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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

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Field

Extension method: T FirstOrDefault<T>(this IEnumerable<T>, T)

Declared in: RT.Util.ExtensionMethods.IEnumerableExtensions

Declaration

public static T FirstOrDefault<T>(
    this IEnumerable<T> source,
    T default
)

Summary

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

Generic type parameters

T	The type of the elements of source.

Parameters

this IEnumerable<T>	source	The IEnumerable<T> to return the first element of.
T	default	The default value to return if the sequence contains no elements.

Returns

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