Activator.CreateInstance Method (Type, Object[])

May 11, 2014

Creates an instance of the specified type by using the constructor that best matches the specified parameters.

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

public static Object CreateInstance(
	Type type,
	params Object[] args
)

Parameters

type
Type: System.Type
The type of object to create.
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.

Return Value

Type: System.Object
A reference to the newly created object.

ExceptionCondition
ArgumentNullException

type is null.

ArgumentException

type is not a RuntimeType.

-or-

type is an open generic type (that is, the ContainsGenericParameters property returns true).

NotSupportedException

Creation of Void and RuntimeArgumentHandle types, or arrays of those types, is not supported.

-or-

The constructor that best matches args has varargs arguments.

TargetInvocationException

The constructor being called throws an exception.

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.

MissingMethodException

No matching public constructor was found.

COMException

type is a COM object but the class identifier used to obtain the type is invalid, or the identified class is not registered.

TypeLoadException

type is not a valid type.

The type to be created must be accessible. The constructor to be invoked must be accessible and must provide the most specific match with the specified argument list. If you are using DynamicMethod to create a dynamic method, you cannot invoke internal constructors, because the dynamic method is hosted in an anonymous module in a system-provided assembly.

Version Notes

Windows Phone

 For types that do not have constructors defined, the Activator.CreateInstance(Type, Object[]) method throws a MemberAccessException exception instead of a MissingMethodException exception.

If you pass a null object to Activator.CreateInstance(Type, Object[]) on Windows Phone, the method throws NullReferenceException instead of NotSupportedException.

The following code example demonstrates how to call the CreateInstance(Type, Object[]) method. This code example is part of a larger example provided for the Activator class.


// Create an instance of StringBuilder using the constructor that takes a 
// string.
o = Activator.CreateInstance(sbType, new object[]{"Hello, there."});

// Append a string to the StringBuilder object and display the StringBuilder,
// late bound.
sbType.InvokeMember("Append", 
   BindingFlags.Public | BindingFlags.Instance | BindingFlags.InvokeMethod, 
   Type.DefaultBinder, 
   o, new object[] {" And hello again!"});
outputBlock.Text += o.ToString() + "\n";


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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