For Each Loop In Arraylists?
Jun 23, 2012
OK, so I am creating a bit of code that will allow me to randomly pick one "card" from a "deck", delete that "card" from the deck, and repeat. I found in all of my research that vb.net has the arraylist that is supposed to be very simple in these situations. However, when I try to populate them with a For Each statement, I only get odd numbers in the array list. What am I missing?
Dim a As New ArrayList
For i As Integer = 1 To 52
a.Add(i)
[code].....
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Jul 2, 2010
I have two arraylists, and I would like to have a new arraylist with only the uncommon items. Is this the "best" or at least decent way to do it?
[Code]...
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Jan 5, 2010
I have two arraylists that contains links in one and the root url in the other. Sometimes the lists dont equal in number and I would like to iterate through the links list and if it contains a matching root url add it to a third list but also avoid any duplicates. I tried this but am not getting consistent results.
For Each link As String In urls
For Each part As String In post
If part.Contains(link) Then
[code]....
Perhaps there is another way; basically the part in post is a link to a page and contains the root url( which is link in urls). After extracting all these I need to ensure the 2 lists match.
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Mar 1, 2009
I was trying to use ArrayLists with My.Settings but I can't seem to figure out how to get them to work.If I make a setting called "Words" and make it an ArrayList without a value, the program has an error every time I try to run it. If I try to give it a value in the project properties window it always gives me an incorrect data type error. Besides, I don't want it to have a value, I want it to be blank such as when declaring a New ArrayList. The only way I can get an ArrayList My.Setting to work is by clicking in the Value box, clicking the "..." button in the corner and adding some kind of Object with the add button. This automatically puts some kind of wierd object in the first index of the array list. If I don't convert Item(0) of the arraylist to a string then it also gives me an error when I try to read it. As a string it comes up as System.Object. Even though I can use the my.settings.Words ArrayList with an object in the first index, how can I get the setting to start off blank without having to constantly avoid the first index?
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Jan 30, 2011
I have been tempted to use List(Of T) in VB.NET instead of ArrayLists by someone-who-must-not-be-named-Robinson.Essentially, what I need to store are three things: One string, two integers, and maybe two booleans. I liked using ArrayList, because it treated all its elements as "Objects" so I didn't really have problems storing that variety of elements.But now I have been thinking on using List(Of T). But how do I do to store that variety of elements of mine? I have been thinking on making a Structure holding the five elements.Sounds like a good idea? I heard somewhere that Structures are expected to have a short life. But I fear I will be having my structures for... forever, as long as my app lives. That makes any difference? Finally, what if I needed to create... dunno...... 125000000 Lists, each containing a structure? Is that possible (and good)?
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Oct 7, 2010
I have two array lists
dim Colors1 = New ArrayList
Colors1.Add("Blue")
Colors1.Add("Red")
[code]....
I would like to find out which colors are missing from Colors2 that are found in Colors1
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Sep 8, 2010
I have three arraylists (datasets and subsets) that I need to combine into one arrraylist so I can databind it to a repeater control and then present data to the user. As far as I know, you can only bind the repeater with one datasource (please correct me if this is wrong) that's why I'm combining these arraylists.Each arraylist has an ID from the database which I can use as a datakey to keep the data aligned. How do I combine these lists?
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Oct 28, 2011
I have searched high and low for a solution yet still no luck, I have two arraylists populate with FileInfo and I want to compare the two and write the duplicate (matching files) to a listbox.Here is how I have populated the arraylists but in terms of the comparison I have not found anything that works:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim arraylist1 As ArrayList
Dim arraylist2 As ArrayList
[code]....
What can I do next to compare the two and write the duplicates to ListBox1.
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Jan 5, 2010
I have two arraylists that contains links in one and the root url in the other. Sometimes the lists dont equal in number and I would like to iterate through the links list and if it contains a matching root url add it to a third list but also avoid any duplicates. I tried this but am not getting consistent results.
[Code]...
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Jun 2, 2009
I am trying to convert an algorithm to use them in order to save memory. However, I am struggling to achieve error-free code while using "Strict On".
Here is a basic version of the code I am attempting to use.
Code:
Option Explicit On
Option Strict On
Module Program
[Code]...
It works when I do not use the Strict option. How do I improve the code to compile error-free?
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Jan 30, 2010
Background: I'm writing a application that will allow users to enters items on a form using textboxes, radio buttons and checkboxes. I then take each input item and write it to it's own arraylist. After the user is all done entering data the information in the arraylists will write out to a single .txt file.
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Jan 5, 2010
I have two arraylists that contains links in one and the root url in the other. Sometimes the lists dont equal in number and I would like to iterate through the links list and if it contains a matching root url add it to a third list but also avoid any duplicates. I tried this but am not getting consistent results.
[Code]....
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Sep 26, 2011
I've got three arraylists of strings, and the "091: " part of the string is not part in the arraylist, thats added when I display them in the listboxes. So basically, how can I sort a list, and make sure that item nr 98 in english, still equals nr 98 in japanese and kanji?
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Jul 12, 2011
I am obviously not understanding something about scoping that is very basic. I have a very simple class:
Public Class testListClass
' This just contains a single list that is set by a property or the constructor
Private classArrayList As New ArrayList()
[code].....
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Jul 1, 2010
I did this before, but i totally forgot how to do it.I have an array, the array contains strings with 2 seperators.like so:
name1 / name2 / name3
Basicly i want name1, name2, and name3 in 3 seperate lists, or arraylists. But, i don't know how to do it.Each line is being read from a file.
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Mar 14, 2011
Makes the following statement about the code below:
**"The computer evaluates the loop condition in the Do...Loop statment to determine whether the loop instructions should be processed. In this case, the inputsales <> String.Empty condition compares the contenst of the input sales variable to the String.Empty value. As you know the String.Empty value represents a zero length, or empty, string if the inputsales variable is empty, the loop condition evaluates to True and the computer process the loop instructions. *If on the other hand the inputsales variable is not empty, the loop condition evaluates to false and the computer skips over the loop instructions.
Based on the code I think it is the opposite: ...that while the inputsales value is not empty it should evaluate to true and process the loop and if it is empty it should evaluate to false and skip the loop?
See below.
Option Explicit On
Option Strict On
Imports System.Globalization
[CODE]...
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Mar 9, 2011
I know I am missing the obvious. I would like a label to show how many cycles in loop are left.
[Code]...
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Nov 23, 2011
I am constructing a program, i am new to Visual Basic, but i have past programming experience. I was wondering if anyone knew how to form a loop that could...lets say calculate the answer when two numbers are added together,and it would repeat this thousands of times, etc. And if there is a way, would it be possible to calculate the time taken to complete this loop.
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May 3, 2010
I have written a function that gets the alexa ranking of a given url, now this function works perfectly but I want to loop through a ListView of urls and grab the alexa rank of each item (url) with my function.The code works great if I put a MessageBox in the loop to test that the function is returning a value but when I remove the MessageBox the loop does not work.I need it to loop through adding each result without a MessageBox stop in each loop.
vb
For Each Item In ListView1.Items
Dim result As Integer
result = GetAlexaRank(Item.Text)
[code].....
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May 31, 2010
So I made a simple patform game where the player has to jump quickly while the platforms move to the bottom of the screen, as to not touch the bottom of the screen. But, I need to know how to create a loop to loop the locations of the platform. This means that after twenty or so platforms, the same platforms come up again, so that the player will have an "endless" game. I've declared all the platform's locations relative to the location of the first repeating platform:
[Code]...
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Aug 11, 2009
I assigned an integer as 1, and looped my program using:[code]I can recieve the packets without looping, but once i loop, i receive nothing.
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May 29, 2012
I have this little application that runs a SQL query works great, now I want to have a Start Button run the and display results then System.Threading.Thread.Sleep(300 * 1000) for 5 min then run again and display results and loop till I buttonstop_click. unsure if the sleep is the best method.
[Code]...
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Sep 10, 2009
I am new to VB programming. I have the following code. When I execute my program only the last value from the loop is displayed in the label. I do write my code so that all of the values (years 1 to 5) show up in the label?
[Code]...
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May 9, 2011
I'm completely new to working with more than one thread at a time but I've been reading up on backgroundworker quite a bit today. I get the general idea and think I could use it ok if it weren't for the fact I have a loop in a loop and I don't think they could be run inside a single thread together
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Nov 18, 2009
How do you convert a loop to a for loop
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Sep 29, 2011
How would I convert this Do While loop to a For...Next loop? I can't figure it out.
intCount = 0
Do While intCount < 50
lstOutput.Items.Add(intCount)
intCount += 1
Loop
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Jul 21, 2010
Dim count As Integer
For count = 1 To 10 Step 1
Dim But+count As New Button
myButton+count.Width = 100*count
[code]....
Dim But+count As New Button => How to make it work
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May 25, 2010
I'm slowly learning about loops. I have a couple of questions
1) When a condition is being tested.. what does that mean? I don't understand the "condition" word.
2) What is the difference between a loop that never ends and a loop that ends?
I have the code for the loop that ends and the loop that never ends. I can see the difference in the code, but I don't understand what is making it different. Here is the code below.
[code]...
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Mar 15, 2012
I use the following code to add a row to an existing table
Dim newLineRow As DataRow = dsAccountDetails.Tables("Ph").NewRow()
newLineRow("Service TN") = "test"
dsAccountDetails.Tables("Ph").Rows.Add(newLineRow)
When I run the code it adds a single row to my table just like I want it to. However, when I put it in a loop it errors and tells me that the row already exists. The number of rows is always changing and I want to build the table from arrays. Why isn't the following working?
Dim a As Integer = 0
Dim b as integer= 5
For a = 0 to b
dsAccountDetails.Tables("Ph").Rows.Add(newLineRow)
Next
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Aug 28, 2010
Currently, lets say that I have this code:
While r <> "HI"
r = RandomStringGenerator(1)
time = time + 1[code]....
how can I make it so that i can say basically this:
While r <> "HI" Or While r <> "BY"
r = RandomStringGenerator(1)
time = time + 1[code].....
But it still doesn't work! What's up with this?
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