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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

All

Lambda Query

All: Checks if all elements in a collection satisfies a specified condition.

All: Checks if all elements in a collection satisfies a specified condition.

This Lambda Expression sample checks whether all names in array start with letter "B".

This Lambda Expression sample checks whether all names in array start with letter "B".

  • C#
  • VB.Net
  • F#
// A Query Expression cannot be constructed for All() in C#.
// Consider using a Lambda Expression instead.
Private Shared Sub Sample_All_Linq()
    Dim names As String() = {"Bob", "Ned", "Amy", "Bill"}

    Dim result = Aggregate n In names Into All(n.StartsWith("B"))

    Debug.WriteLine("Does all of the names start with the letter 'B': ")
    Debug.WriteLine(result)
End Sub
Output:
Does all of the names start with the letter 'B': 
False
let Sample_All_Linq() =
    let names = [|"Bob"; "Ned"; "Amy"; "Bill"|]

    let result = query {
        for n in names do
        all (n.StartsWith "B")
    }

    Debug.WriteLine(sprintf "Does all of the names start with the letter 'B':")
    Debug.WriteLine(result);
Output:
Does all of the names start with the letter 'B':
False
  • C#
  • VB.Net
  • F#
static void Sample_All_Lambda()
{
    string[] names = { "Bob", "Ned", "Amy", "Bill" };

    var result = names.All(n => n.StartsWith("B"));

    Debug.WriteLine("Does all of the names start with the letter 'B':");
    Debug.WriteLine(result);
}
Output:
Does all of the names start with the letter 'B': 
False
Private Shared Sub Sample_All_Lambda()
    Dim names As String() = {"Bob", "Ned", "Amy", "Bill"}

    Dim result = names.All(Function(n) n.StartsWith("B"))

    Debug.WriteLine("Does all of the names start with the letter 'B': ")
    Debug.WriteLine(result)
End Sub
Output:
Does all of the names start with the letter 'B': 
False
let Sample_All_Lambda() =
    let names = [|"Bob"; "Ned"; "Amy"; "Bill"|]

    let result = names.All(fun n -> n.StartsWith "B")

    Debug.WriteLine(sprintf "Does all of the names start with the letter 'B':")
    Debug.WriteLine(result);
Output:
Does all of the names start with the letter 'B':
False

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