{"id":5922,"date":"2022-01-11T14:56:35","date_gmt":"2022-01-11T13:56:35","guid":{"rendered":"https:\/\/solidt.eu\/site\/?p=5922"},"modified":"2022-07-25T08:30:36","modified_gmt":"2022-07-25T07:30:36","slug":"c-simple-data-collection-with-dictionary","status":"publish","type":"post","link":"https:\/\/solidt.eu\/site\/c-simple-data-collection-with-dictionary\/","title":{"rendered":"C# Simple Data Collection with dictionary"},"content":{"rendered":"\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;\nusing System.Collections.Generic;\n\npublic class DataCollection&lt;TClass, TKey> : IEnumerable&lt;TClass>\n{\n    private readonly Dictionary&lt;TKey, TClass> itemsByKey;\n\n    public DataCollection(IEnumerable&lt;TClass> items, Func&lt;TClass, TKey> keySelector)\n    {\n        itemsByKey = ToDictionarySafe(items, keySelector);\n    }\n\n    private IEnumerable&lt;TClass> AsEnumerable() => itemsByKey.Values;\n\n    public TClass GetKey(TKey key, TClass def = default(TClass))\n    {\n        if (itemsByKey.TryGetValue(key, out var val)) return val;\n        return def;\n    }\n\n    public IEnumerator&lt;TClass> GetEnumerator() => AsEnumerable().GetEnumerator();\n\n    IEnumerator IEnumerable.GetEnumerator() => AsEnumerable().GetEnumerator();\n\n    public static Dictionary&lt;Y, T> ToDictionarySafe&lt;T, Y>(IEnumerable&lt;T> items, Func&lt;T, Y> keySelector)\n    {\n        var dict = new Dictionary&lt;Y, T>();\n        foreach (var item in items)\n        {\n            var key = keySelector(item);\n            if (key != null &amp;&amp; !dict.ContainsKey(key))\n            {\n                dict[key] = item;\n            }\n        }\n        return dict;\n    }\n}<\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"","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-5922","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\/5922","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=5922"}],"version-history":[{"count":1,"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/posts\/5922\/revisions"}],"predecessor-version":[{"id":5923,"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/posts\/5922\/revisions\/5923"}],"wp:attachment":[{"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/media?parent=5922"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/categories?post=5922"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/solidt.eu\/site\/wp-json\/wp\/v2\/tags?post=5922"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}