Object reference not set to an instance of an objec

[jamesa]

Hallo,

I'm facing a strange error when trying to run a little code that normally must be correct. I port this code from c# to vb.net to get the website collection from a SharePoint Portal server.

Running the code get the error description that mentions that "Object reference not set to an instance of an object"

Follow here the code

Imports System
Imports System.ComponentModel
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Xml.Serialization
Imports Microsoft.SharePoint
Imports Microsoft.SharePoint.SPWeb
Imports Microsoft.SharePoint.Utilities
Imports Microsoft.SharePoint.WebPartPages
Imports System.Web.UI.HtmlControls
Imports Microsoft.SharePoint.WebControls
Imports System.Object


    Private Sub sCompileTrail(ByVal objWeb As Microsoft.SharePoint.SPWeb)
        If strTrail.Trim = vbNullString Then
            If objWeb.IsRootWeb  Then
                strTrail = objWeb.Title
            Else
                strTrail = objWeb.Name
            End If
        Else
            If objWeb.IsRootWeb Then
                strTrail = "<a href=" & objWeb.Url & ">" & objWeb.Title & "</a> " & strTrail
            Else
                strTrail = "<a href=" & objWeb.Url & objWeb.Url.ToString & ">" & objWeb.Name & "</a> " & strTrail
            End If
        End If

        If objWeb.ParentWeb.ToString <> vbNullString Then
            sCompileTrail(objWeb.ParentWeb)
        End If
    End Sub



    Public Function fGetWebTree() As String

        Try
            Dim objWeb As SPWeb = Microsoft.SharePoint.WebControls.SPControl.GetContextWeb(Context)
            sCompileTrail(objWeb)

            strTrail = strTrail & "1" & vbCrLf
            If (objWeb.PortalUrl.Trim <> vbNullString) And (objWeb.PortalName.Trim <> vbNullString) Then
                strTrail = "<a href=" & objWeb.PortalUrl & ">" & objWeb.PortalName() & "</a> " & strTrail
            End If
        Catch ex As Exception
            strTrail = "Error! " & ex.Message
        End Try

        fGetWebTree = strTrail
    End Function

the error occures on the "If objWeb.IsRootWeb" check from the sCompileTrail function.


Thanks in advance for your help

[coolbiz]

That seems to indicate that the line:
Dim objWeb As SPWeb = Microsoft.SharePoint.WebControls.SPControl.GetContextWeb(Context)
did not return anything and this is pretty specific to SHAREPOINT. Any SHAREPOINT forum that you can post to?

-Cool Bizs

[jamesa]

Thanks a lot coolbiz,

Your response is the correct answer.
the Dim objWeb As SPWeb = Microsoft.SharePoint.WebControls.SPControl.GetContextWeb(Context)
did not return anything because of the security access setting.
I just change the way to register the Web Part assembly as SafeControl and it works.

Thanks once again