Using attribute to create an instance of class

Question

I have 2 fields like

private IFruit fruit;
private Banana banana;

An instance of Banana is created like this:

var banana = new Banana(fruit);

I want to create an attribute for Banana fields to do the job of creating Banana instance for me!

Google for dependency injection. It does what you are looking for. — leppie
– leppie, Commented Jul 12, 2011 at 9:17
not really clear what you want, sorry. Can you, please, redifine yuor question ? — Tigran
– Tigran, Commented Jul 12, 2011 at 9:18
You could also look into the Factory pattern. But still your question is not clear enough to give a good answer. — dowhilefor
– dowhilefor, Commented Jul 12, 2011 at 9:20

C.Evenhuis · Accepted Answer · 2011-07-12 09:20:18Z

1

Attributes don't cause any code to be executed - you'll have to use reflection to access them. If you want you could implement a base class that has this behavior, and add the reflection code to the constructor:

abstract class AutoCreateBase
{
    public MyBase()
    {
        // Reflection to go through the fields, find the attributes, and use Activator.CreateInstance() on each
    }
}

class MyClass : AutoCreateBase
{
    [AutoCreate]
    private Banana banana;
}

answered Jul 12, 2011 at 9:20

C.Evenhuis

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Comments

Boas Enkler · Accepted Answer · 2011-07-13 07:47:52Z

0

Also some container like unity offer this functionality

answered Jul 13, 2011 at 7:47

Boas Enkler

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