Aqalmal posted on Friday, August 31, 2007

Hello,

I am a beginer user of CSLA. I am reading

Expert C# Business Objects

Rockford Lhotka

Apress®

© 2004 Rockford Lhotka

I complete the CSLA frame work and Project Tracker from this book.

When I try to create a new instance of Project class I received the following Error.

I compare my code with one on the Web site its look like same.

Line 77:    return Activator.CreateInstance(businessType, true);

StackOverflowException: Exception of type System.StackOverflowException was thrown.]

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeType.CreateInstanceImpl(Boolean publicOnly) +0
   System.Activator.CreateInstance(Type type, Boolean nonPublic) +66
   CSLA.Server.DataPortal.CreateBusinessObject(Object criteria) in d:\myprojects\visual studio projects\csla\csla.server.dataportal\dataportal.cs:77
   CSLA.Server.DataPortal.Create(Object criteria, Object principal) in d:\myprojects\visual studio projects\csla\csla.server.dataportal\dataportal.cs:142
   CSLA.DataPortal.Create(Object criteria) in d:\myprojects\visual studio projects\csla\csla\dataportal.cs:137
   ProjectTracker.Library.Project.NewProject() in d:\myprojects\visual studio projects\projecttracker\projecttracker.library\project.cs:205
   PTWeb.Projects.btnNewProject_Click(Object sender, EventArgs e) in c:\inetpub\wwwroot\ptweb\projects.aspx.cs:81
   System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e) +108
   System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +138
   System.Web.UI.Page.ProcessRequestMain() +1244

If any one can shed some light on it.

 

Thanks,

Aqal

 

RockfordLhotka replied on Saturday, September 01, 2007

What code do you have in your object's constructor? To get a stack overflow, you almost certainly have a recursive call, and since this happens in the Activator.CreateInstance() call, the only thing .NET will be executing is your constructor.

Aqalmal replied on Sunday, September 02, 2007

According to book I don't have any thing in constructor  below is the code

#region Constructor
  private Project()
  {
   // To prevent direst instantiation
  }
  #endregion

and below is the static method...

#region Static Methods
  public static Project NewProject()
  {
   if(!Thread.CurrentPrincipal.IsInRole("ProjectManager"))
   {
    throw new System.Security.SecurityException("User not authorized to add project");
   }
   return (Project)DataPortal.Create(new Criteria(Guid.Empty));
  }

Best,

Aqal

 

 

RockfordLhotka replied on Monday, September 03, 2007