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C# Contains String Method
Use the Contains method on the string type. Examine the implementation of Contains.Contains. This method searches strings. It checks if one substring is contained in another. It also provides a case-sensitive ordinal method for checking string contents.Strings
Contains returns true or false, not an index. It is the same as calling IndexOf and testing for -1 on your own. But Contains can be clearer to read.IndexOf
Example. Contains is an instance method—you can call it on a specific string in your program. It has a bool result, which is true if the parameter is found, and false if it is not found.Bool
Next: The example program shows that Contains is case-sensitive. It shows how to test the result of Contains.
Test: We call the Test method 2 times. In that method, the output is printed the console.
And: The string "Net" is first tested with Contains. Contains is case-sensitive.
Info: Test() shows how to test Contains for true and false. We can store the result in a bool.
True, FalseIfC# program that uses Contains
using System;
class Program
{
static void Main()
{
Test("The Dev Codes");
Test("dot net Codex");
}
static void Test(string input)
{
Console.Write("--- ");
Console.Write(input);
Console.WriteLine(" ---");
//
// See if the string contains 'Net'
//
bool contains = input.Contains("Net");
//
// Write the result
//
Console.Write("Contains 'Net': ");
Console.WriteLine(contains);
//
// See if the string contains 'Codex' lowercase
//
if (input.Contains("Codex"))
{
Console.WriteLine("Contains 'Codex'");
}
//
// See if the string contains 'Dot'
//
if (!input.Contains("Dot"))
{
Console.WriteLine("Doesn't Contain 'Dot'");
}
}
}
Output
--- The Dev Codes ---
Contains 'Net': True
--- dot net Codex ---
Contains 'Net': False
Contains 'Codex'
Doesn't Contain 'Dot'
Internals. Contains calls IndexOf. When IndexOf returns -1, the string was not found. When Contains cannot find the string, it returns false. Contains offers no performance advantage.
Tip: In IL Disassembler, we see how Contains is implemented. A screenshot of Contains is provided.
IL DisassemblerOrdinal. This refers to a position number. When used with strings, it means that the characters are treated as numbers, not symbols.
And: With StringComparison.Ordinal, all language characters are treated the same—regardless of the system locale.
Performance. Ordinal comparisons on strings are much faster than culture-dependent comparisons. This makes sense because it is easier for the system to compare numbers than symbols.
Summary. The simplest method to perform a task is often the best one. Contains is a simplified version of IndexOf. It allows you to easily check whether a string is contained in another.
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- C# sizeof Keyword
- C# Skip and SkipWhile Examples
- C# Sleep Method (Pause)
- C# Sort Dictionary: Keys and Values
- C# Sort by File Size
- C# Sort, Ignore Leading Chars
- C# Sort KeyValuePair List: CompareTo
- C# Sort Strings by Length
- C# Thread.SpinWait Example
- C# Math.Sqrt Method
- C# stackalloc Operator
- C# StackOverflowException
- C# StartsWith and EndsWith String Methods
- 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