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C# ContainsKey Method (Key Exists in Dictionary)
Use the ContainsKey method on the Dictionary to test for key existence.ContainsKey. This is a Dictionary method. It computes the hash code for its argument. It then checks the internal structures in the Dictionary to see if that key exists.ContainsValueTryGetValue
Method notes. ContainsKey is extremely fast. It does no linear searching. It uses a hash code to estimate where the data is stored.GetHashCode
An example. You will find the ContainsKey method on a Dictionary. In Visual Studio, try typing the variable name and pressing period, and then scrolling to ContainsKey.Dictionary
Info: The program populates the Dictionary with 2 key-value pairs. ContainsKey is invoked twice.
Argument: The ContainsKey method receives one parameter. This is the key we wish to check for.
Returns: ContainsKey returns a Boolean value that indicates whether the key was found in the Dictionary or not.
BoolAnd: You can test ContainsKey in an if-statement. It will not throw exceptions on a key that is not found.
IfTrue, FalseC# program that uses ContainsKey
using System;
using System.Collections.Generic;
class Program
{
static void Main()
{
// Create Dictionary with two key value pairs.
var dictionary = new Dictionary<string, int>()
{
{"mac", 1000},
{"windows", 500}
};
// Use ContainsKey method.
if (dictionary.ContainsKey("mac") == true)
{
Console.WriteLine(dictionary["mac"]); // <-- Is executed
}
// Use ContainsKey method on another string.
if (dictionary.ContainsKey("acorn"))
{
Console.WriteLine(false); // <-- Not hit
}
}
}
Output
1000
Internals. The .NET Framework implements the ContainsKey method. Dictionary has a FindEntry() method which loops over the entries in the Dictionary that are pointed to by the buckets array.
And: When it finds a matching hash code, it compares the key values and then returns the actual value.
Returns: The ContainsKey method discards some of the values it finds and simply returns a Boolean.
Therefore: Using TryGetValue can be used to perform these operations at one time, improving runtime speed.
Benchmark. A benchmark of ContainsKey compared to ContainsValue shows that ContainsKey is many times faster (the exact amount depends on the Dictionary size). This is important to know.
A summary. ContainsKey checks for a key's existence. Dictionary implements a lightning-fast lookup table. But it will throw exceptions if you try to access an entry when no key exists.
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- C# Static Array
- C# Static Dictionary
- C# Stopwatch Examples
- C# Stream
- C# StreamReader ReadToEnd Example (Read Entire File)
- C# StreamReader ReadToEndAsync Example (Performance)
- C# StreamReader Examples
- C# StreamWriter Examples
- C# String Append (Add Strings)
- C# String Compare and CompareTo Methods
- C# String Constructor (new string)
- C# string.Copy Method
- C# CopyTo String Method: Put Chars in Array
- C# Empty String Examples
- C# String Equals Examples
- C# String For Loop, Count Spaces in String
- C# string.Intern and IsInterned
- C# String IsUpper, IsLower
- C# String Length Property: Get Character Count
- C# String Literal: Newline and Quote Examples
- C# StringBuilder Capacity
- C# StringBuilder Clear (Set Length to Zero)
- C# StringBuilder Data Types
- C# StringBuilder Performance
- C# StringBuilder Equals (If Chars Are Equal)
- C# StringBuilder Memory
- C# StringBuilder ToString: Get String From StringBuilder
- C# StringWriter Class
- C# Sum Method: Add up All Numbers
- C# Switch Char, Test Chars With Cases
- C# Switch Enum
- C# System (using System namespace)
- C# Tag Property: Windows Forms
- C# TextInfo Examples
- C# TextReader, Returned by File.OpenText
- C# TextWriter, Returned by File.CreateText
- C# this Keyword
- C# ThreadPool
- C# Thread Join Method (Join Array of Threads)
- C# ThreadPool.SetMinThreads Method
- C# TimeZone Examples
- C# Get Title From HTML With Regex
- C# ToArray Extension Method
- C# ToCharArray: Convert String to Array
- C# ToDictionary Method
- C# Token
- C# ToList Extension Method
- C# ToLookup Method (Get ILookup)
- C# ToLower and ToUpper: Uppercase and Lowercase Strings
- ToolStripContainer Control: Dock, Properties
- C# ToolTip: Windows Forms
- C# ToString Integer Optimization
- C# ToString: Get String From Object
- C# ToTitleCase Method
- C# TrackBar: Windows Forms
- C# Tree and Nodes Example: Directed Acyclic Word Graph
- C# TreeView Tutorial
- C# Trim Strings
- C# Thread Methods
- C# History
- C# Features
- C# Variables
- C# Data Types
- C# Operators
- C# Keywords
- C# New Features | C# Version Features
- C# Programs
- C# Program to swap numbers without third variable
- C# Program to convert Decimal to Binary
- C# Program to Convert Number in Characters
- C# Program to Print Alphabet Triangle
- C# Program to print Number Triangle
- C# Program to generate Fibonacci Triangle
- C# String Compare() method
- C# String CompareOrdinal() method
- C# String CompareTo() method
- C# String Concat() method
- C# String Contains() method
- C# String CopyTo() method
- C# String EndsWith() method
- C# String Equals() method
- C# String Format() method
- C# String IndexOf() method
- C# String Insert() method
- C# String Intern(String str) method
- C# String IsInterned() method
- C# String Normalize() method
- C# String IsNullOrEmpty() method
- C# String IsNullOrWhiteSpace() method
- C# String Join() method
- C# String LastIndexOf() method
- C# String LastIndexOfAny() method
- C# String PadLeft() method
- C# String PadRight() method
- C# Nullable
- C# String Remove() method
- C# String Replace() method
- C# String Split() method
- C# String StartsWith() method
- C# String SubString() method
- C# Partial Types
- C# Iterators
- C# Delegate Covariance
- C# Delegate Inference
- C# Anonymous Types
- C# Extension Methods
- C# Query Expression
- C# Partial Method
- C# Implicitly Typed Local Variable
- C# Object and Collection Initializer
- C# Auto Implemented Properties
- C# Dynamic Binding
- C# Named and Optional Arguments
- C# Asynchronous Methods
- C# Caller Info Attributes
- C# Using Static Directive
- C# Exception Filters
- C# Await in Catch Finally Blocks
- C# Default Values for Getter Only Properties
- C# Expression Bodied Members
- C# Null Propagator
- C# String Interpolation
- C# nameof operator
- C# Dictionary Initializer
- C# Pattern Matching
- C# Tuples
- C# Deconstruction
- C# Local Functions
- C# Binary Literals
- C# Ref Returns and Locals
- C# Expression Bodied Constructors and Finalizers
- C# Expression Bodied Getters and Setters
- C# Async Main
- C# Default Expression