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Interfaces

Posted on 2016-08-23
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Last Modified: 2016-08-23
I'm new to using Interfaces.  I using  library that has an object defined as an interface.  How do I create/new an object of this type?
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Question by:HLRosenberger
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Expert Comment

by:AndyAinscow
ID: 41766931
something like
dim obj as InterfaceX = new InterfaceX
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Author Comment

by:HLRosenberger
ID: 41766956
if I do that, I get "'New' cannot be used on an interface".
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Accepted Solution

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AndyAinscow earned 250 total points
ID: 41766987
oops, sorry.  The new should be used on a class that is based on the interface

dim obj as InterfaceX = new classX

with the following:
Public Interface InterfaceX
    Sub IFoo()
End Interface

Public Class classX
    Implements InterfaceX

    Public Sub IFoo() Implements InterfaceX.IFoo
        MessageBox.Show("Foo")
    End Sub
End Class
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Assisted Solution

by:Fernando Soto
Fernando Soto earned 250 total points
ID: 41767016
Hi HLRosenberger;

An interface is a definition of what needs to be implemented in your code to fulfill the contract of that interface. Please see this Microsoft Documentation on Interfaces (Visual Basic) for more details.
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Author Closing Comment

by:HLRosenberger
ID: 41767438
thanks.
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Expert Comment

by:Fernando Soto
ID: 41767447
Not a problem, glad to help.
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