SequenceEqual(TSource) Method (IQueryable(TSource), IEnumerable(TSource))
Collapse the table of content
Expand the table of content

Queryable.SequenceEqual(Of TSource) Method (IQueryable(Of TSource), IEnumerable(Of TSource))

 

Determines whether two sequences are equal by using the default equality comparer to compare elements.

Namespace:   System.Linq
Assembly:  System.Core (in System.Core.dll)

<ExtensionAttribute>
Public Shared Function SequenceEqual(Of TSource) (
	source1 As IQueryable(Of TSource),
	source2 As IEnumerable(Of TSource)
) As Boolean

Parameters

source1
Type: System.Linq.IQueryable(Of TSource)

An IQueryable(Of T) whose elements to compare to those of source2.

source2
Type: System.Collections.Generic.IEnumerable(Of TSource)

An IEnumerable(Of T) whose elements to compare to those of the first sequence.

Return Value

Type: System.Boolean

true if the two source sequences are of equal length and their corresponding elements compare equal; otherwise, false.

Type Parameters

TSource

The type of the elements of the input sequences.

Exception Condition
ArgumentNullException

source1 or source2 is null.

The SequenceEqual(Of TSource)(IQueryable(Of TSource), IEnumerable(Of TSource)) method generates a MethodCallExpression that represents calling SequenceEqual(Of TSource)(IQueryable(Of TSource), IEnumerable(Of TSource)) itself as a constructed generic method. It then passes the MethodCallExpression to the Execute(Of TResult)(Expression) method of the IQueryProvider represented by the Provider property of the source1 parameter.

The query behavior that occurs as a result of executing an expression tree that represents calling SequenceEqual(Of TSource)(IQueryable(Of TSource), IEnumerable(Of TSource)) depends on the implementation of the type of the source1 parameter. The expected behavior is that it determines if the two source sequences are equal.

The following code example demonstrates how to use SequenceEqual(Of TSource)(IQueryable(Of TSource), IEnumerable(Of TSource)) to determine whether two sequences are equal. In this example the sequences are equal.

Class Pet
    Public Name As String
    Public Age As Integer
End Class

Shared Sub SequenceEqualEx1()
    Dim pet1 As New Pet With {.Name = "Turbo", .Age = 2}
    Dim pet2 As New Pet With {.Name = "Peanut", .Age = 8}

    ' Create two lists of pets.
    Dim pets1 As New List(Of Pet)(New Pet() {pet1, pet2})
    Dim pets2 As New List(Of Pet)(New Pet() {pet1, pet2})

    ' Determine if the lists are equal.
    Dim equal As Boolean = pets1.AsQueryable().SequenceEqual(pets2)

    ' Display the output.
    Dim text As String = IIf(equal, "are", "are not")
    MsgBox("The lists " & text & " equal.")
End Sub

'This code produces the following output:

'The lists are equal.

The following code example compares two sequences that are not equal.

Class Pet
    Public Name As String
    Public Age As Integer
End Class

Shared Sub SequenceEqualEx2()
    Dim pet1 As New Pet With {.Name = "Turbo", .Age = 2}
    Dim pet2 As New Pet With {.Name = "Peanut", .Age = 8}

    ' Create two lists of pets.
    Dim pets1 As New List(Of Pet)()
    pets1.Add(pet1)
    pets1.Add(pet2)

    Dim pets2 As New List(Of Pet)()
    pets2.Add(New Pet With {.Name = "Turbo", .Age = 2})
    pets2.Add(New Pet With {.Name = "Peanut", .Age = 8})

    ' Determine if the lists are equal.
    Dim equal As Boolean = pets1.AsQueryable().SequenceEqual(pets2)

    ' Display the output.
    Dim text As String = IIf(equal, "are", "are not")
    MsgBox("The lists " & text & " equal.")
End Sub

' This code produces the following output:

' The lists are not equal.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.1
Windows Phone
Available since 8.1
Return to top
Show:
© 2016 Microsoft