?
Solved

VB.Net Inheritance requiring a reference

Posted on 2013-06-18
7
Medium Priority
?
297 Views
Last Modified: 2013-06-28
Class A,B and C are all in different projects. (N-tier topology for A and B) C is a class with common properties used across many solutions.

Class B inherits Class C
Class A cannot call a method from class C via class B without a reference to class C?

Am I doing this correctly? I wouldn't think everything A needs to know about C would be in B.
0
Comment
Question by:Ryan
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 3
7 Comments
 
LVL 42

Expert Comment

by:sedgwick
ID: 39258511
>>Class A cannot call a method from class C via class B
what do u mean by that?
is it override function in B?
can u give concrete example?
0
 
LVL 13

Author Comment

by:Ryan
ID: 39268880
Class C
  public function DoThis() as string
end class C

Class B
  inherits C
  public function AlsoThis() as string
end class B

Class A
  dim test as Class B
  ?test.DoThis
end class A

This will work, but only if I reference both B and C with the project containing A. I was hoping to only reference B.
0
 
LVL 83

Expert Comment

by:CodeCruiser
ID: 39271570
When you add a reference to B, you also need to add reference to C because it is used by B.
0
Major Serverless Shift

Comparison of major players like AWS, Microsoft Azure, IBM Bluemix, and Google Cloud Platform

 
LVL 13

Author Comment

by:Ryan
ID: 39272414
CodeCruiser, thats what I'm seeing. I was hoping there was another way.

I did find another way, which doesn't require the 2nd reference, but requires rewriting the function signatures.  I'm seeing pros and cons to this.

Class C
  public shared function DoThis() as string
  public shared function DoThat() as integer
end class C

Class B
  public shared function DoThis as string
    return C.DoThis
  end function
  public shared function DoThis as integer
    return C.DoThat
  end function
  public shared function AlsoThis() as string
end class B

Class A
  ?B.DoThis
end class A
0
 
LVL 83

Accepted Solution

by:
CodeCruiser earned 2000 total points
ID: 39272543
You would still need access to the DLL containing Class C so you might as well add a reference to it.
0
 
LVL 13

Author Comment

by:Ryan
ID: 39272596
With the 2nd way, A doesn't need a reference to C.
0
 
LVL 83

Expert Comment

by:CodeCruiser
ID: 39272612
It does not need a reference correct but at runtime, A would need access to DLL file containing definition of C or you will get error.
0

Featured Post

Enroll in August's Course of the Month

August's CompTIA IT Fundamentals course includes 19 hours of basic computer principle modules and prepares you for the certification exam. It's free for Premium Members, Team Accounts, and Qualified Experts!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Many of us here at EE write code. Many of us write exceptional code; just as many of us write exception-prone code. As we all should know, exceptions are a mechanism for handling errors which are typically out of our control. From database errors, t…
It was really hard time for me to get the understanding of Delegates in C#. I went through many websites and articles but I found them very clumsy. After going through those sites, I noted down the points in a easy way so here I am sharing that unde…
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…
Suggested Courses

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question