Contract.Exists<T> Method (IEnumerable<T>, Predicate<T>)
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Determines whether an element within a collection of elements exists within a function.
Namespace: System.Diagnostics.Contracts
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Shared Function Exists(Of T) ( _
collection As IEnumerable(Of T), _
predicate As Predicate(Of T) _
) As Boolean
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.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentNullException | collection or predicate is nulla null reference (Nothing in Visual Basic). |
Version Information
Silverlight
Supported in: 5, 4
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.