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Module::IsDefined Method

Returns a value that indicates whether the specified attribute type has been applied to this module.

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

virtual bool IsDefined(
	Type^ attributeType, 
	bool inherit


Type: System::Type

The type of custom attribute to test for.

Type: System::Boolean

This argument is ignored for objects of this type.

Return Value

Type: System::Boolean
true if one or more instances of attributeType have been applied to this module; otherwise, false.


ICustomAttributeProvider::IsDefined(Type, Boolean)


attributeType is nullptr.


attributeType is not a Type object supplied by the runtime. For example, attributeType is a TypeBuilder object.

The following example demonstrates a use of the IsDefined method.

using namespace System;
using namespace System::Reflection;

namespace ReflectionModule_Examples

   //A very simple custom attribute.

   public ref class MySimpleAttribute: public Attribute
      String^ name;

      MySimpleAttribute( String^ newName )
         name = newName;



//Define a module-level attribute.

int main()
   moduleArray = ReflectionModule_Examples::MySimpleAttribute::typeid->Assembly->GetModules( false );

   //In a simple project with only one module, the module at index 
   // 0 will be the module containing these classes.
   System::Reflection::Module^ myModule = moduleArray[ 0 ];
   Type^ myType;
   myType = myModule->GetType( "ReflectionModule_Examples.MySimpleAttribute" );
   Console::WriteLine( "IsDefined(MySimpleAttribute) = {0}", myModule->IsDefined( myType, false ) );

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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