6237 Programmering II (Csharp) Agenda/Dictionary

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Dictionary

Hvis vi gerne vil tælle hvor mange gange en bestemt webadresse forekommer kan vi anvende dictionary. Et dictionary virker som et array, men i stedet for at indekserer med et tal kan man anvende en string.


IDictionary<string, int> web = new Dictionary<string, int>();
web["www.facebook.com"] = 10;
web["www.dr.dk"] = 20;
web["www.google.com"] = 30;


Hvis vi vil bruge det til at tælle forekomster af en adresse kunne det foregå sådan her.


class Program
{
	static IDictionary<string, int> web;
	static void AddWebAddress(String address)
	{
		if (web.ContainsKey(address)) web[address]++;
		else web[address] = 1;
	}

	static void Main(string[] args)
	{
		web = new Dictionary<string, int>();
		AddWebAddress("www.google.com");
		AddWebAddress("www.facebook.com");
		AddWebAddress("www.google.com");
		AddWebAddress("www.dr.com");
		AddWebAddress("www.google.com");
		AddWebAddress("www.facebook.com");
		
		foreach(string key in web.Keys)
		{
			System.Console.WriteLine("Adressen {0} optræder {1} gange", key, web[key]);
		}
	}
}