VB Listbox Cannot Be Indexed Because It Has No Default Value?
Mar 17, 2010
I have a listbox and I want to loop through each of the items to see if the string im looking for is inside. I know I could do .contains but that wouldnt look at substrings. The code im using looks like this:
While tempInt > Listbox.items.count then
if searchString.contains(listbox(tempInt)) then
end if
tempInt+=1
end while
Everything in the loop is fine but VB gives an error on the listbox(tempInt) part. The error is "class windows.forms.listbox cannot be indexed because it has no default value". get around the default value crap? I tried putting in a blank string but no change.
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Apr 2, 2010
I am new to classes, and I am new to Visual Basic in general, but I am working on a multi class program. The code seems to be correct, but I am trying on instantiate a class oject with the code:
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Mar 8, 2010
Structure EmployeeData
Dim EmployeeName As String
Dim JobTitle As String
Dim TaxRate As Single
End Structure
[Code] .....
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Aug 7, 2010
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.
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Oct 28, 2010
I am getting a strange error when I try to build my solution. The error occurs when I am calling the oGetHeaderValue function and passing the parameters.
Dim oGetHeaderValue As New clsGetHeaderValue
Dim returnString As String
returnString = oGetHeaderValue(strInvoiceNumber, strOrderNumber)
The error message is: Class 'clsGetHeaderValue' cannot be indexed because it has no default property.
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Jul 27, 2009
how do you declare a default indexed property in VB.NET such that it is callable from VBScript?[code]
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Apr 26, 2012
I am newer in VB NET.
VB code:
Public Class InputBox
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim a, b, S, p
a = InputBox("Enter length")
b = InputBox("Enter width")
S = a * b
p = a + a + b + b
End Sub
End Class
In InputBox lines i get this error:
Class 'LearningVB.InputBox' cannot be indexed because it has no default property.
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Nov 29, 2011
Am getting: "Structure cannot be indexed because it has no default property". What am I doing wrong?
With grid.Rows(10).Cells
Dim note As New Note With {.ID = "Blah", _
.Date = "1/1/2011", _
.Message = "AAA", _
[code]....
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Jun 2, 2011
[code]This is my Code the error is Class 'System.data.datatable' cannot be indexed because it has no default property.. When i try this code in oledb it works but here it wont..
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Mar 11, 2011
What i am having trouble doing is set the current parameter to the current row at a specific column like e.row[column index]
For Each trow As TableRow In table.Rows
cmd1.CommandText = "dbo.directway"
cmd1.CommandType = CommandType.StoredProcedure
cmd1.Connection = conn
[code]....
Class 'System.Web.UI.WebControls.TableRow' cannot be indexed because it has no default property.
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Nov 19, 2009
This used to work.
<AcceptVerbs(HttpVerbs.Post)> _
Function Widget(ByVal collection As FormCollection) As ActionResult
...
If ... Then
[code]....
I upgraded to ASP.NET MVC 2 Beta and ASP.NET MVC 2 Futures Assembly for Beta and now ToValueProvider() fails with this compile-time error: Interface 'System.Web.Mvc.IValueProvider' cannot be indexed because it has no default property How do I use ModelState.SetModelValue() if not with collection.ToValueProvider()?
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Apr 4, 2012
I've got a listbox and I'm setting a default value, or so I thought, in the form load proc., but it doesn't allow me to change the value later on. It sort of sets it permanently...
I've got values 1 - 12 and I want 10 to be the default showing on the screen for the users, but I do want them to be able to choose another value and be able to retrieve it from the screen when a button is pressed.
[Code]...
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Feb 3, 2011
Can you populate a Listbox and not have a default item selected?(Usually I see the first item in the list automatically selected at creation).
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Jul 29, 2009
So I am making a Proxy Clicker and I have a list box full of IP's, and that use the default port of 80. Buttons to start and stop clicking, and another list box just to display the status of the program. I want this program just to go through the list box of IPs and connect to the internet using the selected IP and the default port (80). [code] However, it gets an error after it finishes clicking the first one. When it goes to change to the second one and click it, it gives me an error saying that you cannot have 2 connections open at once. So I tried.. [code] What do I do to fix this error? What is it looking for inside the ()'s of the .EndConnect feature?
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Jun 10, 2009
how do i make it say that on form load, the first item in the listbox is selected?
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Jun 23, 2010
I have been trying to create a custom control based on the ListBox called FileListBox. I followed Microsoft's walkthrough but am having some trouble.
What I want is to add another property to the ListBox called SafeItems which is an ObjectCollection of strings (like the Items property). I will use the Items property to store a collection of Filenames as strings and I would like to store the corresponding SafeFilenames in the SafeItems collection.
This is what I've tried:
FileListBox.Designer.vb
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class FileListBox
Inherits System.Windows.Forms.ListBox
[Code].....
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Apr 7, 2011
I have a listbox on my form which gets items added as the program progresses, when there are more items than the box can display, the vertical scrollbar appears, fine... so far so good.I would like the scrollbar default position to be at the bottom of it's column so that the last entered item is displayed but can't find the relevant command, I assume there is such a command.
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Feb 16, 2012
I'm trying to create a class for storing data on People with another class to store their Bank Transactions.Ideally, this all be hidden away and leave only simple statments, declarations and functions available to the programmer.[code]I know this is possible as these exist in the Listbox Class though can't figure out how it's done.
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Oct 11, 2009
Public Sub LoadFromFile()
Dim sr As New StreamReader("CoverageArea.dat")
Dim strAreaLine As String[code].....
I have a question about that strAreaInfo()...I left the () with no number in it so that it wouldn't have a set # of values, and then I tried to give it 3 values, but I get the error in the title. Am I doing something wrong when I declare it?
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Sep 30, 2011
I'm working on a small game that is based on a map of grid squares.I have a class (clsGrid) that stores a few properties for each grid square.The grid square objects are organized into a list(of clsGrid).A loop and stream reader are successfully reading properties from a text file, putting the properties into grid objects, and adding the grid objects to a my list of grids. When retrieving a grid from the list of grids, I'm getting unusual results. Regardless of the index I give the list, I always seem to get the last indexed grid in the list.The debugger seems to suggest that the right numbers are being read into the stream reader and they are being added to gridHolder. However, the message box at the end will always show me the LAST grid.id, regardless of the index I give it.
'A subroutine that generates a map (list of grids)
Sub GenerateMap()
Dim reader As StreamReader = File.OpenText("map1.txt")[code]....
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Jul 6, 2009
I have a form with a lot of PictureBoxes. I created an array of these by name, but when I index the array I cant assign an image to the indexed item. In fact all the indexes appear to be nothing. Is there a way to create an array of controls and access them from the array?
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Sep 14, 2009
Say I wanna bind to dictionary that TKey is string with XAML:<Label DataContext="{MyDictionary}" Content="{Binding Item("OK")}" />Doesn't work.How should I do it?
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Oct 24, 2009
I'd like to create a Dictionary that is indexed by Strings: Dictionary(of String, ...). I'd like the Type after the comma to be an Array of MyObject's. If all I do is the following:
Dim D as new Dictionary(of String, Array)
I feel like I'm missing out on some performance very time I access a member:
Dim Object1 as MyObject = MyDictionary("Key1")(4)
Doesn't it have to perform some type of lookup to figure out what type of object the array is holding every time I access it in this manner?
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Jul 25, 2010
I would like to create a list of integers. The list will be items that I need to index by a key (string) or an index, which I set. For example I have items 1, 2, and 5. I would like to call Array(5) = 1. Where the the 5 is indexing a particular item 5, not the 5th item in the array. Using Array("5") = 1 could work as well. I tried using a List, but the only index is the ordered element of the list. I tried a Collection, but I kept getting errors that the items of the Collection are read only. How can I do this?
To be more specific, I have a simple game application which has a Player class. Each Player is trying to collect hits of say 3 fields {1,2,5}. I need to store how many times a player hits each of the 3 fields. So, I would like to read and write using logic like player(1).field(5) = 5. I want to add an object to the Player class which stores the number of times each of the 3 fields has been hit.
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Sep 26, 2010
I've wondered this for a while, when I hover over an object's properties when the program is paused (from a breakpoint) I can see the values of each property but when it comes to a collection it wont list the objects in the collection unless I specify an index, how do I specify an index?Basically I have a form with a ToolStrip that has 12 items in it, I would like to see what the 12th item is but can't because it's an indexed property.
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Sep 9, 2008
Can I have multiple 8 bpp Indexed Color Palettes and change them on the fly? And how would I refresh the image to the new colors? What I have is 8bppIndexed image, 256 colors.
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Jul 18, 2010
In Visual Basic 6:
[var = ] Point(X,Y) would retrieve the Color in Long from an Individual Point on a Form or Picture Box.
Components(TextBox, etc) were indexable into an array under one name.
Is there any manner to do any of this in Visual Basic Express? (I have the 2005 Edition.)
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Dec 1, 2011
Here's my
Public Class Form1
Dim imgImage As Bitmap
Dim clrOld As Color
Dim clrNew As Color
Dim blnChange
[Code] .....
I receive these error:
"SetPixel is not supported for images with indexed pixel formats."
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Nov 24, 2009
When writing to an Access file with one of the fields indexed (NO dupes allowed), I am getting the following message in the Immediate Window "A first chance exception of type 'System.Data.OleDb.OleDbException' occurred in System.Data.dll", when I enter a dupe.
I have put in a TRY, CATCH to catch the error and display a msgbox with the error. Is this message in the IMMEDIATE WINDOW just a warning message (generated by access), or is there something wrong with my actual program? My program does not actually crash, it seems to be working great.
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Feb 4, 2011
I am sending values from Combobox and Textbox to Access Database in VB.NET.I am phasing the problem when i enter the Duplicate values.In the database one of the column is Indexed.(Yes Duplicates not allow)That column i bind to Textbox("txtperson1").I used the TRY and Catche method to solve the Indexed Problem.when i run the application the value which i enter is not a duplicate that value save on the db. Once i enter the Duplicate value , the message box is showing "The Record alread saved".But After i enter the new value the same message is displaying, it is not saving on the db.
[Code]...
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