All types|All members

RT.Util.Core
- RT.KitchenSink
- RT.KitchenSink.Collections
- RT.KitchenSink.Geometry
- RT.KitchenSink.Lex
- RT.KitchenSink.Streams
- RT.Util
- RT.Util.Collections
- RT.Util.Consoles
- RT.Util.ExtensionMethods
  - ArrayExtensions
  - CollectionExtensions
  - ConsecutiveGroup<TItem, TKey>
  - ConsoleExtensions
  - CustomComparerExtensions
  - DateTimeExtensions
  - DictionaryExtensions
  - IEnumerableExtensions
    - All<>(source, predicate)
    - AllPairs<>(source)
    - AllPairs<>(source, selector)
    - AllSequencesEqual<>(sources)
    - Any<>(source, predicate)
    - Concat<>(source, element)
    - Concat<>(head, tail)
    - ConsecutivePairs<>(source, closed)
    - FirstOrDefault<>(source, default)
    - FirstOrDefault<>(source, predicate, default)
    - FirstOrDefault<>(source, predicate, resultSelector, default)
    - FirstOrNull<>(source)
    - FirstOrNull<>(source, predicate)
    - GroupConsecutive<>(source, itemEquality)
    - GroupConsecutive<>(source, itemComparer)
    - GroupConsecutiveBy<>(source, selector, keyComparer)
    - IndexOf<>(source, predicate)
    - IndexOf<>(source, predicate)
    - IndexOf<>(source, predicate, startIndex)
    - IndexOf<>(source, element, comparer)
    - InsertBetween<>(source, extraElement)
    - InsertBetweenWithAnd<>(source, comma, and)
    - JoinString<>(values, separator, prefix, suffix, lastSeparator)
    - LastIndexOf<>(source, predicate)
    - MaxCountElement<>(source, comparer)
    - MaxCountElement<>(source, count, comparer)
    - MaxElement<>(source, valueSelector)
    - MaxElementOrDefault<>(source, valueSelector, defaultValue)
    - MaxElements<>(source, valueSelector)
    - MaxIndex<>(source, valueSelector)
    - MaxIndexOrNull<>(source, valueSelector)
    - MaxOrDefault<>(source, default)
    - MaxOrDefault<>(source, selector, default)
    - MaxOrNull<>(source)
    - MaxOrNull<>(source, selector)
    - MinElement<>(source, valueSelector)
    - MinElementOrDefault<>(source, valueSelector, defaultValue)
    - MinElements<>(source, valueSelector)
    - MinIndex<>(source, valueSelector)
    - MinIndexOrNull<>(source, valueSelector)
    - MinOrDefault<>(source, default)
    - MinOrDefault<>(source, selector, default)
    - MinOrNull<>(source)
    - MinOrNull<>(source, selector)
    - Order<>(source)
    - Order<>(source, comparer)
    - OrderLazy<>(source)
    - OrderLazy<>(source, comparer)
    - Permutations<>(source)
    - SelectChain<>(obj, next)
    - SelectConsecutivePairs<>(source, closed, selector)
    - SelectIndexWhere<>(source, predicate)
    - SelectNullable<>(source)
    - SelectTwo<>(source, selector1, selector2)
    - SequenceEqual<>(sequence1, sequence2)
    - SkipLast<>(source, count, throwIfNotEnough)
    - Split<>(splitWhat, splitWhere)
    - Split<>(source, chunkSize)
    - StartsWith<>(source, sequence)
    - StartsWith<>(source, sequence, comparer)
    - Subsequences<>(source, minLength, maxLength)
    - SumUnchecked(source)
    - SumUnchecked<>(source, selector)
    - ToDictionary<>(source, comparer, ignoreDuplicateKeys)
    - ToDictionary2<>(source, key1Selector, key2Selector, comparer1, comparer2)
    - ToDictionary2<>(source, key1Selector, key2Selector, elementSelector, comparer1, comparer2)
    - ToQueue<>(source)
    - ToStack<>(source)
    - UniquePairs<>(source)
    - WhereNotNull<>(src)
  - IQueryableExtensions
  - IsoDateFormat
  - IsoDatePrecision
  - JsQuotes
  - NumericExtensions
  - ProcessExtensions
  - RandomExtensions
  - ReadOnlyCollectionExtensions
  - ReflectionExtensions
  - RngExtensions
  - StreamExtensions
  - StringExtensions
  - TextReaderWriterExtensions
  - XmlLinqExtensions
- RT.Util.ExtensionMethods.Obsolete
- RT.Util.Geometry
- RT.Util.IL
- RT.Util.Paths
- RT.Util.Streams
- RT.Util.Text
- RT.Util.Threading
PropellerApi
PuzzleSolvers
RT.ArithmeticCoding
RT.BigInteger
RT.CommandLine
RT.Coordinates
RT.Dijkstra
RT.Generex
RT.Json
RT.Lingo
RT.Lingo.Base
RT.NUnitDirect
RT.PostBuild
RT.SelfService
RT.Serialization
RT.Serialization.Binary
RT.Serialization.Json
RT.Serialization.Xml
RT.Servers
RT.TagSoup
RT.Util
RT.Util.Legacy

Legend

Class

Struct

Enum

Interface

Delegate

Constructor

Method

Property

Event

Field

Extension method: T? FirstOrNull<T>(this IEnumerable<T>, Func<T, bool>)

Declared in: RT.Util.ExtensionMethods.IEnumerableExtensions

Declaration

public static T? FirstOrNull<T>(
    this IEnumerable<T> source,
    Func<T, bool> predicate
)

Summary

Returns the first element of a sequence that satisfies a given predicate, or null if the sequence contains no elements.

Generic type parameters

Must derive from: System.ValueType.
Must have a default constructor.
Must be a non-nullable value type.

The type of the elements of source.

Parameters

this IEnumerable<T>	source	The IEnumerable<T> to return the first element of.
Func<T, bool>	predicate	Only consider elements that satisfy this predicate.

Returns

null if source is empty; otherwise, the first element in source.