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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


The type that is contained in collection.


Type: System.Collections.Generic.IEnumerable<T>
The collection from which elements of type T will be drawn to pass to 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.


collection or predicate is null.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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