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difference between internal and protected

Posted on 2008-09-29
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Last Modified: 2010-05-18
i need to understand that difference between the two, to me the definitions I read, make them sound the same...I need to understand this better...
I know there are other...private and stuff...but I dont quite understand the difference between protected and internal.....some non technial explanations please.
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Question by:solraccheffy
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Expert Comment

by:wwnosal
ID: 22600513
Hi internal is just visible in files in same assembly unit (usually same project/solution).
Protected is visible in all derived classes (so classes that inherit after the class where you have defined protected members. )

so if you build a library  a put class A there using internal members and then try to derive class A in different project it will not work, however if you use them as a protected ones they will be visible in class derived from A.

Hope this helps
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by:solraccheffy
ID: 22606573
when you say assembly you mean the same dll right? I want to make sure I dont confuse assembly with classes...because aren't there some that only are available in class...as opposed to the entire dll?
I get lost in terminology....just want to have it simplified...like...dervied?
could you clarify a bit more?
also...isnt there another one protectedinternal?
how does that differ?
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Accepted Solution

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wwnosal earned 100 total points
ID: 22606887
when I mean same assembly I mean all the files that are linked by the linker to produce your dll or exe  or lib.
internal is then only visible in scope of this built "part".


 If you use protected I mean the following:
lets assume class A that has a protected member m_x.  you have built your lib with class A.
now you are doing new project where you are including this lib with class A in it.
in new project you are declaring class B to be inherited from A like this:

public B : A
{
};

So your protected member (m_x) from base clase A is visible in derived class B..





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