aggregation

[sridharvenkataramanan]

i have a class where i am storing the error header information and another class to store the details about the errors like the following
header
---------
id, name

details
---------
field id
changed value
original value

now i want to create an instance to header class through which i need to input values to details and well the single header class can have multiple details

say
1,"x","101","ab ","mm"
1,"x","102","mx ","zz"

something like the above.

i have seen couple of examples like aggregation of header with details
but they requires two instances.

Could you please guide me to proceed in oops way....

[Christian Binder]

I hope, I've understood your problem correctly:

If you get
1,"x","101","ab ","mm"
1,"x","102","mx ","zz"
, you want to create one instance of Header-class (1, "x") and two instances of Details ("101","ab","mm " and "102","mx","zz" )

Is that right?

You could use a management-class, which holds all Headers and provides a method e.g. GetHeaderInstan ce(id, name).
This method checks, if a instance of Header exists with given id and name (therefore it has a List with all instances of Header). If not, it creates one and stores it in the Header-List.

[sridharvenkataramanan]

Thanks for the immediate response.

If you could throw some more lights or a simple example for the same would be very much helpful,.

:) thanks

[sridharvenkataramanan]

I hope i have solved this in the following way. is it right?

i have used class details as aggregation with class header and added multiple values to the dictionary object pointing to the details
like the followings.
Dictionary<stri ng, Details> objDetails

[Christian Binder]

Yes, this should be okay. So you can add multiple Details to a Header.