Activator.CreateInstance Method (AppDomain, String, String)

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

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

public static ObjectHandle CreateInstance (
	AppDomain domain,
	string assemblyName,
	string typeName
)
public static ObjectHandle CreateInstance (
	AppDomain domain, 
	String assemblyName, 
	String typeName
)
public static function CreateInstance (
	domain : AppDomain, 
	assemblyName : String, 
	typeName : String
) : ObjectHandle
Not applicable.

Parameters

domain

The remote domain where the type named typeName is created.

assemblyName

The name of the assembly where the type named typeName is sought. If assemblyName is a null reference (Nothing in Visual Basic), the executing assembly is searched.

typeName

The name of the preferred type.

Return Value

A handle that must be unwrapped to access the newly created instance.

Exception typeCondition

ArgumentNullException

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

MissingMethodException

No matching public constructor was found.

TypeLoadException

typename was not found in assemblyName.

FileNotFoundException

assemblyName was not found.

MethodAccessException

The caller does not have permission to call this constructor.

MemberAccessException

Cannot create an instance of an abstract type.

-or-

This member was invoked with a late-binding mechanism.

TargetInvocationException

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

InvalidComObjectException

The COM type was not obtained through GetTypeFromProgID or GetTypeFromCLSID.

NotSupportedException

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

BadImageFormatException

assemblyName is not a valid assembly.

-or-

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.

FileLoadException

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

Use CreateInstance when a host needs to execute code in an AppDomain with restricted security permissions.

Use ObjectHandle.Unwrap to unwrap the return value.

NoteNote:

This method uses SecurityAction.LinkDemand to require the immediate caller to have full trust. For important limitations on using the LinkDemand member, see [<topic://cpcondemandvslinkdemand>].

  • LinkDemand  for full trust for the immediate caller. This member cannot be used by partially trusted code.
  • SecurityPermission  for the ability to call unmanaged code when creating an instance of a delegate. Associated enumeration: SecurityPermissionFlag.UnmanagedCode
  • ReflectionPermission  for the ability to invoke operations on all type members. Associated enumeration: ReflectionPermissionFlag.MemberAccess

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

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