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Thread: [RESOLVED] VB.Net > ASP - What I thought should work, isn`t

  1. #1

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    Resolved [RESOLVED] VB.Net > ASP - What I thought should work, isn`t

    Hi

    I need a pointer in the right direction or I think I just wont bother messing with .net.... sigh

    Code:
    		Response.Write("<p>jeito 1</p>")
    
    		'assume that the order of the elements is generated properly
    		'so that there is a 'tree' of elements to build
    		Dim dOrder As New Stack
    		Dim objOpenOrder(2000) As clsHtmlElement
    		Dim aParents(2000) As String
    		Dim lngWhichNivel As Long
    		Dim lngOpenOrder As Long
    		Dim lngOpenCtrl As Long
    		Dim lngCtrl As Long
    		Dim sRes As New StringBuilder
    
    		lngOpenOrder = 0
    		lngWhichNivel = 1
    		cForm.setTheNivel(lngWhichNivel)
    		objOpenOrder(lngOpenOrder) = cForm
    		aParents(lngOpenOrder) = ""
    
    		lngOpenOrder += 1
    		lngWhichNivel = 2
    		cDiv.setTheNivel(lngWhichNivel)
    		cDiv.setParentHtmlId(cForm.getTheID())
    		objOpenOrder(lngOpenOrder) = cDiv
    
    		lngOpenOrder += 1
    		lngWhichNivel = 3
    		cLbl.setTheNivel(lngWhichNivel)
    		cLbl.setParentHtmlId(cDiv.getTheID())
    		objOpenOrder(lngOpenOrder) = cLbl
    
    		lngOpenOrder += 1
    		cDiv2.setParentHtmlId(cDiv.getTheID())
    		cDiv2.setTheNivel(lngWhichNivel)
    		objOpenOrder(lngOpenOrder) = cDiv2
    
    		If lngOpenOrder > 0 Then
    			lngCtrl = 0
    			Response.Write(objOpenOrder(lngCtrl).htmlStart())
    			dOrder.Push(lngCtrl)
    
    			For lngCtrl = 1 To lngOpenOrder
    
    				If objOpenOrder(lngCtrl).getTheNivel() < objOpenOrder(dOrder.Peek()).getTheNivel() Then
    					Do While objOpenOrder(lngCtrl).getTheNivel() < objOpenOrder(dOrder.Peek()).getTheNivel()
    						lngOpenCtrl = dOrder.Pop()
    						Response.Write(objOpenOrder(lngOpenCtrl).htmlEnd())
    					Loop
    				Else
    
    					If objOpenOrder(lngCtrl).getTheNivel() = objOpenOrder(dOrder.Peek()).getTheNivel() Then
    						lngOpenCtrl = dOrder.Pop()
    						Response.Write(objOpenOrder(lngOpenCtrl).htmlEnd())
    					End If
    				End If
    
    				If lngCtrl <= lngOpenOrder Then
    					Response.Write(objOpenOrder(lngCtrl).htmlStart())
    					dOrder.Push(lngCtrl)
    				End If
    
    			Next
    
    		End If
    
    		'should be one open class minimum
    		'any open classes...
    		lngOpenCtrl = dOrder.Pop()
    		Response.Write(objOpenOrder(lngOpenCtrl).htmlEnd())
    		If (lngOpenCtrl > 0) Then
    			Do Until objOpenOrder(lngOpenCtrl).getTheNivel() <= 1
    				lngOpenCtrl = dOrder.Pop()
    				Response.Write(objOpenOrder(lngOpenCtrl).htmlEnd())
    			Loop
    		End If
    This is a first attempt at using vb.net coming from an MS Access/VBA background with a little experience in VB6. Currently using Java/JSP at work.

    I managed to create the base class and use new classes extending that.
    But I am trying to hold objects of the classes in an array and I thought if I declared the array of the base class I could use any object based off of it. Apparently not as when running with a debug, and using the immediates window it is returning some weird stuff or using the methods of the base instead of the class. So I have obviously got it all wrong...

    So.... what to do?

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    If I post a lot, it is because I am bored at work! ;D Or stuck...
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  2. #2
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    Re: VB.Net > ASP - What I thought should work, isn`t

    have you tried using a list of <T> (where <T> is your object)?
    second place is just the first loser...

  3. #3

    Thread Starter
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    Re: VB.Net > ASP - What I thought should work, isn`t

    Can I use the base class as T though ?

    BOFH Now, BOFH Past, Information on duplicates

    Feeling like a fly on the inside of a closed window (Thunk!)
    If I post a lot, it is because I am bored at work! ;D Or stuck...
    * Anything I post can be only my opinion. Advice etc is up to you to persue...

  4. #4
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    Re: VB.Net > ASP - What I thought should work, isn`t

    yes in VB its
    Code:
    dim x as List(of MyObj)
    
    ' to get things out
    for each y as MyObj in x
    y.firstproperty...
    next
    second place is just the first loser...

  5. #5

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    Re: VB.Net > ASP - What I thought should work, isn`t

    I'll post the code later on, but I updated to use that list dropping in my base class.
    Still didn't like it.
    I think I'm missing something or perhaps I just need to use Object ?

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  6. #6
    Fanatic Member PlausiblyDamp's Avatar
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    Re: VB.Net > ASP - What I thought should work, isn`t

    Quote Originally Posted by Ecniv View Post
    I'll post the code later on, but I updated to use that list dropping in my base class.
    Still didn't like it.
    I think I'm missing something or perhaps I just need to use Object ?
    You virtually never need to use Object, if you have a base class you are inheriting from have you marked the methods in the base class as Overridable and in the derived classes used the Overrides keyword?

  7. #7

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    Re: VB.Net > ASP - What I thought should work, isn`t

    Code:
     
    		Dim dOrder As New Stack
    		Dim objOpenOrder As New List(Of clsHtmlElement)
    		Dim aParents(2000) As String
    		Dim lngWhichNivel As Long
    		Dim lngOpenOrder As Long
    		Dim lngOpenCtrl As Long
    		Dim lngCtrl As Long
    		Dim sRes As New StringBuilder
    
    		lngOpenOrder = 0
    		lngWhichNivel = 1
    		cForm.setTheNivel(lngWhichNivel)
    		objOpenOrder.Add(cForm)
    		aParents(lngOpenOrder) = ""
    
    		lngOpenOrder += 1
    		lngWhichNivel = 2
    		cDiv.setTheNivel(lngWhichNivel)
    		cDiv.setParentHtmlId(cForm.getTheID())
    		objOpenOrder.Add(cDiv)
    Ah hmm ... no and yes.

    I use the overrides on the child class...

    easier if I post the code for the classes...
    Base Class :
    Code:
    Imports Microsoft.VisualBasic
    
    Public Class clsHtmlElement
    
    	Private useVersion As Long
    	Private lngNivel As Long
    	Private strTheId As String = ""
    	Private strTheName As String = ""
    	Private strTheText As String = ""
    	Private strTheLink As String = ""
    	Private strTheTitle As String = ""
    	Private strTheStyle As String = ""
    	Private strClassName As String = ""
    	Private strParentID As String = ""
    
    	Public Sub New()
    		useVersion = 1
    	End Sub
    
    	Public Function getTheNivel() As Long
    		getTheNivel = lngNivel
    	End Function
    
    	Public Sub setTheNivel(l As Long)
    		lngNivel = l
    	End Sub
    
    	Public Function getUseVersion() As Long
    		Return useVersion
    	End Function
    
    	Public Sub setUseVersion(l As Long)
    		useVersion = l
    	End Sub
    
    	Public Function getTheID() As String
    		Return strTheId
    	End Function
    
    	Public Sub setTheID(s As String)
    		strTheId = s
    	End Sub
    
    	Public Function getName() As String
    		Return strTheName
    	End Function
    
    	Public Sub setName(s As String)
    		strTheName = s
    	End Sub
    
    	Public Function getText() As String
    		Return strTheText
    	End Function
    
    	Public Sub setText(s As String)
    		strTheText = s
    	End Sub
    
    	Public Function getLink() As String
    		Return strTheLink
    	End Function
    
    	Public Sub setLink(s As String)
    		strTheLink = s
    	End Sub
    
    	Public Function getClassName() As String
    		Return strClassName
    	End Function
    
    	Public Sub setClassName(s As String)
    		strClassName = s
    	End Sub
    
    	Public Function getTheTitle() As String
    		Return strTheTitle
    	End Function
    
    	Public Sub setTheTitle(s As String)
    		strTheTitle = s
    	End Sub
    
    	Public Function getTheStyle() As String
    		Return strTheStyle
    	End Function
    
    	Public Sub setTheStyle(s As String)
    		strTheStyle = s
    	End Sub
    
    	Public Function htmlStart() As String
    		Return ""
    	End Function
    
    	Public Function htmlEnd() As String
    		Return ""
    	End Function
    
    	Public Function getParentHtmlId() As String
    		Return strParentID
    	End Function
    
    	Public Sub setParentHtmlId(s As String)
    		strParentID = s
    	End Sub
    End Class
    a child class
    Code:
    Imports Microsoft.VisualBasic
    
    Public Class clsLabel
    
    	Inherits clsHtmlElement
    
    	Private strForId As String
    
    	Public Function getForId() As String
    		Return strForId
    	End Function
    
    	Public Sub setForId(s As String)
    		strForId = s
    	End Sub
    
    
    	Public Overloads Function htmlStart() As String
    		Dim sRes As New StringBuilder
    
    		sRes.Append("<label")
    		If (getTheID().Length > 0) Then sRes.Append(" id=" + Chr(34) + getTheID() + Chr(34))
    		If (getName().Length > 0) Then sRes.Append(" name=" + Chr(34) + getName() + Chr(34))
    		If (getTheID().Length > 0) Then sRes.Append(" for=" + Chr(34) + strForId + Chr(34))
    		sRes.AppendLine(">" + getText())
    
    		Return sRes.ToString()
    	End Function
    
    	Public Overloads Function htmlEnd() As String
    		Return "</label>"
    	End Function
    
    End Class

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    * Anything I post can be only my opinion. Advice etc is up to you to persue...

  8. #8
    Fanatic Member PlausiblyDamp's Avatar
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    Re: VB.Net > ASP - What I thought should work, isn`t

    Ah, you are Overloading not overriding, there is a big difference.

    If you have methods in a base class that you want a derived class to be able to replace then the base class needs to mark them as overridable (similar to virtual in Java), the derived class then needs to mark it's implementation as overrides to get the polymorphic behaviour you want.

  9. #9
    Super Moderator si_the_geek's Avatar
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    Re: VB.Net > ASP - What I thought should work, isn`t

    You've actually used Overloads rather than Overrides, and they are different.

    Overloads allows you to create multiple routines with the same name, but using different parameter lists (so they can be used as a more efficient version of Optional parameters). This would be useful if you wanted to have variations of the routine at the same level, but it isn't what you want here.

    Overrides is to allow you to replace the inherited routine, which is what you want here.

    So, clsHtmlElement should have these changes:
    Code:
    	Public Overridable Function htmlStart() As String
    		Return ""
    	End Function
    
    	Public Overridable Function htmlEnd() As String
    		Return ""
    	End Function
    ...and clsLabel should have these changes:
    Code:
    	Public Overrides Function htmlStart() As String
    ...
    	Public Overrides Function htmlEnd() As String
    edit: I should have refreshed the page, oops!

  10. #10

    Thread Starter
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    Re: VB.Net > ASP - What I thought should work, isn`t

    Thanks.
    That makes sense. I'll have a go tonight and post back when it breaks .. or if it works

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    If I post a lot, it is because I am bored at work! ;D Or stuck...
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  11. #11

    Thread Starter
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    Re: VB.Net > ASP - What I thought should work, isn`t

    Hi

    Thank you for the assist. I changed the overidable and overrides parts and once I`d updated all the classes, actually works

    I`ll post up with more woes later on when I`ve got to the next problem

    night all!

    BOFH Now, BOFH Past, Information on duplicates

    Feeling like a fly on the inside of a closed window (Thunk!)
    If I post a lot, it is because I am bored at work! ;D Or stuck...
    * Anything I post can be only my opinion. Advice etc is up to you to persue...

  12. #12
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    Re: VB.Net > ASP - What I thought should work, isn`t

    Quote Originally Posted by Ecniv View Post
    Hi
    I`ll post up with more woes later on when I`ve got to the next problem
    remember, if debugging is the science of taking the bugs out.

    programming is the art of putting them in
    second place is just the first loser...

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