Design Question WRT controlling access to private methods

  • Thread starter Thread starter John B
  • Start date Start date
J

John B

I have a situation where I need to control the creation of a class.
I need to be able to create it externally but only by classes that I define.
To accomplish this I thought of the following process:

Define a delegate that returns an instance of my class.
Pass this an instance of this delegate to any classes that I want to be
able to create instances of myclass.

i.e.

//Safe class
using System;
using System.Collections.Generic;
using System.Text;

namespace DelegateCreation
{
public class MySafeClass
{
public delegate MySafeClass CreateMySaveClassDelegate();

private MySafeClass()
{
}

private static MySafeClass Create()
{
return new MySafeClass();
}

public static void Load()
{
List<MySafeClass> instances =
ClassCreator.CreateMySafeClass(new CreateMySaveClassDelegate(Create));
}
}
}

//Class creator
using System;
using System.Collections.Generic;

namespace DelegateCreation
{
public class ClassCreator
{

public static List<MySafeClass>
CreateMySafeClass(MySafeClass.CreateMySaveClassDelegate myDelegate)
{
List<MySafeClass> returnList = new List<MySafeClass>();
returnList.Add(myDelegate.Invoke());
return returnList;
}
}
}
 
John,
I have a situation where I need to control the creation of a class.
I need to be able to create it externally but only by classes that I define.
To accomplish this I thought of the following process:

Define a delegate that returns an instance of my class.
Pass this an instance of this delegate to any classes that I want to be
able to create instances of myclass.
Click to expand...

And your question is what exactly?

The code you posted doesn't seem to fulfill your "only by classes that
I define" requirement. A delegate doesn't add any "security", just a
level of indirection.


Mattias
 
Mattias said:
John,


And your question is what exactly?

The code you posted doesn't seem to fulfill your "only by classes that
I define" requirement. A delegate doesn't add any "security", just a
level of indirection.


Mattias
Click to expand...
Yes it does, because I (MySafeClass) am the only one that can create
this delegate pointing to my (private) Create method.
 
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