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Contract.Exists<T> Method (IEnumerable<T>, Predicate<T>)

Determines whether an element within a collection of elements exists within a function.

Namespace:  System.Diagnostics.Contracts
Assembly:  mscorlib (in mscorlib.dll)

public static bool Exists<T>(
	IEnumerable<T> collection,
	Predicate<T> predicate
)

Type Parameters

T

The type that is contained in collection.

Parameters

collection
Type: System.Collections.Generic.IEnumerable<T>

The collection from which elements of type T will be drawn to pass to predicate.

predicate
Type: System.Predicate<T>

The function to evaluate for an element in collection.

Return Value

Type: System.Boolean
true if and only if predicate returns true for any element of type T in collection.

ExceptionCondition
ArgumentNullException

collection or predicate is null.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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