KeyNotFoundException in byte arrary dictionary

[alanwo]

Hi Experts,

Interesting finding, when comparing two dictionary of byte(),
KeyNotFoundException throwed but, that byte() key is present in another
dictionary. Is that the limitation of comparison of dictionary having
byte() as key? I just think that dictionary will compare byte arrary
internally.
Microsoft, what is the workaround?
Thanks.

Alan

Public Class nByteBigram
Private mnBytegramCount As New Dictionary(Of Byte(), Integer)
.....

Public Function GetSimilarity(ByVal b As nByteBigram) As Double
Dim sim As Long
For Each k As Byte() In b.mnBytegramCount.Keys
Try
Dim a(k.Length - 1) As Byte
k.CopyTo(a, 0)
sim += Math.Min(Me.mnBytegramCount(k),
b.mnBytegramCount(a)) * 2
Catch ex As KeyNotFoundException
' exception from Me.mnBytegramCount(k)
End Try
Next
Return sim / (Me.mContentLength + b.mContentLength - 2)
End Function
....
End Class