{"id":950,"date":"2023-03-14T13:47:33","date_gmt":"2023-03-14T06:47:33","guid":{"rendered":"https:\/\/csharptutorial.net\/?page_id=950"},"modified":"2023-03-19T09:16:44","modified_gmt":"2023-03-19T02:16:44","slug":"linq-orderby","status":"publish","type":"page","link":"https:\/\/www.csharptutorial.net\/csharp-linq\/linq-orderby\/","title":{"rendered":"LINQ OrderBy"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you&#8217;ll learn how to use LINQ <code>OrderBy()<\/code> method to sort the elements of a sequence in ascending order.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to the LINQ OrderBy method<\/h2>\n\n\n\n<p>The <code>OrderBy()<\/code> method sorts the elements of a sequence in ascending order:<\/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\">IOrderedEnumerable&lt;TSource&gt; OrderBy&lt;TSource, TKey&gt;(\n    <span class=\"hljs-keyword\">this<\/span> IEnumerable&lt;TSource&gt; source, \n    Func&lt;TSource, TKey&gt; keySelector\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 elements in the <code>source<\/code> sequence. <\/li>\n\n\n\n<li><code>TKey<\/code> is the type of key returned by <code>keySelector<\/code>.<\/li>\n\n\n\n<li>The <code>source<\/code> represents an input sequence to sort, which has the type of <code><a href=\"https:\/\/csharptutorial.net\/csharp-linq\/csharp-ienumerable\/\">IEnumrable&lt;TSource><\/a><\/code>.<\/li>\n\n\n\n<li>The <code>keySelector<\/code> is a function to extract a key from an element.<\/li>\n<\/ul>\n\n\n\n<p>The <code>OrderBy()<\/code> method returns an <code>IOrderedEnumerable&lt;TSource><\/code> that contains the sorted elements specified by a key.<\/p>\n\n\n\n<p>The <code>OrderBy()<\/code> method throws an <code>ArgumentNullException<\/code> if the <code>source<\/code> or <code>keySelector<\/code> is <code>null<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">LINQ OrderBy examples<\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the LINQ <code>OrderBy()<\/code> method.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1) Using the LINQ OrderBy() method to sort a sequence of numbers<\/h3>\n\n\n\n<p>The following program demonstrates how to use the <code>OrderBy()<\/code> method to sort a sequence of numbers:<\/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> scores = <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\">5<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">8<\/span>, <span class=\"hljs-number\">7<\/span> ,<span class=\"hljs-number\">9<\/span> };\n<span class=\"hljs-keyword\">var<\/span> sortedScores = scores.OrderBy(n =&gt; n);\n\n<span class=\"hljs-keyword\">foreach<\/span> (<span class=\"hljs-keyword\">var<\/span> score <span class=\"hljs-keyword\">in<\/span> sortedScores)\n{\n    Write(<span class=\"hljs-string\">$\"<span class=\"hljs-subst\">{score}<\/span> \"<\/span>);\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=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-number\">1<\/span> <span class=\"hljs-number\">2<\/span> <span class=\"hljs-number\">3<\/span> <span class=\"hljs-number\">5<\/span> <span class=\"hljs-number\">7<\/span> <span class=\"hljs-number\">8<\/span> <span class=\"hljs-number\">9<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><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>How it works.<\/p>\n\n\n\n<p>First, define a list of integers called <code>scores<\/code> and initialize it with a sequence of unordered integers:<\/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\">var<\/span> scores = <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\">5<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">8<\/span>, <span class=\"hljs-number\">7<\/span> ,<span class=\"hljs-number\">9<\/span> };<\/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>Second, sort the scores sequence using the <code><code>OrderBy()<\/code><\/code> method. The <code><code>OrderBy()<\/code><\/code> method returns a <code>sortedScores<\/code> with the <code><a href=\"https:\/\/csharptutorial.net\/csharp-linq\/csharp-ienumerable\/\">IEnumerable&lt;int><\/a><\/code> type, containing elements of the <code>scores<\/code> sequence but in ascending order:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">var<\/span> sortedScores = scores.OrderBy(n =&gt; n);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><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>The lambda expression <code>n =&gt; n<\/code> specifies the key used for sorting. In this case, it is the integer value itself.<\/p>\n\n\n\n<p>Third, write all elements of the <code>sortedScores<\/code> into the console using a <code><a href=\"https:\/\/csharptutorial.net\/csharp-tutorial\/csharp-foreach\/\">foreach<\/a><\/code> loop and <code>Write()<\/code> method:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">foreach<\/span> (<span class=\"hljs-keyword\">var<\/span> score <span class=\"hljs-keyword\">in<\/span> sortedScores)\n{\n    Write(<span class=\"hljs-string\">$\"<span class=\"hljs-subst\">{score}<\/span> \"<\/span>);\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><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<h3 class=\"wp-block-heading\">2) Using the LINQ OrderBy() method to sort a sequence of strings<\/h3>\n\n\n\n<p>The following program demonstrates how to use the <code>OrderBy()<\/code> method to sort a sequence of strings:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" 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> names = <span class=\"hljs-keyword\">new<\/span> List&lt;<span class=\"hljs-keyword\">string<\/span>&gt; { <span class=\"hljs-string\">\"Olivia\"<\/span>,<span class=\"hljs-string\">\"Ava\"<\/span>, <span class=\"hljs-string\">\"Ethan\"<\/span>, <span class=\"hljs-string\">\"Sophia\"<\/span>, <span class=\"hljs-string\">\"Lucas\"<\/span> };\n\n<span class=\"hljs-keyword\">var<\/span> sortedNames = names.OrderBy(name=&gt;name);\n\n<span class=\"hljs-keyword\">foreach<\/span> (<span class=\"hljs-keyword\">var<\/span> name <span class=\"hljs-keyword\">in<\/span> sortedNames)\n{\n    Write(<span class=\"hljs-string\">$\"<span class=\"hljs-subst\">{name}<\/span> \"<\/span>);\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><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-8\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\">Ava Ethan Lucas Olivia Sophia<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><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>How it works.<\/p>\n\n\n\n<p>First, create a <code>List&lt;string&gt;<\/code> that contains 5 names:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">var<\/span> names = <span class=\"hljs-keyword\">new<\/span> List&lt;<span class=\"hljs-keyword\">string<\/span>&gt; { <span class=\"hljs-string\">\"Olivia\"<\/span>,<span class=\"hljs-string\">\"Ava\"<\/span>, <span class=\"hljs-string\">\"Ethan\"<\/span>, <span class=\"hljs-string\">\"Sophia\"<\/span>, <span class=\"hljs-string\">\"Lucas\"<\/span> };<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><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>Second, sort the names list using the <code>OrderBy<\/code> clause. The lambda expression <code>name =&gt; name<\/code> specifies the key to order, which is the string value itself in this case:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">var<\/span> sortedNames = names.OrderBy(name=&gt;name);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><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>Third, write each name in the <code>sortedNames<\/code> list to the console:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">foreach<\/span> (<span class=\"hljs-keyword\">var<\/span> name <span class=\"hljs-keyword\">in<\/span> sortedNames)\n{\n    Write(<span class=\"hljs-string\">$\"<span class=\"hljs-subst\">{name}<\/span> \"<\/span>);\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><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<h3 class=\"wp-block-heading\">3) Using the LINQ OrderBy() method to sort a sequence of objects by its properties<\/h3>\n\n\n\n<p>The following program demonstrates how to use the <code>OrderBy()<\/code> method to sort a list of <code>Employee<\/code> objects by names alphabetically:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" 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;\r\n\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Employee<\/span>\r\n{\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">string<\/span>? Name { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">string<\/span>? Department { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">int<\/span> Salary { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\r\n}\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Program<\/span>\r\n{\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">Main<\/span>(<span class=\"hljs-params\"><\/span>)<\/span>\r\n    {\r\n        <span class=\"hljs-keyword\">var<\/span> employees = <span class=\"hljs-keyword\">new<\/span> List&lt;Employee&gt;() \r\n        {\r\n                <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"John\"<\/span>, Department = <span class=\"hljs-string\">\"HR\"<\/span>, Salary = <span class=\"hljs-number\">50000<\/span> },\r\n                <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"Jane\"<\/span>, Department = <span class=\"hljs-string\">\"IT\"<\/span>, Salary = <span class=\"hljs-number\">60000<\/span> },\r\n                <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"Bob\"<\/span>, Department = <span class=\"hljs-string\">\"HR\"<\/span>, Salary = <span class=\"hljs-number\">45000<\/span> },\r\n                <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"Sara\"<\/span>, Department = <span class=\"hljs-string\">\"IT\"<\/span>, Salary = <span class=\"hljs-number\">55000<\/span> },\r\n                <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"Tom\"<\/span>, Department = <span class=\"hljs-string\">\"IT\"<\/span>, Salary = <span class=\"hljs-number\">65000<\/span> }\r\n            };\r\n\r\n        <span class=\"hljs-keyword\">var<\/span> results = employees.OrderBy(e =&gt; e.Name);\r\n\r\n        <span class=\"hljs-keyword\">foreach<\/span> (<span class=\"hljs-keyword\">var<\/span> employee <span class=\"hljs-keyword\">in<\/span> results)\r\n        {\r\n            WriteLine(<span class=\"hljs-string\">$\"<span class=\"hljs-subst\">{employee.Name}<\/span> - <span class=\"hljs-subst\">{employee.Salary:C}<\/span>\"<\/span>);\r\n        }\r\n    }\r\n}\r\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><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-13\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\">Bob - $<span class=\"hljs-number\">45<\/span>,<span class=\"hljs-number\">000.00<\/span>\nJane - $<span class=\"hljs-number\">60<\/span>,<span class=\"hljs-number\">000.00<\/span>\nJohn - $<span class=\"hljs-number\">50<\/span>,<span class=\"hljs-number\">000.00<\/span>\nSara - $<span class=\"hljs-number\">55<\/span>,<span class=\"hljs-number\">000.00<\/span>\nTom - $<span class=\"hljs-number\">65<\/span>,<span class=\"hljs-number\">000.00<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><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>How it works.<\/p>\n\n\n\n<p>First, define the <code>Employee<\/code> class that has three properties: <code>Name<\/code>, <code>Department<\/code>, and <code>Salary<\/code>.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-14\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Employee<\/span>\n{\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">string<\/span>? Name { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">string<\/span>? Department { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">int<\/span> Salary { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-14\"><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>Second, create a new <code>List&lt;Employee><\/code> and initialize it with some <code>Employee<\/code> objects:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-15\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-keyword\">var<\/span> employees = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-keyword\">List<\/span>&lt;Employee&gt;() \n{\n    <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"John\"<\/span>, Department = <span class=\"hljs-string\">\"HR\"<\/span>, Salary = <span class=\"hljs-number\">50000<\/span> },\n    <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"Jane\"<\/span>, Department = <span class=\"hljs-string\">\"IT\"<\/span>, Salary = <span class=\"hljs-number\">60000<\/span> },\n    <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"Bob\"<\/span>, Department = <span class=\"hljs-string\">\"HR\"<\/span>, Salary = <span class=\"hljs-number\">45000<\/span> },\n    <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"Sara\"<\/span>, Department = <span class=\"hljs-string\">\"IT\"<\/span>, Salary = <span class=\"hljs-number\">55000<\/span> },\n    <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"Tom\"<\/span>, Department = <span class=\"hljs-string\">\"IT\"<\/span>, Salary = <span class=\"hljs-number\">65000<\/span> }\n};<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-15\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Third, sort the <code>Employee<\/code> objects by their names using the <code>OrderBy()<\/code> method. The lambda expression <code>e => e.Name<\/code> specifies the sort key (<code>Name<\/code>) for ordering.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-16\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">var<\/span> results = employees.OrderBy(e =&gt; e.Name);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-16\"><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>Third, write the sorted list of <code>Employee<\/code> object to the console:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-17\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\"><span class=\"hljs-keyword\">foreach<\/span> (<span class=\"hljs-keyword\">var<\/span> employee <span class=\"hljs-keyword\">in<\/span> results)\n{\n    WriteLine(<span class=\"hljs-string\">$\"<span class=\"hljs-subst\">{employee.Name}<\/span> - <span class=\"hljs-subst\">{employee.Salary:C}<\/span>\"<\/span>);\n\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-17\"><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>Similarly, the following example demonstrates how to sort the <code>employees<\/code> list by <code>salary<\/code> in ascending order:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-18\" 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;\r\n\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Employee<\/span>\r\n{\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">string<\/span>? Name { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">string<\/span>? Department { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">int<\/span> Salary { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\r\n}\n\r\n<span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Program<\/span>\r\n{\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">Main<\/span>(<span class=\"hljs-params\"><\/span>)<\/span>\r\n    {\r\n        <span class=\"hljs-keyword\">var<\/span> employees = <span class=\"hljs-keyword\">new<\/span> List&lt;Employee&gt;() \r\n        {\r\n                <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"John\"<\/span>, Department = <span class=\"hljs-string\">\"HR\"<\/span>, Salary = <span class=\"hljs-number\">50000<\/span> },\r\n                <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"Jane\"<\/span>, Department = <span class=\"hljs-string\">\"IT\"<\/span>, Salary = <span class=\"hljs-number\">60000<\/span> },\r\n                <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"Bob\"<\/span>, Department = <span class=\"hljs-string\">\"HR\"<\/span>, Salary = <span class=\"hljs-number\">45000<\/span> },\r\n                <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"Sara\"<\/span>, Department = <span class=\"hljs-string\">\"IT\"<\/span>, Salary = <span class=\"hljs-number\">55000<\/span> },\r\n                <span class=\"hljs-keyword\">new<\/span> Employee { Name = <span class=\"hljs-string\">\"Tom\"<\/span>, Department = <span class=\"hljs-string\">\"IT\"<\/span>, Salary = <span class=\"hljs-number\">65000<\/span> }\r\n            };\r\n\r\n        <span class=\"hljs-keyword\">var<\/span> results = employees.OrderBy(e =&gt; e.Salary);\r\n\r\n        <span class=\"hljs-keyword\">foreach<\/span> (<span class=\"hljs-keyword\">var<\/span> employee <span class=\"hljs-keyword\">in<\/span> results)\r\n        {\r\n            WriteLine(<span class=\"hljs-string\">$\"<span class=\"hljs-subst\">{employee.Name}<\/span> - <span class=\"hljs-subst\">{employee.Salary:C}<\/span>\"<\/span>);\r\n        }\r\n    }\r\n}\r\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-18\"><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-19\" data-shcb-language-name=\"C#\" data-shcb-language-slug=\"cs\"><span><code class=\"hljs language-cs\">Bob - $<span class=\"hljs-number\">45<\/span>,<span class=\"hljs-number\">000.00<\/span>\nJohn - $<span class=\"hljs-number\">50<\/span>,<span class=\"hljs-number\">000.00<\/span>\nSara - $<span class=\"hljs-number\">55<\/span>,<span class=\"hljs-number\">000.00<\/span>\nJane - $<span class=\"hljs-number\">60<\/span>,<span class=\"hljs-number\">000.00<\/span>\nTom - $<span class=\"hljs-number\">65<\/span>,<span class=\"hljs-number\">000.00<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-19\"><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<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the LINQ <code>OrderBy()<\/code> method to sort a sequence of objects by a key in ascending 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 ?<\/div>\n\t\t<div class=\"wth-thumbs\">\n\t\t\t<button\n\t\t\t\tdata-post=\"950\"\n\t\t\t\tdata-post-url=\"https:\/\/www.csharptutorial.net\/csharp-linq\/linq-orderby\/\"\n\t\t\t\tdata-post-title=\"LINQ OrderBy\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded wth-yes-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t\tclass=\"feather feather-thumbs-up block w-full h-full\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M14 9V5a3 3 0 0 0-3-3l-4 9v11h11.28a2 2 0 0 0 2-1.7l1.38-9a2 2 0 0 0-2-2.3zM7 22H4a2 2 0 0 1-2-2v-7a2 2 0 0 1 2-2h3\"\n\t\t\t\t\t><\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t<span 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