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

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

.NET Framework 4.6 and 4.5

Creates a new instance of the specified type defined in the specified assembly file, specifying whether the case of the type name is ignored; the binding attributes and the binder that are used to select the type to be created; the arguments of the constructor; the culture; and the activation attributes.

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

member CreateInstanceFromAndUnwrap : 
        assemblyFile:string *
        typeName:string *
        ignoreCase:bool *
        bindingAttr:BindingFlags *
        binder:Binder *
        args:Object[] *
        culture:CultureInfo *
        activationAttributes:Object[] -> Object


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 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.Object

The requested object, or null if typeName is not found.

Exception Condition

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 matching public constructor was found.


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


assemblyName is not a valid assembly.


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


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

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

For more information about this method, see the Activator.CreateInstanceFrom method.


for the ability to access the location of the assembly. Associated enumeration: FileIOPermissionAccess.PathDiscovery


for the ability to read the file containing the assembly manifest. Associated enumeration: FileIOPermissionAccess.Read


for the ability to access the location of the assembly if the assembly is not local.

.NET Framework
Available since 4.0
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