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Missing Class

Represents a missing Object. This class cannot be inherited.

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

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public sealed class Missing : ISerializable
/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
public final class Missing implements ISerializable
SerializableAttribute 
ComVisibleAttribute(true) 
public final class Missing implements ISerializable

Missing is used to invoke a method with a default argument.

Only one instance of Missing ever exists.

The following example shows a use of Missing to invoke a method with a default argument.

Imports System
Imports System.Reflection
Imports Microsoft.VisualBasic

Public Class MissingSample
    
    Shared Sub Main()
        'To invoke MyMethod with a default argument, use the following syntax:
        GetType(MissingSample).GetMethod("MyMethod").Invoke(Nothing, New Object() {Missing.Value})
    End Sub     
    
    Shared Function MyMethod(Optional k As Integer = 33) As Integer
        Console.WriteLine("k = " & k.ToString())
        Return 0
    End Function
End Class

System.Object
  System.Reflection.Missing

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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