Polymorphic Enums for state handling

Question

how do i handle Enums without using switch or if statements in C#?

For Example

enum Pricemethod
{
    Max,
    Min,
    Average
}

... a

Answer 1

You could create an interface, and classes that implement it:

public interface IPriceMethod
{
    double Calculate(IList priceHistorie);
}
public class AveragePrice : IPriceMethod
{
    public double Calculate(IList priceHistorie)
    {
        return priceHistorie.Average();
    }
}
// other classes
public class Article 
{
    private List _pricehistorie;

    public List Pricehistorie
    {
        get { return _pricehistorie; }
        set { _pricehistorie = value; }
    }

    public IPriceMethod Pricemethod { get; set; }

    public double Price
    {
        get {
            return Pricemethod.Calculate(Pricehistorie);
        }
    }

}

Edit: another way is using a Dictionary to map Funcs, so you don't have to create classes just for this (this code is based on code by Servy, who since deleted his answer):

public class Article
{
    private static readonly Dictionary, double>>
        priceMethods = new Dictionary, double>>
        {
            {Pricemethod.Max,ph => ph.Max()},
            {Pricemethod.Min,ph => ph.Min()},
            {Pricemethod.Average,ph => ph.Average()},
        };

    public Pricemethod Pricemethod { get; set; }
    public List Pricehistory { get; set; }

    public double Price
    {
        get
        {
            return priceMethods[Pricemethod](Pricehistory);
        }
    }
}