AppDomain.CreateInstanceFromAndUnwrap Method (String, String, Object[])

Creates a new instance of the specified type defined in the specified assembly file.

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

public Object CreateInstanceFromAndUnwrap (
	string assemblyName,
	string typeName,
	Object[] activationAttributes
public Object CreateInstanceFromAndUnwrap (
	String assemblyName, 
	String typeName, 
	Object[] activationAttributes
public function CreateInstanceFromAndUnwrap (
	assemblyName : String, 
	typeName : String, 
	activationAttributes : Object[]
) : Object
Not applicable.



The file name and path of the assembly that defines the requested type.


The fully qualified name of the requested type, including the namespace but not the assembly (see the Type.FullName property).


An array of one or more attributes that can participate in activation. Typically, an array that contains a single UrlAttribute object. The UrlAttribute specifies the URL that is required to activate a remote object. For a detailed description of client-activated objects, see Client Activation.

Return Value

The requested object, or a null reference (Nothing in Visual Basic) if typeName is not found.

Exception typeCondition


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


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


The caller cannot provide activation attributes for an object that does not inherit from MarshalByRefObject.


The operation is attempted on an unloaded application domain.


assemblyName was not found.


typeName was not found in assemblyName.


No parameterless public constructor was found.


The caller does not have sufficient permission to call this constructor.


assemblyName is not a valid assembly.


Version 2.0 or later of the common language runtime is currently loaded and assemblyName was compiled with a later version.


An assembly or module was loaded twice with two different evidences.

This is a convenience method that combines CreateInstanceFrom and ObjectHandle.Unwrap. This method calls the default constructor for typeName.

For more information, see the Activator.CreateInstanceFrom method.

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

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

Community Additions