Export (0) Print
Expand All

Assembly.IsDefined Method

Indicates whether or not a specified attribute has been applied to the assembly.

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

public virtual bool IsDefined (
	Type attributeType,
	bool inherit
public boolean IsDefined (
	Type attributeType, 
	boolean inherit
public function IsDefined (
	attributeType : Type, 
	inherit : boolean
) : boolean



The Type of the attribute to be checked for this assembly.


This argument is ignored for objects of this type.

Return Value

true if the attribute has been applied to the assembly; otherwise, false.

Exception typeCondition


attributeType is a null reference (Nothing in Visual Basic).

The following code example defines an attribute and then uses IsDefined to indicate whether it was defined. It also tests an attribute that was not defined.

using System;
using System.Reflection;

// Set an assembly attribute.
[assembly:AssemblyTitleAttribute("A title example")]

// Note that the suffix "Attribute" can be omitted:
// [assembly:AssemblyTitle("A title example")]

public class Test {

    public static void Main() {

        // Get the assembly that is executing this method.
        Assembly asm = Assembly.GetCallingAssembly();

        // Get the attribute type just defined.
        Type aType = typeof(AssemblyTitleAttribute);
        Console.WriteLine(asm.IsDefined(aType, false));

        // Try an attribute not defined.
        aType = typeof(AssemblyVersionAttribute);
        Console.WriteLine(asm.IsDefined(aType, false));
//  The output is:
//  True
//  False

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, 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

.NET Compact Framework

Supported in: 2.0

Community Additions

© 2014 Microsoft