MoreLinq
MoreLinq
MoreEnumerable Class
MoreEnumerable Methods
Acquire(TSource) Method
Aggregate Method
AggregateRight Method
Append(T) Method
Assert Method
AssertCount Method
AtLeast(T) Method
AtMost(T) Method
Backsert(T) Method
Batch Method
Cartesian Method
Choose(T, TResult) Method
CompareCount(TFirst, TSecond) Method
Concat(T) Method
Consume(T) Method
CountBetween(T) Method
CountBy Method
CountDown(T, TResult) Method
DistinctBy Method
EndsWith Method
EquiZip Method
Evaluate(T) Method
Exactly(T) Method
ExceptBy Method
Exclude(T) Method
FallbackIfEmpty Method
FillBackward Method
FillForward Method
First(T) Method
FirstOrDefault(T) Method
Flatten Method
Fold Method
ForEach Method
From Method
FullGroupJoin Method
FullJoin Method
Generate(TResult) Method
GenerateByIndex(TResult) Method
GroupAdjacent Method
Index Method
IndexBy Method
Insert(T) Method
Interleave(T) Method
Lag Method
Last(T) Method
LastOrDefault(T) Method
Lead Method
LeftJoin Method
MaxBy Method
MinBy Method
Move(T) Method
OrderBy Method
OrderedMerge Method
Pad Method
PadStart Method
Pairwise(TSource, TResult) Method
PartialSort Method
PartialSortBy Method
Partition Method
Permutations(T) Method
Pipe(T) Method
Prepend(TSource) Method
PreScan(TSource) Method
Random Method
RandomDouble Method
RandomSubset Method
Rank Method
RankBy Method
Repeat Method
Return(T) Method
RightJoin Method
RunLengthEncode Method
Scan Method
ScanBy Method
ScanRight Method
Segment Method
Sequence Method
Shuffle Method
Single(T) Method
SingleOrDefault(T) Method
SkipLast(T) Method
SkipUntil(TSource) Method
Slice(T) Method
SortedMerge Method
Split Method
StartsWith Method
Subsets Method
TagFirstLast(TSource, TResult) Method
TakeEvery(TSource) Method
TakeLast(TSource) Method
TakeUntil(TSource) Method
ThenBy Method
ToArrayByIndex Method
ToDataTable Method
ToDelimitedString Method
ToDictionary Method
ToHashSet Method
ToLookup Method
Trace Method
Transpose(T) Method
TraverseBreadthFirst(T) Method
TraverseDepthFirst(T) Method
Unfold(TState, T, TResult) Method
Window(TSource) Method
Windowed(TSource) Method
WindowLeft(TSource) Method
WindowRight(TSource) Method
ZipLongest Method
ZipShortest Method
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MoreEnumerableFirstOrDefaultT Method

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

Namespace:  MoreLinq
Assembly:  MoreLinq (in MoreLinq.dll) Version: 3.3.1+b77df70598ab84c28cd43dcf74594024b6d575e1
Syntax
Copy
public static T FirstOrDefault<T>(
	this IExtremaEnumerable<T> source
)

Parameters

source
Type: MoreLinqIExtremaEnumerableT
The input sequence.

Type Parameters

T
The type of the elements of source.

Return Value

Type: T
Default value of type T if source is empty; otherwise, the first element in source.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IExtremaEnumerableT. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
See Also