ToArray(TSource) Method

Enumerable.ToArray(Of TSource) Method (IEnumerable(Of TSource))


Creates an array from a IEnumerable(Of T).

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

Public Shared Function ToArray(Of TSource) (
	source As IEnumerable(Of TSource)
) As TSource()


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

An IEnumerable(Of T) to create an array from.

Return Value

Type: TSource()

An array that contains the elements from the input sequence.

Type Parameters


The type of the elements of source.

Exception Condition

source is null.

The ToArray(Of TSource)(IEnumerable(Of TSource)) method forces immediate query evaluation and returns an array that contains the query results. You can append this method to your query in order to obtain a cached copy of the query results.

ToList(Of TSource) has similar behavior but returns a List(Of T) instead of an array.

The following code example demonstrates how to use ToArray(Of TSource) to force immediate query evaluation and return an array of results.

Structure Package
    Public Company As String
    Public Weight As Double
End Structure

Sub ToArrayEx1()
    ' Create a list of Package values.
    Dim packages As New List(Of Package)(New Package() _
         {New Package With {.Company = "Coho Vineyard", .Weight = 25.2}, _
          New Package With {.Company = "Lucerne Publishing", .Weight = 18.7}, _
          New Package With {.Company = "Wingtip Toys", .Weight = 6.0}, _
          New Package With {.Company = "Adventure Works", .Weight = 33.8}})

    ' Project the Company values from each item in the list
    ' and put them into an array.
    Dim companies() As String = _
        packages _
        .Select(Function(pkg) pkg.Company) _

    ' Display the results.
    Dim output As New System.Text.StringBuilder
    For Each company As String In companies
End Sub

' This code produces the following output:
' Coho Vineyard
' Lucerne Publishing
' Wingtip Toys
' Adventure Works

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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