Hello,
please see if you can help with the problem below. I'm attempting to create an EntityPropertyDescriptor and getting a null reference exception. Help will be much appreciated.
Fred
LLBLGen Pro version/buildnumber: 1.0.2004.1 Final
Runtime library version: v1.1.4322 (updated... sorry about previous error here)
Template group: self-servicing
.Net version: 1.1
Database type: Sql Server 2000
The PageTypeEnum parameter is defined like so:
public enum PageTypeEnum : int
{
Home = 62
, About = 63
// etc
}
The constant ITEM_NOT_IN_COLLECTION is -1.
The "Page" table of the database is scripted as follows:
CREATE TABLE [dbo].[Page] (
[PageID] [int] IDENTITY (1, 1) NOT NULL ,
[PageTypeLID] [int] NOT NULL ,
[SiteID] [int] NOT NULL ,
[IsDisplayed] [bit] NOT NULL ,
[IsComplete] [bit] NOT NULL
) ON [PRIMARY]
GO
Hierarchy:
A PracticeEntity has a SiteCollection.
A SiteEntity has a PageCollection.
A PageEntity has a ContentCollection.
The routine throwing the error is attempting to return the requested pageEntity based on its PageTypeLID, which corresponds to the PageTypeEnum. Here is the code for that routine.
public PageEntity GetPageEntity(PageTypeEnum pt)
{
EntityPropertyDescriptor ptLID = new
EntityPropertyDescriptor(EntityFieldFactory.Create(PageFieldIndex.PageTypeLID), typeof(PageEntity));
int idx = ActiveSite.PageCollection.Find(ptLID, (int)pt);
if (idx != BHCS.HTPN.API.Constants.ITEM_NOT_IN_COLLECTION)
{
return ActiveSite.PageCollection[idx];
}
return null;
}
The problem occurrs in the first line, creating the property descriptor. Below is the exception data from that. At the end of DataAccess.Create(PageFieldIndex fieldIndex) it knows that fieldToReturn is PageTypeLID, but something apparently goes wrong inside ORMSupportClasses, which I can cannot single-step into.
1) Exception Information
Exception Type: System.NullReferenceException
Message: Object reference not set to an instance of an object.
TargetSite: System.Object InternalGetValue()
HelpLink: NULL
Source: mscorlib
StackTrace Information
at System.Enum.InternalGetValue()
at System.Enum.System.IConvertible.ToUInt16(IFormatProvider provider)
at SD.LLBLGen.Pro.ORMSupportClasses.EntityPropertyDescriptor..ctor(IEntityField field, Type typeOfBindedObject)
at BHCS.HTPN.Practices.BasePage.GetPageEntity(PageTypeEnum pt) in c:\htpn\practices\basepage.cs:line 221
at BHCS.HTPN.Practices.BasePage.GetPageEntity() in c:\htpn\practices\basepage.cs:line 234
at BHCS.HTPN.Practices.BasePage.GetContentEntity(ContentTypeEnum ct) in c:\htpn\practices\basepage.cs:line 144
at BHCS.HTPN.Practices.Home.GetIntroImage() in C:\HTPN\Practices\Home.aspx.cs:line 82
at BHCS.HTPN.Practices.Home.Page_Load(Object sender, EventArgs e) in C:\HTPN\Practices\Home.aspx.cs:line 97
at System.Web.UI.Control.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain()
