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Problem passing array(list) to custom server control

Posted on 2007-11-20
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Last Modified: 2008-02-01
I tried making a full custom server control and somehow after giving it values through the aspx web app, the array is null.
Private mStoreArray As Array
 
    Public Property StoreArray() As Array
        Get
            Return mStoreArray
        End Get
        Set(ByVal value As Array)
            mStoreArray = value
        End Set
    End Property
 
Dim i As Short
        For i = 0 To StoreArray.Length - 1
            output.RenderBeginTag(HtmlTextWriterTag.Tr)
            output.RenderBeginTag(HtmlTextWriterTag.Td)
            output.Write(StoreArray(i))
            output.RenderEndTag()
            output.RenderEndTag()
        Next

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Question by:Sharalynn
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5 Comments
 
LVL 3

Expert Comment

by:john_steed
ID: 20322412
Hi,

I'm assuming the code below is contained in a render function
       For i = 0 To StoreArray.Length - 1
            output.RenderBeginTag(HtmlTextWriterTag.Tr)
            output.RenderBeginTag(HtmlTextWriterTag.Td)
            output.Write(StoreArray(i))
            output.RenderEndTag()
            output.RenderEndTag()
        Next

So you need to make sure you've filled the array BEFORE this executes, also after a postback the array is empty, so you need to fill it again or store it in the viewstate

hope this helps
0
 

Author Comment

by:Sharalynn
ID: 20325234
Hi,

Yes that code is contained in the RenderContents method, and I have previously tried to populate the array on Page_Load in my testWebsite. The objArray.Length executed here indeed returns  So what is wrong here?
 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
   Dim dataList As String
        Dim MCListBox As New MCListBox.MCListBox
        Dim objArray As Array
        dataList = "1;Storage;2;Database;3;" & _
        "Security;4;JavaScript;5;Web Programming;6;" & _
        "Networking"
        objArray = dataList.Split(";")
        PagedListBox.StoreArray = objArray
End Sub

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LVL 3

Expert Comment

by:john_steed
ID: 20326023
Hi,

Try putting a breakpoint on where you fill the array and where you use it to populate the control. If the control renders first, fill it in Page_Init instead

Hope this helps

Cheers
0
 

Author Comment

by:Sharalynn
ID: 20326909
Hi, I've checked and the flow is accordingly to the way it is supposed to be at least for the Page_Load, but after that all goes bonkers.
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LVL 3

Accepted Solution

by:
john_steed earned 1500 total points
ID: 20330148
Still no luck ?

when you place a breakpoint on where you fill the property StoreArray()
and one where you loop through it, you can see if the property get filled before you loop through it. If this is the case it should function properly.
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