Simpler.NetCore.Collections

Extension methods

.ForEach(Action)

A fluent alternative to foreach (var element in collection) { action(element); }.

new [] { 1, 2, 3 }.ForEach(n => Console.WriteLine(n));

.GetOr(key, fallback, acceptNulls)

Retrieve a value from a dictionary, or a fallback value if key is not present or is null (depending on acceptNulls).

var i = new Dictionary<String, Int32> { { "a", 1 } };
i.GetOr("a", 2)       // 1
i.GetOr("b", 2)       // 2
i.GetOr("c", default) // 0

var o = new Dictionary<String, Object?> { { "a", "x" }, { "b", null } };
o.GetOr("a", "y")                    // "x"
o.GetOr("b", "y")                    // "y"
o.GetOr("b", "y", acceptNulls: true) // null
o.GetOr("c", default!)               // null

.GetOrAdd(key, value, acceptNulls)

Retrieve a value from a dictionary, adding it if key is not present or is null (depending on acceptNulls).

var d = new Dictionary<String, Int32?> { { "a", 1 }, { "b", null }, { "c", null } };
d.GetOrAdd("a", 0)                    // 1
d.GetOrAdd("b", 2)                    // 2
d.GetOrAdd("c", 3, acceptNulls: true) // null

.IsOneOf

A fluent alternative to Enumerable.Contains.

Usage:

"x".IsOneOf(new List<String> { "a", "b", "c" }); // false
"b".IsOneOf("a", "b", "c");                      // true

.StringJoin

A fluent alternative to String.Join.

Usage:

new []{"a","b","c"}.StringJoin();     // "abc"
new []{"a","b","c"}.StringJoin(", "); // "a, b, c"

.ToDictionary

Parameter-less conversion of any collection of key-value pairs to a dictionary.

new List<KeyValuePair<String, Int32>>{
  new KeyValuePair<String, Int32>("a", 1)
}.toDictionary(); // { "a": 1 }

Nil

Contains shorthand methods and properties for instantiating common collections.

Methods

• .E() creates an empty Enumerable.
• .C() creates an empty Collection.
• .L() creates an empty List.
• .S() creates an empty HashSet.
• .D() creates an empty Dictionary.

Properties

*Str properties for each type instantiate the corresponding collection of Strings. For Dictionary it's DStr<TValue>, which creates a dictionary of String keys and TValue values.