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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

Concat (simple - numbers)

Lambda Query

Concat: Concatenates (combines) two collections.

Concat: Concatenates (combines) two collections.

This Lambda Expression sample concatenates two arrays of numbers.

This Lambda Expression sample concatenates two arrays of numbers.

  • C#
  • VB.Net
  • F#
// A Query Expression cannot be constructed for Concat() in C#.
// Consider using a Lambda Expression instead.
' A Query Expression cannot be constructed for Concat() in VB.NET.
' Consider using a Lambda Expression instead.
// A Query Expression cannot be constructed for Concat() in F#.
// Consider using a Lambda Expression instead.
  • C#
  • VB.Net
  • F#
static void Sample_Concat_Lambda_Numbers()
{
    int[] numbers1 = { 1, 2, 3 };
    int[] numbers2 = { 4, 5, 6 };

    var result = numbers1.Concat(numbers2);

    Debug.WriteLine("Concatenating numbers1 and numbers2 gives:");
    foreach (int number in result)
        Debug.WriteLine(number);
}
Output:
Concatenating numbers1 and numbers2 gives:
1
2
3
4
5
6
Private Shared Sub Sample_Concat_Lambda_Numbers()
    Dim numbers1 As Integer() = {1, 2, 3}
    Dim numbers2 As Integer() = {4, 5, 6}

    Dim result = numbers1.Concat(numbers2)

    Debug.WriteLine("Concatenating numbers1 and numbers2 gives:")
    For Each number As Integer In result
        Debug.WriteLine(number)
    Next
End Sub
Output:
Concatenating numbers1 and numbers2 gives:
1
2
3
4
5
6
let Sample_Concat_Lambda_Numbers() =
    let numbers1 = [|1; 2; 3|]
    let numbers2 = [|4; 5; 6|]

    let result = numbers1.Concat(numbers2)

    Debug.WriteLine(sprintf "Concatenating numbers1 and numbers2 gives:")
    for number in result do
        Debug.WriteLine(sprintf "%d" number)
Output:
Concatenating numbers1 and numbers2 gives:
1
2
3
4
5
6

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