CreateInstanceFrom Method (String, String, Object[])

Activator.CreateInstanceFrom Method (String, String, Object[])

 

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

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

public static ObjectHandle CreateInstanceFrom(
	string assemblyFile,
	string typeName,
	object[] activationAttributes
)

Parameters

assemblyFile
Type: System.String

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

typeName
Type: System.String

The name of the preferred type.

activationAttributes
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
ArgumentNullException

typeName is null.

MissingMethodException

No matching public constructor was found.

TypeLoadException

typename was not found in assemblyFile.

FileNotFoundException

assemblyFile was not found.

MethodAccessException

The caller does not have permission to call this constructor.

MemberAccessException

Cannot create an instance of an abstract class, or this member was invoked with a late-binding mechanism.

TargetInvocationException

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

NotSupportedException

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

SecurityException

The caller does have the required FileIOPermission.

BadImageFormatException

assemblyFile 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.

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 section of the Assembly.LoadFrom and CreateInstance methods.

SecurityPermission

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

FileIOPermission

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

ReflectionPermission

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

ReflectionPermission

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

.NET Framework
Available since 1.1
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