Question

Hy Guys!

I have a list of “ObjDay” which could have replicated items. How can I select them?

ObjDay is:

    Public class ObjDay
        _date
        ...
    End Class

I tried to do:

replicatedItems = From d In ObjDaysList _
               Order By d._date _
               Group d By d._date Into newGroupOfObjDays = Group _
               Where newGroupOfObjDays.Count > 1 _
               Select newGroupOfObjDays

But I’m getting this error:

Can’t convert object of type ‘WhereSelectEnumerableIterator2[VB$AnonymousType_02[System.DateTime,System.Collections.Generic.IEnumerable1[ObjDay]], System.Collections.Generic.IEnumerable1[ObjDay]]’
in type ‘System.Collections.Generic.List`1[ObjDay]’.

---

Tks for help!

Answer 1

You’re selecting groups, and trying to assign it to a List(Of ObjDay). That won’t work. You could do:

'Get groups of duplicate items
Dim groups = From d In ObjDaysList _
             Order By d._date _
             Group d By d._date Into newGroupOfObjDays = Group _
             Where newGroupOfObjDays.Count > 1 _
             Select newGroupOfObjDays

'Get all items from these groups with SelectMany
replicatedItems = groups.SelectMany(Function(item) item).ToList