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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

Reverse

Lambda Query

Reverse: Reverses elements in a collection.

Reverse: Reverses elements in a collection.

This Lambda Expression sample reverts characters in array.

This Lambda Expression sample reverts characters in array.

  • C#
  • VB.Net
  • F#
static void Sample_Reverse_Linq()
{
    char[] characters = { 's', 'a', 'm', 'p', 'l', 'e' };

    var result = (from c in characters.Reverse()
                  select c);

    Debug.WriteLine("Characters in reverse order:");
    foreach (char character in result)
        Debug.WriteLine(character);
}
Output:
Characters in reverse order:
e
l
p
m
a
s
Private Shared Sub Sample_Reverse_Linq()
    Dim characters As Char() = {"s"c, "a"c, "m"c, "p"c, "l"c, "e"c}

    Dim result = From c In characters.Reverse Select c

    Debug.WriteLine("Characters in reverse order:")
    For Each character As Char In result
        Debug.WriteLine(character)
    Next
End Sub
Output:
Characters in reverse order:
e
l
p
m
a
s
let Sample_Reverse_Linq() =
    let characters = [|'s'; 'a'; 'm'; 'p'; 'l'; 'e'|]

    let result = query {
        for c in characters.Reverse() do
        select c
    }

    Debug.WriteLine(sprintf "Characters in reverse order:")
    for character in result do
        Debug.WriteLine(sprintf "%c" character)
Output:
Characters in reverse order:
e
l
p
m
a
s
  • C#
  • VB.Net
  • F#
static void Sample_Reverse_Lambda()
{
    char[] characters = { 's', 'a', 'm', 'p', 'l', 'e' };

    var result = characters.Reverse();

    Debug.WriteLine("Characters in reverse order:");
    foreach (char character in result)
        Debug.WriteLine(character);
}
Output:
Characters in reverse order:
e
l
p
m
a
s
Private Shared Sub Sample_Reverse_Lambda()
    Dim characters As Char() = {"s"c, "a"c, "m"c, "p"c, "l"c, "e"c}

    Dim result = characters.Reverse()

    Debug.WriteLine("Characters in reverse order:")
    For Each character As Char In result
        Debug.WriteLine(character)
    Next
End Sub
Output:
Characters in reverse order:
e
l
p
m
a
s
let Sample_Reverse_Lambda() =
    let characters = [|'s'; 'a'; 'm'; 'p'; 'l'; 'e'|]

    let result = characters.Reverse();

    Debug.WriteLine(sprintf "Characters in reverse order:")
    for character in result do
        Debug.WriteLine(sprintf "%c" character)
Output:
Characters in reverse order:
e
l
p
m
a
s

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