Imports System.Numerics
Imports System
Imports System.Globalization
Module Example
Public Sub Main()
Dim numericString As String
Dim number As BigInteger = BigInteger.Zero
numericString = " -300 "
If BigInteger.TryParse(numericString, NumberStyles.None,
New BigIntegerFormatProvider(), number) Then
Console.WriteLine("'{0}' was converted to {1}.",
numericString, number)
Else
Console.WriteLine("Conversion of '{0}' to a BigInteger failed.",
numericString)
End If
End Sub
End Module
Public Class BigIntegerFormatProvider : Implements IFormatProvider
Public Function GetFormat(ByVal formatType As Type) As Object Implements IFormatProvider.GetFormat
If formatType Is GetType(NumberFormatInfo) Then
Dim numberFormat As New NumberFormatInfo
numberFormat.NegativeSign = "~"
Return numberFormat
Else
Return Nothing
End If
End Function
End Class