Find Objects Of A Specific Type In An Object Graph?

Jul 30, 2011

Given an object instance, how can I recurse its members (i.e. the whole object graph) for an object of a specific type, or one that inherits from a specific type?

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Find Complete Object In List Of Objects?

Sep 25, 2011

Is it possible to find a complete object in list of objects?

how to find x in list1 if it exists without comparing a single property like ID ?

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VS 2010 : Find An Object With Certain Attribute Value In A List Of Objects?

Oct 13, 2011

I have a list of objects, each object has a score attribute,The list of scores needs to be combined on the player ID to become a totaled score or series. My current thought process is to For Each through the list of individual games, and add the score attribute to a new list of scores with the same objects. So one list would be like:

clsGame(ID Number, Sore)
dim ScoreList as list(of clsGames)
ScoreList.Add(New clsGame(11, 244)
ScoreList.Add(New clsGame(11, 333)
ScoreList.Add(New clsGame(11, 444)

Then go through combining on like ID's to make a new list of games, that would actually be the series.

Dim SeriesList as new list(of clsClasses)
For each game as clsGame in ScoreList
'cycle through the list of series seeing if an ID matches, if so add the score onto that ID
Else

[code]....

Now I don't know how to add the player if its not in the seiries list without doing a heck of a lot more for each statements. If I add it after the end if then it will be added even if it is in the list..I tried playing around with List.Contains method, but I could only see if it contaned the exact same values i.e

SeiresList.Contains(game)

and because the scores are different (series vs single game) it wouldn't match, and I don't know how to see if it contains an object with just one of the attributes the same...

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VS 2005 Can't Find Where Object Name/type Is Being Set/changed

Feb 10, 2010

This starts with an object being added to a collection with: CommonArgs.Add(ObjName, Me)

ObjName is a string, call it "Obj1". Me is an instance of a class inheriting from UserControl. Call it "Class1".

Now, to check the value assigned to Obj1, the vendor has the

Dim Obj As Object = CommonArgs(ObjName)
Dim Info As System.Reflection.FieldInfo = Obj.GetType().GetField(ObjName, System.Reflection.BindingFlags.Public Or System.Reflection.BindingFlags.Instance Or System.Reflection.BindingFlags.IgnoreCase)
Obj is the Class1 object added to CommonArgs.

When I run this in my test app, Info is Nothing-but when I run it in the vendor's app Info is an Enumerated type. Why?

I've found a little more info, but it's still a mystery to me-and so far it appears to be a mystery to everybody else, too.

First, I noticed that I didn't mention that the Collection is a Hashtable. I don't know if that would make a difference, but it is something I forgot to mention.

Second, there's a 'regular' variable named ObjName that contains the value being returned by Info. My understanding is that there's no connection between these, e.g. Dim X as Integer = 1 doesn't change the type or value of the object of CommonArgs("X"). But that's what appears to be happening.

Any suggestion?

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Determine Which Object In An Object Graph Caused A SerializationException?

Jan 12, 2011

I'm deserializing an object and in certain cases it works fine, however in others it fails. The exception is essentially meaningless to me, but there has to be a way to figure out where exactly it failed so i redirect my debugging.

[Code]...

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Sql - Error The SqlParameterCollection Only Accepts Non-null SqlParameter Type Objects, Not Int32 Objects?

Jun 23, 2012

I am getting this error, Not sure why it is happening "Error The SqlParameterCollection only accepts non-null SqlParameter type objects, not Int32 objects."I have tried with all sorts of possibilties, now try to enter default data as dummy data,

Using connection As New SqlConnection
connection.ConnectionString = ConfigurationManager.ConnectionStrings("DentalDeviceConnectionString").ConnectionString
connection.Open()[code].....

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The SqlParameterCollection Only Accepts Non-null SqlParameter Type Objects Not String Objects?

Jan 18, 2012

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Using conn As New SqlConnection("Database=Clinic_Management_System;Data Source=.SQLExpress;Integrated Security=True;AttachDBFilename=|DataDirectory|Clinic Management System.mdf")
Dim cmdRecord As SqlCommand

[code]....

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Random Objects - Let The User Input Objects To A Richtextbox 1 Object On Each Line?

Jan 6, 2011

I want to let the user input objects to a richtextbox 1 object on each line, and somehow use Random.Next to select pseudorandomly a few objects, the number 'few' inputted in a textbox.

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VB 2008 - How To Create Graph And Find Out Top Value

Jun 22, 2009

I am now using VB2008 + MS Access 2007 to complete a small applicaiton.I was make use of access 's information to export the information from Access to the vb's database. I had completed the function of search the stock. However, I don't know how to create the chart in Visual Basic 2008 express version. I have downloaded the MS Chart, but I don't know how to make use of it. My objective is creating the chart that can search from month to month. Of course, the data will be updated monthly. My second question is how to build up the query that can search the top value in the Visual Basic. I know how to create in the MS Access. But I want to create the top value that can be change in visual basic, such as sometimes 10,20 or 30. Or I need to create in the MS Access, but not the VB 2008??

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Unable To Cast Object Of Type <object> To Type <same Object>

May 7, 2009

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

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

I have an inherited TreeView with an inherited class called DynamicTreeNode inside it. I am trying to loop through the DynamicTreeNodes in the TreeView.Nodes property which is causing this error.

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Find A Specific File In A Specific Directory?

Feb 20, 2011

I am trying to find a specific file in a specific directory and then i need to get the full path of the file.Is this possible i cant find any help topics about a specific file.

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VMWare Specific Or Perhaps The Type Of Install Specific?

Apr 27, 2010

Strange story... I downloaded VMWare but it has since advised of an available update. I downloaded the update and when I click to install it, a window comes up with VB Code from a project I created a while back in a completely separate folder from this install file. I then tried downloading the trial of VMWare Workstation and when running the installer it shows the same thing. I don't know of anyway to contact VMWare support since I don't pay for any services or products and all there is available is a FAQ type section. Of course this problem would not be in there, nor can I find any such related issue online. his is VMWare specific or perhaps the type of install specific. I have no other issues with any other app installations other than with VMWare installations.

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VS 2010 - Unable To Cast Object Of Type 'System.String' To Type 'System.Object[]'

Jan 25, 2011

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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VBA Code - Syntax To Ascertain If A Chart / Graph / Object Is Positioned Over Data Cells

May 26, 2012

Anyone have VB.Net or VBA code to ascertain if an Excel Object is positioned over (Hiding) spreadsheet data?I have code to create/position a chart object. Where would I begin to determine if there is data "under" an object.

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Rotating Specific Objects With GDI+?

May 9, 2011

I'd like to rotate only one of the shapes in an animation, but the rotatetransform method applies this rotation to the whole view. I have several shapes which I want to remain stationary, and just one that should be rotated. I've been trying to use containers but so far this hasn't helped. This is visual basic on XP, using .net gdi+, system.drawing. I'm using translatetransform to establish a rotation center.

Private Sub ellipse()
myBuffer.Graphics.Clear(Color.White)
myBuffer.Graphics.TranslateTransform(200, 400)
If plus_clicked Then

[code]....

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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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Unable To Cast Object Of Type 'System.Object[]' To Type 'System.String[]'

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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Compare Specific Properties Within Two Objects?

Sep 14, 2010

I am trying to compare specific properties within two objects. Example:I want to compare the Last Name, Age, and Sex of two people (Person1 and Person2).

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Asp.net - Unable To Cast Object Of Type 'ASP.webform1_aspx' To Type 'System.Web.UI.WebControls.Button'

Jan 28, 2012

when view in browser, i got this error: Unable to cast object of type 'ASP.webform1_aspx' to type 'System.Web.UI.WebControls.Button'.

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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Unable To Cast Object Of Type 'ADODB.InternalField' To Type 'System.String

Apr 19, 2010

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

dim Temp as string
Temp = Recordset("
Table_Field")

but, when I start Debugging the error messages "Unable to cast object of type 'ADODB.InternalField' to type 'System.String"

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Unable To Cast Object Of Type 'IMAPI2FS.FsiStreamClass' To Type 'IMAPI2.IStream'

Apr 13, 2011

I am implementing IMAPI2 into my vb.net project but ran into a wall. I am getting the message Unable to cast object of type 'IMAPI2FS.FsiStreamClass' to type 'IMAPI2.IStream' when trying to start the burn. I googled around and found this is something that microsoft hasn't fixed.. which basically renders IMAPI2 useless in vb.net.

I found a post on codeproject.com by eric hadden who combined the IMAPI2.dll and IMAPI2fs.dll into an c# interop file. I also see the IBURN interop in microsoft SDK samples. I'd like to use either, but it's in c# and I'm using vb express. Does anyone know a way to get the interop into visual basic or a way around "Unable to cast object of type 'IMAPI2FS.FsiStreamClass' to type 'IMAPI2.IStream'"?

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Unable To Cast Object Of Type 'System.IO.FileStream' To Type 'Excel.Application'

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).

The error I get is "Unable to cast object of type 'System.IO.FileStream' to type 'Excel.Application'." in line 14 of the code below.

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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Unable To Cast Object Of Type 'System.String' To Type 'ADODB.Connection'

Mar 19, 2009

I'm new to VB 2005, the code below is actualy coded from VB 6 and just converted it to VB 2005. I'm having trouble with line that's on bold letters.In VB 6 this works just ok. By the way the error message is "Unable to cast object of type 'System.String' to type 'ADODB.Connection'." [code]

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Error : Unable To Cast Object Of Type 'ClassA' To Type 'ClassB'

May 24, 2011

I can't cast my objects. I get: "Unable to cast object of type 'ClassA' to type 'ClassB'".

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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Unable To Cast COM Object Of Type 'System.__ComObject' To Class Type?

May 14, 2009

Unable to cast COM object of type 'System.__ComObject' to class type 'rjsDocMan.Folder'.Instances of types that represent COM components cannot be cast to types that do not represent COM components; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface.The code where it is flagging the error is:

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

[code].....

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Unable To Cast Object Of Type 'SZArrayEnumerator' To Type 'WindowsApplication1.myEnumerator'

Dec 18, 2009

I saw this thread and I had simple answer in mind. To use custom enumerator class. So I was trying to make one for that guy, which would have one more property to check whether its has reached end or not. It would also provide current position.I'm getting an error "Unable to cast object of type 'SZArrayEnumerator' to type 'WindowsApplication1.myEnumerator'." at the line 6 [see below].However, return type of values.getEnumerator says its IEnumerator. [code]

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Unable To Cast Object Of Type .objectquery To Type Generic.list

Sep 12, 2011

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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Unable To Cast Object Of Type X To Type X On Setting DataSource To A Table?

Feb 19, 2012

Columns 0 & 1 are filled from a DataAdapter from Access Database and three are added. I had this working, but I changed it to check for the column "Feed" so I could add several Locations. At first this worked,but I did someething in perfecting it and it now fails after filling the first row of the datagridview (dgvFdMed).I ran a check and the table LotsTab has 8 rows filled. Column 1 & 2 are strings and the database appears they are fine. The added columns have just been created with no value. My plan is to enter the values and then use the data from the grid.

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

[code]....

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VS 2008 Unable To Cast Object Of Type FrmChild1 To Type FrmChild2

Dec 8, 2010

I have 2 Child forms inside a parent. For example, FrmChild1 contains a "Friend Sub" I wish to call.I would like one of the child forms to call that sub from another child form (we will call it FrmChild2. The following code works, but when it's done going through the "For Each", I get a "Invalid Cast"

' THIS CODE IS IN FrmChild1
For Each mFrmChild2 As FrmChild2 In FrmParent.MdiChildren
mFrmChild2.GuestRefresh(False)
Next

Error after calls are made:"Unable to cast object of type FrmChild1 to type FrmChild2.

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Asp.net - No Mapping Exists From Object Type System.String[] To A Known Managed Provider Native Type?

Jan 27, 2012

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()
'conn1.ConnectionString = ConfigurationManager.ConnectionStrings("Data Source=win2008-2;Initial Catalog=h1tm11;User ID=sa;

[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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