CodeBehind primi problemi

**Daniele80** · 06-05-2003, 15:14

ciao,
è la prima ovlta che utilizzo i codebehind, sto provando del codice che funzionava perfettamente prima.

nella mia pagina.aspx includo il codice cosi:
<%@ Page Language="vb" AutoEventWireup="false" Codebehind="login.aspx.vb" Inherits="laspiaggetta.ViewStateInSessionVar"%>

nel file login.aspx.vb ho questo:

codice:

Imports System.Data.OleDb
Imports System.Data


Public Class ViewStateInSessionVar
    Inherits System.Web.UI.Page
    Protected WithEvents Label1, Label2, Errore As System.Web.UI.WebControls.Label
    Protected WithEvents Button1 As System.Web.UI.WebControls.Button
    Protected WithEvents Nome, Pwd As System.Web.UI.WebControls.TextBox

    Sub Login(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim ObjDatabase As New laspiaggetta.TYASPNET.database()

        ObjDatabase.ConnectionString = "provider=Microsoft.Jet.OLEDB.4.0; data source=" & Server.MapPath("../mdb-database/spaiggetta-db.mdb")

        Dim objReader As OleDbDataReader
        objReader = ObjDatabase.SelectSQL("SELECT id FROM Admin WHERE Nome='" & ObjDatabase.Controlla_Stringa(Nome.Text) & "' AND Pwd='" & ObjDatabase.Controlla_Stringa(Pwd.Text) & "' ")

        If Not objReader Is Nothing Then
            Session("Admin") = "ok"
            Response.Redirect("index.aspx")
        Else
            Errore.Visible = True
            Errore.Text = "ERRORE"
        End If
        objReader.Close()
    End Sub

End Class

mi da errore qui:
objReader.Close()

Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

che vuol dire?

**Daniele80** · 06-05-2003, 15:16

risolto l'errore stava nella stringa del db.

cmq tenetevi pronti che sicuramente tornerò alla carica.

**Daniele80** · 06-05-2003, 17:02

devo fare l'upload di un file e per farlo faccio cosi:

nel mio codicebehind ho questo:

Protected WithEvents fotoP As Web.UI.HtmlControls.HtmlInputFile

codice:

sub inserisci_foto....
  Dim IO_Upload As New laspiaggetta.TYASPNET.Upload()
  Risultato_Upload = IO_Upload.Insert_Immagine(fotoP)
.
.
.

fotoP è nothing perchè?

**flo** · 07-05-2003, 13:28

Io ho usato questo e funziona:

Sub Upload(Source As Object, e As EventArgs)
___
If Not (myFile.PostedFile Is Nothing) Then

_ Dim intFileNameLength as Integer
_ ______Dim strFileNamePath as String
_ ______Dim strFileNameOnly as String___
_ ____________
_ ________'Logic to find the FileName (excluding the path)
_ ________
_____strFileNamePath = MyFile.PostedFile.FileName
_____intFileNameLength = Instr(1,StrReverse(strFileNamePath), "\")
_____strFileNameOnly = Mid(strFileNamePath,(Len(strFileNamePath)-intFileNameLength)+2)
_____myFile.PostedFile.SaveAs("c:\ li tuo path \" & strFileNameOnly)
_lblMsg.Text = "File Upload Success."
__End If
__
__End Sub

<html>
<head>
</head>
<body>
<h3>File Upload</h3>
<form enctype="multipart/form-data" runat="server">
File: <input id="myFile" type="file" runat="server">

<asp:label id="lblMsg" runat="server" />

<input type="button" value="Upload" OnServerClick="Upload" runat="server">

</form>
</body>
</html>

**Daniele80** · 07-05-2003, 17:33

alla fine ho risolto tutto, ora va che è una favola

**Daniele80** · 14-05-2003, 14:24

io nella mia pagina aspx ho questo:
<%@ Page Language="vb" AutoEventWireup="false" Codebehind="login.aspx.vb" Inherits="laspiaggetta.login" %>

qui dentro login.aspx.vb
c'è la classe
Public Class login

ricevo questo:

The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.

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