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What are generic collections in C#?
Generic collections in C# include <List> , <SortedList> , etc.
List
List<T> is a generic collection and the ArrayList is a non-generic collection.
Let us see an example. Here, we have six elements in the list −
Example
using System;
using System.Collections.Generic;
class Program {
static void Main() {
// Initializing collections
List myList = new List() {
"one",
"two",
"three",
"four",
"five",
"six"
};
Console.WriteLine(myList.Count);
}
}Output
6
SortedList
A sorted list is a combination of an array and a hash table. It contains a list of items that can be accessed using a key or an index.
Let us see an example. Here, we have four elements in the SortedList −
Example
using System;
using System.Collections;
namespace CollectionsApplication {
class Program {
static void Main(string[] args) {
SortedList sl = new SortedList();
sl.Add("001", "Tim");
sl.Add("002", "Steve");
sl.Add("003", "Bill");
sl.Add("004", "Tom");
if (sl.ContainsValue("Bill")) {
Console.WriteLine("This name is already in the list");
} else {
sl.Add("005", "James");
}
ICollection key = sl.Keys;
foreach (string k in key) {
Console.WriteLine(k + ": " + sl[k]);
}
}
}
}Output
This name is already in the list 001: Tim 002: Steve 003: Bill 004: Tom
Updated on: 20-Jun-2020
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