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VB.NET Language in a Nutshell, Second Edition by Steven Roman PhD, Paul Lomax, Ron Petrusha

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Name

MyBase Keyword

Syntax

MyBase

Description

Provides a reference to the base class from within a derived class. If you want to call a member of the base class from within a derived class, you can use the syntax:

MyBase.MemberName

where MemberName is the name of the member. This will resolve any ambiguity if the derived class also has a member of the same name.

Rules at a Glance

  • MyBase will call through the chain of inherited classes until it finds a callable implementation. For example, in the code:

    Public Class CTestClass
    ...
    End Class
    
    Public Class CTestClass2
       Inherits CTestClass
    
       Public Function ShowType(  ) As Type
          Return Mybase.GetType
       End Function
    End Class

    the call to ShowType is eventually resolved as a call to Object.GetType, since all classes are ultimately derived from the Object class.

  • MyBase cannot be used to call Private class members.

  • MyBase cannot be used to call base class members marked as MustOverride.

Programming Tips and Gotchas

  • MyBase is commonly used to call back into the overridden member from the member that overrides it in the derived class.

  • The MyBase keyword can be used to call the constructor of the base class to instantiate a member of that class, as in:

    MyBase.New(...)

VB.NET/VB 6 Differences

The MyBase keyword is new to VB.NET.

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