Get A List (or More Generically, Just An Object) Available Multiple Places?

Aug 23, 2011

In a program that I'm responsible for, we want to start keeping track of milestones. These milestones are quite simple and consist of a unique identifier, the project they're assigned to, a description, and a date that they should be accomplished by (or not, if there's no concrete due date).We use a slightly modified Model-View-Presenter architecture, and currently I'm passing this list around through the presenters, but it seems fairly clunky, so I was wondering:What's the best way to make this list available to all the presenters/views that need it?We're using VB.NET 3.5, and I was toying with the idea of making this a shared property of the main presenter, but it does seem like that adds some unnecessary coupling.

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VS 2008 Enumerating A List Generically?

Jan 7, 2010

Is there a way to write a single routine that could enumerate a list regardless of the data type? I am trying to write a custom XML serialization class and it would be great if I could enumerate all items in a generic list the same way, regardless if it was of type String, Integer, etc.

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When Adding A Value To Another Value The Results Eventually Change From 2-decimal Places To Multiple Decimal Places?

Mar 13, 2009

Problem: Using the sub routing below, when adding a value to another value the results eventually change from 2-decimal places to multiple decimal places.Basically, the amount stored should always only be 2 decimal places, because the values passed in are always 2 decimal places. Output from calling the sub routine multiple times.

Running total = 329430.75
New Withheld Amount = 710.79
Running total = 330141.54

[code]....

As a workaround, I have a new routine that uses a custom round function to properly store only 2 decimal places - as the VB round function does not perform the type of rounding desired.I understand that we are removing the value from the dictionary and adding it back..

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Start App From Multiple Places Within The Program?

May 11, 2010

I have written a program for cleaning my pc. I want to be able to start the Form1 (which opens the entire program) from the start menu. And I would like to run Form2 (which runs just the scan) from the context menu of the recycle bin. How can I open Form1 from one shortcut and Form2 from another?

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Structure Values Change In Multiple Places?

Mar 21, 2009

I have created two structures, one named "Product" and the other named "Item". These structures are quite similar but are at the same time quite different from each other. The structure definitions are as follows. Ultimately, I declare arrays in my containing class which access these structures as a type. Their declaration: "Products() as Product" and "Items() as Item". All has been fine and dandy until one day, I go to change the items Enabled() values, and something happens. Not only does it change the Items(index).Enabled(index) value, it does it on the corresponding Products(index).Enabled(index) value, even though it was never specified to do so. Also, nowhere in my coding have i defined this sort of thing to occur. It is rediculous, because I watch it happen. I turn on the watch window, and debug one step at a time, and every time, I watch the Item line step, I look down at the arrays of products and items, and both values have changed. How do I get this to stop, and only change the Item.Enable value??

<Serializable()> _
Public Structure Product
Public Name As String

[code]......

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Having A Selection Of Code Once To Use Multiple Times In Differnet Places

Jun 8, 2011

I know that title is kinda miss leading, but i couldnt figure out another way to explain it. I know theres a way, but I dont know how to do it.Ive got a Save code that I have about 5 differnet times in my application. How do I make it so that I can just type in something like Do Save, and it locates the save code and follows it through, then returns to where it was.

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Making A Console App That Displays Places For Multiple Times?

Apr 21, 2009

I am in a programming class, and am one of the best students in it, I even went to a state programming contest. One of the problems was to enter 6 race times and have it display the times back in order of which were fastest and their place such as

imput
11
15
12

[Code].....

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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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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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Cast A List Of Object To List Of Interface That Object Implements?

May 19, 2009

I am working in VB.net and have a Class, Foo, that implements an interface, IBar.I have a List of Foo's, but I need to pass a list of IBar's into a function, but I keep getting casting errors, even when I use DirectCast.My code is [code]MainWorks works, but it would be really annoying and inefficient to have to do that everywhere I want to call this function.

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VS 2008 Find Places To Add And Then Drawing -1 To Right Places?

Mar 10, 2010

so i got a program that i wanna derive in. like this:you right in this x^4+x^2-4x+8 and then the program will derive it to 4x^3+2x-4..how do i do that? like this x^4+x^2-4x+8 and then doing this 4x^4-1+2x^2-1-4x-x+8-8..how do i find the places to add and then drawing -1 to the right places?

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.net - Using Reflection For Generically Typed Delegate And Interfaces?

Aug 24, 2009

I have a bunch of classes that each have a property called Sequence. This property is implemented from an interface called ISequenced. For this example lets call one of these classes A. When I have a List(of A), I want to be able to sort them using the standard List.Sort(addressof delegate) where the delegate is a standard function that takes in two ISequenced objects and compares their sequence numbers and returns a boolean flag, rather than declaring a function for each individual class that implements ISequenced.

E.g.

Dim li as List(of A) = GetValues()
li.Sort(addressof SortBySeq)
...
Public Function SortBySeq(ByVal ob1 as ISequenced, ByVal ob2 as ISequenced) as

[Code]...

How would I declare the function in order to do this (if it is even possible in VB.NET?

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Generically Implement Exception Logging If I Have Already Got Many Try-catch Block?

Apr 20, 2012

I am writing ASP.Net Web-form in VB.

I have a system which have already handled exceptions by try-catch blocks everywhere.How do I quickly and generically implement exception logging like overriding something instead of inserting logging functions in every single catch block?

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How To Quickly Transform A List(Of Object) Into A List(Of "Object.field")

May 29, 2012

Suppose I have a list of Cat.

Public Class Cat
Public Property id As Guid
Public Property name As String
Public Property race As catRace
End Class

How can I quickly transform this List(Of Cat) into a List(Of Guid) using the id property?

I could do :

Dim newList As List(Of Guid)
For each item in catList
newList.Add(item.id)
Next

But I think there must be a way to do this faster (1 LOC). I just can't find how.

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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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C# - WCF Serialization And Interfaces - Error: List(of Object) Cannot Be Converted To List(of IMyInterface)

Oct 16, 2009

Does link text mean I have to return a concrete implementation? Even though I am using svcutil with the /r that includes my entites(where IMyInterface is defined). I get no errors but it changes all List(of IMyInterface) to list(of Object) and I cannot deserialize it on the client

Error: list(of object) cannot be converted to list(of IMyInterface).

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Does An Object Retrieved From A List Get A Copy Of That Object Or A Reference To It

Feb 1, 2012

In VB.net, when I retrieve a value from a list do I get a copy of that value or a reference to it?

dim blah as someObject
dim listOfBlahs as list(of someObject)
listOfBlah.add(new someObject(1))

[Code]....

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Why Is List.add() Adding Items To Object AND Source Object As Well

Jun 15, 2011

I need to be able to add elements to a copy of mylist.testlist without modifying the global mylist object. (Which seems to be happening via the below code.)When I am working on x, which should be a totally separate object, mylist is getting modified as well. How can I fix this? I have worked with lists extensively and never seen this behavior before. I have tested and reproduced the problem in .NET 3.5 and .NET 4.0 on Win 7 Pro 32bit.

Source Code:

Public Class Form1
Public mylist As New test
Sub Main()

[code]....

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Create List Of Child Objects From List Of Parent Object?

Jun 2, 2011

I would like to create list of child objects from list of parent object. Like If i have list of bookingroom which has one member room then i would like to create list of room from it.

eg. code:

Dim BookingRoomList As List(Of BookingRoom) = New List(Of BookingRoom)
Dim RoomList As List(Of Room) = New List(Of Room)
BookingRoomList = BookingRooms.FillGrid()

[Code]....

Is there any short cut method instead of iterating over for earch?

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Copy List Object To Another List Object

Jun 15, 2012

I am having a problem when setting VB.NET list object to another.I create an instance on ReadLocations and than create an object of ReadLocation where then I loop through ReadLocations and set ReadLocation1 equal to rl. What happens is that if I then go and change ReadLocation1 to something else (assdfhsd) it will also change the ReadLocations index. I am really confused why it would be doing that unless it is "=" sign means referencing instead of actually setting the value. Please help as I am a C# developer but the program I am modifying is in VB.NET.[code]

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Create A List Of List In That Would Like To Work On Multiple Accounts At Same Time

Oct 24, 2011

i am trying to create a list of list in that i would like to work on multiple accounts at the same time. lets say i have 5 accounts. every account has a seperate name. each account has a few fields. so i though of having a list of bookkeeping (with 5 accounts) and a list of accounts (with expense, income, tax, status, etc as fields). [code] and if the idea of using list of list works how do i loop through both lists.

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.net - Searching A List Of Objects In An Object List Using Linq?

Dec 22, 2010

I have 2 classes

Public Class Shipper
Public Property ShipperID As Long
Public Property CreateDate As DateTime

[Code].....

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Determine If List(Of Object) Contains Control Object ?

Nov 8, 2010

How to know if a List(Of T) contains any control object without using a loop ?This doesn't work

Dim lstObject As New List(Of Object)
lstObject.Add("STRING")
lstObject.Add(2)

[code].....

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Disposing Object Collected In List (Of Object)

Jul 29, 2010

I would like to ask what is the efficiency way the clean and dispose the object collected in the List (Of Object)?

Is that by calling the List.Clear() method will automatic clean all the object collected by it?

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VS 2008 Remove Object In List(Of Object)?

Feb 11, 2011

I am able to populate an object and output everything. How do I remove say the name2 object?

la.Remove(Logins("name2")) doesn't seem to work.
Private Sub btnListArray_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnListArray.Click

[code]....

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Multiple Textboxes To Multiple List Boxes?

Mar 13, 2012

Okay this is the simple thing I'm trying to accomplish. I can get richtextbox1 to add to listbox 1. but i cant get both to add. the compare works fine. I'm stumped.

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Asp.net Mvc - Creating A List (of String) Giving Error" Object Reference Not Set To An Instance Of An Object"

Nov 1, 2011

MVC 3 razor VB.NET project. I have resorted to manual building a list for a drop down box so I can insure certain values are available in the select list and also to control what the first item is in the list. The below is my code snippet for the part that is giving me problems..

[Code]...

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VS 2010 "Object Reference" Error When Adding Object To List (Of T) Property

Apr 25, 2011

I have a class that has a property that I declare like this:

VB.NET
Private _DirectoryList As List(Of FileDirectoryInfo) ''' <summary> ''' Array of directories. ''' </summary> ''' <value>Object</value> ''' <returns>Directory array list</returns> ''' <remarks>N/A</remarks> Public Property Directory As List(Of FileDirectoryInfo) Get Return _DirectoryList End Get Set(ByVal value As List(Of FileDirectoryInfo)) _DirectoryList = value End Set End Property

[Code]...

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Populate A List(Of Object) In A Class Method, Where The List Was Passed To The Method As A Parameter

Aug 13, 2011

I'm trying to code a class of RandomNumber. One of the class methods needs to populate a "List (Of RandomNumber)" ... which was passed as a parameter to the method ... with 10 random numbers between 1 and 50. DEAD SIMPLE :)

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.net - "Object Reference Not Set To An Instance Of An Object" Trying To Add To List?

Dec 19, 2011

I've created A list of object "emails" which contains the "email" object which has 3 parameters (String Address, String Subject, String Body)I then want to add to the list by creating more instances of "email". However, I've tried so many different ways and it's having none of it.

Public Class Test
Public emails As List(Of Email)

[code].....

If I click button1 I get the error "Object reference not set to an instance of an object".

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