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Zone: > NEWSGROUP > Asp.Net Forum > starter_kits_and_source_projects.dotnetnuke.custom_modules Tags:
Item Type: NewsGroup Date Entered: 11/8/2005 10:15:58 PM Date Modified: Subscribers: 0 Subscribe Alert
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[email protected]
Asp.Net User
Problem with - dynamically create provider11/8/2005 10:15:58 PM

0/0

Could any one please explain how the "dynamic create provider" works in the DataProvider class?  what is the proper "name space" and "assembly name" that I should use to make this work. 

Any suggestion is greatly appreciated or please gear me in the right direction.  I have been stucked at this for a while now. 

this is my code

Private Shared Sub CreateProvider()

objProvider = CType(Framework.Reflection.CreateObject("data", "PAS.DNN.Modules.pasStateVB.Data", "PAS.DNN.Modules.pasStateVB"), DataProvider)

End Sub

this is the error I get
DotNetNuke.Services.Exceptions.ModuleLoadException: The type initializer for "PAS.DNN.Modules.pasStateVB.Data.DataProvider" threw an exception. ---> System.TypeInitializationException: The type initializer for "PAS.DNN.Modules.pasStateVB.Data.DataProvider" threw an exception. ---> System.ArgumentNullException: Value cannot be null. Parameter name: type at System.Activator.CreateInstance(Type type, Boolean nonPublic) at System.Activator.CreateInstance(Type type) at DotNetNuke.Framework.Reflection.CreateObject(String TypeName, String CacheKey) in C:\DotNetNuke\components\Shared\Reflection.vb:line 102 at DotNetNuke.Framework.Reflection.CreateObject(String ObjectProviderType, String ObjectNamespace, String ObjectAssemblyName) in C:\DotNetNuke\components\Shared\Reflection.vb:line 67 at PAS.DNN.Modules.pasStateVB.Data.DataProvider.CreateProvider() in C:\dotnetnuke\DesktopModules\pasStateVB\Components\DataProvider.vb:line 20 at PAS.DNN.Modules.pasStateVB.Data.DataProvider..cctor() in C:\dotnetnuke\DesktopModules\pasStateVB\Components\DataProvider.vb:line 15 --- End of inner exception stack trace --- at PAS.DNN.Modules.pasStateVB.Data.DataProvider.Instance() at PAS.DNN.Modules.pasStateVB.Business.pasStateController.Add(pasStateInfo objpasState) in C:\dotnetnuke\DesktopModules\pasStateVB\Components\pasStateVBController.vb:line 26 at PAS.DNN.Modules.pasStateVB.pasStateVBEdit.cmdUpdate_Click(Object sender, EventArgs e) in C:\dotnetnuke\DesktopModules\pasStateVB\pasStateVBEdit.ascx.vb:line 76 --- End of inner exception stack trace ---
thecrispy1
Asp.Net User
Re: Problem with - dynamically create provider11/9/2005 1:46:28 PM

0/0

Private Const [NameSpace] As String = "DotNetNuke.Modules.Forum" ' project namespace

Private Const [AssemblyName] As String = "DotNetNuke.Modules.Forum" ' project assemblyname

I am not sure exactly what you are asking but I am guessing that you are not properly labeling this in your modules DataProvider file located in the module project. 

Chris Paterra
ikamiksok
Asp.Net User
Re: Problem with - dynamically create provider11/9/2005 9:14:08 PM

0/0

I don't have code in front of me but hopefully my memory serves me correctly....

Note that the names are also case sensitive. Miscapitalize a letter and it won't work. Note the DNN data provider makes assumptions for reflection on certain naming.

Your provider dll file name should be exactly as the assembly name I believe. So it should be PAS.DNN.Modules.pasStateVB.dll. Note that your data provider class should be of the namespace PAS.DNN.Modules.pasStateVB.Data also. And these should be written like thecrispy1 said.

So

Private Const [NameSpace] As String = "PAS.DNN.Modules.pasStateVB.Data "
Private Const [AssemblyName] As String = "PAS.DNN.Modules.pasStateVB"
Actual file name: PAS.DNN.Modules.pasStateVB.dll
Namespace for your dataprovider class: PAS.DNN.Modules.pasStateVB.Data

namespace used

Make sure your namespaces and dll file name all match correctly including case. This has been asked a lot so you can search the forums on data provider for more examples and advice.

jason
[email protected]
Asp.Net User
Re: Problem with - dynamically create provider12/5/2005 10:51:51 PM

0/0

Thank Jason

I was able to get it to work
[email protected]
Asp.Net User
Re: Problem with - dynamically create provider12/13/2005 11:46:13 PM

0/0

Jason,

I was able to over come this issue.  however I have another question.  Can we have two different DataProvider.cs in the same module and also have the two SqlDataProvider.cs.  Each access different tables in the database.

this is what I have

public class SqlDataProvider : DataProvider

{...}

public class SqlDataProviderTM : DataProviderTM

{...}

but have this error on the line below shown in red

public abstract class DataProviderTM

{

private static void CreateProvider()

{

objProvider = ((DataProviderTM)DotNetNuke.Framework.Reflection.CreateObject("data", "PAS.AgentAdmin", "PAS.AgentAdmin"));

}

....}

this is an error I get on this line

 System.InvalidCastException: Specified cast is not valid.

 

the question is does dotnetnuke allow to have more than one dataprovider or just one?  what if my module need to access more than one tables and I would like to break the sqldataprovider on muliple class.

 

 

 

 

 

 
RobProProgger
Asp.Net User
Re: Problem with - dynamically create provider1/8/2006 5:02:47 PM

0/0

Hello!

I have got the same problem as [email protected].
I have written the correct NameSpace and Assemblyname but I
just keep getting this error in Visual Studio.

Errormessage:
"An unhandled exception of type 'System.MemberAccessException' ocurred
in mscorib.dll
Additional information: Cannot Create an abstract class."

Exception:
System.TypeInitializationException
----Inner exception:     System.MemberAccessException
----Message:               "Cannot create an abstract class." 
----Source:                  mscorlib

Code:
Imports System
Imports System.Web.Caching
Imports System.Reflection

Namespace INVID.DNN.Modules.HelloWorld.Data

    Public MustInherit Class DataProvider

#Region "Shared/Static Methods"
        ' singleton reference to the instantiated object
      Private Shared objProvider As DataProvider = Nothing

        ' constructor
        Shared Sub New()
            CreateProvider()
        End Sub

        ' dynamically create provider
       '  This sub gets called, It is calling the methods that will raise the exception
      Private Shared Sub CreateProvider()
         objProvider = CType(Framework.Reflection.CreateObject( _
            "data", _
            "INVID.DNN.Modules.HelloWorld.Data", _
            "INVID.DNN.Modules.HelloWorld"), DataProvider)
      End Sub

      ' return the provider
      Public Shared Shadows Function Instance() As DataProvider
         Return objProvider
      End Function
#End Region
    End Class
End Namespace

Code that is called in (The Step were it goes wrong) Components\Shared\Reflection.vb:

   ' dynamically create an object from a TypeName using a CacheKey
        Public Shared Function CreateObject(ByVal TypeName As String,  _
            ByVal CacheKey As String) As Object

            If CacheKey = "" Then
                CacheKey = TypeName
            End If

            ' use the cache for performance
            Dim objType As Type = CType(DataCache.GetCache(CacheKey), Type)

            ' is the type in the cache?
            If objType Is Nothing Then
                Try
                    ' use reflection to get the type of the class
                    objType = Type.GetType(TypeName, True)
                    ' insert the type into the cache
                    DataCache.SetCache(CacheKey, objType)
                Catch exc As Exception
                    ' could not load the type
                    LogException(exc)
                End Try
            End If
            ' dynamically create the object
            Return Activator.CreateInstance(objType) ' This line raises the error mentioned before
        End Function


Any help on this error will be much appreciated!
Best regards [email protected]
6 Items, 1 Pages 1 |< << Go >> >|


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