Does Changing Generic List Capacity Means Copying Contents?
Mar 31, 2009
If I increase the capacity of a given list, or add elements until count>capacity, does this mean the program is actually copying the entire list's contents to a new space in memory (similar to redim preserve with arrays)? If so, than I have really been hurting the performance of my lists, as before I was inserting and adding without a second thought. This seems a strong restriction on the dynamic abilities of lists.
Say I have a generic list that is a list of a structure.
[Code]....
I always get an error that it's a value and cannot be set. Is there a way to change it without having to make a local copy of the item, then set the item on the list to that local item?
I was developing a small function when trying to run an enumerator across a list and then carry out some action. (Below is an idea of what I was trying to do. When trying to remove I got a "Collection cannot be modified" which after I had actually woken up I realised that tempList must have just been assigned myLists reference rather than a copy of myLists. After that I tried to find a way to say
I am trying to create a list of a generic type in vb.net 2.0 framework. This is the generic type definition:
Public Class GenericParamMap(Of T) Public Sub New(ByVal pParamName As String, ByVal pPropValue As T) mParamName = pParamName
[Code]....
The compiler does not allow a "T" in the method's parameter because it's not defined, but I'm not sure how or where to define it. I thought it was okay to have a generic method definition.
I am having a hell of a time figuring out where I am going wrong in copying the contents of arrays to listboxes.
I am using textboxes to input team numbers and team names.
The code for that is as follows (used in a button after the data has been entered in the text boxes:
Teamname, Teamnumber and numteams have been previously declared as public variables (string,integer and integer) in a module as they are used throughout the project. Numteams has had a value ascribed to it in a previous form
ReDim Teamname(Numteams) ReDim Teamnumber(Numteams) Dim thisteam As Integer
[Code]....
I have had to put in the "" for the Teamname variable as otherwise I was getting an error saying "Value cannot be null". I am also not sure what is causing that.
When I do that, I get 0 in the listboxes for all the teamnumbers except the last one which is right and blank strings for the team names except for the last one which is also right.
how to copy the contents of an existing Access file stored in a location (for e.g. C:/test.mdb) to a different location (for e.g. C:/Myfolder/testcp.mdb)
I am currently creating a little application which will essentially backup my work I do at college. It works by me saving all my work onto a flash drive. When I run the application it will copy all the contents of the flash drive and copying to my college directory and when I'm at home copy to my Dropbox folder. This essentially gives me 4+ areas where my work is saved. Unfortunately, the college computers due to network restrictions and other problems, the use Dropbox on the college machines (I obviously can still access the website).
I am trying to show a list of folders then copy only the selected folders.It displays the folders correctly but copies only the contents not the folder itself, how can I correct this?
Display files
Private Sub ListDirs() SrcFolder = (("\" & (OldPCTxtBx.Text) & "" & "C$")) Dim dir As New IO.DirectoryInfo(SrcFolder) For Each subFolders As IO.DirectoryInfo In dir.GetDirectories
I am trying to create a code where I placed sets of numbers in an array.I'll use a masktextbox to have the user enter the numbers to match what's in the array. If the user enters the number, ex: social, and the data is correct (matches the numbers in the array), something happens if the number entered in the masktextbox does not match any of the number sets in an array then another thing happens.The masktextbox so far only validates format and gets number only, however, I want the number entered to match whats in the array.
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?
Public Class notifierMain Public Class Contacts Inherits List(Of row) Public Sub New()
[code]....
When I debug this winforms application I get curType = "notifier.notifierMain+Contacts+row" I want to the Validate function to know it is in MyContacts. How do I do this?
i have issue returning a list in a web method. here is the code
<WebMethod()> _ Public Function getTags(para_parents As String) As List(Of getTypeDetailsByParentName_Result)() Dim context As New PPEntities
[code]....
the error is
Value of type 'System.Collections.Generic.List(Of SaftyonRoad.getTypeDetailsByParentName_Result)' cannot be converted to '1-dimensional array of System.Collections.Generic.List(Of SaftyonRoad.getTypeDetailsByParentName_Result)'
it seems always at this time I cant figure out how to do something maybe it has something to do with lunchtime.
Im having trouble using a method that is defined by an outside company
This is a link to their integration guide:
[URL]
This is their documentation for the class Im trying to use
OrderQueryWebService Class
This class is for SID in particular and is made for use with the notification methods. This is for the Order Query Web Service specifically, allowing clients to return the status of transactions for their merchant, whenever they want to.
Methods / <summary> / Pass through the variables required and receive a list of Transaction objects showing transaction status
[Code].....
The MerchantCode, the MerchantUsername, the MerchantPassword are all good the List is a custom type called SetComHash.Transaction
Everytime I try adding a string to the list such as the transactionNumber and some other values it gives me a type error:
"Value of type string cannot be converted to 'SetcomHash.Transaction'
What would be the fastest way to sort a list that contains a list of objects, based upon another list? An example follows:Say I have multiple lists of employees. Each individual list has a common property value, say "Department". So I have a list of employees, in one list they all have the department string value of "Sales". In another list all the objects have a department value of "Finance". These lists of employees are then contained in a list which holds them all.
I have a second list, which should drives the sort order of the employee lists. The second list simply contains a list of strings like, "Finance", "Sales", "IT" and so on. I'd like my lists of customers to be sorted in the order of "Finance", "Sales", etc.I'm using VB.NET in .NET 2.0
This problem is with the WebBrowser component. The code posted below is what I am trying to insert into the control before it renders the page for the first time. This question actually stems from this post: [URL]. I am developing the application in C#, however the problem is not really language specific.
When I have a page that has a javascript call to: window.print() I am wanting to override the print method so that pages do not pop up the print dialog. I can do so by inserting this into the top of the html: window.print=function emptyMethod() {};
I now just need to figure out how to get this code into the document html before the browser control renders it for the first time. I have tried a number of things (for a complete list, see the post listed above), all with no success.
I am facing an issue with the Hyperlink styles under Table of contents in a word Document.Here,I want to Change the Styles For Each Hyperlink for different Heading Levels under a table of Contents.But i am unable to change the styles.It is showing the default styles(Blue color,default Size etc) for hyperlinks.
I have problem in copying array in list box. Array has duplicate values but i want to avoid duplication in the list box. Is there any solution to avoid this duplication? Also in my case duplication in the array is essential but not in list box.
Dim x = GetType(List(Of )) 'valid statement Dim list As New List(Of String)
Now I want to see if list is a List(Of T) variable: Dim isList = TypeOf list Is List(Of ) On the last line I get a compile error: "Type Expected". Is there any cheap-performance TypeOf operator alternative for generics?
I have converted c# .cs to vb:= I have 6 errors on:
Red "List" says Too few type arguments to system.Collections.Generic.List(Of T)' Orange "Calendar" says Value of type 'System.Windows.Forms.Control.ControlCollection' cannot be converted to 'Form1.Kobush.Windows.Forms.Appointment'.
I need to copy the contents of one list box to a list box on another form. I've tried a number of ways of tackling this, including copying to the clip board and then to another form.....but with no success.
I am working on a functionality which requires me to copy the last line of a richtextbox into a textbox, then removing certain characters. The code I am trying is below. I have on a form a richtextbox (txtMain), 2 textboxes (TextBox1, TextBox2), and a button (button1). The first time a ran it, it worked perfectly - it selected the last line, copied, pasted it into TextBox1. Then after that first time it didn't do it. Perhaps there is a simpler way to get this last line consistently into the TextBox1. Here's the code. (See below the code for a copy of the text in"Text.txt" file):
I'm trying to copy the elements from a List(Of Frequency) where Frequency is a custom class I have made. Everything in the other places seems alright but the problem seems to be with the copying, where it still references the original table, so changing the values of one changes the original. I've tried the List.CopyTo() method and tried converting to and array with List.ToArray and then using Array.Copy but it seems they always change the original. I've also tried a for loop and create and New instance of the classes but that doesn't work either. What I'm using it for is to pass the List(Of Frequency) to a new Task to do multitasking(), if anyone can think of a better method to pass a List(Of Frequency), or an array to to a task and have it not change the original.
i m getting a collection of data in list's object. And from this list i want to get the maximum id.`
Dim objinfo As List(Of AlbumInfo) = objPhotos.GetPhotos_Alb_ID(Me.ModuleId, hdd_AlbID.Value) Dim Photo_Image As String = "" Dim str As String = Photo_Image & fu_Photo.PostedFile.FileName.Substrng(fu_Photo.PostedFile.FileName.LastIndexOf("."))
[code]....
this returns the "0"th positions id from Convert.ToString(objinfo.Item("0").Photo_Id + 1)but i want to get the last item's id.
<div class=PhorumReadBodyText>Hi, I have a problem with adding of items to generic list, problem is when I insert 1. item to the list, everithing is ok, but if I insert second item, first and second has same values.
code looks like that (asp.net 4.0): </div> <div class=PhorumReadBodyText> </div> <div class=PhorumReadBodyText>Partial Class _Default Inherits System.Web.UI.Page
I have a problem with adding items to generic list, problem is when I add 1. item to the list, everything is ok, but when I add second, first and second has the same values...
This is code (asp.net 4.0): Partial Class _Default Inherits System.Web.UI.Page <Serializable()> Public Class Product Shared Property Material As String [URL]
In my VB.net application I am populating my customer object and looping through it as shown below.As there are thousands of customers, I want to do it 500 customers at a time.Is there anyway I can have one more For loop to process 500 customers at one shot in vB.netI am not using LinQ as the database is Oracle.[code]
I want my loop to loop until it reaches the last string in my generic list. I know I could simply insert the last index of the list as an integer but I want to be able to use this if my list grows too. How could I achieve this?
