Chapter2: IENTBaseEntity Implementation

Haegendoorn · July 12th, 2009, 09:41 AM

I am currently reading this book and am trying to write it in VB.NET and I have a question about the IENTBaseEntity Implementation on page 43.

The main idea (what i understand of it) is that the auto generated code from the HRPaidTimeOff.dbml should ideally not be modified by the user, but we want the ENTUserAccount to implement the IENTBaseEntity interface.

The C# code:

Code:

public partial class ENTUserAccount : IENTBaseEntity { }

The VB code (i think this is correct):

Code:

 
Partial Public Class ENTUserAccount
    Implements IENTBaseEntity
End Class

When i have this code (the vb version) in the CustomizedEntities.vb
I get the error of IntelliSense that this class does not implement the interface properties, because the concerning properties do not append the

Code:

 Implements Framework.IENTBaseEntity.InsertDate

I dont know if this is a requirement in C# (to append the above code) but how can i fix this error without modifying the HRPaidTimeOff.dbml code?

If I let IntelliSense implement this Interface, it renames the concerning properties to InsertDate1, InsertENTUserAccountID1 and so on, or is this the purpose of the partial class?

Thanks in advance
Haegendoorn

Docter · July 21st, 2009, 03:35 AM

Did you fix your issue ? I have the same problem.

Haegendoorn · July 21st, 2009, 04:59 AM

Quote:

Originally Posted by Docter

Did you fix your issue ? I have the same problem.

Someone (i cant find his post in the thread

) gave me the advice to set the auto-generated code in a separate C# project.

This is because C# allows implicit interface implementation and VB doesn't (only explicit implementation). What I did was copy the auto-generated code (still in VB) to a separate .vb file and change it there. But i am not sure if that is a proper solution in the long term.

Try out both solutions and see what works best for you, and let me know!

Haegendoorn

Wousch · September 24th, 2009, 04:17 AM

All,

Haegendoorn do you still have the issue you describe?

I had the same issue. The problem is that you need to use "Overloads" in the interface "IENTBaseEntity".

Code:

Imports System.Data.Linq

Namespace Framework

    Public Interface IENTBaseEntity

        Overloads Property InsertDate() As Date

        Overloads Property InsertENTUserAccountId() As Integer

        Overloads Property UpdateDate() As Date

        Overloads Property UpdateENTUserAccountId() As Integer

        Overloads Property Version() As Binary

    End Interface
End Namespace

This sorts out the issue you describe.
------------------------------------------

Unfortunate, I got an other issue also related to page 43 at the bottom...
...Now create a data class that handles the ENTUserAccount entity object. Create a class to the framework folder called ENTUserAccountData. The class should be made public and should inherit from ENTBaseData.

Code:

' Class ENTUserAccountData
Imports System.Data.Linq

Public Class ENTUserAccountData
    Inherits ENTBaseData(Of ENTUserAccount)

' Class ENTBaseData 

Imports V2.PaidTimeOffDAL.Framework

Public MustInherit Class ENTBaseData(Of T As IENTBaseEntity)
   
' Customized Entities which contains the partial class ENTUserAccount

Imports V2.PaidTimeOffDAL.Framework

Namespace V2.PaidTimeOffDAL

    Partial Public Class ENTUserAccount
        Implements IENTBaseEntity

No the problem I have is blue line under ENTUserAccount in the class ENTUserAccountData. It states: "Type argument 'V2.PaidTimeOffDAL.ENTUserAccount' does not inherit from or implement from the contraint type 'V2.PaidTimeOffDAL.Framework.IENTBaseEntity' "'

It looks somehow that it doesn't see my partial class ENTUserAccount which implements IENTBaseEntity?

I'm stuck on this quite a while so help would be much appreciated!

Cheers!
Wouter

Haegendoorn · September 24th, 2009, 04:44 AM

Quote:

No the problem I have is blue line under ENTUserAccount in the class ENTUserAccountData. It states: "Type argument 'V2.PaidTimeOffDAL.ENTUserAccount' does not inherit from or implement from the contraint type 'V2.PaidTimeOffDAL.Framework.IENTBaseEntity' "'

It looks somehow that it doesn't see my partial class ENTUserAccount which implements IENTBaseEntity?

I'm stuck on this quite a while so help would be much appreciated!

Cheers!
Wouter

I dont know a specific answer to your problem, but what I did was the following: Delete the interface related properties in the auto-generated file, and rewrite them in the partial class and append the Implements Interface...

Hopes this helps,

Haegendoorn · September 24th, 2009, 04:50 AM

If you want I can email you the files I got (until Chapter 6 or so)
mail me at haegendoorn (email AT char) base (dot) be

With kind regards,