EnumerableContains Method

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Determines whether a sequence contains a specified element by using the default equality comparer.

Namespace:   System.Linq
Assembly:  System.Core (in System.Core.dll)

public static bool Contains<TSource>(
	this IEnumerable<TSource> source,
	TSource value
generic<typename TSource>
static bool Contains(
	IEnumerable<TSource>^ source,
	TSource value
static member Contains<'TSource> : 
        source:IEnumerable<'TSource> *
        value:'TSource -> bool
Public Shared Function Contains(Of TSource) (
	source As IEnumerable(Of TSource),
	value As TSource
) As Boolean



A sequence in which to locate a value.

Type: TSource

The value to locate in the sequence.

Return Value


true if the source sequence contains an element that has the specified value; otherwise, false.

Type Parameters


The type of the elements of source.

Exception Condition

source is null.

If the type of source implements ICollection, the Contains method in that implementation is invoked to obtain the result. Otherwise, this method determines whether source contains the specified element.

Enumeration is terminated as soon as a matching element is found.

Elements are compared to the specified value by using the default equality comparer, .

The following code example demonstrates how to use Contains to determine whether an array contains a specific element.

string[] fruits = { "apple", "banana", "mango", "orange", "passionfruit", "grape" };

string fruit = "mango";

bool hasMango = fruits.Contains(fruit);

    "The array {0} contain '{1}'.",
    hasMango ? "does" : "does not",

// This code produces the following output:
// The array does contain 'mango'. 
' Create an array of strings.
Dim fruits() As String = {"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' This is the string to search the array for.
Dim fruit As String = "mango"

' Determine if the array contains the specified string.
Dim hasMango As Boolean = fruits.Contains(fruit)

Dim text As String = IIf(hasMango, "does", "does not")

' Display the output.
MsgBox("The array " & text & " contain " & fruit)

' This code produces the following output:
' The array does contain mango
Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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