Attribute.IsDefined Method (ParameterInfo, Type)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Determines whether any custom attributes are applied to a method parameter. Parameters specify the method parameter, and the type of the custom attribute to search for.

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


Public Shared Function IsDefined ( _
    element As ParameterInfo, _
    attributeType As Type _
) As Boolean
public static bool IsDefined(
    ParameterInfo element,
    Type attributeType


  • attributeType
    Type: System..::.Type
    The type, or a base type, of the custom attribute to search for.

Return Value

Type: System..::.Boolean
true if a custom attribute of type attributeType is applied to element; otherwise, false.


Exception Condition

element or attributeType is nullNothingnullptra null reference (Nothing in Visual Basic).


attributeType is not derived from Attribute.


The ancestors of element are searched for custom attributes.

Version Information

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0


Windows Phone

See Also


Attribute Class

IsDefined Overload

System Namespace