{"id":2437,"date":"2023-06-26T11:14:17","date_gmt":"2023-06-26T04:14:17","guid":{"rendered":"https:\/\/csharptutorial.net\/?page_id=2437"},"modified":"2023-06-26T11:15:17","modified_gmt":"2023-06-26T04:15:17","slug":"linq-reverse","status":"publish","type":"page","link":"https:\/\/www.csharptutorial.net\/csharp-linq\/linq-reverse\/","title":{"rendered":"LINQ Reverse"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to reverse a sequence using the LINQ <code>Reverse()<\/code> method.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to the LINQ Reverse() method<\/h2>\n\n\n\n<p>The <code>Reverse()<\/code> method allows you to inver the order of elements in a sequence. Here&#8217;s the syntax of the <code>Reverse()<\/code> method:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\">IEnumerable&lt;TSource&gt; Reverse&lt;TSource&gt; (\n    <span class=\"hljs-keyword\">this<\/span> IEnumerable&lt;TSource&gt; source\n);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this syntax:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>TSource<\/code> is the type of element of the <code>source<\/code> sequence.<\/li>\n\n\n\n<li><code>source<\/code> is an <code><a href=\"https:\/\/csharptutorial.net\/csharp-linq\/csharp-ienumerable\/\">IEnumerable&lt;TSource><\/a><\/code> that represents the input sequence.<\/li>\n<\/ul>\n\n\n\n<p>The <code>Reverse()<\/code> method returns a new sequence that mirrors the <code>source<\/code> sequence by arranging its elements in reverse order.<\/p>\n\n\n\n<p>The <code>Reverse()<\/code> method throws an <code>ArgumentNullException<\/code> if the <code>source<\/code> sequence is null.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">LINQ Reverse() method example<\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>Reverse()<\/code> method<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1) Using LINQ Reverse() method to reverse a list of integers<\/h3>\n\n\n\n<p>The following example shows how to use the <code>Reverse()<\/code> method to reverse a list of integers:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">using<\/span> <span class=\"hljs-keyword\">static<\/span> System.Console;\n\n<span class=\"hljs-keyword\">var<\/span> numbers = <span class=\"hljs-keyword\">new<\/span> List&lt;<span class=\"hljs-keyword\">int<\/span>&gt;() { <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span> };\n\n<span class=\"hljs-keyword\">var<\/span> reversedNums = Enumerable.Reverse(numbers);\n\n<span class=\"hljs-keyword\">foreach<\/span> (<span class=\"hljs-keyword\">var<\/span> number <span class=\"hljs-keyword\">in<\/span> reversedNums)\n{\n    WriteLine(number);\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">3\n2\n1<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">2) Using LINQ Reverse() method to reverse a list of strings<\/h3>\n\n\n\n<p>The following example illustrates how to use the <code>Reverse()<\/code> method to reverse a list of strings:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">using<\/span> <span class=\"hljs-keyword\">static<\/span> System.Console;\n\n<span class=\"hljs-keyword\">var<\/span> words = <span class=\"hljs-keyword\">new<\/span> List&lt;<span class=\"hljs-keyword\">string<\/span>&gt;() { <span class=\"hljs-string\">\"Hello\"<\/span>,<span class=\"hljs-string\">\"World\"<\/span> };\n<span class=\"hljs-keyword\">var<\/span> reversedWords = Enumerable.Reverse(words);\n\n<span class=\"hljs-keyword\">foreach<\/span> (<span class=\"hljs-keyword\">var<\/span> word <span class=\"hljs-keyword\">in<\/span> reversedWords)\n{\n    WriteLine(word);\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">C#<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">cs<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">World\nHello<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use LINQ <code>Reverse()<\/code> method to return a new sequence that contains elements of an input sequence but in a reversed order.<\/li>\n<\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful 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