Hi,
when I try to test the web service LoginService.asmx
(http://localhost/mono/LoginService.asmx), the method "Login" and "LogOut" go
well, instead "TestLogin" give me only this message:
---------------------
The remote server returned an error: (500) Internal Server Error.
Object reference not set to an instance of an object
----------------------
If I try to test a client application (WebForm1LoginClient.aspx) that invoke
the
method "Login"of the LoginService.asmx I get this error:
------------------------------------
Server error in '/mono' application
Description: Error processing request.
Error Message: HTTP 500.
Stack Trace:
System.Web.Services.Protocols.SoapException: Object reference not set to an
instance of an object
in <0x00528>
System.Web.Services.Protocols.SoapHttpClientProtocol:ReceiveResponse
(System.Net.WebResponse,System.Web.Services.Protocols.SoapClientMessage,System.Web.Services.Protocols.SoapExtension[])
in <0x00080> (wrapper remoting-invoke-with-check)
System.Web.Services.Protocols.SoapHttpClientProtocol:ReceiveResponse
(System.Net.WebResponse,System.Web.Services.Protocols.SoapClientMessage,System.Web.Services.Protocols.SoapExtension[])
in <0x002a4> System.Web.Services.Protocols.SoapHttpClientProtocol:Invoke
(string,object[])
in <0x0006f> (wrapper remoting-invoke-with-check)
System.Web.Services.Protocols.SoapHttpClientProtocol:Invoke (string,object[])
in <0x00037> localhost.LoginService:TestLogin ()
in <0x0019d> LoginClient.WebForm1:ButtonLogin_Click (object,System.EventArgs)
in <0x0006a> (wrapper delegate-invoke)
System.MulticastDelegate:invoke_void_object_EventArgs
(object,System.EventArgs)
in <0x00090> System.Web.UI.WebControls.Button:OnClick (System.EventArgs)
in <0x00058>
System.Web.UI.WebControls.Button:System.Web.UI.IPostBackEventHandler.RaisePostBackEvent
(string)
in <0x00016> System.Web.UI.Page:RaisePostBackEvent
(System.Web.UI.IPostBackEventHandler,string)
in <0x0003a> System.Web.UI.Page:RaisePostBackEvents ()
in <0x002ab> System.Web.UI.Page:InternalProcessRequest ()
in <0x000c2> System.Web.UI.Page:ProcessRequest (System.Web.HttpContext)
in <0x002e8> ExecuteHandlerState:Execute ()
in <0x00084> StateMachine:ExecuteState
(System.Web.HttpApplication/IStateHandler,bool&)
------------------------------------
How to work with SessionState,(System.Web.SessionState) and System.Net?
Thanks,
Valentina.
>Scrive Tom Larsen <[EMAIL PROTECTED]>:
>
> Exceptions are marshalled across application domains. What is the the
> exception type, Exception.Message, Exception.StackTrace?
>
> Tom Larsen
>
> On Mon, 19 Jul 2004 [EMAIL PROTECTED] wrote:
>
> >
> >
> > Please help me!
> >
> > This example of Web Service run with success on Windows with VisualStudio
> and
> > IIS, but when I try to run on Linux (FC2) with Mono (Beta1),I get this
> error :
> > "The remote server returned an error: (500) Internal Server Error.
> > Object reference not set to an instance of an object"
> >
> >
> > The method that gives problem is TestLogin......Why? Which is the correct
> > solution?
> >
> > WebService code is :LoginService.asmx.cs
> >
> >
> > Thanks,
> >
> > Valentina.
>
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Web;
using System.Web.Services;
using System.Data.Odbc;
namespace LoginService
{
public class LoginService : System.Web.Services.WebService
{
public LoginService()
{
InitializeComponent();
}
#region Component Designer generated code
//Required by the Web Services Designer
private IContainer components = null;
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if(disposing && components != null)
{
components.Dispose();
}
base.Dispose(disposing);
}
#endregion
//##############################################################################
//LOGIN
//Metodo per il login dell'utente
[WebMethod (EnableSession=true)]
public bool Login( string LoginInserita, string PasswordInserita)
{
//connessione odbc al database mysql
//su windows
//OdbcConnection conn = new OdbcConnection("DRIVER={MySQL ODBC 3.51 Driver};"+"SERVER=localhost;"+"DATABASE=Login;"+"UID=root;"+"PASSWORD=rootpwd;");
//su linux
OdbcConnection conn = new OdbcConnection("DRIVER=MySQL;SERVER=localhost;DATABASE=login;UID=root;PASSWORD=rootpwd;");
OdbcDataReader dbReader = null;
conn.Open();
OdbcCommand cmd = conn.CreateCommand();
//controllo se la login e la password inserite dall'utente corrispondono ai dati mantenuti nel database "login"
cmd.CommandText = "Select * from Login where Login='"+ LoginInserita+"' and Password='"+PasswordInserita+"'";
dbReader = cmd.ExecuteReader();
//se si mantengo la login dell'utente in una variabile di sessione ed il metodo torna "true"
if(dbReader.Read())
{
Session.Add("Login", LoginInserita);
dbReader.Close();
conn.Close();
return true;
}
//atrimenti il metodo ritorna "false" password e login non sono corrette.
else
{
dbReader.Close();
conn.Close();
return false;
}
}
//##############################################################################
//TEST LOGIN
//Metodo che verifica il contenuto della variabile di Sessione "Login"
[WebMethod (EnableSession=true)]
public string TestLogin ()
{
//se la variabile di sessione non � vuota, significa che l'utente si � logato, quindi recupero alcuni dati su di lui, ad esempio il "ruolo aziendale"
if ((string)Session["Login"]!= null)
{
//Connessione al database su windows
//OdbcConnection conn = new OdbcConnection("DRIVER={MySQL ODBC 3.51 Driver};"+"SERVER=localhost;"+"DATABASE=Login;"+"UID=root;"+"PASSWORD=rootpwd;");
//su linux
OdbcConnection conn = new OdbcConnection("DRIVER=MySQL;SERVER=localhost;DATABASE=login;UID=root;PASSWORD=rootpwd;");
OdbcDataReader dbReader = null;
conn.Open();
OdbcCommand cmd = conn.CreateCommand();
cmd.CommandText = "Select RuoloAziendale from Login where Login ='"+(string)Session["Login"]+"'";
dbReader = cmd.ExecuteReader();
if(dbReader.Read())
{
Session.Add("Ruolo",(string)dbReader["RuoloAziendale"] );
dbReader.Close();
conn.Close();
}
return (string)Session["Ruolo"];
}
//se la variabile di sessione � vuota, l'utente non si � logato e quindi comunico un messaggio di errore
else
{
return "need to login";
}
}
//##############################################################################
//LOGOUT
//Metodo per il logout
[WebMethod (EnableSession=true)]
public bool Logout()
{
//pulisco le variabili di sessione ed il metodo torna "false"
Session.RemoveAll();
return false;
}
}
}
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Net;
namespace LoginClient
{
/// <summary>
/// Summary description for WebForm1.
/// </summary>
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Label LabelRuolo;
protected System.Web.UI.WebControls.Label LabelTest;
protected System.Web.UI.WebControls.TextBox TextBoxLogin;
protected System.Web.UI.WebControls.TextBox TextBoxPwd;
protected System.Web.UI.WebControls.Label Label1;
protected System.Web.UI.WebControls.Label Label2;
protected System.Web.UI.WebControls.Button ButtonLogin;
protected System.Web.UI.WebControls.Label LabelNome;
protected System.Web.UI.WebControls.Label Label4;
private localhost.LoginService MioServizio = new localhost.LoginService();
private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
}
#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.ButtonLogin.Click += new System.EventHandler(this.ButtonLogin_Click);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
private void ButtonLogin_Click(object sender, System.EventArgs e)
{
LabelTest.Text="";
System.Net.CookieContainer cookieJar = new System.Net.CookieContainer();
MioServizio.CookieContainer = cookieJar;
//LabelTest.Text=MioServizio.Login(TextBoxLogin.Text, TextBoxPwd.Text).ToString();
MioServizio.Login(TextBoxLogin.Text, TextBoxPwd.Text).ToString();
Session.Add("Login", cookieJar);
//LabelNome.Text= TextBoxLogin.Text;
MioServizio.CookieContainer = (System.Net.CookieContainer)Session["Login"];
Session["LoginUtente"]=TextBoxLogin.Text;
Session["RuoloAziendale"] = MioServizio.TestLogin();
if ((string)Session["RuoloAziendale"]=="need to login")
{
Session.RemoveAll();
LabelNome.Text=MioServizio.TestLogin();
}
else
{
Response.Redirect("WebForm2LoginClient.aspx");
}
}
}
}
