{"id":6110,"date":"2022-04-07T13:05:53","date_gmt":"2022-04-07T12:05:53","guid":{"rendered":"https:\/\/solidt.eu\/site\/?p=6110"},"modified":"2023-05-15T07:59:02","modified_gmt":"2023-05-15T06:59:02","slug":"c-lookup-helper","status":"publish","type":"post","link":"https:\/\/solidt.eu\/site\/c-lookup-helper\/","title":{"rendered":"C# LookUp helper"},"content":{"rendered":"\n<p>Mainly because ToDictionary\/ToLookup crashes on null \/ duplicate values + IDictionary TryGetValue is cumbersome<\/p>\n\n\n\n<div style=\"height: 250px; position:relative; margin-bottom: 50px;\" class=\"wp-block-simple-code-block-ace\"><pre class=\"wp-block-simple-code-block-ace\" style=\"position:absolute;top:0;right:0;bottom:0;left:0\" data-mode=\"csharp\" data-theme=\"monokai\" data-fontsize=\"14\" data-lines=\"Infinity\" data-showlines=\"true\" data-copy=\"false\">using System;\nusing System.Collections.Generic;\n\nnamespace Domain.Helpers\n{\n    public interface IDict&lt;Key, T>\n    {\n        T ByKey(Key key);\n    }\n\n    public class LookUpHelper\n    {\n        public static IDict&lt;Key, T> From&lt;Key, T>(IEnumerable&lt;T> items, Func&lt;T, Key> keySelector) => new LookUp&lt;Key, T>(items, keySelector);\n\n        private class LookUp&lt;Key, T> : IDict&lt;Key, T>\n        {\n            public LookUp(IEnumerable&lt;T> items, Func&lt;T, Key> keySelector)\n            {\n                Items = ToDictionarySafe(items, keySelector);\n            }\n            public LookUp(IDictionary&lt;Key, T> items)\n            {\n                Items = items;\n            }\n            private IDictionary&lt;Key, T> Items { get; }\n            public T ByKey(Key key)\n            {\n                if (key == null) return default;\n                Items.TryGetValue(key, out var val);\n                return val;\n            }\n            private Dictionary&lt;Key, T> ToDictionarySafe(IEnumerable&lt;T> items, Func&lt;T, Key> keySelector)\n            {\n                var dict = new Dictionary&lt;Key, T>();\n                foreach (var item in items)\n                {\n                    var key = keySelector(item);\n                    if (key == null || dict.ContainsKey(key)) continue;\n                    dict[key] = item;\n                }\n                return dict;\n            }\n        }\n    }\n}\n<\/pre><\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mainly because ToDictionary\/ToLookup crashes on null \/ duplicate values + IDictionary TryGetValue is cumbersome<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[6,4,1],"tags":[],"class_list":["post-6110","post","type-post","status-publish","format-standard","hentry","category-dotnet","category-programming","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/posts\/6110","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/comments?post=6110"}],"version-history":[{"count":9,"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/posts\/6110\/revisions"}],"predecessor-version":[{"id":7799,"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/posts\/6110\/revisions\/7799"}],"wp:attachment":[{"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/media?parent=6110"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/categories?post=6110"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/tags?post=6110"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}