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)

public virtual bool IsDefined(
	Type attributeType,
	bool inherit
)

Parameters

attributeType
Type: System.Type

The type of custom attribute to test for.

inherit
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.

Implements

ICustomAttributeProvider.IsDefined(Type, Boolean)

ExceptionCondition
ArgumentNullException

attributeType is null.

ArgumentException

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 System;
using System.Reflection;

//Define a module-level attribute.
[module: ReflectionModule_Examples.MySimpleAttribute("module-level")]

namespace ReflectionModule_Examples
{
    class MyMainClass
    {
        static void Main()
        {
            Module[] moduleArray;

            moduleArray = typeof(MyMainClass).Assembly.GetModules(false);

            //In a simple project with only one module, the module at index 
            // 0 will be the module containing these classes.
            Module myModule = moduleArray[0];

            Type myType;
            myType = myModule.GetType("ReflectionModule_Examples.MySimpleAttribute");
            Console.WriteLine("IsDefined(MySimpleAttribute) = {0}", myModule.IsDefined(myType, false));
        }
    }

    //A very simple custom attribute.
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Module)]
    public class MySimpleAttribute : Attribute
    {
        private string name;

        public MySimpleAttribute(string newName)
        {
            name = newName;
        }
    }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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