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LINQ Order By Fun

I came across something at work the other day that I found interesting, and since I am never afraid to admit that I don’t know something, I thought I would post it.  Other than the fact that I used anonymous types to create the sample objects as opposed to writing classes, the code explains itself:

Public Sub TestLinqOrderBy()
        Dim f1 = New With {Key .Commodity = "Commod1", .Qty = 1000}
        Dim f2 = New With {Key .Commodity = "Commod2", .Qty = 2000}
        Dim f3 = New With {Key .Commodity = "Commod3", .Qty = 3000}

        Dim list1 = GetAnonymousList(f1)

        'functionally these 2 calls are identical, since they are the same the rest of the example will use var
        Dim var = list1.OrderByDescending(Function(p) p.Qty) ' sort the list descending by quantity
        Dim var2 = From p In list1 Order By p.Qty Descending

        ' the list var now looks like this:
        'Commodity = "Commod3", Qty = 3000}
        'Commodity = "Commod2", Qty = 2000}
        'Commodity = "Commod1", Qty = 1000}

        'however, these will return you an IOrderedEnumerable (not an IEnumerable like most other simple linq queries), essentially a sorted list that will keep it sorted on the key
        'therefore, as statement like this may give you a list back you didnt expect because after the set has occurred, the IOrderedEnumerable will resort and keep itself sorted
        For i As Integer = 0 To 2
            var(i).Qty = New Random(i).Next(3000)

        ' since the above code changes the key of the list (Qty), it will set and reorder
        ' since you are looping through the list by index, you may not be changing the value in the list you thought you were when the loop began, 
        ' and the runtime will not tell you that you have modified the collection while looping

        ' the thing to note here is that if you specifiy an order by in your linq statement, that you are getting back a list that will always be sorted by the key, unless…
        ' if you want to sort a list with linq and then get it back without the live sorting, you can ToList your IOrderedEnumerable to return an IEnumerable
        Dim var3 = (list1.OrderByDescending(Function(p) p.Qty)).ToList  ' sort the list descending by quantity without live sorting
        Dim var4 = (From p In list1 Order By p.Qty Descending).ToList

    End Sub

    Private Function GetAnonymousList(Of T)(ByVal itemOfType As T) As List(Of T)
        Return New List(Of T)
    End Function
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