VS 2010 Faster Way To Load A Listview In .NET?
Nov 4, 2010
OK, I've been searching for hours trying to find the best way to fill a listview from a comma delimited file but have come up empty handed so far. Currently I am using code I found on the NET, which works, but it is EXTREMELY slow. As a test, I created a file with 5,000 rows, and 10 columns. The column layout is as follows:123,NAME,NAME,NAME,NAME,0.00,NAME,YEAR,NAME,1
Dim ofd As New StreamReader(".dataCardData.bct")
Try
Using reader As New Microsoft.VisualBasic.FileIO.TextFieldParser(".dataCardData.bct")
reader.TextFieldType = FileIO.FieldType.Delimited
reader.SetDelimiters(",")
[Code]...
The code I am currently using appears to be loading the file and somewhat simultaneously filling the listview at the same time. I feel that I should load the entire file into an array or arraylist and the send the array or arraylist to the listview. However, if this is the best way to do it, I have not been able to find any examples of how to do this.
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Jun 22, 2010
I am loading images from the internet. I am using PictureBox1.imageLocation() but it takes a while to load the image. Is there a way i can load the images faster? it shows an error icon before it displays a picture...how can i get rid of that?
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Mar 11, 2011
A long time a agp I settled into a listview as an indicating device. I do not use pictorial modes or graphics. Just listing and multicolumn listing.I am also a performance bug and I have written realtime monitors for monitoring cpu activity in real-time and normally rum them starting at bootime. Lately I have found that the listview throws away time. In a tight loop, the list view does not take all cpu time available and the listview is relatively slow.
Does anyone know of a control like the list views only it's faster? Multi-colored and multi-columned are musts.
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Mar 21, 2011
How to load asp.net webpages faster using .htaccess.what was the coding for .htaccess so that the webpages loads faster ..i have hosted my site on ...ixwebhosting
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Apr 19, 2011
I read that by using queries instead of SQL, the form can load faster, however, I have this code that has categories and sub-categories how can I shorten this code to have the form load fastr?
[code]...
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Oct 5, 2011
For a touchscreen oriented application, i have an onscreen keyboard that can operated by both the hardware keyboard, or via touchscreen/mouse. The user needs this keyboard a lot, but. Because it has so much buttons, it loads really slow and takes about a second to finally display.
My Onscreen keyboard is of type dialog, and its background is set to the transparency key. Once the form is there it works really well. the problem is the 1 second loading time, this can be pretty frustrating when you need to edit like 20 things. Is there any way to preload the keyboard dialog and make it popup instantly?
[Code]...
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Feb 13, 2011
I have a few subs that run under Webbrowser1.document completed section of my app I know the code words because I tried it out using a new project and tied the code to a button and it works great. After stepping into my code during run time it appears that the app is trying to call my sub before the next page appears. What would be the way to place a pause on the Thread so that the web page can catch up before running the next sub?
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May 20, 2011
I need to copy listview items text, not subitems to array without looping, how do I do this?
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Dec 20, 2009
i want to know, which way program runs faster1- add image to button through its property -> assign image from project resource file2- on form load event, assign images to buttons, from project resource file
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Jul 4, 2010
I have an array of approximately 1000 classes. All of these classes must have one of their properties changed to the same value. I need this to be as optimized and fast as possible.
Would LINQ be faster than a for-loop? Any other ideas for faster execution?
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Sep 11, 2011
So I'm creating this little app to generate words from A-Za-z0-9 and then save that on my local database.Here is my code to do this:
[Code]...
PS. Fell free to help me modify my code. It's quite simple and horrible since if I start generating words more then 5 characters long, it will crash
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Feb 6, 2011
Suppose you have an array with 10.000.000 elements filled with values between 1 and 10, and you need to count how many fives it contains, something like:
Dim RandList As New List(Of Integer)
Dim r As New Random
Dim Counter As Integer = 0
For i As Integer = 1 To 10000000
RandList.Add(r.Next(1, 10))
[Code] .....
Here I got 2 problems, both versions are returning different values at each call with the same array, and the sequential ForEach is being executed much more faster than the parallel.
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May 26, 2010
I am working on a small program to teach myself how to use timers, and I would like to know if there is a way to make the timer control faster.I set the Interval property to 1 and it is to slow for what I am trying to do.(All I am trying to do is loop a button left to right, right to leftand so on in a Panel)
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Mar 17, 2012
I am trying to make an application that can do effects to images but the problem is when I use large photos its takes a very very long time. I am reading it per pixel with bitmap's GetPixel and SetPixel methods. Is there anyway to make this process faster without using C# or C++?
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Nov 15, 2011
I have a VB.NET 2010 app that uses a backgroundworker to process MS Word docs. All of the code does what it is supposed to do, except when my code calls ReportProgress(). The UI cannot process the ProgressChanged event fast enough before the values in the class that are passed are changed. I know this because I inserted a System.Threading.Thread.Sleep(100) line after each ReportProgress() call which allows time for the UI to make the updates properly. I guess I am looking for a better solution thanThread.Sleep(100) since this adds to the amount of time it takes to process all of the files. Here are some snippets of code that I am using:
[Code]...
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Nov 13, 2009
I need to perform a huge amount of registry read operations, and I'm trying to figure out a way to make each read operation faster than using My.Computer.Registry.
If I used APIs directly to do it, it should be faster, right?
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Mar 10, 2009
I save data from a ListView control to a xml file, and this works real great, but I can't figure out how to load the data again Private Sub ToolStripButton2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton2.Click
Dim x As New Xml.XmlTextWriter("C:Listviewout.xml", System.Text.Encoding.ASCII)
Dim i As Integer
x.WriteStartDocument()
x.WriteStartElement("ListViewItems")
i = lvFiles.Items.Count
[Code]...
rewriting the above so I can be able to load the same data again ?
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Nov 13, 2009
I have a xml doc that i want to load into a listview with the code i included i also included the xml.But i cant get it working.i am new to xml and read and searched for days now in the web of vb.net xml pages.I am using vs2008.
Dim XMLReader As Xml.XmlReader
XMLReader = New Xml.XmlTextReader("c:ookmagxmldoc.xml")
'Dim sFile As String = String.Empty[code]......
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Nov 8, 2011
This one has me stumped. My listview which is called Xlistview1 I would like for when the form opens it will automatically load the example.text file to the listview and also when the form closes to save it. And one more thing I would also like to give users the option to save it by browsing as well a save and load button. Is it possible to have both of these?
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May 21, 2009
I have a listview that I want to populate from sql database. only the data from the first name is coming out as listview item and subitems I can not get the lastname and other data. ex: william george Sinkor Monrovia Liberia below is my
vb.net
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
conNopee = New SqlClient.SqlConnection
Dim adpconnopee As SqlClient.SqlDataAdapter
[Code].....
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Nov 13, 2009
I'm building a web browser But im haveing an issue saving the Bookmarks and reopening the book marks
and also reopening the url when its clicked
i have a multi-colum listview
with 2 Coulums "Name" And "URL"
i want to save it on from close to a XML file and then reload them on form open but i dont know how to do it
also i want to set it so when you double click the site name it opens the URL
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Apr 19, 2012
I want to populate a listview and leave selected records that are true
I have a DB record which is ID int, desc varchar, selected boolean.
I have tried the code below
LVProducts is a Listview and DS is a dataset
CODE:
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Mar 7, 2012
i want to view a certain data in mysql that has a table with fields name,birthday,address,gender username,password,secret question,secret answer, and usertype, i only want to view username,password,secret question,secret answer and usertype on my listview. [code]
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May 12, 2009
I would like to open a listview with files from a folder directory, something like c:my files.
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Aug 16, 2011
I'm making an irc client (working)Now, I load all the users in a listview or listbox (I can choose)So I need the listbox or listview the be sorted by the ranks of the user.The ranks are in the listbox, but I just want the users with '~' the be at the top & the ones with '&' under those,
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Jun 23, 2011
i have a listview in my form and some items in it. so i want load image from listview to picturebox. to explain: listview have items in it with image like:
[Code]...
so if i double click on item1 i want to load that [image] to picturebox. btw picturebox is on form2. i think that you understand me. i use imagelist1 as largeImageList and imagelist2 as smalimagelist... here is the code that i try with:
[Code]...
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Dec 9, 2009
You can see. Listview1 which contain main menu of sales. And listview 2 which contains detail sale. If i click each item on Listview1 then correspond sale on Listview2 will show. I want to ask you. What best way for me to execute that. I mean what best way to store and load image to listview. I think i can use Imagelist or save Image to binary .
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May 30, 2012
what I am trying to do is, when a ListView loads, for the code to check the entry in column one, and then return a message box if the column contains a specific date.
I am using:
SUB I DONT KNOW THE METHOD TO INSERT THIS INTO. I NEED IT CHECKED WHEN THE LISTVIEW CHANGES
If lvuPreviousJobs.SelectedItems(0).SubItems(2).Text = "31/12/9999" Then
{
MsgBox("TEST")
[code]....
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Feb 23, 2012
the code below just all of the sudden started loading the list and then just decided that it wasn't going to let me view any of it lol nothing but a blank listview,,but according to the scrollbar there is stuff loaded.and while i'm here whats a good alternative to loading a listview using StreamReader .. it seems slow compared to the old vb6 loads I've done on list in the upwards of 45000 or more and even they loaded in less than 10 sec [code] 1 min after posting this and 20 min rubbing my head before that..i found the prob..the form load wasn't loading my headers at all..i didnt noticed that ..course there was no errors either.
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Jun 11, 2011
I am trying to save a listview item and 5 subitems to a txt file, I have tried one solution that was posted on here but i could not manipulate the code for all of my sub items.
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