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Enumerable.ToList<TSource> Method

Creates a List<T> from an IEnumerable<T>.

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

public static List<TSource> ToList<TSource>(
	this IEnumerable<TSource> source

Type Parameters


The type of the elements of source.


Type: System.Collections.Generic.IEnumerable<TSource>

The IEnumerable<T> to create a List<T> from.

Return Value

Type: System.Collections.Generic.List<TSource>
A List<T> that contains 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<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).


source is null.

The ToList<TSource>(IEnumerable<TSource>) method forces immediate query evaluation and returns a List<T> 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<TSource> has similar behavior but returns an array instead of a List<T>.

The following code example demonstrates how to use ToList<TSource> to force immediate query evaluation and return a List<T> 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)

             This code produces the following output:


.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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