Lists

Lists are ordered collections that can hold any object. Implements IList<T>. Allows for duplicate items. Inherits from System.Collections.Generic implicitly.
List<T> is not thread safe. Use ImmutableList<T> instead.
For a heterogeneous collection of objects, use List<Object>.

Other Lists

SortedList<TKey, TValue> A collection of key/value pairs that are sorted by key and accessible by key or index.

Creating

Declare a new List of strings:

var names = new List<string>Angle brackets are used for Generics.
// or
var names = new List<string> { "eli", "noah" }Declare and initialize (collection initializer).

Accessing

Lists can be indexed:

names[n]
name[^n] // return the nth item from the end of the list.

Properties

.CountReturns the number of elements in the List.

Methods

Manipulating

.Add(element) // Add element to List.
.AddRange(new[] { elem1, elem2, … }
.Remove(element) // Remove element from List.

Searching

.Contains(element)
.IndexOf(element) // Returns the index of element, or -1 if not found.

Sorting

.Sort() // Sorts the List in place.