Early Binding Late Binding
Aug 19, 2009
I started programming in VBA, then graduated to VB6, and I am now using VB.NET 2008 Express.I have read, in the various posts, that I should keep Option Explicit and Option Strict both on, in order that I use correct VB.NET code and not VB6.I am trying to do that but am totally confused with the results of one of my programmes that was running perfectly with Option Strict off, but now advises:Option Strict On disallows late binding. To me it appears that I am using early binding, but to be honest I am not clear on the binding situation. I have checked through a number of google items, and a number of this Forum's items without seeing the light.[code]
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Sep 5, 2011
i have this code:Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code]...
Error 1: Option Strict On disallows late binding.Im using visual basic 2010 express on a gateway laptop thats running Windows 7 OS How do i resolve this error?
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Apr 9, 2009
I have a listbox and it it I am showing numbers.It should look like this (line by line) 1,2,3,4,5,6,7,8,9,10,11.....but is is showing it like this 1,10,11,...2,20,21...3,30...ow can I make it that it will show it in number order 1,2,3,4,5......
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Apr 25, 2011
i am having some doubt & problems.
(1) if multiple versions of MS/office is installed in a computer & if i use late binding which version office instance will be rendered by the system.
(2) in the same way if i early binding then which version of office instance will open.
still be more clear i use late binding code. but here how to set the number format of the cell to text.
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Mar 1, 2010
I've been aware for some time that the Cells() property is early bound but the Cells.Item() property is late bound. In VBA this all works seamlessly apart from the fact that we lose intellisense in the VBA IDE in the latter case:
Code:
'VBA code
Cells. '<---- we get intellisense
Cells(1). '<---- we do not get intellisense
However, in VB .Net with Option Strict On this means that we have an extra consideration in that we have to explicitly convert to an Excel.Range if we want to set the range reference to a range variable:
Code:
'VB .Net code
Option Strict On
Imports Excel = Microsoft.Office.Interop.Excel
'
'
'
Dim oApp As New Excel.Application
[Code] .....
I'm comfortable enough with this because I'm aware of it and it is trivial to handle by explicitly converting to an Excel.Range. We also had a pretty good discussion about the Cells property a little while back in the VBA board which looked at some of its inner workings. My question is to dig a little bit deeper into the way that this has been implemented. I'm trying to get a better understanding about the reasoning behind the Cells.Item() property returning an Object rather than a Excel.Range?
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Apr 22, 2009
I have this piece of code that works very well and gives me the path the user's start menu:[code]This obviously uses late binding. Now say I want to do this in C#, or in VB.NET strict mode, neither of which support this kind of syntax with late binding.
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May 9, 2012
I'm trying to call this code in VB.NET with "option strict on":
Dim application As word.Application = New word.Application
application.WordBasic.DisableAutoMacros(1)
The WordBasic object is dynamic, there is no type library available.Now the compiler will complain, because late binding is not allowed.
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Aug 26, 2010
I have a simple LINQ query that is going against a collection.
Dim oList = From w In Os
Order By w.ClassTitle Descending
Select w
[code].....
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Apr 8, 2010
I am trying to convert a vb.net project to vb.net project with Option Strict On and I am getting some late binding errors like this :
CODE:
The error appears under pageArray(2).
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Mar 23, 2011
Using Visual Studio 2008 I've built a COM object that targets the .Net Framework 2.0.
I'm trying to use the component in MS Access 2007 on XP SP3. If I use early binding it works flawlessly. If I use late binding I get this error:
Run-time error '429': ActiveX component can't create object
Here's my code:
Dim objTest as Object
Set objTest = CreateObject("MyComNameSpace.MyComClass") 'Error occurs here
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Sep 2, 2009
I'm getting a late binding error message on this specific section of code: objsys.Sessions(shrd.ocSess) Any suggestions as to why I'm getting this late binding error and how to fix it? [Code]
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Aug 14, 2010
So I am taking a stab at converting a large VBA project I'm working into .NET. It's in VBA right now only because of convenience of a database (MS Access). But having stumbled upon VB 2010 Express, I'm seeing what I can do in .NET to make my project even better.To that end, one trick I am doing in the VBA project involves late binding.[code]To provide a simplified example, lets say I have three classes, clsOne, clsTwo, and clsThree. They are themselves similar, and in .NET, I'm actually reducing the code each has due to proper class inheritance. But I need to understand how to move away from late-binding, which I use in the VBA project.Now reading into VB .NET some, I've come across the 'Of' keyword, and this looks like the holy grail that I've been seeking. Please understand that these example is not actual code, and the issue cannot be solved (as far as I know) by fancy inheritance and overloading/overriding.[code]
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Dec 11, 2009
I have strongly typed code which throws a Late binding Disallowed due to Strict On exception. Is there a way to allow late binding, without turning my stict option to off?
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Apr 12, 2010
The question is intended for lazy VB programmers. In vb I can do and I won't get any errors.
Example 1
Dim x As String = 5
Dim y As Integer = "5"
Dim b As Boolean = "True"
[Code]...
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Jul 28, 2010
I have a class from where I need to set objects in another form?
Form1:
vb.net
Function SetMyObject(ByVal frmTarget As Object)
frmTarget.PictureBox1 = Form1.PictureBox1
End Function
(Not tested code, just wrote to show what I mean)So that's the late binding one.I should also say that the frmTarget variable isn't static so thats why I can't make something like Form2.PictureBox1 = Form1.PictureBox1
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Nov 22, 2011
I should convert some code from VB to C#. Given following lines of VB work (I think only because option is not set to strict):
Dim someProp As SomeType
Try
someProp = CType(SomeInstance, Object).SomeProp
' ...
Due to late binding, this code is possible under VB. Of course, following won't work under C#:
SomeType someProp;
try
{
someProp = ((object)SomeInstance).SomeProp;
// ...
How could I formulate something similar under C#?
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Nov 3, 2009
I don't know if it's because I didn't declare something properly or in the proper place.
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
If My.Computer.FileSystem.FileExists(file) Then
[Code].....
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Mar 1, 2012
I like to keep Option Strict On, but in some cases I need late binding.
For example I need to read the value of Geometry.Area when Geometry could be either a Square or a Circle.
It is not my object model, and Square and Circle are not derived nor share an interface that implements the Area property, so I need either a huge Select Case for each geometry type and for each property, or I use late binding.
I tried with this and a few similar variants, but I couldn't get it to work:
Geometry.[GetType]().InvokeMember("Area", Reflection.BindingFlags.GetProperty Or Reflection.BindingFlags.Public Or Reflection.BindingFlags.Instance, Nothing, Geometry, Nothing)
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Jun 16, 2011
I am trying to get some code to compile after switching Option Strict On. However I am using some Interop with VB6 and passing in a form object ByRef so Form.Caption fails and I can't convert it to type Form because a VB.NET Form doesn't have a caption property.
How can I can get the following to compile with Option Strict ON:
Public Sub EditFormLegacy(ByRef objForm As Object)
objForm.Caption = objForm.Caption + " Edited"
End Sub
Is there any way to switch option strict off for specific methods?
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Sep 15, 2011
I have a function where i am opening up an excel doc and spitting some data out to it. I had this working but then needed to make it so that it would work with older versions of excel as well as 2010.
It was suggested on here that i use late binding instead of including the office interop and allow the system select the appropriate version of interop to use.
[Code]...
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Jun 24, 2011
I'm trying to store the "DataType" field value (type System.Type) of a DbDataReader.GetSchemaTable.DataRow to a class field of type System.Type.
[Code]...
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Jun 27, 2012
Im having a problem with the XML in this function and many functions like it.Error XML axis properties do not support late binding.
Namespace
Imports Microsoft.VisualBasic
Imports System.Web
[code]....
seems to be where the error is occurring and I'm not quite sure how to fix it.
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Feb 18, 2011
I'm trying out MVC Scaffolding in a VB.NET MVC3 project and running into an issue with late binding with Option Strict set on (and I want it on).
This works in C#:
public ActionResult Create()
{
ViewBag.PossibleTeams = context.Teams;
[code].....
causes the compiler error Option Strict On disallows late binding. I took a look at the documentation here: [URL] but it wasn't very helpful.
I notice that a new empty application in C# uses the ViewBag in the HomeController but the VB.NET version uses ViewData, so maybe this is a VB.NET limitation.
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Aug 14, 2009
We are working with an existing native application (most likely written in VB) that loads assemblies and calls methods with "Late Binding." We do NOT have access to its source code. We want to implement this interface in C#, and have the native application call our C# assembly. Is this anything we have to do beyond matching the method names and method signatures to make it work?
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Feb 26, 2011
I have a hashtable that stores sports players: key = jersey number, value = an array of information...and what I am trying to do is put this information into combobox (but only showing a certain array elements), so for example say this was the information stored in the hashtable:
(key,{value})
"01",{"john smith","125lbs","qb"}
"02",{"john doe","205lbs","rb"}
so what I have done is created an arraylist that will store the items in the combobox.but my problem happends when I try to loop through the array from the hashtable values.
(playerlisting is the hashtable)
Dim playerlist As New ArrayList
[code]....
The above works, however since it's a foreach loop I cannot specify which array indexes I want to add onto the "listitem" string.
Dim arr As Array = CType(item.Value, Array)
For i = 0 To arr.Length - 1
listitem += arr(i) & " "
Next
But, when I try a simple forloop instead I get a "late binding" error with the 3rd line. Even when I cast the arr(i) as a string I get the error. What needs to be changed?
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Jul 30, 2009
I am new to VB .NET I am having an error:Option strict on disallows late binding, when I execute my script. So I turned off the "option strict off" then I got the error: cannot create activex component, at microsoft.visualbasic.interaction.createobject(string progId,string serverName) what is wrong in this code.
[Code]...
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Apr 12, 2009
"Cannot create ActiveX component" When I run this simple vbscript I get no errors:
Dim doc
set doc = CreateObject("MODI.Document")
msgbox "Task completed."
But when I translate it to vb.Net I get the error above:
Dim doc As Object = CreateObject("MODI.Document")
[Code]...
I tried unregistering the DLL (I know it unregistered because the script stopped working) and then I reregistered it again (whence the script started working again), but I still get the error in VB.Net.
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Jun 14, 2011
My error is option strict doesnot allow late binding
[Code]...
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Aug 17, 2010
I have a VB.NET application which opens Excel and writes data to it. The program works fine in debugging and publishes without problems. The problem I am having is that on some machines the finished program is throwing up the following error: Exception from HRESULT: 0x800A03EC..It happens when the program is trying to communicate with Excel. I am using late binding as this program will role out to our clients and I have no way of knowing what version of Excel they are running.This is the code I am running: (Those variable not in the Dim list are Pubic variables sitting in a seperate module. As I said the code runs fine so I think the problem is the way I am handling Excel)[code]
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Aug 17, 2010
The only advise i have been given is turn option strict off. which i think is a bad ide
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