Main with Nullable (Of T) : nullable « Language Basics « VB.Net

1. VB.Net
2. Language Basics
3. nullable

Main with Nullable (Of T)

   

Class MyClass1
    Public numericValue As Nullable(Of Integer)
    Public boolValue As Nullable(Of Boolean) = True

    Public Function GetIntFromDatabase() As Nullable(Of Integer)
        Return numericValue
    End Function

    Public Function GetBoolFromDatabase() As Nullable(Of Boolean)
        Return boolValue
    End Function

    Public Shared Sub Main()
        Dim dr As New MyClass1()
        Dim i As Nullable(Of Integer) = dr.GetIntFromDatabase()
        If (i.HasValue) Then
            Console.WriteLine("Value of 'i' is: {0}", i.Value)
        Else
            Console.WriteLine("Value of 'i' is undefined.")
        End If
        Dim b As Nullable(Of Boolean) = dr.GetBoolFromDatabase()
        If (b.HasValue) Then
            Console.WriteLine("Value of 'b' is: {0}", b.Value)
        Else
            Console.WriteLine("Value of 'b' is undefined.")
        End If
    End Sub
End Class

   
    
    
  

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