C# - Get ListView Visible Items?
Jun 25, 2012
I have a ListView which might contains a lot of items, so it is virtualized and recycling items. It does not use sort. I need to refresh some value display, but when there are too many items, it is too slow to update everything, so I would like to refresh only the visible items.How could I get a list of all currently displayed items ? I tried to look into the ListView or in the ScrollViewer, but I still have no idea... the solution must NOT go throught all items to test if they can be seen, because this would be too slow.I'm not sure code or xaml would be usefull, it is just a Virtualized/Recycling ListView with its ItemSource bound to an Array.
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Oct 24, 2010
With the Listview in Details view:When showing a long (scrolling) list:Is there an (easy) way to return the index's of which range of items are currently visible in the control?
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Aug 24, 2009
How can I check if a ListView has items that are not in its visible area?
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Nov 15, 2010
I've made an extended listview for my application but do get some strange behaviour when i scroll down and select an item.
This is the
Imports System.Windows.Forms
Public Class iListView
Inherits System.Windows.Forms.ListView
[CODE]...
The strange thing is that after scrolling up and down some items get visible again.
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Jun 27, 2009
How can i get the first visible item in a wpf listview (listview view is gridview).
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May 31, 2009
Is there anyway to tell if a scroll bar is visible in a listview?
When I'M drawing the listviewitem, I need to know if the vertical scrollbar is visible so I can make sure to make my item's width smaller than it normally should be.
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Mar 26, 2009
I use a listview control which is created at runtime because I don't need it visible to the user. I basically use it to store some information about paths, sort it and then pick out the data I need. It works very well apart from it doesn't seem to sort. For efficiency, I turn off sorting on the listview while the data is being added then enable sorting on the listview at the end. However, the sorting doesn't work. Is this because the listview isn't visible or am I just being daft?
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Sep 27, 2011
i have a listview box full of items, image below:
when i click a button i would like a msgbox to pop up displaying how many are alive.
How would i do this ?
Also how would i remove all items that status is "Dead"
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Feb 27, 2011
i made a media player program and i am having many problems! the main issue is that i have a listview that displays music playlist, how can i get it to navigate to the next item after the clicked one is over that way users don't have to click on the next one to continue their playlist?
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May 3, 2009
How can I save ALL of the items in a listview, items that were added by the user? I tried application Settings and tried creating a settings file but there is not a settings option for listview items.
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Aug 5, 2009
I have a number of textboxes and labels in a panel which has to scroll in order to view them all. The user is then able to scroll down and click on one of the labels which has a textbox that appears so the user can change the corresponding value in the label. For some reason, if the user has to scroll down at all to any of the labels that are initially out of view, when they click on the label the textbox appears far below as if it was at its initial position and not directly where the label currently is.
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Jun 22, 2010
im trying to make the listview sort the listview items by column (whichever column was clicked, sort the list based on that column)
in vb6 it was done by:
Private Sub ListView1_ColumnClick(ByVal ColumnHeader As MSComctlLib.ColumnHeader)
Static olditem&
With ListView1
[Code].....
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Dec 29, 2011
Since I am making a program with quite a few users with different access levels, I usually turn all the toolstripmenuitems to visible false first, before turning some of them to visible true again as specific to the users.[code]...
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Apr 27, 2010
Im trying to print out all the items/sub items of a listview into one string.
here is the code i have:
For Each lvwItem In ListView1.Items
' Print the subitems of this particular ListViewItem
For Each lvwSubItem In lvwItem.SubItems
[Code]....
How do i just print out the value (MyItem1) without the "ListViewSubItem: {}" part? I know i can use a string function to remove this, but id rather not
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Mar 13, 2012
I have the code below and when I try to populate the listview it populates all of the listview items but only the first subitem. No clue what I've got wrong.[code...]
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Jan 28, 2009
I've got a panel - that's in a group box. All of this - with lots of other textboxes on labels - is in another panel (the big panel).I make the big panel visible and not visible based on selections made by the user.This small panel - that's in the group box. I cannot seem to make it appear.Even if I leave it VISIBLE at design time - the objects in it will not appear.Is there some kind of nesting problem that I'm not aware of!
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Jan 25, 2011
I have five menu items that i have created as a user control and placed on the master page. Now i want one of the menu items to be visible only for particular user role and not visible for others. Here is what I did. Its not working though.
[Code]...
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Jul 17, 2009
I'm having an odd problem when making a form visible and not visible and it not continuing to function. Here is what I have happening. I have a main form (frmMain) that is an MDIParent. On this form I have a menu to open a second form (frmCalculate) and populate a listview from Items in the database.
As I click or select items in the listview on frmCalculate the tag is read and data is pulled based on the id stored in that tag and fills in various fields on the form. This works great. However, I also have a context menu attached to the listview that allows me to perform a "what if" scenerio on the items I am calculating. When I select this menu, I hide the frmCalculate and open the frmWhatIf form where I can mess around with values on the item I had hilighted in the listview on frmCalculate. Nothing is pulled from or written back to the database here, all the information is filled in from fields on frmCalculate. It just allows me to look at rising costs and how they will affect my margins.... anyway.
If I then close frmWhatIf, it brings my frmCalculate back by setting its visible propery to true (never closed frmCalculate, just hid it). At this point if I click an item in the listview I get an exception for a null reference. IF however I never hide frmCalculate, I can open and close frmWhatIF without ever having an issue. Why do I lose the functionality to select items just by hiding and unhiding the form? As a test I added two menus to the toolbar on frmMain one called hide and one called show. I then opened frmCalculate with original menu item to populate the listview and selected a few items to test that it was working and then using the hide menu I made the form invisible and the show button to bring it back. This yielded the same exception so without even opening frmWhatIf the problem still occurs.
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Mar 19, 2009
Dim str As String[code]....
but i get all the data into one single first column.
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Oct 15, 2011
I am looking for the a simplest for of code where I can add some items to a listview. i have 4 text boxes and 4 columns in a listview.. what could be the code to put 4 values as a single row in list view.. i managed to put put first textbox value as listviewitem (the first column) , but rest 3 has to be added as subitems... i am stuck here..
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Jul 22, 2010
I am trying to add get items from an xml document and load it into a listview. I keep getting an System.OutOfMemory exception on the line projects.Add(project). What am I doing wrong and how do I do it correctly? I got this code from murach's beginning visual basic.NET. When I run this it adds random spaces between the items in the listview
[Code]...
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Apr 15, 2012
How can I get items in listview? I know how to get the current item if selected but I am trying to put it in a loop where I need to get my three row items there. I have 3 columns and I want to get there items and insert it in entry string.
This code is wrong
Dim a As Integer = 0
For a = 0 To ListView1.Items.Count
columname.Text = ListView1.FocusedItem.Text(a)
columntype.Text = ListView1.Items(a).SubItems(1).Text
columnscale.Text = ListView1.SelectedItems(a).SubItems(2).Text
entry = entry + columname.Text + " " + columntype.Text + "(" + columnscale.Text + ")" + vbNewLine + "" & _
""
Next
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Jan 26, 2010
If I look at all the options for
me.ListView1.Items(index)
one of them is for Name.
So instead of coding
Me.ListView1.Items(index)
I can use
Me.ListView1.Items("Name")
But if I go into the properties of the ListView1 and look at the collection for the Items there is no place to set the Name.I can code Me.ListView1.Items(1).Name = "Name" and then I can code Me.ListView1.Items("Name")Where can you set the "Name" of the Items in a ListView?
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Jul 25, 2010
Can someone help me about the following code? how can i get the sum total to the label.[code]
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Feb 1, 2010
I am trying to search through listview in VB.net 2008. It works fine with small list, but when the list is big ( around 25000 rows), if I search multiple items , it fails saying that index is not valid. Obviously what I understand is , it it tryiong to remove an index does not exist. But I am unable to figure out where exactly it is going wrong.
PS : while it is doing search through the entire listview, I am incrementing index = index+5 becasue I want the next 5 rows to be in the selection state as well.This is the code Private Sub TextBox1_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyUp If (e.KeyCode = Keys.PageDown) Then
[Code]...
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Apr 12, 2009
I am having trouble adding items to individual columns. When I do the following[code]....
Everything gets added to the first column instead of the assigned column.
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Sep 4, 2009
Maybe someone here can shed some light. I created a Windows Mobile application with a ListView control. I want to add items to this ListView.
[Code]...
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Sep 8, 2010
I'm using a vb.net backgroundworker thread for processing and I need to periodically add items to a listview (with multiple columns) during the thread processing.I can easily use the following code for delegating the task to add an item to a listview, but I can't figure out how to additional info to other columns on the same row.he thread, I'd execute the following to trigger the invoke to add to listview:AddListItem(ListView1, filepath)Here is the delegate code, if someone can show me how to add the t
Delegate Sub AddListItem_Delegate(ByVal [Label] As ListView, ByVal [text] As String)
Private Sub AddListItem(ByVal [ListView] As ListView, ByVal [text] As String, Optional ByVal [text2] As String = "")
[code].....
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May 14, 2011
What is the best way to save listview items?
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Jun 4, 2011
I have a small application. When I click on a ListView row to Edit the details populated from the MS Access DB, I have the Else statement being executed all the time. Initially the code is attached behind a button named Edit. I have a Refresh button also which is clicked before the Edit button is clicked. Thus I just don't want to click on the OK button on the message box generated from the Else part. I just want to switch the Edit option between the ListView data when the ListView is item is clicked.[code]...
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