Remove Items In One List From Another List?
May 2, 2012
i am writing a program that reads a excel report from accounting software with our weeks orders on... so basically the program reads a list of around 100 items which all works fine.I also have a database that holds info on each item, when the excel sheet is parsed the software checks to see if any new items have been added to the list that are not on the softwares database. this is where i am having the issue.I have two lists: ItemsOrdered & ExistsingItems.
All the items ordered this week are in ItemsOrdered and all the items not in the items in the database are in the ExistsingItems list. using these two lists how can i find items that are in ItemsOrdered but not in ExistsingItems.
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Jun 9, 2011
I have a listbox in my program and I want the user to be able to remove all Listbox Items with the click of a button.
I Figured this would work, Listbox1.Text = ""
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Mar 10, 2012
i am making a card game and you get three cards in your hand at a time, i am using a list and random assigning to set the cards in my hand as different numbers but they keep being all the same numbers, here is what i have, what should i add to make it be a different number for every one
Dim hand1 As Integer
Dim hand2 As Integer
Dim hand3 As Integer
[Code]....
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Aug 12, 2010
Good example using the List(T) object. I need to be able to add and remove items from it.
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May 25, 2010
How do i remove a selected item(s) from a list box called "LeftList" and add it to a second list box called "RightList"
[code]...
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Jul 28, 2010
Public Class GroupSelect
Public Property RowNo() As Integer
Get
[Code]....
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May 14, 2011
I'm supposed to create a linked list and add/remove items with a push/pop. Currently I can only push 2 items and pop one before it stops, and I'm not sure what I need to do to fix that.
[Code]...
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Feb 15, 2012
i i have a listbox and 1 button in my application thing i want is when i click on some listbox item auto press that button or when i click on some item in list box it remove selected items from list box just with mouse click
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Mar 27, 2012
I have a List object and I want to remove the duplicated items but leaving at least one of the duplicated items in the list;I wrote something like this however I would optimize this code for better performance, is there something faster?
Const chars As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
Dim rnd As New Random()
Dim mylist As List(Of String) = Enumerable.Range(1, 100).Select(Function(i)
[code].....
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Oct 1, 2009
I'm looping all the properties in an object via reflection:
For Each p As PropertyInfo In values.[GetType]().GetProperties()
If p.CanRead Then
'Do stuff
End If
Next
how to determine whether the property in question is a generic List(Of T)? If it is I need to loop the list itself.
I've experimented with GetType and TypeOf but have not managed to get anything working.
To clarify, I want to keep this generic. I do not want to specify the type of T, I need to loop the list items and call the ToString method on each item. T could be one of a number of different types (application specific reference types). Is it possible to do this without specifying types?
(VB.NET 2005 with .Net 2.0)
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Mar 16, 2011
This program is supposed to allow the user to check items in a checked list box. If the item is checked, it goes into the Completed List Box on the right. The program then adds the unchecked items to the Pending list box on the left. I keep getting placement values (e.g. O,1,2) instead of the strings (e.g. "Key Returned") in the list box results (see photo attached)
Public Class frmCheckOut
Dim i As Integer
Dim cleaning As String = "Cleaning Inspection"
Dim damage As String = "Damage Repaired"
[code].....
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May 16, 2011
Another program I am working on for fun, I am basically shuffling a list inside a listbox, what I want to do is delete the rest but not sure how to go through with that. At the moment I have this: [code] Just contains the code, declarations outside weren't included.So anyway, once clicked, it will call on the function to basically shuffle in a for loop, I was wondering if I should (or how should) create another function and call it in the click button or have just a loop in the click button so it deletes half the list. What I am doing is I have 20 list of items, I want the program to shuffle the items and then deleting the lower 10, meaning, if I had 10 items and wanted 5 top, I'd want: 0, 1, 2, 3, 4 and deleting 5, 6, 7, 8, 9.
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Jul 20, 2011
I am attempting to read the results from a SQL query into a List(Of) and I can see the List.count while adding items to the List increments, however in another part of my code when I am attempting to read the List the List.Count returns 0. My List is as follows:
[Code]...
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Nov 27, 2009
I have an error panel that is subbed in to a page if an error goes wrong to gracefully handle and display errors.Currently, I am just appending the error messages to a string and pushing that to a label. If you have multiple errors, this gets messy.I'd like to push each error to a list item in a bulleted, unordered list.How can I dynamically generate, from a vb codebehind file, new list items inside of an undordered list element?
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Jan 25, 2011
I have two generic lists, named ListA and ListB. Both ListA and ListB could potentially have duplicate items. What I would like to do is use LINQ to grab the items in ListB that are not in ListA, but I'm unsure how to do so.
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May 5, 2010
i want to search item A (from a list of X items) in list B but i want to get the item not found example Search ITEM A in LIST B if not found then return a print....if found continue with ITEM B..and so on.
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May 23, 2012
That was probably bad title, but I'll illustrate what I'm trying to do. I have a method in a class that I need to call several times. The method returns a List(Of String). I'm just grabbing some information from a database.
VB.NET
Public Function GetTestList() As List(Of String)
Dim int As Integer = 0
[code]....
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May 30, 2011
I have a List(Of MyObj), and I want to iterate through that list and compare each element to all other elements in the same list, excluding (if possible) the same element. I have a solution that works, but it's slow and uses double For loops. It may possibly have also summoned Cthulhu from his sleep. This below is a sanitized version of what I have:
Dim MyList As New List(Of MyObj)({Obj1, Obj2, Obj3, Obj4, Obj5, Obj6})
If MyList.Count > 0 Then
For i = 0 To (MyList.Count - 1) Step 1
[code]....
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Mar 28, 2011
I am writing app in vb.net
I have two variables one with list of RoomRate and other with list of RoomTypes.
We have RoomRates and RoomTypes linked with RoomTypeInfo variable insite the RoomRate.
So how do i find the RoomTypes which donot have the RoomRates Defined.
My Sample Code:
class RoomType
property UIN as integer
property Title as string
end class
[Code]......
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Nov 15, 2011
I want to know how to test the 1st list box if it has items more than the other list box but by one item, here is what i have: If lstInvisibleTv. Items.Count > lstInvisiblePc.Items.Count Then it works good if the lstInvisibleTv list box is greater than the other list box by one but it also works if it is greater the other one by one or more which I do not want. I want it to work just by one.
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May 27, 2012
I have a program that will compare an array of grocery list items glist and an array of coupon item clist.When I compare the two and if there is a match somewhere in the array I want to have a picturebox visible.When there is no match, I want the picture box not to be visible. [code] The code seems to work great until I come to the else statement.When the code finds a match it displays the picture box and the msgbox without error, but as soon as the message box is cleared, even though i've input it as an ELSE statement, the picturebox goes false again.Does anyone have any idea of how I can "hold" the picturebox to stay visible while the match between the arrays exists?
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May 13, 2011
I have a List which gets a Check Class like below:
[Code]...
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Nov 4, 2009
I have a simple class called Player. I can add players to it, but haven't figured out how to remove them. I've tried various ways, some compile some don't none work
Public Class Player
Public Name As String
Public Sub New(ByVal name As String)
[code].....
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Aug 16, 2009
I have a BindingList (of Class) list that is the source for a datagridview and I'm trying to figure out how to remove a selected line from the list.[code]...
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Feb 23, 2010
I fail to remove duplicates from my List. What am I doing wrong?
Dim Contacts As New List(Of Person)
...
' remove duplicates '
[code].....
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Feb 6, 2010
I have a List of a custom class (barData) that I need to remove elements form based on a date.
The bardata class holds data of stock price information.[cod]e...
Is there a way to do it without looping through each bar as I may have 2000 plus bars for each stock and may have 2000+ plus stocks to look at. It can be done by looping but it is slow.
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Jan 18, 2010
I need a piece of code which will remove a highlighted item from a listbox.
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Apr 1, 2008
Got a form linked to a database and i have the first column of data appearing in a list box on my form. In the database there are two records with the same value and so, of course, in my list box the value is given twice.How do i remove this repetition from the list box? (still keeping it the same in the database)
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Sep 29, 2010
learning about loops (still a beginner) in VB.net. I have got the below code and basically it is meant to stop the loop once it reaches a number above 20. Now, the problem is that it does stop after number 20 but the last number that is displayed in the list is always above 20..... how I can stop it showing the last number as above 20?
[Code]...
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Jun 23, 2012
I am creating a program which can store files, and I display their names in a list box, with their contents in another list box. My program can read the file names but has the file extension ".txt" added to all of them, meaning that the program cannot read the contents. How can I remove ".txt" from them? [code]
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