So how about truly private fields in C#?

UPDATE: Jim pointed out that you can access the field via reflecting over the delegate.  (See comment) Damn this is a bit like how java does anonymous access to private fields of the parent class. I wonder if you could use this for some nasty security violations as people tend to think local variables are safe from reflection.

After the crazy !@$%  with JavaScript yesterday I said to Christian, I bet we can do this with C# lambda. So the challenge was set….


class Purse
{
    public Func<int> get;
    public Action<int> set;

    public Purse(int money)
    {
        get = () => { return money; };
        set = (newMoney) => { money = newMoney ; };
    }
}

And here is the test …


var p = new Purse(2);
p.set(p.get() + 1);
Assert.AreEqual(3, p.get());

If you tried to use reflection, as expected there is no field to inspect.

One thought on “So how about truly private fields in C#?”

  1. var p = new Purse(2);
    p.set(p.get() + 1);

    int money = (int)p.get.Target.GetType().GetField(“money”).GetValue(p.get.Target);

    Assert.AreEqual(3, money);

    Or am I missing the point?

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