Imports System.Collections.Generic



Public Class SeasonEpisodeComparer

    Implements IComparer(Of String)

    Private Shared Function ParseSeasonEpisode(ByVal item As String, ByVal type As Boolean) As Integer

        Dim hyphenIndex As Integer = item.IndexOf("-")

        ' Normally do some error checking in case hyphenIndex==-1

        Dim firstPart As String

        If type = True Then

            firstPart = item.Substring(0, hyphenIndex)

        Else

            firstPart = item.Substring(hyphenIndex + 1)

        End If

        Return Integer.Parse(firstPart)

    End Function



    Public Function Compare(ByVal first As String, ByVal second As String) _

                As Integer Implements IComparer(Of String).Compare

        ' In real code you would probably add nullity checks

        Dim firstSeason As Integer = ParseSeasonEpisode(first, True)

        Dim secondSeason As Integer = ParseSeasonEpisode(second, True)

        Dim sameSeason As Integer = firstSeason.CompareTo(secondSeason)

        If sameSeason = 0 Then

            Dim firstEpisode As Integer = ParseSeasonEpisode(first, False)

            Dim secondEpisode As Integer = ParseSeasonEpisode(second, False)

            sameSeason = firstEpisode.CompareTo(secondEpisode)

        End If

        Return sameSeason

    End Function

End Class