do this without using an “if” | if(s == “value1”){…} else if(s == “value2”) { …}

Question

According to anti-if campaign it is a best practice not to use ifs in our code. Can anyone tell me if it possible to get rid of the if in this piece of code ? (switch is also

Answer 1

A little late to the party, but combining the C# dictionary answers from MRFerocius and cletus gives the following implementation of bmargulies's answer:

private Dictionary data = new Dictionary {
    {"foo", () => Console.WriteLine("Some logic here")},
    {"bar", () => Console.WriteLine("something else here")},
    {"raboof", () => Console.WriteLine("of course I need more than just WriteLine")},
}

public static void main(String[] args) {
    data["foo"]();
}

• If the key doesn't exist in the dictionary, using it in the indexer will throw an exception.

• Multiple actions can be composed:

  • There can be multiple calls to different methods, using multiline lambda syntax:

    {"foobar", () => { data["foo"](); data["bar"](); }

  • As Action is a delegate type, multiple methods can be attached to a single delegate instance and that delegate instance set as the value; they will be called sequentially when the delegate is invoked:

    public static void main(String[] args) { data["foobar"] = data["foo"] + data["bar"]; //This will invoke first data["foo"] then data["bar"] data["foobar"](); }

    For methods not referenced via the dictionary, this can also be done in the collection initializer:

    {"foobar", (Action)method1 + method2}