Activator.CreateInstance Method (Type, Object[], Object[])

Creates an instance of the specified type using the constructor that best matches the specified parameters.

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

public static Object CreateInstance(
	Type type,
	Object[] args,
	Object[] activationAttributes


Type: System.Type

The type of object to create.

Type: System.Object[]

An array of arguments that match in number, order, and type the parameters of the constructor to invoke. If args is an empty array or null, the constructor that takes no parameters (the default constructor) is invoked.

Type: System.Object[]

An array of one or more attributes that can participate in activation. This is typically an array that contains a single UrlAttribute object. The UrlAttribute specifies the URL that is required to activate a remote object.

Return Value

Type: System.Object
A reference to the newly created object.


type is null.


type is not a RuntimeType.


type is an open generic type (that is, the ContainsGenericParameters property returns true).


type cannot be a TypeBuilder.


Creation of TypedReference, ArgIterator, Void, and RuntimeArgumentHandle types, or arrays of those types, is not supported.


activationAttributes is not an empty array, and the type being created does not derive from MarshalByRefObject.


The constructor that best matches args has varargs arguments.


The constructor being called throws an exception.


The caller does not have permission to call this constructor.


Cannot create an instance of an abstract class, or this member was invoked with a late-binding mechanism.


The COM type was not obtained through GetTypeFromProgID or GetTypeFromCLSID.


No matching public constructor was found.


type is a COM object but the class identifier used to obtain the type is invalid, or the identified class is not registered.


type is not a valid type.

The constructor to be invoked must be accessible and must provide the most specific match with the specified argument list.

The activationAttributes parameter is related to client-activated objects; see Client Activation.


Starting with the .NET Framework version 2.0 Service Pack 1, this method can be used to access nonpublic types if the caller has been granted ReflectionPermission with the ReflectionPermissionFlag.RestrictedMemberAccess flag and if the grant set of the assembly that contains the nonpublic types is restricted to the caller’s grant set, or to a subset thereof. (See Security Considerations for Reflection.)

To use this functionality, your application should target the .NET Framework version 3.5. For more information, see .NET Framework 3.5 Architecture.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
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