{"id":26294,"date":"2022-12-16T21:33:40","date_gmt":"2022-12-16T16:03:40","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-foreach-loop-in-linq-without-loop\/"},"modified":"2022-12-16T21:33:40","modified_gmt":"2022-12-16T16:03:40","slug":"solved-foreach-loop-in-linq-without-loop","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-foreach-loop-in-linq-without-loop\/","title":{"rendered":"[Solved] Foreach loop in LINQ without loop"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-23516708\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"23516708\" data-parentid=\"23515775\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>Treating this as a kind of code-golf, the following gives an idea as to how you can approach the problem from a functional mindset, where you try and &#8216;flow&#8217; the results of one function through another (which is presumably what your manager is after).<\/p>\n<p>Some changes are possible:<\/p>\n<ul>\n<li>Replacing the <code>if<\/code> with a filter predicate on the set<\/li>\n<li>By changing the recursive method <code>AddNodes()<\/code> to return the node, it can be used in a fluent style.<\/li>\n<\/ul>\n<p>There also an obvious design mismatch given that <code>TreeViews<\/code> weren&#8217;t designed with FP in mind, and instead encourage iterative mutation to the tree to build it up.<br \/>\nSadly, <code>TreeNodeCollection<\/code> has no direct setter, nor an <code>AddRange<\/code>. So the horrid <code>ForEach<\/code> mutation seems necessary.<\/p>\n<p>As a result, it is moot whether this constitutes any kind of improvement to your imperative original solution (Unless the rest of your code base is maintained by a bunch of F# or Haskell programmers). A <code>TreeView<\/code> which can be constructed in one projection would IMO be a pre-requisite for the switch to this approach.<\/p>\n<pre><code>\/\/ Recursive Funcs need to be forward-declared\nFunc&lt;DirectoryEntry, TreeNode, TreeNode&gt; addNodes = null;\naddNodes = (entry, node) =&gt;\n    {\n        entry.Children\n           .Cast&lt;DirectoryEntry&gt;()\n           .ToList() \/\/ Needed for ForEach\n           .ForEach(\n             child =&gt;\n               node.ChildNodes.Add(\n                     addNodes(child,\n                    new TreeNode(child.Name.Substring(child.Name.IndexOf('=') + 1)))));\n        return node;\n    };\n\nOUs.Where(ou =&gt; ou.SchemaClassName.Contains(\"organizationalUnit\"))\n    .ToList()\n    .ForEach(ou =&gt;\n            rootNode.ChildNodes.Add(addNodes(ou, \n                 new TreeNode(ou.Name.Substring(ou.Name.IndexOf('=') + 1)))));\ntreeView1.Nodes.Add(rootNode);\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">2<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Foreach loop in LINQ without loop <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Treating this as a kind of code-golf, the following gives an idea as to how you can approach the problem from a functional mindset, where you try and &#8216;flow&#8217; the results of one function through another (which is presumably what your manager is after). Some changes are possible: Replacing the if with a filter &#8230; <a title=\"[Solved] Foreach loop in LINQ without loop\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-foreach-loop-in-linq-without-loop\/\" aria-label=\"More on [Solved] Foreach loop in LINQ without loop\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[2769,751,324,995,578],"class_list":["post-26294","post","type-post","status-publish","format-standard","hentry","category-solved","tag-active-directory","tag-asp-net","tag-c","tag-lambda","tag-linq"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] Foreach loop in LINQ without loop - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-foreach-loop-in-linq-without-loop\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Foreach loop in LINQ without loop - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Treating this as a kind of code-golf, the following gives an idea as to how you can approach the problem from a functional mindset, where you try and &#8216;flow&#8217; the results of one function through another (which is presumably what your manager is after). 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