Casting Early Bound Object Type Into Late Bound Object Type?

Jul 5, 2010

I've got a piece of code in a project (MyProject) that contains early bound object from a referenced assembly (We'll call it CommonAssembly):

Dim myObject As CommonAssembly.MyEarlyBoundType

now I have another assembly that is dynamically loaded because it is not present in all projects:

Dim myLateBoundObject As Object = AppDomain.CurrentDomain.CreateInstanceAndUnwrap("Utils", "Utils.MyLateBoundType")
MyLateBoundType derives from CommonAssembly.MyEarlyBoundType, and I want to cast myObject to myLateBoundObject and then programmatically invoke the additional

[Code].....

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I have a datagridview that is bound to a list object of a custom type via a BindingSource. From everything I've read, I should be able to click the column headers and the rows sort, This doesn't happen for me. Sortmode is set to automatic and the column headers aren't set to be used for selection so it should work.

I know that I could sort progamatticly but that seems a little bit of a waste given that I should just be able to do it by default.

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I have written a small program to aide my business and the program works fine. But while compiling the code it shows a lot of warnings like the following."late bound resolution; run time errors may occur""implicit conversion from 'Object' to 'String'." Where am i going wrong. Even though the options strict off removes the warning I want to correct the warnings.

Private Function ledgerMasterFullName(ByVal i As Integer) As String
Dim fullName As String
Dim vObj As Object

[code]....

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This error makes no sense to me[code]...

Unable to cast object of type 'DynamicTreeNode' to type 'DynamicTreeNode'.

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For I = 0 To 10
If Items.Count = 0 Then Exit For
Dim T As New Thread(AddressOf Thread)
T.Start(New Object() {"Test", "Test"})

[code]....

When I put same code in empty project it works.

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Apr 5, 2009

i always get this error when i tried to update my table: Unable to cast object of type 'System.Object[]' to type 'System.String[]'.

i only want to update STATUS, ENDTIME, and PRICE

the data type of each field are:
STATUS = nvarchar
ENDTIME = smalldatetime
PRICE = money

[Code]....

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You can even put breakpoints in!

@#%ing amazing. Top marks to Microsoft. I don't know if this is by design, or a side effect of how the debugger works, but I don't care because it makes writing late bound projects so much friendlier.

OK Cor, you can go ahead and rubbish late-binding now.

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how should i solve this problem?

Line 7: If Not Page.IsPostBack Then
Line 8: Dim rowIndex As Integer = 0
<b>Line 9: Dim btn As Button = DirectCast(sender, Button)</b>

[Code].....

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Apr 19, 2010

I had write code (just for learning), the codes :

dim Temp as string
Temp = Recordset("
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Jun 1, 2009

I'm having a problem with converting from one source type to a destination type. I have a form with 2 buttons (button 2 uses the OpenFileDialog to have the user open an excel file set to NewFile),(button 1 takes the contents from specific cells in NewFile and arranges them how I need into oXLApp1).

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Public Class Form1
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

[Code]....

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Mar 19, 2009

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The service Class:

Public Class svc_Insp
Implements Isvc_Insp
Public Function Test(ByVal pm_income As ClassC) As String Implements Isvc_Insp.Test

[code]....

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May 14, 2009

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<div style="color: Black; background-color: White;">
treeview += AddChildren(Session("DocMan").RootFolder)
</div>

[code].....

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I have a question about ASP.Net, visual basic I have 2 LINQ query's, the first one works, the second one doesnt, produces a

"Unable to cast object of type 'System.Data.Objects.ObjectQuery'1[SelmaV2.Products]' to type 'System.Collections.Generic.List'1[System.String]'.

[Code]....

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Feb 19, 2012

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Private Sub sfillGrid(ByVal Loc As String)
Dim i As Integer
Dim column As DataGridViewColumn

[code]....

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' THIS CODE IS IN FrmChild1
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mFrmChild2.GuestRefresh(False)
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I am getting this error No mapping exists from object type System.String[] to a known managed provider native type.The code is

Dim conn1 As SqlConnection
conn1 = New SqlConnection("Data Source=win2008-2;Initial Catalog=h1tm11;User ID=sa;Password=#1cub3123*;Persist Security Info=True;")
' Dim conn1 As String = ConfigurationManager _ .ConnectionStrings("Connectionstring").ConnectionString()
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[code].....

the error occurs at adapter.Fill(table)

Dim addressstring1 As String = txtpostcode.Value.Trim()
Dim addressstring() As String = Split("addressstring1", ",", 1)

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Dec 22, 2010

I have a series of API calls that are returning J# data types. I have been able to convert most of the data types (Integer, Boolean, Double, Float, etc) just fine.What I need to do now is convert a java.Util.Collection to a VB .NET collection (ArrayList)

Here is my attempt:

Public Function MakeDotNETCollection(ByVal javaCol As java.util.Collection) As Collection
Dim dotNetCol As Collection

[code]....

I keep getting a runtime error "Unable to cast object of type 'AbstractListlistIterator' to type 'System.Collections.IEnumerator.

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I am building a software which will be used to create a remote desktop connection. However I'm getting this error:

Unable to cast COM object of type 'System.__ComObject' to interface type 'MSTSCLib.IMsTscNonScriptable'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{C1E6743A-41C1-4A74-832A-0DD06C1C7A0E}' failed
due to the following error: Δεν υποστηρίζεται τέτοια διασύνδεση (Exception from HRESULT: 0x80004002 E_NOINTERFACE)).

[Code]...

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VS 2008 : Error - Unable To Cast Object Of Type 'ObjectCollection' To Type 'System.Array'

Feb 24, 2012

I am using a background worker and am attempting to use the following code. However I keep getting this error on i "Unable to cast object of type 'ObjectCollection' to type 'System.Array'."

Private Sub btnVerify_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnVerify.Click
myArray = listProxies.Items()
BackgroundWorker1.RunWorkerAsync()
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[code]....

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Apr 19, 2009

I have some code and there are 2 errors which I don't understand I have tried all sorts...

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2)Function 'GetNewPhrase' doesn't return a value on all code paths. A null reference exception could occur at run time when the result is used.

I can't get it to work..

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Mar 12, 2009

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Private Sub ScanForEmpty(ByRef vFolder As String)
Dim nSize As Integer
System.Windows.Forms.Application.DoEvents()
If bExit Then Exit Sub

[code]....

I get this message at the bottom:Warning5 The type for variable 'FolderObj' will not be inferred because it is bound to a field in an enclosing scope. Either change the name of 'FolderObj', of use the fully qualified name (for example, 'Me.FolderObj' or 'MyBase.FolderObj').

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I think the biggest things I'm not understanding are:

1) How do you make the DataGridView perform additions, deletions, and edits on an object.

2) How do you program your object to handle additions, deletions, and edits. Do you just need methods that use ADO.Net, NHibernate, or Linq to SQL (or any other CRUD handling mechanism)?

3) How to make this filterable and sortable.

Is this overly difficult to do or why am I have so much trouble finding examples for this?

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May 19, 2009

I have a DataGridView object to which I've bound a list of objects (of type Asset) returned from a database query.I'm programming in VB using Visual Studio 2005.I want to grab two copies of the bound object (calling them oldAsset and newAsset) from the selected row in the DataGridView, update newAsset based on input from other controls on the form, and pass both oldAsset and newAsset to a function that will update the appropriate record in the DB.I try to grab the two copies like this:

Dim currentRow As DataGridViewRow = Me.AssetDataGridView.CurrentRow
Dim newAsset As Asset
newAsset = currentRow.DataBoundItem

[code]....

Opening a watch window on oldAsset and newAsset indicates that the appropriate values are pulled at this point. But when I try to change a property of just newAsset, like

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Dec 14, 2011

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EDIT: Okay, thanks to dasblinkenlight's answer below, I can detect when this circumstance is occurring, but what I need to do now is to take a type <T> which I know is Nullable(Of SomeClass), get a type reference to SomeClass and then create a new object of type Nullable(Of SomeClass) and assign that to LoadData.My problem was that I had a lot of difficulty in finding any function which would accept baseType as an actual Type.Parse accepted baseType as a parameter, I knew baseType was an [Enum] type because of dasblinkenlight's code, so I was, in this instance, able to code a solution. It's a solution which is very specific to my problem (i.e., T is Nullable(of SomeEnumeration)), but it's a solution nonetheless.

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Nov 9, 2009

I have given reference to Microsoft HTML in COM (am using VB 2008)

"Unable to cast object of type 'System.Windows.Forms.HtmlElement' to type 'mshtml.IHTMLElement'."

I want to retrieve all the properties like the class name, html id of every object in the web browser. I am getting the above exception when i try to direct cast it.[code]...

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