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AppDomain.CreateInstanceFromAndUnwrap Method (String, String, Boolean, BindingFlags, Binder, Object[], CultureInfo, Object[], Evidence)

Creates a new instance of the specified type defined in the specified assembly file.

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

public Object CreateInstanceFromAndUnwrap(
	string assemblyName,
	string typeName,
	bool ignoreCase,
	BindingFlags bindingAttr,
	Binder binder,
	Object[] args,
	CultureInfo culture,
	Object[] activationAttributes,
	Evidence securityAttributes


Type: System.String

The file name and path of the assembly that defines the requested type.

Type: System.String

The fully qualified name of the requested type, including the namespace but not the assembly, as returned by the Type.FullName property.

Type: System.Boolean

A Boolean value specifying whether to perform a case-sensitive search or not.

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 enables the binding, coercion of argument types, invocation of members, and retrieval of MemberInfo objects through reflection. If binder is null, the default binder is used.

Type: System.Object[]

The arguments to pass to the constructor. This array of arguments must match in number, order, and type the parameters of the constructor to invoke. If the default constructor is preferred, args must be an empty array or null.

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. Typically, an array that contains a single UrlAttribute object. The UrlAttribute specifies the URL that is required to activate a remote object.

Type: System.Security.Policy.Evidence

Information used to authorize creation of typeName.

Return Value

Type: System.Object
The requested object, or null if typeName is not found.


assemblyName is null.


typeName is null.


The caller cannot provide activation attributes for an object that does not inherit from MarshalByRefObject.


The operation is attempted on an unloaded application domain.


assemblyName was not found.


typeName was not found in assemblyName.


No parameterless public constructor was found.


The caller does not have sufficient permission to call this constructor.


assemblyName is not a valid assembly.


Version 2.0 or later of the common language runtime is currently loaded and assemblyName was compiled with a later version.


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

This is a convenience method that combines CreateInstanceFrom and ObjectHandle.Unwrap.

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

For more information, see the Activator.CreateInstanceFrom method.

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