Create A List (of My Custom Structure) To Hold Only Unique Items?
Mar 8, 2012How can I create a list (of my custom structure) to hold only unique items? This list should be created from another list.[code]...
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Generics - List(Of T) - Use It To Hold Items Of Several Types?
Oct 3, 2009Assuming a base type of "Message"...
[Code]...
I would like to have one collection of Message objects which can be either PhoneMessages or MailMessages, so that I can iterate through the list and deal with each message based on what type it happens to be.
Attempting just to use .Add() fails, saying that I can't add an item of type PhoneMessage to a List(Of Message). Is there some elegant way to accomplish what I'm trying to do? I had thought I could accomplish this with generics, but I think there's a gap in my understanding. If it can be accomplished in .NET 2.0, that would be ideal.
Unique Items In A List
Nov 7, 2010I am new to VB.NET 2008 and a few users on this forum have suggested using Generic Lists instead of the old VB6 model of Collections. I need to add to the list of several items to the list, but what is happening it it is changing the first item in the list when I add the second, so there are now of the same item in the list. How do I add unique items to the list? Also, in the collection world, I could define a index of an item by placing the index value into second item of the Add Function.
[Code]...
Count Items In List(Of Structure) Using Predicate .net 2.0?
Jul 26, 2011I need to count the items that meet a criteria in a list(of structure) in .net 2.0. eg
Dim listcars as new list(or car)
Structure car
Dim Name as string
Dim year as integer
End structure
Now i need to count all cars with name toyota etc, how do i do it.
[URL]
Create A Custom Tree(view) Structure?
Jan 1, 2012I'm looking for a way to create the treeview structure in memory with a classes, so I can loop through them, like with a collection and easily load the data into a treeview, listview, datagridview or simply work with the data in the background.
There's a treenode class that I could use, but I've noticed that when I have a lot of data in the nodes, it has a lot overhead when for example serializing, because it also saves the checked state, imageindex of the nodes and things like that, which I never need. The saved file is about 10 times bigger than the actual data, which is not acceptable.
VS 2005 List(of T) - Create A List To Hold More Than One Control Type Or Create A List For Each Control Type?
Jan 20, 2011If I create a list for a TextBox:
[Code]....
I am able to only add controls that are of type TextBox. My question to you is, can I create a List to hold more than one control type or do I have to create a list for each control type?
Create Custom 2 Dimensional Array Data Structure?
Feb 20, 2010I want to create a user defined data structure, which will be a 2 dimensional array such that each individual square of this 2-dimensional array will also store the score and the grades. ( Iam using VB.NET)
More details: for example: There is an 2 dimensional array with 3 columns and 2 rows, I want to fill each of the
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VS 2010 Custom Type Array / List With Adding Items And Specifying Custom Type Variable
Jun 21, 2011I recently downloaded VB 2010 Express so i am quite new to the language, but i have worked with dark basic, which seems to b very similar.Anyway, my problem is that i cannot seem to correctly set out my array of a custom type/class. i am trying to create two arrays, one of available entities and another of selected entities of which the user selects the entities to be dealt with in irrelevant ways. i have creates a button (called test) which adds some entities to the available list and all the entities come back the same value but they shouldnt be as you'll c in the code. i have run the step into command a found that "available.item(#).Name = " will change all of the entity's names.As of current i am working with lists as the array kept asking for a 'new' statement but i couldnt figure out where to put it.[code]
View 7 RepliesStructure To Hold 2 Strings?
Nov 29, 2011I like to create a Structure that could hold 'Yes' or 'No' only; just like a Boolean variable could hold True or False.
View 12 RepliesCreate A List(of Bytes) Within A Class Structure?
Sep 2, 2011I have the following Structure within a class[code]...
How do I efficiently use this list?[code]...
Custom Control - Specifying Items To Be Added To List
Sep 30, 2009I've created a custom control that I insert into my window with the following code
Code:
<controls:ListExpander Text="Class Diagrams"></controls:ListExpander>
The control in question contains several subcontrols, among others, a list. How can create the setup, so I can specify items that should be added to the list?
Code:
<controls:ListExpander Text="Class Diagrams">
<SomeItem>data<SomeItem>
<SomeItem>data<SomeItem>
<SomeItem>data<SomeItem>
<SomeItem>data<SomeItem>
</controls:ListExpander>
In which case the SomeItem objects should be added to the list in the ListExpander:
Code:
<ListBox Name="lstItems" Background="LightGray">
<ListBox.Items>
// Items should go here
</ListBox.Items>
</ListBox>
I'm quite new to WPF, but I suppose it's something along the lines of creating a dependency collection on ListExpander that takes object of the type SomeItem? I simply want to be able to give the control a few arguments which it can translate into items in the listbox contained within the the control.
Structure Hold Small Number Of Reference Types?
Jun 10, 2009Is it okay for a structure variable to hold a small number of reference types? I thinks it's fine because the pointers themselves are not that big, regardless of what they're pointing to. But I never did fully figure out the whole heap/stack thing, so I'd like to make sure.
View 6 RepliesCreate A Fixed-length Unique String From Another Unique Numerical Value That Is Too Long?
Feb 13, 2012I am using VB .Net to access the eBay API and store all completed orders in a database. This database is then fed into a proprietary shipping system, which can not handle an order number larger than 20 characters. eBay returns an order number like so 230407279314-680141236013 which is too long. The order number is always 12 numbers a hyphen and 12 more numbers. What I need to do, is turn this (the result can be alpha numerical) into a shorter, unique order key to store in my database alongside the true orderId (so that this can be referenced by the shipping software instead of the actual order number). The reason for the 20 character limit is the barcode algorithm used. Is there any way to achieve this in VB .Net 2010? This number can be anything unique, so long as it does not exist already (even a good uniqueid function would work, but I would have to query the database to make sure it isn't taken)
View 2 RepliesAsp.net - .NET User/server Control With Custom List Items?
Feb 18, 2011I'm attempting to create a simple menu user control just as outlined here. The attached code results in an "Object reference not set to an instance of an object" error, but I can't figure out why.
<%@ Master Language="VB" CodeFile="MySite.master.vb" Inherits="MySite" %>
<%@ Register src="Controls/Menu.ascx" tagname="Menu" tagprefix="my" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
[Code]...
Best Structure To Hold 'array Of Arrays' Type Of Data That's Also Searchable
Mar 4, 2010I have a database table of company information.It's about 50 records and contains things like company id, company name, address, phone number, shipping rate1, shipping rate2,etc.I want to load that table into a structure that I can quickly search within my code.I want to search by id to find the company, and then use the company's data to update some records.My lazy way has always been to add a listbox for each piece of data, then do an indexof on the id, then access the same index on the other listboxes.[code]
View 6 RepliesCreate Some Custom Button Items In Code?
Mar 18, 2011I create some custom button items in code.I need to have some code for their Button_Click event and set Button.Checked = Not Button.Checked So I use this code:
[vb]
AddHandler MyAccount1Button.Click, AddressOf SubAccountButtonItem
AddHandler MyAccount2Button.Click, AddressOf SubAccountButtonItem
...
[code].....
Create Custom MessageBox With List Of Options?
Oct 15, 2009I want to create my own custom MessageBox.
The default message box from VB contains a few options (as a parameter) like:
MessageBoxButtons.OK
MessageBoxButtons.RetryCancel
MessageBoxButtons.YesNo
MessageBoxButtons.OKCancel
etc...
How can I create a sub that also has a list of options the user can choose from??
Multithreading - Create Custom Objects/list Of Custom Objects In .NET?
Jan 24, 2010I need two seperate lists, which every item is Integer, String, Bitmap - and one which every item is Integer, String String. However I don't know how to do this, or even where to look - I've googled for custom objects and custom object lists. What I'm trying to do is this.Custom Object1 is Integer, String, Bitmap Custom Object2 is Integer, String, String
In one thread I'll be adding items to List1(Of Object1), and processing them, and adding the results to List2(Of Object2), however I need to be able from other threads to look at the list and say only give me the items where Integer = (my thread ID), is this possible? Any help, or even links to information that would be relevant to this request would be helpful?
How To Create Collection Class And Add List Of Items
Oct 13, 2009How to create collection class and add list of items to collection class that stores list of items?
View 3 RepliesCreate A Dropdown List Of Valid Property Values For A Custom Control
Jan 8, 2010I've created a custom user control that has several properties. One specifies which database I want the control to access. I want to be able to present the user of the control a drop down from which he can select which database the control will interact with. How do I get the dropdown to work? I can get default values, but have yet to figure out how to get the selectable list.
View 4 RepliesCreate A User Control With A List Of Custom Class Type Property
Nov 29, 2011Is it possible to create a user control with a list of custom class type property? If it is, how can I? The issue is that, in designer mode the property is not displayed in property window. I can add the list on markup but when i switch to the designer mode it gives an error which is 'The user control does not have a public property named BookList'.
View 1 RepliesCreate A Linked List And Add/remove Items With A Push/pop?
May 14, 2011I'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.
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Fastest Way To Hold A Big List Of Something?
Jun 24, 2009so the way I have this working now I'M using System.Collections.Generic.List(Of T) for holding 100's of a structure.Dim Users as New List(Of User)
I was wondering if there was any better way or faster list container or something like this in the .net framework?
Making A List Box Hold A Value?
Nov 30, 2011I am a first year coding student and we are starting out with Visual Basic. Up until now I have been able to figure everything out, but I have run hard into a wall and I don't feel like I've been taught how to get over it. Here's the thing.
First Form
Contains a list box for products selected, and four text boxes for Subtotal, Tax, Shipping and Total.
Second & Third Forms
Each contain a list box of books to select from which will be added to the first form.[code]....
I feel like I am doing it wrong right out of the gate - as you can see I am going by the item that the user chooses, and adding a constant value that I have pre-defined in a module. Then I add the name of the book to the first form - but here's the issue.That text string doesn't hold a value.SO, when I use the remove button on the first form - the text string removes but the subtotal, tax, shipping and total boxes do not change in the least bit because the item that I removed doesn't retain any value.
Limit To The Maximum Amount A List(Of T) Can Hold?
Aug 3, 2009Is there a limit to the maximum amount a List(Of T) can hold? I need to know because I have a program that could potentially wind up in a really large loop that would add over 200 or so items to a list at one time.
MSDN search didn't really tell me much, but I'm in a rush at the moment, and was just wondering.
Get Unique Items From DropDownList?
Jun 12, 2009I am trying to grab all unique items from a DropDownList. Is there a simple way to do this?
View 5 RepliesCreate Array To Hold Xml Data
Aug 10, 2011I want to store the contents of an XMl file into an array but struggling to work this out. I have managed to read the data in and store in labels as a test. I then created an array list and used a message box to display the data to see that it has been stored. It does but I am not sure how to group this data. There are 3 records in the file. the idea is to end up with the following:
[Code]...
Create A Class To Hold Data In Studio?
Jul 20, 2010The problem is, I've never created a class before, not in VB, Java, or anything. I know all the terms associated with classes, I understand at a high level how classes work no problem. But I suck at the actual details of making one.[code]...
As for the Getter and Setter, the reason I put the question marks in is because I want to return the whole array there. The class will eventually have other properties which are basically permutations of the same data, but this is the full set that I will use when I want to save it out or something. Now I want to return the whole Array, but typing "Return fullDataSet()" doesn't seem like a good idea. I mean, the name of the property is "fullDataSet()." It will just make some kind of loop. But there is no other data to return.
Create An Mdi Parent Form To Hold All The Windows?
Sep 3, 2009have been developing an application for quite some time now. I have decided to create an mdi parent form to hold all the windows I have done so far. Is there an easy way to implement the mdi parent/ child associations?
View 12 Replies.net - Don't Create Local Variable To Hold The Reference Of The Object?
Nov 17, 2010How does the GC dispose objects created in the following 2 scenarios?
1)
Private Function DoSomething() As Boolean
Return New DatabaseManager().Insert()
End Function
2)
Private Function DoSomething() As Boolean
Dim mngr As New DatabaseManager()
Return mngr.Insert()
End Function
In Option 1, I don't create local variable to hold the reference of the object. In Option 2, I hold the reference in local variable.What option is better and why? (if any)