C# | Strings | .Contains() | Codecademy (2024)

The .Contains() method determines whether a string includes a particular character or substring. It returns true if the character is included, otherwise the method returns false. There are additional parameters that can modify the comparison rules.

Syntax

// Determines whether the String includes a given characterString.Contains(char);// Determines whether the String includes a given stringString.Contains(string);// Determines whether the String includes a given character considering the type of comparisonString.Contains(char, comparisonType)// Determines whether the String includes a given string considering the type of comparisonString.Contains(string, comparisonType)

.Contains() takes the following arguments:

char is a single character.
string is a sequence of characters.
comparisonType is an enumeration value that allows to add specific rules to compare strings such as culture, case, and sort. Passing as an additional argument:
CurrentCulture determines whether strings match culture-sensitive criteria.
CurrentCultureIgnoreCase same as above and ignores the case.
InvariantCulture determines whether strings match culture-sensitive criteria and the invariant culture.
InvariantCultureIgnoreCase same as above and ignores the case.
Ordinal determines whether strings match using binary sort rules.
OrdinalIgnoreCase same as above and ignores the case.

Example

The following example shows how we can use .Contains() method

using System;
public class Example
{
 public static void Main()
 {
 string stringToSeek = "The distance is nothing when one has a motive.";
 string substring = "motive";
 char character = 'l';
 bool result;
See Also
How to Get Value from HashTable Collection in C# using Specified KeyHow to check if a hash contains a particular key in RubyC# | Check if a SortedList object contains a specific value - GeeksforGeeksHow to determine if a value exists in a linked list in C#
 // String.Contains(string)
 result = stringToSeek.Contains(substring);
 Console.WriteLine(result);
 // String.Contains(char)
 result = stringToSeek.Contains(character);
 Console.WriteLine(result);
 }
}

Here is the following output:

True
False

Codebyte Example

The example below determines whether the word helpful is included in the particular string.

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See Also
How to check if a particular value exists in a Hash in Ruby

C# | Strings | .Contains() | Codecademy (2024)

FAQs

How to use the contains() method in C#? ›

Basic Syntax for Contains() Method

//YourString is the string you want to check //CheckString is the string you want to find bool result = YourString. Contains(CheckString); The function returns true if CheckString is found within YourString , and false if it is not. As simple as that!

Read On ›

How to check if a string has certain characters in C#? ›

In C#, String. Contains() is an instance method of the String class. It is used to find whether a given string contains characters. If it finds a matching substring in this particular string, it returns True .

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How to check for a substring in C#? ›

The . Contains() method determines whether a string includes a particular character or substring. It returns true if the character is included, otherwise the method returns false . There are additional parameters that can modify the comparison rules.

How to get a portion of a string in C#? ›

You call the Substring(Int32) method to extract a substring from a string that begins at a specified character position and ends at the end of the string.

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What does using () do in C#? ›

In C#, using statements define a new scope block. Any variables declared inside of a using statement are local to that block. At the end of that new scope the dispose method for that object is called. Another way to ensure the correct use of disposable classes is to use a try-finally block.

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How to use where () in C#? ›

The “where” Keyword in C#

This keyword is typically used in conjunction with the “IEnumerable” interface to filter data based on a specific condition. var numbers = new List<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; var evenNumbers = numbers. Where(n => n % 2 == 0);

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What is trim() in C#? ›

C# Trim() is a string method. This method is used to removes all leading and trailing white-space characters from the current String object. This method can be overloaded by passing arguments to it. Syntax: public string Trim() or public string Trim (params char[] trimChars)

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How to check if a string ends with a substring in C#? ›

To determine whether a string ends with a particular substring by using the string comparison rules of the current culture, signal your intention explicitly by calling the EndsWith(String, StringComparison) method overload with a value of CurrentCulture for its comparisonType parameter.

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How do I check if a string contains a substring? ›

You can use JavaScript's includes() method to check whether a string contains a substring. This will return true if the substring is found, or false if not.

What is the alternative to substring in C#? ›

Spans are a newer alternative to substrings in C#. They provide a more efficient way to manipulate strings. A span is essentially a “view” of a portion of a larger array or string, without actually creating a new instance of that portion.

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How to find all substrings of a given string in C#? ›

Given a string as an input we need to find all the substrings present in the given string. We can find all the substrings from the given string using the Substring() method. This method returns a substring from the current string.

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Why use substring in C#? ›

A substring is a part, or a portion of the original string. Think of it like taking a slice out of pie, but that pie is text, and the pie slice is the substring. In C#, the Substring method allows you to get this slice without crumbing the entire pie.

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How does the Contains method work? ›

contains() method is declared in the List interface and implemented in the ArrayList class. It is used to check if the element is present in the specified ArrayList or not. The function returns a boolean value of true if the element is present and false if not.

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What is the contains method of a List in C#? ›

public bool Contains (T item); Here, item is the object which is to be locate in the List<T>. The value can be null for reference types. Return Value: This method returns True if the item is found in the List<T> otherwise returns False.

Why we are using Contains in C#? ›

Contains(Char, StringComparison)

Returns a value indicating whether a specified character occurs within this string, using the specified comparison rules.

How to check if a file contains string in C#? ›

Contains() Method. In C#, String. Contains() is a string method. This method is used to check whether the substring occurs within a given string or not.

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