Enumerable.ToArray(Of TSource) Method

Creates an array from a IEnumerable(Of T).

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

'Declaration
<ExtensionAttribute> _
Public Shared Function ToArray(Of TSource) ( _
	source As IEnumerable(Of TSource) _
) As TSource()

Type Parameters

TSource

The type of the elements of source.

Parameters

source
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.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable(Of TSource). When you use instance method syntax to call this method, omit the first parameter.

ExceptionCondition
ArgumentNullException

source is Nothing.

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) _
          .ToArray()

      ' Display the results.
      Dim output As New System.Text.StringBuilder
      For Each company As String In companies
         output.AppendLine(company)
      Next
      outputBlock.Text &= output.ToString() & vbCrLf
   End Sub

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



Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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