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Nullable.Value Property

Note: This property is new in the .NET Framework version 2.0.

Gets the value of the current Nullable value.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

'Declaration
Public ReadOnly Property Value As T
'Usage
Dim instance As Nullable(Of T)
Dim value As T

value = instance.Value

/** @property */
public T get_Value ()

public function get Value () : T

Property Value

The value of the current Nullable object if the HasValue property is true. An exception is thrown if the HasValue property is false.

Exception typeCondition

InvalidOperationException

The HasValue property is false.

The following code example returns the value of a Nullable object if that object has a defined value; otherwise, a default value is returned.

' This code example demonstrates the Nullable(Of T).HasValue 
' and Value properties.

Imports System

Class Sample
    Public Shared Sub Main() 
        Dim myNow As Nullable(Of DateTime)

    '  Assign the current date and time to myNow then display its value.
        myNow = DateTime.Now
        Display(myNow, "1) ")
        
    '  Assign null (Nothing in Visual Basic) to myNow then display its value.
        myNow = Nothing
        Display(myNow, "2) ")
    End Sub 'Main
    
    ' Display the date and time.
    Public Shared Sub Display(ByVal displayDateTime As Nullable(Of DateTime), _
                              ByVal title As String) 

    ' If the HasValue property for the nullable of DateTime input argument is true, 
    ' display the value of the input argument; otherwise, display that no value is
    ' defined for the input value.
        Console.Write(title)
        If displayDateTime.HasValue = True Then
            Console.WriteLine("The date and time is {0:F}.", displayDateTime.Value)
        Else
            Console.WriteLine("The date and time is not defined.")
        End If
    End Sub 'Display 

End Class 'Sample '

'This code example produces the following results:
'
'1) The date and time is Tuesday, April 19, 2005 4:16:06 PM.
'2) The date and time is not defined.
'

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

.NET Compact Framework

Supported in: 2.0
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