Question

I have a static class with number of different methods.

I have another class, and with each instance of this class, I would like it to have a method which calls one of the methods in the static class. For each instance, I want be able to specify which of the methods it will use via the constructor of this class.

Is there a simple way to do this? Should I be using delegates/interfaces?

Answer 1

Do the methods all have the same signature? If so, a delegate would certainly be a good approach… although it wouldn’t restrict the caller to passing in a method group from the static class. If that’s not a problem, here’s a sample:

using System;

public static class TestMethods
{
    public static void Foo(int x)
    {
        Console.WriteLine("Foo " + x);
    }

    public static void Bar(int x)
    {
        Console.WriteLine("Bar " + x);
    }
}

public class DummyClass
{
    private readonly Action<int> action;

    public DummyClass(Action<int> action)
    {
        this.action = action;
    }

    public void CallAction(int start, int end)
    {
        for (int i = start; i < end; i++)
        {
            action(i);
        }
    }
}

class Test
{
    static void Main()
    {
        DummyClass d1 = new DummyClass(TestMethods.Foo);
        DummyClass d2 = new DummyClass(TestMethods.Bar);
        d1.CallAction(2, 4);
        d2.CallAction(3, 7);
    }
}