• Article

Attribute.IsDefined Method (MemberInfo, Type)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

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

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

Syntax

'Declaration
Public Shared Function IsDefined ( _
    element As MemberInfo, _
    attributeType As Type _
) As Boolean

public static bool IsDefined(
    MemberInfo element,
    Type attributeType
)

Parameters

  • 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.

Exceptions

Exception Condition
ArgumentNullException

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

attributeType is not derived from Attribute.
NotSupportedException

element is not a constructor, method, property, event, type, or field.

Remarks

The ancestors of element are searched for custom attributes.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.