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OptionalAttribute Class

Indicates that a parameter is optional.

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

[AttributeUsageAttribute(AttributeTargets.Parameter, Inherited=false)] 
[ComVisibleAttribute(true)] 
public sealed class OptionalAttribute : Attribute
/** @attribute AttributeUsageAttribute(AttributeTargets.Parameter, Inherited=false) */ 
/** @attribute ComVisibleAttribute(true) */ 
public final class OptionalAttribute extends Attribute
AttributeUsageAttribute(AttributeTargets.Parameter, Inherited=false) 
ComVisibleAttribute(true) 
public final class OptionalAttribute extends Attribute

You can apply this attribute to parameters.

Optional parameters are not supported by all languages.

System.Object
   System.Attribute
    System.Runtime.InteropServices.OptionalAttribute
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 Millennium Edition, 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
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