Lazy with expiration time

Question

I want to implement an expiration time on a Lazy object. The expiration cooldown must start with the first retrieve of the value. If we get the value, and the expiration time is

Answer 1

I don't think Lazy would have any influence here, it's more like a general approach, essentially being similar to the singleton pattern.

You'll need a simple wrapper class which will either return the real object or pass all calls to it.

I'd try something like this (out of memory, so might include bugs):

public class Timed where T : new() {
    DateTime init;
    T obj;

    public Timed() {
        init = new DateTime(0);
    }

    public T get() {
        if (DateTime.Now - init > max_lifetime) {
            obj = new T();
            init = DateTime.Now;
        }
        return obj;
    }
}

To use, you'd then just use Timed obj = new Timed(); rather than MyClass obj = new MyClass();. And actual calls would be obj.get().doSomething() instead of obj.doSomething().

Edit:

Just to note, you won't have to combine an approach similar to mine above with Lazy because you're essentially forcing a delayed initialization already. You could of course define the maximum lifetime in the constructor for example.