Activator.CreateInstance MissingMethodException

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2 total messages Started by Raul Lorenzo Wed, 01 Nov 2006 11:46

#191

Author: Raul Lorenzo
Date: Wed, 01 Nov 2006 11:46

48 lines
2139 bytes

Hello,

I am trying creating a class dynamically at runtime with
Activator.CreateInstance(ObjType); where ObjType is retrieved through

foreach (Type tipo in ass.GetTypes())
{
ObjType=tipo.GetType();
tmp=(IPlugin)Activator.CreateInstance(ObjType);
}

ObjType is "linked" with per example this class

public class PersonaUserControlController:AbstractUserControlController
	{
	private IAlumnosUseCase model;
	private IPersonaUserControl view;
	public PersonaUserControlController()
		{
		//
		// TODO: Add constructor logic here
		//
		this.model =
(IAlumnosUseCase)UseCaseFactory.getInstance().getUseCase("AlumnosUseCase");
		this.view =
(IPersonaUserControl)UserControlFactory.getInstance().getUserControl("PersonaUserControl");
		plugin_name = "PersonaUserControl";
		ConfigureMenu();
		}
	...more methods but only one constructor
	}

/***************************************************************/
I think this could help....

abstract public class
AbstractUserControlController:AbstractPlugin,IUserControlController
		{
		}

abstract public class AbstractPlugin:IPlugin
	{
	}

/***************************************************************/
Why did exception raises if one constructor exists and without parameters?

Thanks in advance

Re: Activator.CreateInstance MissingMethodException

#192

Author: Joanna Carter [TeamB]
Date: Wed, 01 Nov 2006 17:45

39 lines
1917 bytes

"Raul Lorenzo" <rlorenb@agalisa.es> a �crit dans le message de news: 
4548891f$1@newsgroups.borland.com...

| I am trying creating a class dynamically at runtime with
| Activator.CreateInstance(ObjType); where ObjType is retrieved through
|
| foreach (Type tipo in ass.GetTypes())
| {
| ObjType=tipo.GetType();
| tmp=(IPlugin)Activator.CreateInstance(ObjType);
| }

I think your problem is that you are getting the type of System.Type !!

foreach (Type tipo in ass.GetTypes())
{

  // assuming tipo now contains the type that you want to create...

| ObjType=tipo.GetType();

  // ObjType now contains System.Type as that would be the type of tipo.

| tmp=(IPlugin)Activator.CreateInstance(ObjType);
| }

I think you need to remove one line of code like this :

foreach (Type tipo in ass.GetTypes())
{

  tmp=(IPlugin)Activator.CreateInstance(tipo);
}

Joanna

-- 
Joanna Carter [TeamB]
Consultant Software Engineer

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