{"id":21112,"date":"2024-03-15T21:31:00","date_gmt":"2024-03-15T21:31:00","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-is-the-usage-of-groupby-in-linq\/"},"modified":"2024-03-21T19:42:34","modified_gmt":"2024-03-21T19:42:34","slug":"how-is-the-usage-of-groupby-in-linq","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-is-the-usage-of-groupby-in-linq\/","title":{"rendered":"How is the usage of groupby in LINQ?"},"content":{"rendered":"<p>In LINQ, the GroupBy method is used to group elements in a sequence based on a specified key. It returns a sequence containing the grouped elements. The GroupBy method can take a key selector function to extract keys from the elements in the sequence. Here is the syntax for the GroupBy method:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-title\">IEnumerable<\/span>&lt;<span class=\"hljs-title\">IGrouping<\/span>&lt;<span class=\"hljs-title\">TKey<\/span>, <span class=\"hljs-title\">TSource<\/span>&gt;&gt; <span class=\"hljs-title\">GroupBy<\/span>&lt;<span class=\"hljs-title\">TSource<\/span>, <span class=\"hljs-title\">TKey<\/span>&gt;(<span class=\"hljs-params\">\r\n    <span class=\"hljs-keyword\">this<\/span> IEnumerable&lt;TSource&gt; source,\r\n    Func&lt;TSource, TKey&gt; keySelector\r\n<\/span>)\r\n<\/span><\/code><\/pre>\n<p>In the above syntax, the source represents the sequence to be grouped, and the keySelector is a function that returns a key for each element.<\/p>\n<p>Here is an example demonstrating how to use the GroupBy method:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">var<\/span> students = <span class=\"hljs-keyword\">new<\/span> List&lt;Student&gt;()\r\n{\r\n    <span class=\"hljs-keyword\">new<\/span> Student { Name = <span class=\"hljs-string\">\"John\"<\/span>, Age = <span class=\"hljs-number\">20<\/span> },\r\n    <span class=\"hljs-keyword\">new<\/span> Student { Name = <span class=\"hljs-string\">\"Jane\"<\/span>, Age = <span class=\"hljs-number\">19<\/span> },\r\n    <span class=\"hljs-keyword\">new<\/span> Student { Name = <span class=\"hljs-string\">\"Tom\"<\/span>, Age = <span class=\"hljs-number\">20<\/span> },\r\n    <span class=\"hljs-keyword\">new<\/span> Student { Name = <span class=\"hljs-string\">\"Alice\"<\/span>, Age = <span class=\"hljs-number\">19<\/span> },\r\n    <span class=\"hljs-keyword\">new<\/span> Student { Name = <span class=\"hljs-string\">\"Bob\"<\/span>, Age = <span class=\"hljs-number\">21<\/span> }\r\n};\r\n\r\n<span class=\"hljs-keyword\">var<\/span> groupedStudents = students.GroupBy(s =&gt; s.Age);\r\n\r\n<span class=\"hljs-keyword\">foreach<\/span> (<span class=\"hljs-keyword\">var<\/span> <span class=\"hljs-keyword\">group<\/span> <span class=\"hljs-keyword\">in<\/span> groupedStudents)\r\n{\r\n    Console.WriteLine(<span class=\"hljs-string\">$\"Age: <span class=\"hljs-subst\">{<span class=\"hljs-keyword\">group<\/span>.Key}<\/span>\"<\/span>);\r\n\r\n    <span class=\"hljs-keyword\">foreach<\/span> (<span class=\"hljs-keyword\">var<\/span> student <span class=\"hljs-keyword\">in<\/span> <span class=\"hljs-keyword\">group<\/span>)\r\n    {\r\n        Console.WriteLine(<span class=\"hljs-string\">$\"Name: <span class=\"hljs-subst\">{student.Name}<\/span>\"<\/span>);\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>In the above example, we used the GroupBy method to group students based on their age. Then, within a foreach loop, we iterate through each group and print out the age along with the student&#8217;s name.<\/p>\n<p>The output will be as follows:<\/p>\n<pre class=\"post-pre\"><code>Age: 20\r\nName: John\r\nName: Tom\r\n\r\nAge: 19\r\nName: Jane\r\nName: Alice\r\n\r\nAge: 21\r\nName: Bob\r\n<\/code><\/pre>\n<p>The Student class in the above example is defined as follows:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Student<\/span>\r\n{\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-built_in\">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-built_in\">int<\/span> Age { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">set<\/span>; }\r\n}\r\n<\/code><\/pre>\n<p>Please note that the GroupBy method returns an IEnumerable<IGrouping<TKey, TSource>>, where IGrouping<TKey, TSource> is an interface that represents a collection of elements with the same key.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In LINQ, the GroupBy method is used to group elements in a sequence based on a specified key. It returns a sequence containing the grouped elements. The GroupBy method can take a key selector function to extract keys from the elements in the sequence. Here is the syntax for the GroupBy method: public static IEnumerable&lt;IGrouping&lt;TKey, [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-21112","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How is the usage of groupby in LINQ? - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-is-the-usage-of-groupby-in-linq\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How is the usage of groupby in LINQ?\" \/>\n<meta property=\"og:description\" content=\"In LINQ, the GroupBy method is used to group elements in a sequence based on a specified key. 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