Activator.CreateInstanceFrom Method (AppDomain, String, String, Boolean, BindingFlags, Binder, Object[], CultureInfo, Object[])

.NET Framework (current version)

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

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

public static ObjectHandle CreateInstanceFrom(
	AppDomain domain,
	string assemblyFile,
	string typeName,
	bool ignoreCase,
	BindingFlags bindingAttr,
	Binder binder,
	object[] args,
	CultureInfo culture,
	object[] activationAttributes


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.

Type: System.Boolean

true to specify that the search for typeName is not case-sensitive; false to specify that the search is case-sensitive.

Type: System.Reflection.BindingFlags

A combination of zero or more bit flags that affect the search for the typeName constructor. If bindingAttr is zero, a case-sensitive search for public constructors is conducted.

Type: System.Reflection.Binder

An object that uses bindingAttr and args to seek and identify the typeName constructor. If binder is null, the default binder is used.

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.Globalization.CultureInfo

Culture-specific information that governs the coercion of args to the formal types declared for the typeName constructor. If culture is null, the CultureInfo for the current thread is used.

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 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.Runtime.Remoting.ObjectHandle

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

Exception Condition

domain or typeName is null.


No matching 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.


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


assemblyFile is not a valid assembly.


assemblyName was compiled for a version of the common language runtime that is later than the version that is currently loaded.

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.

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


for the ability to call unmanaged code when creating an instance of a delegate. Associated enumeration: SecurityPermissionFlag.UnmanagedCode


for supplying evidence. Associated enumeration: SecurityPermissionFlag.ControlEvidence


for the ability to search directory paths and read their contents. Associated enumerations: FileIOPermissionAccess.PathDiscovery and FileIOPermissionAccess.Read


for accessing nonpublic types and members when the grant set of the nonpublic types and members is restricted to the caller's grant set or to a subset thereof. Associated enumeration: ReflectionPermissionFlag.RestrictedMemberAccess


for accessing nonpublic types and members regardless of their grant set. Associated enumeration: ReflectionPermissionFlag.MemberAccess


requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

.NET Framework
Available since 4.0
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