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

 
System_CAPS_noteNote

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

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

public static ObjectHandle CreateInstance(
	string assemblyName,
	string typeName,
	object[] activationAttributes
)

Parameters

assemblyName
Type: System.String

The name of the assembly where the type named typeName is sought. If assemblyName is null, the executing assembly is searched.

typeName
Type: System.String

The fully qualified 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 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 class, or this member was invoked with a late-binding mechanism.

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.

-or-

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

-or-

activationAttributes is not a UrlAttribute

array.

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.

-or-

The assembly name or code base is invalid.

TargetInvocationException

An error occurred when attempting remote activation in a target specified in activationAttributes.

Use ObjectHandle.Unwrap to unwrap the return value.

System_CAPS_noteNote

Starting with the .NET Framework 2.0 Service Pack 1, this method can be used to create nonpublic types if the caller has been granted ReflectionPermission with the ReflectionPermissionFlag.RestrictedMemberAccess flag and if the grant set of the nonpublic types is restricted to the caller’s grant set or to a subset thereof. (See Security Considerations for Reflection.)

To use this functionality, your application should target the .NET Framework 3.5 or later.

SecurityPermission

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

ReflectionPermission

for accessing a nonpublic type when the grant set of the nonpublic type 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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