is object part of CollectionBase

Hanzaplast

hi guys can i get Collection from object if it is part of it? code should look something like this

public class SomeCollection : CollectionBase
{
public void Add(SomeClass sc)
{
this.List.Add(sc);
}
}

class SomeClass
{
public bool AmIPartOfCollection
{
get
{
//return false or true
}
}

public SomeCollection MyCollection
{
get
{
//if this object is part of SomeCollection return his SomeCollection
}
}
}

void Main()
{
SomeClass temp = new SomeClass();
//temp.AmIPartOfCollection - want to get false
//temp.MyCollection - want to get null

SomeCollection sc = new SomeCollection();
sc.Add(temp);

//temp.AmIPartOfCollection - want to get true
//temp.MyCollection - want to get reference to "sc" object

}

BobJanova

Not with a standard collection, no. It's pretty straightforward to write a specialised collection and interface for member objects to do this. However, in most situations you know roughly where the object must be, so you can use targetCollection.Contains.

Luc Pattyn

Hanzaplast wrote:

public SomeCollection MyCollection

Hanzaplast wrote:

//if this object is part of SomeCollection return his SomeCollection

you can't do that in general as an object may be part of more than one collection. :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Dave Kreskowiak

Damn! Beat me to it... My 5.

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Dave Kreskowiak

Luc Pattyn

you could have suggested a

public List MyCollections {get;}

:-D

Luc Pattyn [My Articles] Nil Volentibus Arduum

BillWoodruff

The inference I take from your answer, Luc (the answer seems "intuitively" correct to me), is that you could then iterate MyCollections, and, for each Collection in MyCollection, test for the presence of a specifc object using 'Contains. This solution also seeming to allow for the idea that you could also, then ... in the case of an object being a member of more than one Collection ... return a List of all Collections it was a member in, as well. However, I do think the OP's code is pretty weird. If you are going to add any type of object to a collection: that would seem to indicate a need to me for a generic (even "dynamic," late-bound ?) solution. thanks, Bill

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