.Contains()

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 character
String.Contains(char);

// Determines whether the String includes a given string
String.Contains(string);

// Determines whether the String includes a given character considering the type of comparison
String.Contains(char, comparisonType)

// Determines whether the String includes a given string considering the type of comparison
String.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;

        // 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.

us
Visit us
code
Hide code
Code
Output
Hide output
Hide output
Loading...
Run