How to store functions in Dictionary with uint as key (C#)

Question

Can someone provide me an example of how maybe I store different functions in a dictionary with int as a key and function as value. So then I could easly call function as following:

functionsDictionary[123](string);

Note all functions in dictionary will take only one input which is string. And will have no return.

http://stackoverflow.com/questions/3813261/how-to-store-delegates-in-a-list — Luis, Feb 26 '11 at 07:46
Kinda is duplicate, kinda not. But I forgot to mention that I would like to add functions to dictionary using dictionary.add method. List != Dictionary :P — jM2.me, Feb 26 '11 at 07:53

Jon Skeet · Accepted Answer · 2011-02-26T08:02:35.153

8

It sounds like you're after

Dictionary<int, Action<string>>

or possibly (based on your title)

Dictionary<uint, Action<string>>

Sample:

using System;
using System.Collections.Generic;

class Test
{
    static void Main()
    {
        var dictionary = new Dictionary<int, Action<string>>
        {
            { 5, x => Console.WriteLine("Action for 5: {0}", x) },
            { 13, x => Console.WriteLine("Unlucky for some: {0}", x) }
        };

        dictionary[5]("Woot");
        dictionary[13]("Not really");

        // You can add later easily too
        dictionary.Add(10, x => Console.WriteLine("Ten {0}", x));
        dictionary[15] = x => Console.WriteLine("Fifteen {0}", x);

        // Method group conversions work too
        dictionary.Add(0, MethodTakingString);
    }

    static void MethodTakingString(string x)
    {
    }
}

edited Feb 26 '11 at 08:02

answered Feb 26 '11 at 07:46

Jon Skeet

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How about adding functions with dictionary.Add() ? – jM2.me Feb 26 '11 at 07:51
@user621033: Edited my answer to give an example of that. – Jon Skeet Feb 26 '11 at 07:54
What about adding function name that already exist like here http://pastebin.com/TYfs2u1x – jM2.me Feb 26 '11 at 08:00
@user621033: Your Login method doesn't take a string, so you can't add it like that. However, I've edited my answer to give an example of a method group conversion. – Jon Skeet Feb 26 '11 at 08:03
That's what I missed. Thanks :) – jM2.me Feb 26 '11 at 08:08

score 1 · Answer 2 · answered Feb 26 '11 at 07:46

1

Dictionary<int, Action<string>> _functions = new Dictionary<int, Action<string>>();
_functions[123]("hello");

answered Feb 26 '11 at 07:46

jgauffin

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How to store functions in Dictionary with uint as key (C#)

2 Answers2