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Activator::CreateInstanceFrom Method (AppDomain, String, String)

Creates an instance of the type whose name is specified in the specified remote domain, using the named assembly file and default constructor.

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

static ObjectHandle^ CreateInstanceFrom(
	AppDomain^ domain, 
	String^ assemblyFile, 
	String^ typeName


Type: System::AppDomain

The remote domain where the type named typeName is created.

Type: System::String

The name of a file that contains an assembly where the type named typeName is sought.

Type: System::String

The name of the preferred type.

Return Value

Type: System.Runtime.Remoting::ObjectHandle
A handle that must be unwrapped to access the newly created instance.


domain or typeName is nullptr.


No matching public constructor was found.


typename was not found in assemblyFile.


assemblyFile was not found.


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 constructor, which was invoked through reflection, threw an exception.


The caller does have the required FileIOPermission.


assemblyFile is not a valid assembly.


The common language runtime (CLR) version 2.0 or later is currently loaded, and assemblyName was compiled for a version of the CLR that is later than the currently loaded version. Note that the .NET Framework versions 2.0, 3.0, and 3.5 all use CLR version 2.0.

Use CreateInstanceFrom when a host needs to execute code in an application domain that has restricted security permissions.

Use the ObjectHandle::Unwrap method to unwrap the return value.


This method uses SecurityAction::LinkDemand to require the immediate caller to have full trust. For important limitations on using the LinkDemand member, see Demand vs. LinkDemand.

For information about other exceptions that can be thrown by invoked methods, see the Exceptions section of the Assembly::LoadFrom and CreateInstance methods.

.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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