple threads run through an arraylist of object and process each object. My problem is that each thread processes every object in the array.So they are not working together on the job. I made sample application to show my problem. I think the problem is somewhere in my ThreadSub() Here is the

Imports System.Threading
Public Class Form1
Dim myitems As New ArrayList

[code]....

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Reading ArrayList Of Custom Items

Oct 19, 2010

I have
Public ReadOnly Property StaffMembers() As ArrayList()
Get
Dim index As Integer
Return vStaffMembers(index)
End Get
End Property

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Create An Array Of List (not Arraylist) From A List?

Dec 15, 2009

I have a variable declared as...

Dim MyList as List(Of String)
I would like to create an array of these lists of string.
Something like....

[code].....

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Sorting Text File Based On Column?

Oct 5, 2009

I have lines like this

1.0 30 Blue (2 15.50 27.0) [2 15.48 24.1] 96111 19775 100493 19608
1.0 30 Blue (2 16.00 25.0) [2 15.26 23.7] 99111 23275 101123 18112
1.0 30 Blue (2 15.12 22.0) [2 14.97 17.9] 103611 17087 109706 16065
1.0 30 Blue (2 15.50 21.0) [2 15.15 21.4] 105111 19775 104509 17325
1.0 30 Blue (2 15.00 23.0) [2 15.23 17.9] 102111 16275 109706 17876

I want to sort the column that i higlighted in accending order.This is my code so far:

Dim FileContents() As String = IO.File.ReadAllLines(wirebot50)
For Y As Integer = 0 To FileContents.GetUpperBound(0)
If Not FileContents(Y).Trim = "" Then

[code]....

But this does not sorting anything. What is the wrong in the above code. And if i want to sort in decending order how to modify the code?

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.net - Arraylist Of Custom Classes Inside My.Settings?

Oct 17, 2010

I have a Visual Basic .Net 2.0 program. I'm moving the settings from an older settings file, to an app.config program settings file. I'm trying to do this as nicely as possible.

So, I added my setting as shown in this image.

On load I do this:

If My.Settings.databaseConnectionSettings Is Nothing Then
My.Settings.databaseConnectionSettings = New ArrayList()
End If

[Code]....

So, the question is, how do I get that arraylist of my DatabaseConnectionSettings saved to persistent storage? I want to do this in the cleanest way possible. That is, I don't want to have to convert it to a string or save it to a separate file every-time I want to use it. I would like to be able to use the My.Settings accessor method.

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Sort ArrayList Of Custom Objects By Member?

Sep 3, 2009

How can I sort an ArrayList of custom objects by public member? Example,If I have a list of article objects, and I'd like to sort the list by the rating member after I've filled the ArrayList

Public Class Article
Public bulletin As String
Public rating As Integer[code].....

Now I'd like to sort uniqueArticles by rating and print articles by rating order.How do I do perform that sort?

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List Of T Find Date Or Other Property In A Object In The List - Then Return Found Object?

Sep 3, 2009

After reading all the examples for list of T exists and Find and find first, none show how to handle multi-property objects. Below is bare bones example maybe someone could flesh out to show how this should be done.

Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim DatePriceList As New List(Of DateAndPrice)
DatePriceList.Add(New DateAndPrice(Date.Parse("1/1/2000"), 10.12))
DatePriceList.Add(New DateAndPrice(Date.Parse("1/2/2000"), 11.12))

[Code]...

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Custom Row Sorting In A DataGridView?

Jun 5, 2011

I have a DataGridView that is being populated via SQL with one table and is being filtered by Stock Code. I need to sort the view of one Stock Code by Nutrient names, but the sequence number is in anther SQL table. it would be easy if i could put the sequence in one table but that's not possible

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Asp.net - ASPxGridview Custom Sorting By Month Name?

Oct 10, 2010

I have an aspxgridview which groups first by year and then by month. Basically my query returns Month and year as seperate columns. Now if I return month as "January or February" then ASPxGridview does not know how to sort this.

I heard of custom sorting, but even then if I return month column as a number and use dataitem template to convert it to a name...it works but then when exporting it only exports the number not the dataitemtemplate.

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Display A List (Of Object) Which Has Single Objects And Child List (Of Object)?

Sep 6, 2011

Limited to using v2.0 of .Net framework (we use VB.net) due to environmental constraints on our servers.I've got an ASP.net webpage which pulls data from a webservice that performs checks on user accounts in active directory. Operators can check multiple accounts at one time using the web interface. The webservice returns a list(of AccountCheck) objects which themselves contain single properties like username, email address, and List(of AccountError) objects which contain multiple properties.[code]What I want to do is using some kind of repeater, create multiple panels or divs which contain labels showing the username, email etc, and a gridview which has the accounterror list bound to it to show all the errors. The users could be checking 2, 5, 7 accounts at once, and is dynamic.

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Add Object To Arraylist?

Oct 11, 2011

I'm having some trouble adding an object to an arraylist.

Basically the object has two properties (file id/name), but I can't figure out how to assign those properties. During runtime it errors out with public member on the object not found.

Private QueueList As New ArrayList
Public Sub Queue(ByVal FileName As String, ByVal FileID As Integer)
Dim QueueObj As New Object

[Code]....

I'd also like to know how I can do a loop on the arraylist and access the two properites on each record.

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Use Custom Comparer When Sorting By Multiple Columns?

Apr 7, 2011

I have a ListView (GridView) that I want to sort by 2 columns, so if 2+ items have the same value in Column 1, it sorts by Column 2. Pretty easy. But empty strings show up at the top when sorting A-Z. I'd like to move them to the bottom. I made a comparer (IComparer) that takes care of this, but I'm not sure how to use it.[code]...

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