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Convert classes CType

Posted on 2008-10-29
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Last Modified: 2013-11-07
Hi!

I wonder If I can convert a class from one type to another

If I have
Public Class Test1
End Class

Public Class Test2
  Inherits Test1
End Class

Dim myTest1 as New Test1
Dim myTest2 = Ctype(mytest1, Test2)
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Question by:AWestEng
2 Comments
 
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Accepted Solution

by:
TechTiger007 earned 500 total points
ID: 22829732

You can convert an object of type Test2 into Test1 but you cannot convert Test1 into Test2, because a class reference can always point to an object of that particular type or of any derived type but not any other type.

In this case Test2 is derived from Test1 so

Dim myTest2 as New Test2
Dim myTest1 as Test1 = Ctype(mytest2, Test1)

would be valid not the other way around
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LVL 1

Author Comment

by:AWestEng
ID: 22829821
My design is then faulty.
I will make a new question for a redesign
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