List<T>.ConvertAll<TOutput>(Converter<T,TOutput>) Method (System.Collections.Generic)

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button-sm is-hidden-tablet has-inner-focus" data-bi-name="contents-expand" data-contents-button hidden> <span class="icon"> <span class="docon docon-editor-list-bullet" aria-hidden="true"></span> </span><span class="contents-expand-title">Table of contents</span></button> </div> <div class="content "> <a id="system-collections-generic-list-1-convertall-1(system-converter((-0-0)))"></a> <h1>List<T>.Convert<wbr>All<TOutput>(Converter<T,TOutput>) Method</h1> <div class="display-flex-tablet justify-content-space-between-tablet"> <ul class="metadata page-metadata align-items-center" data-bi-name="page info"> <li>Reference</li> </ul> <div id="user-feedback" class="margin-block-xxs display-none-print" data-hide-on-archived=""> <button id="user-feedback-button" data-test-id="conceptual-feedback-button" class="button button-sm button-clear button-primary" type="button" data-bi-name="user-feedback-button" data-user-feedback-button=""> <span class="icon" aria-hidden="true"> <span class="docon docon-like"></span> </span> <span>Feedback</span> </button> </div> </div> <nav id="center-doc-outline" class="doc-outline is-hidden-desktop display-none-print margin-bottom-sm" data-bi-name="intopic toc" aria-label=""> <h2 class="title is-6 margin-block-xs"></h2> </nav> <h2 id="definition">Definition</h2> <div class="metadata"> <dl class="attributeList"> <dt>Namespace:</dt> <dd> <span class="break-text"> <a class="xref" href="system.collections.generic?view=net-9.0" data-linktype="relative-path">System.Collections.Generic</a> </span> </dd> </dl> <dl class="attributeList" data-moniker=" net-5.0 net-6.0 net-7.0 net-8.0 net-9.0 "> <dt>Assemblies:</dt><dd>netstandard.dll, System.Collections.dll</dd> </dl> <dl class="attributeList" data-moniker=" netcore-2.0 netcore-2.1 netcore-2.2 netcore-3.0 netcore-3.1 "> <dt>Assembly:</dt><dd>System.Collections.dll</dd> </dl> <dl class="attributeList" data-moniker=" netframework-2.0 netframework-3.0 netframework-3.5 netframework-4.0 netframework-4.5 netframework-4.5.1 netframework-4.5.2 netframework-4.6 netframework-4.6.1 netframework-4.6.2 netframework-4.7 netframework-4.7.1 netframework-4.7.2 netframework-4.8 netframework-4.8.1 "> <dt>Assembly:</dt><dd>mscorlib.dll</dd> </dl> <dl class="attributeList" data-moniker=" netstandard-2.0 netstandard-2.1 "> <dt>Assembly:</dt><dd>netstandard.dll</dd> </dl> <dl class="attributeList" data-moniker=" net-7.0 "> <dt>Source:</dt><dd><a href="https://github.com/dotnet/runtime/blob/d099f075e45d2aa6007a22b71b45a08758559f80/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/List.cs#L335C13-L346C25" data-linktype="external">List.cs</a></dd> </dl> <dl class="attributeList" data-moniker=" net-8.0 "> <dt>Source:</dt><dd><a href="https://github.com/dotnet/runtime/blob/5535e31a712343a63f5d7d796cd874e563e5ac14/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/List.cs#L366C13-L377C25" data-linktype="external">List.cs</a></dd> </dl> <dl class="attributeList" data-moniker=" net-9.0 "> <dt>Source:</dt><dd><a href="https://github.com/dotnet/runtime/blob/1d1bf92fcf43aa6981804dc53c5174445069c9e4/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/List.cs#L366C13-L377C25" data-linktype="external">List.cs</a></dd> </dl> </div><div class="alert is-primary is-hidden moniker-display-boilerplate"> <p class="alert-title"> <span class="docon docon-status-info-outline" aria-hidden="true"></span> Important </p> <p>Some information relates to prerelease product that may be substantially modified before it鈥檚 released. Microsoft makes no warranties, express or implied, with respect to the information provided here.</p> </div> <div data-moniker=" net-5.0 net-6.0 net-7.0 net-8.0 net-9.0 netcore-2.0 netcore-2.1 netcore-2.2 netcore-3.0 netcore-3.1 netframework-2.0 netframework-3.0 netframework-3.5 netframework-4.0 netframework-4.5 netframework-4.5.1 netframework-4.5.2 netframework-4.6 netframework-4.6.1 netframework-4.6.2 netframework-4.7 netframework-4.7.1 netframework-4.7.2 netframework-4.8 netframework-4.8.1 netstandard-2.0 netstandard-2.1 "> <div class="summaryHolder"> <div class="summary clearFix has-text-wrap"> <p>Converts the elements in the current <a class="no-loc" href="system.collections.generic.list-1?view=net-9.0" data-linktype="relative-path">List<T></a> to another type, and returns a list containing the converted elements.</p> </div> </div> <pre class="wrap" data-moniker=" net-5.0 net-6.0 net-7.0 net-8.0 net-9.0 netcore-2.0 netcore-2.1 netcore-2.2 netcore-3.0 netcore-3.1 netframework-2.0 netframework-3.0 netframework-3.5 netframework-4.0 netframework-4.5 netframework-4.5.1 netframework-4.5.2 netframework-4.6 netframework-4.6.1 netframework-4.6.2 netframework-4.7 netframework-4.7.1 netframework-4.7.2 netframework-4.8 netframework-4.8.1 netstandard-2.0 netstandard-2.1 "><code class="cpp lang-cpp" dir="ltr">public: generic <typename TOutput> System::Collections::Generic::List<TOutput> ^ ConvertAll(Converter<T, TOutput> ^ converter);</code></pre> <pre class="wrap" data-moniker=" net-5.0 net-6.0 net-7.0 net-8.0 net-9.0 netcore-2.0 netcore-2.1 netcore-2.2 netcore-3.0 netcore-3.1 netframework-2.0 netframework-3.0 netframework-3.5 netframework-4.0 netframework-4.5 netframework-4.5.1 netframework-4.5.2 netframework-4.6 netframework-4.6.1 netframework-4.6.2 netframework-4.7 netframework-4.7.1 netframework-4.7.2 netframework-4.8 netframework-4.8.1 netstandard-2.0 netstandard-2.1 "><code class="csharp lang-csharp" dir="ltr">public System.Collections.Generic.List<TOutput> ConvertAll<TOutput>(Converter<T,TOutput> converter);</code></pre> <pre class="wrap" data-moniker=" net-5.0 net-6.0 net-7.0 net-8.0 net-9.0 netcore-2.0 netcore-2.1 netcore-2.2 netcore-3.0 netcore-3.1 netframework-2.0 netframework-3.0 netframework-3.5 netframework-4.0 netframework-4.5 netframework-4.5.1 netframework-4.5.2 netframework-4.6 netframework-4.6.1 netframework-4.6.2 netframework-4.7 netframework-4.7.1 netframework-4.7.2 netframework-4.8 netframework-4.8.1 netstandard-2.0 netstandard-2.1 "><code class="fsharp lang-fsharp" dir="ltr">member this.ConvertAll : Converter<'T, 'Output> -> System.Collections.Generic.List<'Output></code></pre> <pre class="wrap" data-moniker=" net-5.0 net-6.0 net-7.0 net-8.0 net-9.0 netcore-2.0 netcore-2.1 netcore-2.2 netcore-3.0 netcore-3.1 netframework-2.0 netframework-3.0 netframework-3.5 netframework-4.0 netframework-4.5 netframework-4.5.1 netframework-4.5.2 netframework-4.6 netframework-4.6.1 netframework-4.6.2 netframework-4.7 netframework-4.7.1 netframework-4.7.2 netframework-4.8 netframework-4.8.1 netstandard-2.0 netstandard-2.1 "><code class="vb lang-vb" dir="ltr">Public Function ConvertAll(Of TOutput) (converter As Converter(Of T, TOutput)) As List(Of TOutput)</code></pre> <h4 class="propertyInfoTitle stack">Type Parameters</h4> <div class="propertyInfo"> <dl class="parameterList"> <dt> TOutput </dt> <dd> </dd> </dl> <p>The type of the elements of the target array.</p> </div> <h4 class="propertyInfoTitle stack">Parameters</h4> <div class="propertyInfo"> <dl class="parameterList"> <dt> <span data-moniker=" net-5.0 net-6.0 net-7.0 net-8.0 net-9.0 netcore-2.0 netcore-2.1 netcore-2.2 netcore-3.0 netcore-3.1 netframework-2.0 netframework-3.0 netframework-3.5 netframework-4.0 netframework-4.5 netframework-4.5.1 netframework-4.5.2 netframework-4.6 netframework-4.6.1 netframework-4.6.2 netframework-4.7 netframework-4.7.1 netframework-4.7.2 netframework-4.8 netframework-4.8.1 netstandard-2.0 netstandard-2.1 ">converter</span> </dt> <dd> <a href="system.converter-2?view=net-9.0" data-linktype="relative-path">Converter</a><T,TOutput> </dd> </dl> <p>A <a class="no-loc" href="system.converter-2?view=net-9.0" data-linktype="relative-path">Converter<TInput,TOutput></a> delegate that converts each element from one type to another type.</p> </div> <h4 class="propertyInfoTitle stack">Returns</h4> <div class="propertyInfo"> <a href="system.collections.generic.list-1?view=net-9.0" data-linktype="relative-path">List</a><TOutput> </div> <p>A <a class="no-loc" href="system.collections.generic.list-1?view=net-9.0" data-linktype="relative-path">List<T></a> of the target type containing the converted elements from the current <a class="no-loc" href="system.collections.generic.list-1?view=net-9.0" data-linktype="relative-path">List<T></a>.</p> <h4 class="propertyInfoTitle stack">Exceptions</h4> <div class="propertyInfo"> <div class="subtle"> <a href="system.argumentnullexception?view=net-9.0" data-linktype="relative-path">ArgumentNullException</a> </div> <p><code data-dev-comment-type="paramref">converter</code> is <code data-dev-comment-type="langword">null</code>.</p> </div> <h2>Examples</h2> <p>The following example defines a method named <code>PointFToPoint</code> that converts a <a href="system.drawing.pointf?view=net-9.0" class="no-loc" data-linktype="relative-path">PointF</a> structure to a <a href="system.drawing.point?view=net-9.0" class="no-loc" data-linktype="relative-path">Point</a> structure. The example then creates a <a href="system.collections.generic.list-1?view=net-9.0" class="no-loc" data-linktype="relative-path">List<T></a> of <a href="system.drawing.pointf?view=net-9.0" class="no-loc" data-linktype="relative-path">PointF</a> structures, creates a <code>Converter\<PointF, Point></code> delegate (<code>Converter(Of PointF, Point)</code> in Visual Basic) to represent the <code>PointFToPoint</code> method, and passes the delegate to the <a href="system.collections.generic.list-1.convertall?view=net-9.0" class="no-loc" data-linktype="relative-path">ConvertAll</a> method. The <a href="system.collections.generic.list-1.convertall?view=net-9.0" class="no-loc" data-linktype="relative-path">ConvertAll</a> method passes each element of the input list to the <code>PointFToPoint</code> method and puts the converted elements into a new list of <a href="system.drawing.point?view=net-9.0" class="no-loc" data-linktype="relative-path">Point</a> structures. Both lists are displayed.</p> <pre><code class="lang-cpp">#using <System.Drawing.dll> using namespace System; using namespace System::Drawing; using namespace System::Collections::Generic; Point PointFToPoint(PointF pf) { return Point((int) pf.X, (int) pf.Y); }; void main() { List<PointF>^ lpf = gcnew List<PointF>(); lpf->Add(PointF(27.8F, 32.62F)); lpf->Add(PointF(99.3F, 147.273F)); lpf->Add(PointF(7.5F, 1412.2F)); Console::WriteLine(); for each(PointF p in lpf) { Console::WriteLine(p); } List<Point>^ lp = lpf->ConvertAll<Point>( gcnew Converter<PointF, Point>(PointFToPoint) ); Console::WriteLine(); for each(Point p in lp) { Console::WriteLine(p); } } /* This code example produces the following output: {X=27.8, Y=32.62} {X=99.3, Y=147.273} {X=7.5, Y=1412.2} {X=27,Y=32} {X=99,Y=147} {X=7,Y=1412} */ </code></pre> <pre><code class="lang-csharp" data-interactive="csharp" data-interactive-mode="try-dotnet">using System; using System.Drawing; using System.Collections.Generic; public class Example { public static void Main() { List<PointF> lpf = new List<PointF>(); lpf.Add(new PointF(27.8F, 32.62F)); lpf.Add(new PointF(99.3F, 147.273F)); lpf.Add(new PointF(7.5F, 1412.2F)); Console.WriteLine(); foreach( PointF p in lpf ) { Console.WriteLine(p); } List<Point> lp = lpf.ConvertAll( new Converter<PointF, Point>(PointFToPoint)); Console.WriteLine(); foreach( Point p in lp ) { Console.WriteLine(p); } } public static Point PointFToPoint(PointF pf) { return new Point(((int) pf.X), ((int) pf.Y)); } } /* This code example produces the following output: {X=27.8, Y=32.62} {X=99.3, Y=147.273} {X=7.5, Y=1412.2} {X=27,Y=32} {X=99,Y=147} {X=7,Y=1412} */ </code></pre> <pre><code class="lang-vb">Imports System.Drawing Imports System.Collections.Generic Public Class Example Public Shared Sub Main() Dim lpf As New List(Of PointF) lpf.Add(New PointF(27.8, 32.62)) lpf.Add(New PointF(99.3, 147.273)) lpf.Add(New PointF(7.5, 1412.2)) Console.WriteLine() For Each p As PointF In lpf Console.WriteLine(p) Next Dim lp As List(Of Point) = lpf.ConvertAll( _ New Converter(Of PointF, Point)(AddressOf PointFToPoint)) Console.WriteLine() For Each p As Point In lp Console.WriteLine(p) Next End Sub Public Shared Function PointFToPoint(ByVal pf As PointF) _ As Point Return New Point(CInt(pf.X), CInt(pf.Y)) End Function End Class ' This code example produces the following output: ' '{X=27.8, Y=32.62} '{X=99.3, Y=147.273} '{X=7.5, Y=1412.2} ' '{X=28,Y=33} '{X=99,Y=147} '{X=8,Y=1412} </code></pre> <h2>Remarks</h2> <p>The <a href="system.converter-2?view=net-9.0" class="no-loc" data-linktype="relative-path">Converter<TInput,TOutput></a> is a delegate to a method that converts an object to the target type. The elements of the current <a href="system.collections.generic.list-1?view=net-9.0" class="no-loc" data-linktype="relative-path">List<T></a> are individually passed to the <a href="system.converter-2?view=net-9.0" class="no-loc" data-linktype="relative-path">Converter<TInput,TOutput></a> delegate, and the converted elements are saved in the new <a href="system.collections.generic.list-1?view=net-9.0" class="no-loc" data-linktype="relative-path">List<T></a>.</p> <p>The current <a href="system.collections.generic.list-1?view=net-9.0" class="no-loc" data-linktype="relative-path">List<T></a> remains unchanged.</p> <p>This method is an O(<em>n</em>) operation, where <em>n</em> is <a href="system.collections.generic.list-1.count?view=net-9.0" class="no-loc" data-linktype="relative-path">Count</a>.</p> <h2>Applies to</h2> <div class="table-wrapper moniker-applies-to-table"> <table class="table table-complex has-row-header-background"> <thead> </thead> </table> </div> <h2>See also</h2> <ul> <li><a href="system.converter-2?view=net-9.0" class="no-loc" data-linktype="relative-path">Converter<TInput,TOutput></a></li> </ul> </div> </div><div id="ms--inline-notifications" class="margin-block-xs" data-bi-name="inline-notification"></div><div id="assertive-live-region" role="alert" aria-live="assertive" class="visually-hidden" aria-relevant="additions" aria-atomic="true"></div> <div id="polite-live-region" role="status" aria-live="polite" class="visually-hidden" aria-relevant="additions" aria-atomic="true"></div>  </main> <section class="feedback-section position-relative margin-top-lg border border-radius padding-xxs" data-bi-name="open-source-feedback-section" data-open-source-feedback-section hidden> <div class="display-flex flex-direction-column flex-direction-row-tablet"> <div class="width-450-tablet padding-inline-xs padding-inline-xs-tablet padding-top-xs padding-bottom-sm padding-top-xs-tablet background-color-body-medium"> <div class="display-flex flex-direction-column"> <div class="padding-bottom-xxs"> <span class="icon margin-right-xxs" aria-hidden="true"> <span class="docon docon-brand-github"></span> </span> <span class="font-weight-semibold" >Collaborate with us on GitHub</span> </div> <span class="line-height-normal"> The source for this content can be found on GitHub, where you can also create and review issues and pull requests. 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