CreateInstanceFromAndUnwrap Method (String, String, Object[])

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


Type: System.String

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

Type: System.String

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

Type: System.Object[]

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

This parameter is related to client-activated objects.Client activation is a legacy technology that is retained for backward compatibility but is not recommended for new development. Distributed applications should instead use Windows Communication Foundation.

Return Value

Type: System.Object

The requested object, or null if typeName is not found.

Exception Condition

assemblyName is null.


typeName is null.


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 about this method, see the Activator.CreateInstanceFrom method.


for the ability to access the location of the assembly. Associated enumeration: FileIOPermissionAccess.PathDiscovery


for the ability to read the file containing the assembly manifest. Associated enumeration: FileIOPermissionAccess.Read


for the ability to access the location of the assembly if the assembly is not local.

.NET Framework
Available since 1.1
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