DataPortal.Fetch failed (Object reference not set to an instance of an object.)

Lyndon posted on Tuesday, December 23, 2008

Hi Everyone,

Im awaiting shipment of Rocky's latest book- so this might be documented in there. But ahead of it, I have the following question.

I am in the process of converting an application that i have running successfully under CSLA 2.1 to 3.6.

I have created my business objects in two different ways- one along the model that Rocky provides in his Project Tracker application sample for 3.6, and the other way using the latest codesmith templates on codeplex.

In both cases the business objects compile successfully, but when they are run they result in the above error message when i attempt to call the object.

Here is the code for from the codesmith templates I generated:

//------------------------------------------------------------------------------

// <autogenerated>

// This code was generated using CSLA 2.x CodeSmith Template Collection.

// Changes to this file may be lost if the code is regenerated.

// Modify user class PriorityList.cs to extend this generated code.

// Code was generated at 12/20/2008 7:49:41 PM by Lyndon

// Template path: C:\Users\Lyndon\Downloads\CSLAcontrib-44818\CodeGenTemplates\CodeSmith\CSLA35\CSharp\EditableRootList.cst

// Template website: http://www.codeplex.com/Wiki/View.aspx?ProjectName=CSLAcontrib

// </autogenerated>

//------------------------------------------------------------------------------

using System;

using System.Linq;

using Csla;

using Csla.Data;

using HRSM2010.DAL;

namespace HRSM2010.Library

{

[Serializable()]

public partial class PriorityList : BusinessListBase<PriorityList, Priority>

{

#region BindingList Overrides

protected override object AddNewCore()

{

Priority item = Priority.NewPriority();

this.Add(item);

return item;

}

#endregion //BindingList Overrides

#region Factory Methods

private PriorityList()

{ /* require use of factory method */ }

public static PriorityList NewPriorityList()

{

return DataPortal.Create<PriorityList>();

}

public static PriorityList GetPriorityList()

{

return DataPortal.Fetch<PriorityList>();

}

#endregion //Factory Methods

#region Data Access

#region Data Access - Create

[RunLocal]

protected override void DataPortal_Create()

{

bool cancel = false;

OnCreating(ref cancel);

if (cancel) return;

OnCreated();

}

partial void OnCreating(ref bool cancel);

partial void OnCreated();

#endregion //Data Access - Create

#region Data Access - Fetch

private void DataPortal_Fetch()

{

bool cancel = false;

OnFetching(ref cancel);

if (cancel) return;

using (var mgr = ContextManager<HRSM2010.DAL.HRSMDynDataContext>

.GetManager(Database.HRSMDyn))

{

RaiseListChangedEvents = false;

this.AddRange(

from row in mgr.DataContext.PriorityTables

select Priority.GetPriority(row.PriorityCode)

);

RaiseListChangedEvents = true;

}//using

OnFetched();

}

partial void OnFetching(ref bool cancel);

partial void OnFetched();

#endregion //Data Access - Fetch

#region Data Access - Update

protected override void DataPortal_Update()

{

bool cancel = false;

OnUpdating(ref cancel);

if (cancel) return;

using (var mgr = ContextManager<HRSM2010.DAL.HRSMDynDataContext>

.GetManager(Database.HRSMDyn))

{

DataPortal.UpdateChild(this);

mgr.DataContext.SubmitChanges();

}//using

OnUpdated();

}

partial void OnUpdating(ref bool cancel);

partial void OnUpdated();

#endregion //Data Access - Update

#endregion //Data Access

}

I am intending to use Windows Authentication purely. In CSLA 2.1 , I dont think I had to use the Security folder and objects to get this working. ie I wasnt using form login. However, in 3.6 when I set up Authentication Mode="Windows" in the web.config file, I am getting error in the above subject line.

Am I missing something here? ie is the equivalent of security folder in the PTtracker example required in my application even if I am using Windows integrated security? Am I correct in assuming the fetch isnt successful because of authenication?

Thanks in advance for any help.

Lyndon replied on Tuesday, December 23, 2008

yes I did. It comes up with a data portal exception aboce in subject line

Here is web.config below ( error occurs when allow users="*" is set- when deny users="?" is set I simply get an 'Access is denied' from IIS)

<?xml version="1.0"?>

</sectionGroup>

</configSections>

<!--<add key="CslaDataPortalProxy" value="Csla.DataPortalClient.RemotingProxy, Csla"/>

<!--<add key="CslaDataPortalProxy" value="Csla.DataPortalClient.WebServicesProxy, Csla"/>

</appSettings>

<add name="HRSM2010.DAL.Properties.Settings.HRSMDynConnectionString1"

connectionString="Data Source=LYNDON-MAIN\VS2008;Initial Catalog=HRSMDyn;Integrated Security=True;"

providerName="System.Data.SqlClient" />

</connectionStrings>

<system.web>

<!--

Set compilation debug="true" to insert debugging

symbols into the compiled page. Because this

affects performance, set this value to true only

during development.

Visual Basic options:

Set strict="true" to disallow all data type conversions

where data loss can occur.

Set explicit="true" to force declaration of all variables.

-->

<!--<roleManager enabled="true" defaultProvider="SqlRoleManager">

</providers>

</roleManager>-->

</assemblies>

</compilation>

<pages>

</namespaces>

</controls>

</pages>

<!--

The <authentication> section enables configuration

of the security authentication mode used by

ASP.NET to identify an incoming user.

-->

<!--<forms loginUrl="Login.aspx" name="ptracker"/>

</authentication>-->

</authorization>

<!--

The <customErrors> section enables configuration

of what to do if/when an unhandled error occurs

during the execution of a request. Specifically,

it enables developers to configure html error pages

to be displayed in place of a error stack trace.

</customErrors>

-->

</httpHandlers>

</providers>

</roleManager>

</httpModules>

</system.web>

<system.codedom>

</compiler>

</compilers>

</system.codedom>

<!--

The system.webServer section is required for running ASP.NET AJAX under Internet

Information Services 7.0. It is not necessary for previous version of IIS.

-->

<system.webServer>

</modules>

</handlers>

</system.webServer>

</dependentAssembly>

</dependentAssembly>

</assemblyBinding>

</runtime>

</configuration>

DataPortal.Fetch failed (Object reference not set to an instance of an object.)

Lyndon posted on Tuesday, December 23, 2008

ajj3085 replied on Tuesday, December 23, 2008

Lyndon replied on Tuesday, December 23, 2008

ajj3085 replied on Tuesday, December 23, 2008

Lyndon replied on Friday, December 26, 2008