After reading some tutorials i have kind of grasped loading images in vb.net, you need to load them into an image list then use the "key" of the image to display it, i have put together this
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I have a listview control. it has an imagelist attached to it with two images in it. I have entered items into my listview, and they are using the first image in my imagelist.... GREAT! Now, there is a variable I have that will tell me which index in the listview is currently active, noting to do with what I select that could be at another index it's just what's being processed by the program at the time in some task.
Create a function that will change the images of all my listview items by looping through them. If the index variable is set to 2, I want the 3rd item in my list view set to use the 2nd image in my imagelist. The rest of the items in my listview need to be set to the first image in the imagelist.
I need to know how to use listview, I'm having trouble using it.What are listviews uses?What can be listed in listview?What cannot be listview?If an image is in listview, will it display a thumbnail of the image?
View 4 RepliesI have a listvew that is setup like:
[COLUMNHEADER1] [COLUMNHEADER2] [COLUMNHEADER3]
[CHECKBOX] Graham
[CHECKBOX] Greg
[CHECKBOX] David
What i was trying to do is put text in [COLUMNHEADER3] besides each of the names, so if "Graham's" details exist then put "PASSED" beside the name "Graham" and "FAILED" if it's failed, i'm not sure how to access the 3rd columns details to put that in is it:
formname.listview1.subitems("")
i have list view and i can load item from database.button 1 load items and subitems but column color is blank and i want to load it from button 2.[code]from button 2..how do i insert subitem to color. color is loaded from other database so i don't know how to do this without clearing all items.
View 2 RepliesI am using some code that searches a variable path (usually the entire drive) for images, it then displays the entire path in a listbox. I am able to use a picture box in conjunction to view the pics one at a time. How to display them all in a listview as thumbnails so i can browse them all instead of one at a time using the picturebox. The code I am using returns a array of files if it makes a difference....
View 12 RepliesI am very new to Visual Basic, and I need to add items from my database to the ListView control. I have a table in the database called tblChannels that I would like to draw the information from and populate the ListView control in VB, in the form of a column. I currently am unsure about how to go about doing this. Previously I have created combo boxes that draw the information from the database, but trying this method for the ListView does not work how I want it to.
View 5 RepliesI have some code which addes values into the items and subitems, which works fine.
vb.net
Case "Aa en Hunze"
Dim Lvi00 As New ListViewItem(New String() {"naam", "blabla"})
Dim Lvi01 As New ListViewItem(New String() {"adres", "blabla"})
Dim Lvi02 As New ListViewItem(New String() {"postc/plaats", "blabla"})
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the first is validating numeric input in a textbox to make sure it's got two decimal places. I think this should be really simple, but I'm totally missing it.The second is adding an extra summary line to a listview. I have it working with all the data required, but I need to add an extra line at the end showing some totals. How do I do this?
View 10 RepliesI have a treeview. The root nodes have images set at 30x30 - is there a way to add child nodes with NO image or a smaller image? I can do a blank image, but each child is spaced far apart! I would like the child nodes to be like there is no image... tight and close to each other.
View 13 RepliesProblem: Calling a method which uses a cell's value from a DataBound DataGridView. Works as desired without adding an image column.When I add the image column, the method attempts to use the value from column 1 instead of column 2, as the code in the 2nd method below ("findSign") states:
vb
Private Sub getAtmTOF()
Try
[code].....
In my project, I have a form with a background pic that I like, but unfortunately, I also have a ListView on that form which covers most of the picture. Now, is there a way to find the part of the background image concealed by the ListView, and then display it as a background image of the ListView at decreased opacity? You know, like a vague image.Just one more thing, setting the form's transparency key to the background color of the ListView is not an option.
View 39 RepliesDoes anyone know if it is possible to resize an imagelist/listview image without repopulating the image list? I am using scroll bar to change the image size from 25 point to 256 point. When I leave the scroll bar the imagelist repopulates from the files list. This can be very slow when working with high resolution pictures. I don't want to limit the image size to 2 sizes by using large and small imagelist.
View 1 Repliesi have created a form that has a combobox.the combobox displays the products.how can i add a selected product into a listview?
View 2 RepliesI've created a ListView called ListView1. In the first colum, I want to add either a stop sign or a grean light.
I create the columns
HTML
ListView1.Columns.Add("Item Column", -2, HorizontalAlignment.Left)
ListView1.Columns.Add("Column 2", -2, HorizontalAlignment.Left)
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This seems to generate alternating stop signs and green lights in the first column. Instead, I want to be able to decide which one goes on each row on the fly, as well as change them later.
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.
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Trying to figure out how to take a selected listviewitem and when a button is clicked add it to another listview.
View 10 RepliesI have tried reading the documentation and can't find a good example of how to add rows to a 5-column unboudn listview. I manually added the 5 columns thru the designer. I'm getting an error on the highlighted line of code. See attached screenshot.
Private Sub LoadComponentGrid()
Try
Dim lvItem As New ListViewItem
[code]....
I have a listview with 3 columns.
first - Process Name
second - Process Path
3rd / last - Process ID
I can easily get those details with mainmodule.filename and etc. But my main problem is with adding them to a listview.
I know I can do something like
Code:
ListView1.Items.Add("processname").SubItems.Add("hello")
But how to add a thirds subitem when I got a list of process in my listview. A button is click and then the listview will be added with processnames and paths. But I cant add the ID's cuz you have to give a specific listview item to add another subitem.
I have a ListView on one form that i am wanting to read the items and display on a different form. My code:
Dim oList As ListViewItem
For Each oList In fSOOrderEntry.OrderList.Items
lstDetail.Items.Add(oList)
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I don't know what this means. i want to ADD each listviewitem from one listview into another listview.
I'd like to verify if an image control has an image loaded . If it does , I want to unload that image (and load no image) , but if the image control has no image loaded , I want to load an image . Is it possible ?
If ImageMY.Image.Equals(Nothing) Then
ImageMY.Image = System.Drawing.Image.FromFile("C:ImageBlaBlaBla.jpg")
Else
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I currently have a line of text in my listview that is too long for the current width of my
listview, without increasing the width of my listview, is there a way to add a newline within the
listview line item so that it's 2 or 3 lines long so there's no need to have the user scroll to see
the text?
Most of the project I do, I use the datagridview to display the data from the database. What is the different between the datagridview and listview? If I want to display the data from the database, should I use the datagridview or the listview?
View 4 RepliesI am using VB express 2008 with MsAccess as database. How to bind a dataview to a listview i.e. how we can add data to a Listview from a Dataview.
Dim
DailyExpenses As New DataTable("DailyExpenses")
Dim dv As New DataView(DailyExpenses)
I read in some post something like under but when i tried to implement that ItemsSource is not a member of Listview:
listview.ItemsSource = dtView
Any snippet of code for adding groups at run-time to a listview. I am currently listing books (and stats) without groups via the following code which is executed in a loop (one pass per book title).
item = New ListViewItem
item.Text = seq.ToString
item.SubItems.Add(Mid(titlenode.Nodes(N_CSTAT).Text, 3))
item.SubItems.Add(Mid(titlenode.Nodes(N_JSTAT).Text, 3))
item.SubItems.Add(titlenode.Nodes(N_PUBLISHED).Text)
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The listview is set to details view. What I want to do is group the book titles by series. For example, books by Michael Connelly may be grouped by "Harry Bosch", "Jack McEvoy", "Mickey Haller", etc. I can create a new group for each new series by
groupnum += 1
group = New ListViewGroup("group" & groupnum, _
System.Windows.Forms.HorizontalAlignment.Left)
group.Name = "group" & groupnum
group.Header = series
But I cannot find how to add the group to the listview and add the new item to the associated group.
I have a Callback from a socket that get called each time I get a Packet, It then add an IP address to a Listview. Now I got all the IP with the Active Connections, I cannot, From the call back check if the IP is already added to the list so I made a class and a Delegate and used UI.Invoke to call the method and check if Duplacates then add the coordinating information, I went a Step further and did a lookup on host name to pull the computer hostname from the ipaddress, But I do it each time due to getting Multiple of the same IP and I do not want to do it on the thread that the UI.INvokes from due to resolving a Host name will lock the GUI for a full Second, so you can imagine doing this on a network with constant information.
Now what I want is from the Async thread that is receiving all the data to Invoke the UI thread, check if ListviewItem already exist then exit the Dispatched Sub, then from the Async thread again check the Classes return value then if it dose not already exist start the lookup, I have this so far but Im not 100% sure if it is working the right way, Is Invoke Async or Sync even though Im telling another thread to start, if now how can I made My Async thread wait on UI.Invoke to complete 100% so I can check the classes return value?
Async Thread
Code:
MySubPtr = AddressOf MyDispatch.TreeViewItemExist 'Trigger The Event Through Form1 Backed Up Handle!
Try
'Dim DoesTheItemExist As IAsyncResult
'IAsyncResult = MainHandle.BeginInvoke(MySubPtr)
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Public MaintenanceMenuList As ListView Function AddItems()
Dim lstModules As New ListBox()
MaintenanceMenuList.Items.Add("item_1")
lstModules.Items.Add(MaintenanceMenuList)
End Function I am receiving an error like "Object reference not set to an instance of an object". What seems to be the problem here?
I can add items to a listview this way:[code]But how can I set the Tag property of that same item as the same loop? I tried going ListViewItem.Items (0).Tag = "something"..But that doesn't seem to do the trick. How do I do this?
View 1 RepliesI need to be able to add items to a ListView Control and to additionally add a label as well. I have included an image to serve as a reference. This is for an application I am building for a handheld device.
View 2 RepliesHow do you add listview subitem by index.
View 13 Replies