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C# Dictionary

C# Dictionary

Beginners Guide: Overview, Features, and Learning Path	An overview of C#, the .NET platform, Unity, and how execution works (.cs → csc → IL → CLR), with a recommended learning order for this dictionary.
[Setup] C# Development Environment	Setup instructions for installing and running C#.
Creating and Running .cs Files	How to write and run .cs files.
string.Length / IndexOf()	Gets the length of a string and searches for a character position.
string.Substring() / Remove()	Extracts and removes parts of a string.
string.Replace() / Contains()	Replaces parts of a string and checks for containment.
string.ToUpper() / ToLower() / Trim()	Converts case and removes whitespace.
string.Split() / string.Join()	Splits and joins strings.
string.PadLeft() / PadRight()	Pads and formats strings.
int.Parse() / int.TryParse()	Converts a string to a numeric value.
Convert.ToString() / Convert.ToInt32()	Type conversion utilities.
string.IsNullOrEmpty() / string.IsNullOrWhiteSpace()	Checks whether a string is null or empty.
array.Length / Array.Resize()	Gets the length of an array and resizes it.
Array.Sort() / Array.Reverse()	Sorts and reverses an array.
Array.IndexOf() / Array.Copy()	Searches and copies an array.
List<T>.Add() / Remove() / Clear()	Adds, removes, and clears elements in a list.
List<T>.Insert() / Count	Inserts elements into a list and gets the element count.
List<T>.Contains() / IndexOf()	Searches and checks for elements within a list.
List<T>.Sort() / Reverse() / ForEach()	Sorts, reverses, and loops through a list.
dict.Add() / Remove() / Clear()	Adds and removes keys and values from a dictionary.
dict.TryGetValue() / ContainsKey()	Safely retrieves values and checks for key existence in a dictionary.
dict.Keys / Values / foreach	Retrieves keys and values from a dictionary and loops through them.
Math.Abs() / Math.Round() / Math.Ceiling() / Math.Floor()	Absolute value, rounding, ceiling, and floor operations.
Math.Max() / Math.Min() / Math.Pow() / Math.Sqrt()	Maximum, minimum, power, and square root operations.
Math.PI / Math.E / Random	Constants and random number generation.
Enumerable.Where()	Filters elements that match a condition.
Enumerable.Select()	Transforms each element to generate a new sequence.
Enumerable.OrderBy() / OrderByDescending()	Sorts a sequence.
Enumerable.GroupBy()	Groups elements in a sequence.
Enumerable.Join() / Zip()	Joins two sequences.
Enumerable.First() / Last() / Single()	Retrieves the first, last, or single element.
Enumerable.Count() / Sum() / Average()	Aggregates count, sum, and average.
Enumerable.Any() / All() / Contains()	Evaluates conditions on sequence elements.
Enumerable.Distinct() / Take() / Skip()	Removes duplicates, limits count, and skips elements.
Enumerable.ToList() / ToArray() / ToDictionary()	Converts LINQ query results to a collection.
Enumerable.Aggregate()	Performs cumulative operations.
Enumerable.Range() / Repeat() / Empty()	Generates sequences.
async / await	Defines and awaits asynchronous methods.
Task.Run() / Task.Delay()	Runs tasks and introduces delays.
Task.FromResult() / CancellationToken	Creates immediately completed tasks and handles cancellation.
Exception Handling with async (try/catch with async)	Handles exceptions inside asynchronous methods.
File.ReadAllText() / File.WriteAllText()	Reads and writes an entire text file at once.
File.Exists() / File.Delete() / File.Copy()	Checks existence, deletes, and copies files.
StreamReader / StreamWriter	Reads and writes files line by line using streams.
Directory.Exists() / Directory.CreateDirectory()	Creates and checks directories.
Path.Combine() / Path.GetFileName()	Manipulates path strings.
try / catch / finally	Catches exceptions and performs cleanup.
throw / Custom Exceptions	Throws exceptions and defines custom exception types.
Console.WriteLine() / Console.Write()	Outputs to the console.
Console.ReadLine() / Console.ReadKey()	Reads input from the console.
DateTime.Now / DateTime.Today	Gets the current date and time.
DateTime.Parse() / DateTime.TryParse()	Converts a string to a DateTime value.
dateTime.ToString() / dateTime.AddDays()	Formats a DateTime and adds or subtracts time.
TimeSpan / Date Difference Calculation	Calculates and represents a time interval.
HashSet<T>	A collection that contains no duplicate elements.
Queue<T> / Stack<T>	Queue and stack data structures.
IEnumerable<T> / IList<T>	Base interfaces for collections.
Null Coalescing Operators ?? / ??=	Sets a default value for null and assigns it.
is / as / Pattern Matching	Type checking and conversion.
Nullable<T> / Nullable Types	Allows value types to hold null.
Debug.Log() / Debug.LogError()	Outputs debug information to the console.
GameObject.Find() / GetComponent<T>()	Finds objects and retrieves components in Unity.
Mathf (Unity Math Library)	A set of math functions specific to Unity.
Vector2 / Vector3 Operations	Calculations for 2D and 3D coordinate vectors.
Coroutine / IEnumerator	Splits processing over time using coroutines.
Basic Data Types (C#)	An overview of C# basic data types, covering value/reference types, var type inference, and implicit/explicit conversions.
Comments (C#)	How to write single-line (//), block (/* */), and XML documentation (///) comments in C#.
for Loop (C#)	The basic syntax of the for loop with initialization, condition, and update expressions, plus break and continue.
foreach Statement (C#)	The foreach statement for iterating over arrays and IEnumerable collections without an index variable.
if / else if / else (C#)	The basic conditional branching syntax; C# requires a bool expression in every condition.
Main Method / static (C#)	The Main method as the program entry point, and how the static modifier shares members across instances.
Operators (C#)	Overview of arithmetic, comparison, and logical operators, including integer division behavior and Nullable types.
Pattern Matching (C#)	Type, constant, and property patterns with is, switch expressions, and when guard clauses in C#.
record (C#)	Immutable data types added in C# 9, supporting with expressions, value equality, and Deconstruct.
return Statement (C#)	How return exits a method and returns a value, plus early return, guard clauses, and multi-value returns with tuples.
String Interpolation $"..." (C#)	The $"..." syntax for embedding variables and expressions in strings with {} placeholders and format specifiers.
switch Statement / switch Expression (C#)	Multi-branch switch statement and the switch expression introduced in C# 8, supporting strings, enums, and type patterns.
Ternary / Null-Conditional / Null-Coalescing Operators (C#)	The ternary operator ?: , null-conditional ?. for safe member access, and ?? / ??= for null fallback values.
using (Namespace Import / Resource Disposal) (C#)	Two uses of using: importing namespaces and automatically disposing IDisposable objects.
var (Type Inference) (C#)	How var lets the compiler infer the type from the right-hand side, along with where it can and cannot be used.
while / do-while (C#)	The while loop that runs while a condition is true, and do-while that always executes at least once.

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