IEnumerable<T>.FirstOrDefault Method

Unit:: Spring.Collections

Package:: Spring.Base

Overloads

FirstOrDefault	Returns the first element of the sequence, or a default value if the sequence contains no elements.
FirstOrDefault(T)	Returns the first element of the sequence, or the specified default value if the sequence contains no elements.
FirstOrDefault(Predicate<T>)	Returns the first element of the sequence that satisfies the specified condition or a default value if no such element is found.
FirstOrDefault(Predicate<T>, T)	Returns the first element of the sequence that satisfies the specified condition or the specified default value if no such element is found.

FirstOrDefault

Returns the first element of the sequence, or a default value if the sequence contains no elements.

Delphi

function FirstOrDefault: T

Returns

Default(T) if source is empty; otherwise, the first element in the sequence.

FirstOrDefault(T)

Returns the first element of the sequence, or the specified default value if the sequence contains no elements.

Delphi

function FirstOrDefault(const defaultValue: T): T

Parameters

defaultValue: T

The default value to return if the sequence is empty.

Returns

defaultValue if the sequence is empty; otherwise, the first element in the sequence.

FirstOrDefault(Predicate<T>)

Returns the first element of the sequence that satisfies the specified condition or a default value if no such element is found.

Delphi

function FirstOrDefault(const predicate: Predicate<T>): T

Parameters

predicate: Predicate<T>

A function to test each element for a condition.

Returns

Default(T) if source is empty or if no element passes the test specified by predicate ; otherwise, the first element in the sequence that passes the test specified by predicate .

Exceptions

predicate is nil .

FirstOrDefault(Predicate<T>, T)

Returns the first element of the sequence that satisfies the specified condition or the specified default value if no such element is found.

Delphi

function FirstOrDefault(const predicate: Predicate<T>; const defaultValue: T): T

Parameters

predicate: Predicate<T>

A function to test each element for a condition.

defaultValue: T

The default value to return if the sequence is empty or no element passes the condition.

Returns

defaultValue if the sequence is empty or if no element passes the test specified by predicate ; otherwise, the first element in the sequence that passes the test specified by predicate .

Exceptions

predicate is nil .