Contract.Exists Method

Definition

Namespace:

System.Diagnostics.Contracts

Assembly:

System.Diagnostics.Contracts.dll

Overloads

Exists(Int32, Int32, Predicate<Int32>)	Determines whether a specified test is true for any integer within a range of integers.
Exists<T>(IEnumerable<T>, Predicate<T>)	Determines whether an element within a collection of elements exists within a function.

Exists(Int32, Int32, Predicate<Int32>)

Source:

Contracts.cs

Determines whether a specified test is true for any integer within a range of integers.

public:
 static bool Exists(int fromInclusive, int toExclusive, Predicate<int> ^ predicate);

public static bool Exists (int fromInclusive, int toExclusive, Predicate<int> predicate);

static member Exists : int * int * Predicate<int> -> bool

Public Shared Function Exists (fromInclusive As Integer, toExclusive As Integer, predicate As Predicate(Of Integer)) As Boolean

Parameters

fromInclusive

Int32

The first integer to pass to predicate.

toExclusive

Int32

One more than the last integer to pass to predicate.

predicate

Predicate<Int32>

The function to evaluate for any value of the integer in the specified range.

Returns

Boolean

true if predicate returns true for any integer starting from fromInclusive to toExclusive - 1.

Exceptions

ArgumentNullException

predicate is null.

ArgumentException

toExclusive is less than fromInclusive.

Remarks

The toExclusive parameter is one more than the last integer to facilitate using the length of a range of integers starting at 0. For example, it would be set to 5 for integers 0 through 4.

See also

• Exists(Predicate<T>)

Exists<T>(IEnumerable<T>, Predicate<T>)

Source:

Contracts.cs

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

public:
generic <typename T>
 static bool Exists(System::Collections::Generic::IEnumerable<T> ^ collection, Predicate<T> ^ predicate);

public static bool Exists<T> (System.Collections.Generic.IEnumerable<T> collection, Predicate<T> predicate);

static member Exists : seq<'T> * Predicate<'T> -> bool

Public Shared Function Exists(Of T) (collection As IEnumerable(Of T), predicate As Predicate(Of T)) As Boolean

Type Parameters

T

The type that is contained in collection.

Parameters

collection

IEnumerable<T>

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

predicate

Predicate<T>

The function to evaluate for an element in collection.

Returns

Boolean

true if and only if predicate returns true for any element of type T in collection.

Exceptions

ArgumentNullException

collection or predicate is null.

See also

• Exists(Predicate<T>)