//Define the Adapter Class, Adaptee and Target Classes.

//The Target class (object) represents the class containing the desired class/method behaviour.
public class Target
{
public string Estimate(int i)
{
return "Estimate is " + (int)Math.Round(i / 3.0);
}
}

//The Adaptee class (object) represents the class, in which the behaviour will be modified by the Adapter class (object).
public class Adaptee
{
public double Precise(double a, double b)
{
return a / b;
}
}

The Adapter class (object) defines two constructors, each accepting the pluggable adapter to be used.
public class Adapter
{
public Func<int, string> Request;

public Adapter(Adaptee adaptee)
{
Request = delegate(int i)
{
return "Estimate based on precision is " + (int)Math.Round(adaptee.Precise(i, 3));
};
}

public Adapter(Target target)
{
Request = target.Estimate;
}
}