buckets.cs

// C# equivalent of buckets.swift
using System;
using System.Collections.Generic;

interface IFeed {
	String url { get; }
}

class LocalFeed : IFeed {
	public String url { get; set; }
	public LocalFeed() { this.url = "file://local"; }
}

class RemoteFeed : IFeed {
	public String url { get; set; }
	public RemoteFeed() { this.url = "http://remote"; }
}

class FeedEquality : IEqualityComparer<IFeed> {
	public Boolean Equals(IFeed lhs, IFeed rhs) {
		return lhs.url == rhs.url;
	}
	
	public Int32 GetHashCode(IFeed feed) {
		return feed.url.GetHashCode();
	}
}

class Bucket {
	public ISet<IFeed> feeds = new HashSet<IFeed>(new FeedEquality());
	
	public void Add(IFeed feed) {
		feeds.Add(feed);
	}
}

public class Program
{
	public static void Main()
	{
		var bucket = new Bucket();
		bucket.Add(new LocalFeed());
		bucket.Add(new RemoteFeed());
		
		foreach (var feed in bucket.feeds) {
			Console.WriteLine(feed.url);
		}
	}
}