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EnumerableToList Method
 

Creates a List from an IEnumerable.

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

Syntax
public static List<TSource> ToList<TSource>(
	this IEnumerable<TSource> source
)
public:
generic<typename TSource>
[ExtensionAttribute]
static List<TSource>^ ToList(
	IEnumerable<TSource>^ source
)
static member ToList<'TSource> : 
        source:IEnumerable<'TSource> -> List<'TSource>
<ExtensionAttribute>
Public Shared Function ToList(Of TSource) (
	source As IEnumerable(Of TSource)
) As List(Of TSource)

Parameters

source
Type:

The IEnumerable to create a List from.

Return Value

Type:

A List that contains elements from the input sequence.

Type Parameters

TSource

The type of the elements of source.

Exceptions
Exception Condition
ArgumentNullException

source is null.

Remarks

The ToList method forces immediate query evaluation and returns a List that contains the query results. You can append this method to your query in order to obtain a cached copy of the query results.

ToArray has similar behavior but returns an array instead of a List.

Examples

The following code example demonstrates how to use ToList to force immediate query evaluation and return a List that contains the query results.

string[] fruits = { "apple", "passionfruit", "banana", "mango", 
                      "orange", "blueberry", "grape", "strawberry" };

List<int> lengths = fruits.Select(fruit => fruit.Length).ToList();

foreach (int length in lengths)
{
    Console.WriteLine(length);
}

/*
 This code produces the following output:

 5
 12
 6
 5
 6
 9
 5
 10
*/
' Create an array of strings.
Dim fruits() As String = _
    {"apple", "passionfruit", "banana", "mango", _
     "orange", "blueberry", "grape", "strawberry"}

' Project the length of each string and 
' put the length values into a List object.
Dim lengths As List(Of Integer) = _
    fruits _
    .Select(Function(fruit) fruit.Length) _
    .ToList()

' Display the results.
Dim output As New System.Text.StringBuilder
For Each length As Integer In lengths
    output.AppendLine(length)
Next
MsgBox(output.ToString())

' This code produces the following output:
'
' 5
' 12
' 6
' 5
' 6
' 9
' 5
' 10
Version Information
Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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