Attribute.IsDefined Method (Module, Type, Boolean)

[ 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 module. Parameters specify the module, the type of the custom attribute to search for, and an ignored search option.

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


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


  • attributeType
    Type: System..::.Type
    The type, or a base type, of the custom attribute to search for.
  • inherit
    Type: System..::.Boolean
    This parameter is ignored, and does not affect the operation of this method.

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.


This method ignores the inherit parameter and does not search the ancestors of element 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