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This article mainly explains "how to upgrade the VB6.0 project". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to upgrade the VB6.0 project".

VB6.0 project upgrade

If you upgrade your VB6.0 project to Visual Basic .NET using the upgrade Wizard (Upgrade Wizard), it automatically adds a special piece of code to each form to simulate the default instantiation mechanism in previous Visual Basic versions by explicitly creating an instance of the form. This code is wrapped in a code block labeled "Upgrade Support" to generate an instance of the current form with the help of a new Shared attribute:

Private Shared m_vb6FormDefInstance As Form1 Private Shared m_InitializingDefInstance As Boolean Public Shared Property DefInstance () As Form1 Get If m_vb6FormDefInstance Is Nothing _ OrElse m_vb6FormDefInstance.IsDisposed Then m_InitializingDefInstance = True m_vb6FormDefInstance = New Form1 () m_InitializingDefInstance = False End If DefInstance = m_vb6FormDefInstance End Get Set (ByVal Value As Form1) m_vb6FormDefInstance = Value End Set End Property

The DefInstance in the code is a Shared property that can be accessed directly as "form name. DefInstance". Any code in its project that accesses it will get the same form instance. In this way, you can simulate the direct reference of the VB6.0 project to the form, but replace "Form2" with "Form2.DefInstance" in the code.

At this point, you just need to replace the corresponding direct reference to Form2 with Form2.DefInstance.Show () and Form2.DefInstance.TextBox1.Text = "Fred", respectively, and you are done. If you do not use the upgrade wizard, but manually insert the above code into the Visual Basic .NET form (and the code that the upgrade wizard automatically adds during the New process of the form), that's fine. Of course, you don't have to modify the form code, because there is a programming mode that simulates the creation of default form instances in .NET projects.

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