直接进入回复窗口，所以几乎可以肯定有一个或三个错误:

Entered directly into the reply window, so there's almost certainly a bug or three:

Public Class Range

    Public Shared Function PrintRanges(ByVal numbers() As Integer) As String
        Dim buffer As New List(Of Range)()
        Dim CurrentRange As Range = Nothing

        For Each i As Integer in numbers ' you may want to add a .OrderBy() here
            If CurrentRange IsNot Nothing AndAlso i - 1 = CurrentRange.EndValue Then
                 CurrentRange.Increase()
            Else
                CurrentRange = New Range(i)
                buffer.Add(CurrentRange)
            End If
        Next i

        'Got a little lazy for this line - it still does a ", " rather than " and " for the final delimiter. Simple code to fix it, just tedious.
        Return String.Join(", ", buffer.Select(Function(r) r.ToString()).ToArray())
    End Function

    Private Sub New(ByVal InitialValue As Integer)
        EndValue = IntialValue
        Length = 1
    End Sub

    'For completeness, these two properties should be made read only outside the class, but the private constructor makes that largely moot
    Public Property EndValue As Integer
    Public Property Length As Integer

    Public Sub Increase()
         Length += 1
         EndValue += 1
    End Sub

    Public Overrides Function ToString() As String
        If Length == 1 Then Return EndValue.ToString()
        If Length == 2 Then Return (EndValue -1).ToString() & "," & LastValue.ToString()
        Return (EndValue - Length).ToString() & " through " & EndValue.ToString()
    End Function

End Class