Call IsDefined with invalid underlying integral value.

 

<Flags> Public Enum PetType As Integer
   None = 0
   Dog = 1
   Cat = 2
   Rodent = 4
   Bird = 8
   Reptile = 16
   Other = 32
End Enum

Module Example
   Public Sub Main()
      Dim value As Object
      value = 64
      Console.WriteLine("{0}: {1}", value, [Enum].IsDefined(GetType(PetType), value))
   End Sub
End Module

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Call IsDefined with invalid underlying integral value. : Enum « Data Types « VB.Net

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