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LINQ to Objects

Aggregation

Aggregate, Average, Count, LongCount, Max, Min, Sum

      Aggregate (simple)       Aggregate (seed)       Average       Count       LongCount       Max       Min       Sum

Conversion

AsEnumerable, Cast, OfType, ToArray, ToDictionary, ToList, ToLookup

      AsEnumerable       Cast       OfType       ToArray       ToDictionary (simple)       ToDictionary (conditional)       ToList       ToLookup

Element

ElementAt, ElementAtOrDefault, First, FirstOrDefault, Last, LastOrDefault, Single, SingleOrDefault

      ElementAt       ElementAtOrDefault       First (simple)       First (conditional)       FirstOrDefault       Last       LastOrDefault (simple)       LastOrDefault (conditional)       Single       SingleOrDefault

Generation

DefaultIfEmpty, Empty, Range, Repeat

      DefaultIfEmpty (simple)       DefaultIfEmpty (default value)       Empty       Range       Repeat

Grouping

GroupBy

      GroupBy

Join

GroupJoin, Join

      GroupJoin (left outer join)       Join (inner join)

Ordering

OrderBy, OrderByDescending, Reverse, ThenBy, ThenByDescending

      OrderBy (simple - numbers)       OrderBy (simple - dates)       OrderBy (simple - objects)       OrderByDescending       Reverse       ThenBy       ThenByDescending

Other

Concat, SequenceEqual, Zip

      Concat (simple - numbers)       Concat (simple - strings)       SequenceEqual       Zip

Partitioning

Skip, SkipWhile, Take, TakeWhile

      Skip       SkipWhile       Take       TakeWhile

Projection

Select, SelectMany

      Select (simple)       Select (anonymous type)       Select (indexed)       SelectMany (cross join)

Quantifiers

All, Any, Contains

      All       Any       Contains

Restriction

Where

      Where (simple - numbers)       Where (simple - objects)       Where (indexed)

Set

Distinct, Except, Intersect, Union

      Distinct       Except       Intersect       Union
  Close

Empty

Lambda Query

Empty: Generates an empty collection (with no elements).

Empty: Generates an empty collection (with no elements).

This Lambda Expression sample creates an empty sequence of type string.

This Lambda Expression sample creates an empty sequence of type string.

  • C#
  • VB.Net
  • F#
// A Query Expression cannot be constructed for Empty() with index in C#.
// Consider using a Lambda Expression instead.
' A Query Expression cannot be constructed for Empty() with index in VB.NET.
' Consider using a Lambda Expression instead.
// A Query Expression cannot be constructed for Empty() with index in F#.
// Consider using a Lambda Expression instead.
  • C#
  • VB.Net
  • F#
static void Sample_Empty_Lambda()
{
    var empty = Enumerable.Empty<string>();
    // To make sequence into an array use empty.ToArray()

    Debug.WriteLine("Sequence is empty:");
    Debug.WriteLine(empty.Count() == 0);
}
Output:
Sequence is empty:
True
Private Shared Sub Sample_Empty_Lambda()
    Dim empty = Enumerable.Empty(Of String)()
    ' To make sequence into an array use empty.ToArray()

    Debug.WriteLine("Sequence is empty:")
    Debug.WriteLine(empty.Count() = 0)
End Sub
Output:
Sequence is empty:
True
let Sample_Empty_Lambda() =
    let empty = Enumerable.Empty<string>()
    // To make sequence into an array use empty.ToArray()

    Debug.WriteLine(sprintf "Sequence is empty:")
    Debug.WriteLine(sprintf "%b" (empty.Count() = 0))
Output:
Sequence is empty:
true

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