Hellow,

I'm reading asp.net 2.0 website programming Problem Design and Solution and I got a big problem in chapter 3

when I try to do this cast:

Public NotInheritable Class Globals

...

'pag 103
        Public Shared ReadOnly Settings As TheBeerHouseSection = _
                CType(WebConfigurationManager.GetSection("theBeerH ouse"), MB.TheBeerHouse.TheBeerHouseSection)

End Class

I got this error:


Server Error in '/MyTheBeerHouse' Application.
--------------------------------------------------------------------------------

Unable to cast object of type 'MB.TheBeerHouse.TheBeerHouseSection' to type 'MyTheBeerHouse.MB.TheBeerHouse.TheBeerHouseSectio n'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidCastException: Unable to cast object of type 'MB.TheBeerHouse.TheBeerHouseSection' to type 'MyTheBeerHouse.MB.TheBeerHouse.TheBeerHouseSectio n'.

Source Error:


Line 18: 'pag 103
Line 19: 'todo: estou tendo um erro aqui
Line 20: Public Shared ReadOnly Settings As TheBeerHouseSection = _
Line 21: CType(WebConfigurationManager.GetSection("theBee rHouse"), MB.TheBeerHouse.TheBeerHouseSection)
Line 22:


Source File: D:\Visual Studio 2005\LIVRO WebSite Programming\MyTheBeerHouse\MyTheBeerHouse\App_Code \Globals.vb Line: 20

Stack Trace:


[InvalidCastException: Unable to cast object of type 'MB.TheBeerHouse.TheBeerHouseSection' to type 'MyTheBeerHouse.MB.TheBeerHouse.TheBeerHouseSectio n'.]
MyTheBeerHouse.MB.TheBeerHouse.Globals..ccto r() in D:\Visual Studio 2005\LIVRO WebSite Programming\MyTheBeerHouse\MyTheBeerHouse\App_Code \Globals.vb:20

[TypeInitializationException: The type initializer for 'MyTheBeerHouse.MB.TheBeerHouse.Globals' threw an exception.]
MyTheBeerHouse.MB.TheBeerHouse.UI.BasePage.O nPreInit(EventArgs e) in D:\Visual Studio 2005\LIVRO WebSite Programming\MyTheBeerHouse\MyTheBeerHouse\App_Code \BasePage.vb:10
System.Web.UI.Page.ProcessRequestMain(Boolea n includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +663




--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433


Someone could help me?


and another question:

What is the difference between 'MB.TheBeerHouse.TheBeerHouseSection' and 'MyTheBeerHouse.MB.TheBeerHouse.TheBeerHouseSectio n'

Hi pedroabs,

If you have changed your the root namespace of your application you need to be aware of the impact in doing so. It looks to me like you have not updated all namespace declarations to "MyBeerHouse.MB...". Can I ask what your reason was changing it in the first place? If you wanted to create a more personal namespace heirarchy in your app, you should really use the general convention CompanyName.ApplicationName.ClassName/group (i.e. MB.TheBeerHouse.TheBeerHouseSection).

As for the above error, can you check the type you are declaring for "TheBeerHouseSection" in web.config. It's possible you have not updated this to your new namespace.

Hope that helps.

Retro

Hi Retro:

Well, I didn't update my namespace, but i realize that when I try to convert like this:

'pag 103
 Public Shared ReadOnly Settings As TheBeerHouseSection = _
                CType(WebConfigurationManager.GetSection("theBeerH ouse"), TheBeerHouseSection)

the first part of my expression
[Settings As TheBeerHouseSection] have the type of ['MB.TheBeerHouse.TheBeerHouseSection']
and the second part of my expression
[WebConfigurationManager.GetSection("theBeerHouse")] have the type of
['MyTheBeerHouse.MB.TheBeerHouse.TheBeerHouseSectio n']


What is the difference between ['MB.TheBeerHouse.TheBeerHouseSection'] and ['MyTheBeerHouse.MB.TheBeerHouse.TheBeerHouseSectio n'] ?

I have just one class [TheBeerHouseSection].... maybe I have to review my web.config...


I declared in my web.config the <section type="MB.TheBeerHouse.TheBeerHouseSection" ...

Hi pedroabs,

[InvalidCastException: Unable to cast object of type 'MB.TheBeerHouse.TheBeerHouseSection' to type 'MyTheBeerHouse.MB.TheBeerHouse.TheBeerHouseSectio n'.]
   MyTheBeerHouse.MB.TheBeerHouse.Globals..cctor() in D:\Visual Studio 2005\LIVRO WebSite Programming\MyTheBeerHouse\MyTheBeerHouse\App_Code \Globals.vb:20

This would suggest somewhere that you have used the namespace MyBeerHouse.MB....

You ask what the difference is between the two. A namespace is a hierarchical method of organizing your classes into logical groups. If you change the root namespace you are changing that grouping. This is not a problem as long as you update all your namespace declarations.

Problems can occur if not all references are updated. Imagine you have a class "Customers" in the namespace MyCompany.MyApp.DAL which inherits from MyCompany.MyApp.DAL.Provider and then you change your namespace on your Customers class to Fred.MyCompany.MyApp.DAL but don't update your provider. Your Customer class will no longer be able to reference the provider class (unless of course you import it).

Hope that helps explain.

Regards.

I have the same problem described at:

http://p2p.wrox.com/topic.asp?TOPIC_ID=69248

I can't solve it yet...

I never change my namespace, I just see that when I try this in [u]Watch Window</u>:

CType(WebConfigurationManager.GetSection("theBeerH ouse"), MB.TheBeerHouse.TheBeerHouseSection)

the value is

{MB.TheBeerHouse.TheBeerHouseSection}



When I try this:

CType(WebConfigurationManager.GetSection("theBeerH ouse"),MyTheBeerHouse.MB.TheBeerHouse.TheBeerHouseSection)

or that:

CType(WebConfigurationManager.GetSection("theBeerH ouse"), TheBeerHouseSection)

The value is:

Cannot convert to 'Class TheBeerHouseSection'

can you confirm in Globals.vb you have:

and in web.config:

Thanks

Hi Retroviz

I solve the problem changing the web.config:

The code below works well

<configSections>
    <section name="theBeerHouse" type="MyTheBeerHouse.MB.TheBeerHouse.TheBeerHouseSecti on"/>

</configSections>
<theBeerHouse defaultConnectionStringName="LocalSqlServer">
    <contactForm mailTo="[email protected]" />
</theBeerHouse>


The code below didn't work well:


<configSections>
    <section name="theBeerHouse" type="MB.TheBeerHouse.TheBeerHouseSection, __code"/>

</configSections>
<theBeerHouse defaultConnectionStringName="LocalSqlServer">
    <contactForm mailTo="[email protected]" />
</theBeerHouse>



I just put the entire namespace in the type of the Section tag

Thank you very very much !!!

I'm confirming:

my code:

Imports System.Web.Configuration

Namespace MB.TheBeerHouse
    ''' <summary>
    ''' Esta classe apresenta propriedades globais para todo o site
    ''' </summary>
    ''' <remarks>Pag 40</remarks>
    Public NotInheritable Class Globals

        'pag 40
        Public Shared ThemesSelectorID As String = ""

        'pag 103
        Public Shared ReadOnly Settings As TheBeerHouseSection = _
                CType(WebConfigurationManager.GetSection("theBeerH ouse"), TheBeerHouseSection)

    End Class


My web.config:





  <configSections>
    <section name="theBeerHouse" type="MyTheBeerHouse.MB.TheBeerHouse.TheBeerHouseSection"/>

  </configSections>
  <theBeerHouse defaultConnectionStringName="LocalSqlServer">
    <contactForm mailTo="[email protected]" />
  </theBeerHouse>

I hope to help someone else who have this problem !!!

Attention:

MyTheBeerHouse is the root namespace of my project !!!

great. Glad to see you got it working.