Question

I have custom type name Netsgroup which is a collection of Net class.

Net class , contsains: Netname and list of string Parts.

class Netsgroup:  CollectionBase
{
 // a collection of nets
    public Net[] nets
    {
        get { return (Net[]) this.InnerList.ToArray(typeof(Net)); }
    }
}

public class Net
{

    string netname;
    public string Netname
    {
        get { return netname; }
        set { netname = value; }
    }


   List<string> parts= new List<string>();
    public  List<string> Parts
    {
        get { return parts; } 
    }
}

An example of Netsgroup is:

Net1 u1, u2, u3

Net2 u4,u5,u3

Net3 u4,u6, u7

Each line is with Netname and Parts.

I want to find the duplicates in the Netsgroup collection.

Like:

net1, net2 has u3

net2, net3 has u4

How can I intersect the Parts from all Nets to find duplicates?

Thanks, Avi.

Answer 1

I think doing this would be easiest using LINQ:

var duplicates =
    from net in netsgroup.nets
    from part in net.Parts
    group net by part into g
    where g.Count() >= 2
    select g;

If you want to write the results in the format you specified into console, you can use something like:

foreach (var dup in duplicates)
    Console.WriteLine(
        "{0} has {1}", string.Join(", ", dup.Select(n => n.Netname)), dup.Key);