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Activator.CreateInstance Method (String, String, Boolean, BindingFlags, Binder, Object[], CultureInfo, Object[], Evidence)

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

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

public static ObjectHandle CreateInstance(
	string assemblyName,
	string typeName,
	bool ignoreCase,
	BindingFlags bindingAttr,
	Binder binder,
	Object[] args,
	CultureInfo culture,
	Object[] activationAttributes,
	Evidence securityInfo
)

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 name of the preferred type.

ignoreCase
Type: System.Boolean

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

bindingAttr
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.

binder
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.

args
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.

culture
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.

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. The UrlAttribute specifies the URL that is required to activate a remote object.

securityInfo
Type: System.Security.Policy.Evidence

Information used to make security policy decisions and grant code permissions.

Return Value

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

ExceptionCondition
ArgumentNullException

typeName is null.

MissingMethodException

No matching 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.

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.

-or-

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

-or-

The constructor that best matches args has varargs arguments.

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 ObjectHandle.Unwrap to unwrap the return value.

The activationAttributes parameter is related to client-activated objects; see Client Activation.

NoteNote:

Starting with the .NET Framework version 2.0 Service Pack 1, this method can be used to create nonpublic types and members if the caller has been granted ReflectionPermission with the ReflectionPermissionFlag.RestrictedMemberAccess flag and if the grant set of the assembly that contains the nonpublic types and members 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 version 3.5. For more information, see .NET Framework 3.5 Architecture.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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