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what is List?

Maha

In this example List is given a type 'int' so that can we say List does not have type. If so, what is List. Problem is heighlited.

using System;
using System.Collections.Generic;

class Program
{
static void Main()
{
List oyears = new List();
oyears.Add(1990);
oyears.Add(1991);
oyears.Add(1992);
oyears.Add(1993);
oyears.Add(2001);
oyears.Add(2002);
oyears.Add(2003);

foreach (int item in oyears)
{
Console.WriteLine(item);
}
Console.ReadKey();
}
}

2 Replies

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Vulpes11y ago
Accepted answer
List is what's called a 'generic' type.

This means that you can replace the 'type parameter', T, with any actual type and it will then give you a list of that type.

So List is a list of 4 byte integers.

Generic types save code and reduce complication. If we didn't have them and you wanted a llst of bool say, then you'd have to create a separate class for that even though the code would essentially be just the same as for a list of int.
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Maha11y ago
Thank you for your explanation.
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