Activator Createinstance - joarchives98’s diary

I m using RedGate to do some performance evaluation. I notice dynamically creating an instance using Activator.CreateInstance with two constructor parameters is.

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

assemblyName

Type:

System.String

The name of the assembly where the type named typeName is sought. For more information, see the Remarks section. If assemblyName is null, the executing assembly is searched. typeName

The fully qualified name of the preferred type.

Exception

Condition

ArgumentNullExceptionMissingMethodException

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

You 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. InvalidComObjectExceptionNotSupportedExceptionBadImageFormatException

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.

The assembly name or code base is invalid.

Use ObjectHandle.Unwrap to unwrap the return value.

assemblyName can be either of the following:

The simple name of an assembly, without its path or file extension. For example, you would specify TypeExtensions for an assembly whose path and name are. bin TypeExtensions.dll.

The full name of a signed assembly, which consists of its simple name, version, culture, and public key token; for example, TypeExtensions, Version 1.0.0.0, Culture neutral, PublicKeyToken 181869f2f7435b51.

For more information on how the common language runtime identifies and loads assemblies, see How the Runtime Locates Assemblies. For information on using the application configuration file to define assembly locations, see Specifying an Assembly s Location. If assemblyName is found, it is loaded in the default context.

The following example defines a class named Person in an assembly named PersonInfo. Note that the Person class has two constructors, one of which is parameterless.

using System;

public class Person

private string _name;

public Person

public Person string name

this._name name;

public string Name

get return this._name;

set this._name value;

public override string ToString

return this._name;

The following example calls the CreateInstance String, String method to instantiate the Person class. It requires a reference to PersonInfo.dll to be added to the project. Because the CreateInstance String, String method calls the Person class default constructor, the example assigns a value to its Name property.

using System.Runtime.Remoting;

public class Example

public static void Main

ObjectHandle handle Activator.CreateInstance PersonInfo, Person ;

Person p Person handle.Unwrap ;

p.Name Samuel ;

Console.WriteLine p ;

// The example displays the following output:

// Samuel

.NET Framework

Available since 1.1

CreateInstance Overload

Activator Class

System Namespace

Return to top

Show:

Inherited

Protected.

Update: It appears that the access modifiers on TestClass affect the performance of Activator.CreateIntance. My bet would be due to access checks of some.

Gists are just like any repository. 01 May 2015 I was editing a gist recently when I thought. There s got to be a better way. So I tried to clone my gist from the.

Nov 17, 2005 Daniel Moth asked, in his post, how to choose between a generic type parameter vs. a formal parameter of typed as System.Type. For example, the following.

Reflection Examples C This example shows how to dynamically load assembly, how to create object instance, how to invoke method or how to get and set property value.

Just as an example how to add initialization in the constructor: Something similar to: Activator.CreateInstance Type.GetType ConsoleApplication1.Operation1.

Activator.CreateInstance Method (String, String) (System)

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

System

Assembly:

mscorlib in mscorlib.dll NameDescriptionCreateInstance ActivationContext

Creates an instance of the type designated by the specified ActivationContext object.CreateInstance ActivationContext, String

Creates an instance of the type that is designated by the specified ActivationContext object and activated with the specified custom activation data.CreateInstance AppDomain, String, String

Creates an instance of the type whose name is specified in the specified remote domain, using the named assembly and default constructor.CreateInstance AppDomain, String, String, Boolean, BindingFlags, Binder, Object, CultureInfo, Object

Creates an instance of the type whose name is specified in the specified remote domain, using the named assembly and the constructor that best matches the specified parameters.CreateInstance AppDomain, String, String, Boolean, BindingFlags, Binder, Object, CultureInfo, Object, Evidence

Obsolete.Creates an instance of the type whose name is specified in the specified remote domain, using the named assembly and the constructor that best matches the specified parameters.CreateInstance String, String

Creates an instance of the type whose name is specified, using the named assembly and default constructor.CreateInstance String, String, Boolean, BindingFlags, Binder, Object, CultureInfo, Object

Creates an instance of the type whose name is specified, using the named assembly and the constructor that best matches the specified parameters.CreateInstance String, String, Boolean, BindingFlags, Binder, Object, CultureInfo, Object, Evidence

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

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

Creates an instance of the specified type using that type s default constructor.CreateInstance Type, BindingFlags, Binder, Object, CultureInfo

Creates an instance of the specified type using the constructor that best matches the specified parameters.CreateInstance Type, BindingFlags, Binder, Object, CultureInfo, Object

Creates an instance of the specified type using the constructor that best matches the specified parameters.CreateInstance Type, Boolean

Creates an instance of the specified type using that type s default constructor.CreateInstance Type, Object

Creates an instance of the specified type using the constructor that best matches the specified parameters.CreateInstance Type, Object, Object

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

Creates an instance of the type designated by the specified generic type parameter, using the parameterless constructor.