Set ListBox Item Text Without Knowing What Kind Of Object It Is
May 14, 2010
I'm creating an editable ListBox control, where the user can double-click an item to edit it. When double-clicked, I simply overlay a TextBox over the item, so the user can change the text and then commit it by pressing Enter or leaving the TextBox. The 'commit' is simply this:[code]where 'editingIndex' is the index of the item being edited, and 'textBox' is the TextBox object.If the ListBox contains strings, this works just fine. The item being edited is replaced by the textbox Text string.However, if the ListBox contains some other object (let's say a custom class), this is a problem! It still "works", in that it still sets the text of the item, but the item is no longer an instance of that custom class! It is now a String, and all other information about the item is lost. So, I really want to let the user be able to change the text representation of ANY object, without replacing the object with a string. Obviously, I cannot know how the object displays its text (well, by the ToString function of course, but I cannot know what the ToString function returns).Now, I am having a few ideas how to approach this, but none really work the way I want. I am pretty sure that I'm going to have to provide some kind of event that the user has to handle. I'm thinking something like this:
- When the item edit is committed, an event is raised
- This event contains the Item being edited (as an object, the user has to cast it himself), and the new text of the item.-
- The user handles this event, and assigns the new text to the correct property.
For the Person class, this could look something like this.My ListBox should raise this event, and assign the new item like this.[code]I think this should work (although I haven't tested it), but there's one problem with this approach:When the items are just strings, the user still needs to implement this event handler, while he shouldn't have to (I can simply assign the new text string to the item). So, if the user is simply using strings, he still needs to do this for every instance of my listbox:[code]So what I'm really looking for is a way so that I can implement the default behavior (for String items), and still allow the user to override this behavior if he is not using strings.I may be overlookihe obvious solution here, but I can't figure it out... Overriding is done when you inherit a class, but the user isn't going to inherit my custom listbox (well he CAN, but he shouldn't have to). He is just going to handle the event. And if he doesn't handle the event, my listbox uses the default implementation.
problem that i am facing is i want to add array of object as a single item in listbox. in vb6 i was using this Label1.Caption = Label1.Caption & Mid$ (strInput, intI, 1) & " " List1.AddItem (Label1.Caption) i was using label. caption to store object but not work in vs2008 because label.text only take text and left other values
I have a user control housing text labels, buttons, images, etc.Is it possible to add this as a line item in some kind of list (without building a custom control to resize, scroll etc)?Could list view work?
Is there any way of accessing the keys and values (in javascript) in this array without knowing what the keys are?
The reason my json is structured like this is that the webmethod that I'm calling via jquery is returning a dictionary. If it's impossible to work with the above, what do I need to change about the way I'm returning the data?
Here's an outline of my webmethod:
<WebMethod()> _ Public Function Foo(ByVal Input As String) As Dictionary(Of String, String) Dim Results As New Dictionary(Of String, String)
I cannot figure out how to add an item to a listbox with a specific value. I am able to add a text description without any problems, but how can I give it a specific value?
In simple terms, I want to compare the value of a databound listbox display member with another string. However; I need to convert the listbox databound items to an array first as I may have to do 1,000's of comparisons on this.
I have a databound listbox from a sql server table that populates fine. I'm trying to retrieve the display value of a listbox item without selecting the item. My goal is to compare items in listbox1 with items in listbox2 and if item is in listbox1 matches an item I want to load into Listbox2, then I do not add the item to Listbox2. Listbox 2 is not databound but contents I'm loading come from a datatable.
So, I iterate through the items in listbox2's datatable but as I'm adding the items from the datatable to the listbox2, I check if the item exists in listbox1. The data that is being compared is the Displaymember of Listbox1 and a string value I want to manually load into listbox2.[code]....
l am trying to do this listbox1.selected item.text =textbox1.text.l am using vb.net 2010 , that syntax doesn't work.l just want to be able to change an item text in a listbox using a textbox.
Im trying to remove a certain bit of text from my listbox item..
heres my code..
If ListBox1.Text.Contains(".zip") Then ListBox1.Text = ListBox1.Text.Remove(".zip") End If
and when i start it and it tries to remove it, it comes up with an error saying
Conversion from string ".zip" to type 'Integer' is not valid. ive tried, this code.. If ListBox1.Text.Contains(".zip") Then ListBox1.Text.Remove(".zip") End If
I have a listbox that contains a bunch of email addresses from a SQL database.I have some code that I use to send an email with some values from my app.How can I loop through my list box and grab the email address to use as my mail.to.add(emailaddress) string I have this and it loops twice because Thats how many addresses I have in my test listbox.
For i = 0 To Me.lstbxEmailListR.Items.Count - 1
Looking for a line of code that I can use to set a string to the listbox text
next
I don't need to use a listbox, But I figured it was easy to use to grab the email addresses from my DB.
In the event of SelectedIndexChanged() I need to updated text of an item that is highlighted. If I remove it and .SetSelected again, this event will be entered repeatly. So how to update the text of this item in this event without deselecting and re-selecting it?
a dialogue box to have the user open a file they wish. I'm trying to open a specific file when a listbox item is selected and I have that down but I'm running into the problem of needing to have "" in the display which is impossible from what I can tell in the code. I just need to know what goes in the quotes which will open the file. Also lets say the text file was 'supportdoc1.rtf' and was located in a folder inside of the program folder called 'SupportDocuments' would the path be "SupportDocumentssupportdoc1.rtf" [Code]
Can I let my program select an item in a listbox based on a string (f.e. textbox.text)?So basicly, if an item in my listbox containst a certain string (text from a textbox), it should select that item..
I've been searching for a while, but nothing is doing the job.. Could anyone give me an example of this?
When I select more items in listbox then show items in textbox as like "item1 item2" but I need how can I show items in textbox separately such as "item1" "item2".
In my application I have a listbox and SelectionMode should be MultiSimple because users need to see which items they selected. In another tab we have another listbox this one should show all the selection users had done in first tab. Private Sub
I've been pondering upon my idea on how to create/update a text file using each item in a listbox as lines, but I fail each time. I've searched this forum as well as my friend, Google. Still nothing.
How to display text in a rich text box when an item is selected in a listbox. Here's a snippet of my Private Sub radGunsNRoses_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles radGunsNRoses.Click 'Declares songs into variables Dim strSong1 As String = "1. Sweet Child O' Mine" Dim strSong2 As String = "2. Novemeber Rain" Dim strSong3 As Integer = "3. Welcome to the Jungle" 'Band Picture [Code] .....
What I really want is that when radGunsNRoses is checked, the listbox displays the songs and when one is clicked, it shows the song's lyrics in the ritfSongs. Same thing goes for radACDC but the songs are different and the lyrics.
Function runs fine on the listbox until i use the btnUp_Lanemgr click event
throws an exception in function (below in bold) "Unable to cast object of type system.string to type namespace.myitem"
what i can do to make this work?
'Button moves selected listbox item up Private Sub btnUp_Lanemgr_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUp_Lanemgr.Click
How would one remove an item from a ListBox and then remove that line from the TextFile and repopulate the ListBox with new data in Visual Basic.Net?[cod]...
I am trying to load the text file to the ListBox Object. But it doesn't work.
' Initialize an instance of the StreamReader object and declare variables Dim objReader As IO.StreamReader Dim intCount As Integer = 0 Dim intFill As Integer
I have a RTB that I am generating during runtime. The users who will be using this app, need to be able to select unique IDs from a ComboBox and when they are selected, their value gets added to the RTB. Its ID is directly related to the their index in the combobox.
[Code]...
The problem, is that since the RTB is created during runtime, I won't know its created name. At anytime, there could be 10 RTBs inside of its own tab within a TabControls.So, anyone know how I can access the RTB without knowing its name?
How someone would select an item from a list box and click a button and have that item go into another listbox with it's price? I seem to be stuck on this part.
Here's my code:
I want to select the first option from the first listbox and I want to put it into another listbox along with the price of that item on the same line in the listbox. I can't seem to figure out how to that.
Public Class Form1 Const dcmPRICE_STRESS As Decimal = CDec(595.0) Const dcmPRICE_TIME_MANAGMENT As Decimal = 695
removing Listbox item from checked Listview item.The code I tried just errors out.
Private Sub ListView1_ItemCheck(sender As Object, e As System.Windows.Forms.ItemCheckEventArgs) Handles ListView1.ItemCheck If (e.CurrentValue = CheckState.Unchecked) Then ListBox1.Items.Add(Me.ListView1.Items(e.Index).Text) ElseIf (e.CurrentValue = CheckState.Checked) Then
Is it possible to select an item in one listbox and then display the data of another listbox with the same indexed position? I am planning a project and this is something I would like to attempt but I haven't figured out how to do it.[code..]
I tried doing the above code but instead of displaying the listbox text the message box just returned false.
I am using .NET 1.1, so I don't have the access to listitem object. I would like to change the text color or the background color of certain items in a listbox. can it do it in .NET 1.1?
