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RSH 06-11-2007 08:39 PM

Use of user created classes across pages
 
I am struggling with a concept I'm not really finding a lot of in depth
articles on but Im sure others have had similar issues.

What is the best practice when it comes to persisting custom created objects
during a user's session?

I have created several objects that when run with an Out of Process session
state they cause the dreaded "Unable to serialize the session state. Please
note that non-serializable objects or MarshalByRef objects are not permitted
when session state mode is 'StateServer' or 'SQLServer'. " exception.

In the past I have created a base object that contained all of the
serializable properties, then create a concrete class underneath and
basically stripped the base class off and saved it in a session variable and
then "bolted" it back up when needed on other pages (.net 1.1). But now
that I am at the point where I need to develop an application I am wondering
how to deal with custom objects and persisting them properly.

Im struggling using OOP techniques for the web. How are other people
handling these techniques?

This is an example of the class that wont serialize, but I need to reference
it throughout the user's session:

Thanks,
Ron


<Serializable()> Public Class CompanyBase

#Region "Member Variables"

Private m_ID As System.Int32

Private m_OfficeID As System.String

Private m_CompanyID As System.String

Private m_AliasID As System.String

Private m_CompanyName As System.String



Private m_DataSource As DataSourceType

Private m_oData As BaseDataClass

#End Region

#Region "Member Properties"

Public Property ID() As System.Int32

Get

Return m_ID

End Get

Set(ByVal Value As System.Int32)

m_ID = Value

End Set

End Property

Public Property OfficeID() As System.String

Get

Return m_OfficeID

End Get

Set(ByVal Value As System.String)

m_OfficeID = Value

m_CompanyDataset.Tables(0).Rows(0).Item("OfficeID" ) = Value

End Set

End Property

Public Property CompanyID() As System.String

Get

Return m_CompanyID

End Get

Set(ByVal Value As System.String)

m_CompanyID = Value

End Set

End Property

Public Property AliasID() As System.String

Get

Return m_AliasID

End Get

Set(ByVal Value As System.String)

m_AliasID = Value

End Set

End Property

Public Property CompanyName() As System.String

Get

Return m_CompanyName

End Get

Set(ByVal Value As System.String)

m_CompanyName = Value

End Set

End Property



#End Region

#Region "Constructor"

Public Sub New()

End Sub

Public Sub New(ByVal companyID As String)

m_CompanyID = companyID

m_DataSource = DataSourceType.SQLServer

DataSourceBuilder()

End Sub

#End Region

#Region "Member Methods"

Private Sub DataSourceBuilder()

If m_DataSource = DataSourceType.XML Then

m_File = HttpContext.Current.Request.PhysicalApplicationPat h & Me.CompanyID
& "_Company.xml"

m_oData = DataFactory.GetDataClass(m_File, DataSourceType.XML)

m_oData.ConnectionString = m_File

m_oData.PrimaryKey = "ID"

ElseIf m_DataSource = DataSourceType.Access Then

m_File = HttpContext.Current.Request.PhysicalApplicationPat h & "Global.mdb"

m_oData = DataFactory.GetDataClass(m_File, DataSourceType.Access)

m_oData.ConnectionString = m_File

m_oData.PrimaryKey = "ID"

m_oData.SQLString = "select * from companies WHERE CompanyID = '" &
m_CompanyID & "'"

ElseIf m_DataSource = DataSourceType.SQLServer Then

m_oData = DataFactory.GetDataClass("Global", DataSourceType.SQLServer)

m_oData.SQLString = "select * from Global.dbo.companies WITH(NOLOCK) WHERE
CompanyID = '" & m_CompanyID & "'"

m_oData.PrimaryKey = "ID"

End If

m_CompanyDataset = m_oData.GetDataSet()

BindProperties()

End Sub

Private Sub BindProperties()

Dim oDr As DataRow

If Not CompanyID Is Nothing Then

If m_CompanyDataset.Tables(0).Rows.Count > 0 Then

oDr = m_CompanyDataset.Tables(0).Rows(0)

ID = IIf(Not IsDBNull(oDr("ID")), oDr("ID"), Nothing)

OfficeID = IIf(Not IsDBNull(oDr("OfficeID")), oDr("OfficeID"), Nothing)

CompanyID = IIf(Not IsDBNull(oDr("CompanyID")), oDr("CompanyID"), Nothing)

AliasID = IIf(Not IsDBNull(oDr("AliasID")), oDr("AliasID"), Nothing)

CompanyName = IIf(Not IsDBNull(oDr("CompanyName")), oDr("CompanyName"),
Nothing)



End If

End If

End Sub

Public Sub UpdateDataSet()

Dim oDr As DataRow

If m_CompanyDataset.Tables(0).Rows.Count > 0 Then

oDr = m_CompanyDataset.Tables(0).Rows.Find(ID)

oDr("OfficeID") = IIf(OfficeID <> Nothing, OfficeID, DBNull.Value)

oDr("CompanyID") = IIf(CompanyID <> Nothing, CompanyID, DBNull.Value)

oDr("AliasID") = IIf(AliasID <> Nothing, AliasID, DBNull.Value)

oDr("CompanyName") = IIf(CompanyName <> Nothing, CompanyName, DBNull.Value)



End If

End Sub

Public Function GetOutput() As String

Dim sb As New StringBuilder

For Each prop As PropertyInfo In Me.GetType.GetProperties

sb.Append(prop.Name & " - " & prop.GetValue(Me, Nothing) & "<br>")

Next

Return sb.ToString

End Function

Public Sub SaveChanges()

UpdateDataSet()

m_oData.SaveDataSet(m_CompanyDataset)

End Sub

#End Region

End Class




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