VB Migration Partner

KNOWLEDGE BASE - Classes and COM objects


Previous | Index | Next 

[INFO] Properties may be migrated without any warning related to VB6’s ByRef parameters being converted to VB.NET’s ByVal parameters

VB.NET doesn’t support ByRef parameters in Property blocks, thus parameters that were passed using ByRef have to be converted to ByVal parameters. Instead of issuing a warning any time such a conversion is applied, VB Migration Partner does emit a warning only if the parameter is assigned inside the Property. This strategy reduces the number of unnecessary warnings that the developer must scrutinize after the migration. For example, consider the following VB6 code:
    Property Get TestProperty(index As Integer) As String
        index = index + 1
        TestProperty = CStr(index)
    End Property

    Property Let TestProperty(index As Integer, value As String)
        value = value & "*"
        m_TestProperty = value
    End Property
This is the result of the migration:
    Public Property TestProperty(ByVal index As Short) As String
        Get
            ' UPGRADE_WARNING (#0104): Argument 'index' was 
            ' passed by reference in Property Get
            index = index + 1
            Return CStr(index)
        End Get
        Set(ByVal value As String)
            ' UPGRADE_WARNING (#0114): Argument 'value' was 
            ' passed by reference in Property Let
            value = value & "*"
            m_TestProperty = value
        End Set
    End Property
As you see, no warning is issued for the Index parameter in the Set block, because that parameter isn’t assigned in the original Property Set procedure.
Previous | Index | Next 




Follow Francesco Balena on VB6 migration’s group on

LinkedIn





Read Microsoft Corp’s official case study of a VB6 conversion using VB Migration Partner.




Code Architects and its partners offers remote and onsite migration services.

More details




Subscribe to our free newsletter for useful VB6 migration tips and techniques.

newsletter



To learn more about your VB6 applications, run VB6 Analyzer on your source code and send us the generated text file. You will receive a detailed report about your VB6 applications and how VB Migration Partner can help you to quickly and effectively migrate it to .NET.

Get free advice



A fully-working, time-limited Trial Edition of VB Migration Partner allows you to test it against your actual code

Get the Trial




The price of VB Migration Partner depends on the size of the VB6 application, the type of license, and other factors

Request a quote




Migrating a VB6 application in 10 easy steps

Comparing VB Migration Partner with Upgrade Wizard

Migration tools: Feature Comparison Table

All whitepapers