Compare items in list<dbcollection> if the same?

[BIM_VIET]

I have a ListA - List<Dbcollection> with each item is a group of polylines (polyline have some property: Length, Xdata…):

List<Dbcollection> :

(0 - {poly1,  poly2, poly3…}, 

1 - {poly1,  poly2, poly3, poly4…},

2 - {poly1,  poly2, poly3…} …)

I would like to compare whether each item in ListA is the same together or not? Please help me how to do that.

Thanks in advance!

[BIM_VIET]

Any help?

[_gile]

Hi,

Your question is not clear.

You should clarify what you want to achieve.

The type "Dbcollection" does not exist in the API.

What is the type of an item in ListA? a polyline? a list of polylines?

[BIM_VIET]

@_gile ,

The type of ListA is List<DBObjectCollection>, DBObjectCollection is List of Polylines.

[_gile]

OK, now you have to clarify what do you mean with: "I would like to compare whether each item in ListA is the same together or not?"

Do you want to evaluate if two DBObjectCollection contains the same DBObjects (Polylines)? in the same order?

[BIM_VIET]

@_gile , 

Yes, that's what I want

[_gile]

Does the order of polyline in the collection matters?

[_gile · Accepted solution]

If the order of polylines in the collections does not matter, this shoul do the trick.

private static bool ContentsEqual(DBObjectCollection collection1, DBObjectCollection collection2) => 
        collection1.Count != collection2.Count &&
        !collection1.Cast<DBObject>().Except(collection2.Cast<DBObject>()).Any();

If the order matters use this instaed.

private static bool OrderedContentsEqual(DBObjectCollection collection1, DBObjectCollection collection2)
{
    if (collection1.Count != collection2.Count)
        return false;
    for (int i = 0; i < collection1.Count; i++)
    {
        if (collection1[i] != collection2[i])
            return false;
    }
    return true;
}