Dictionary C# [portable] (2026)

Removes the entry with the specified key from the collection.

A dictionary is a generic collection that maps keys to values. It is found in the System.Collections.Generic namespace and works similarly to a real-world dictionary where you look up a "word" (key) to find its "definition" (value). must be unique and cannot be null . Values can be duplicated or null . dictionary c#

Returns the number of key-value pairs currently in the dictionary. Removes the entry with the specified key from the collection

: Under the hood, it uses a hash table , making most operations (constant time). Getting Started: Basic Syntax must be unique and cannot be null

Safely attempts to get a value; returns true if found, false otherwise. Removes all keys and values from the dictionary. Iterating Through a Dictionary

C# Dictionary: How to Create One and Best Practices - Stackify