{"id":11605,"date":"2024-03-14T14:24:42","date_gmt":"2024-03-14T14:24:42","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-achieve-deep-copy-in-hashmapex-in-c\/"},"modified":"2025-08-04T14:12:33","modified_gmt":"2025-08-04T14:12:33","slug":"how-to-achieve-deep-copy-in-hashmapex-in-c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-achieve-deep-copy-in-hashmapex-in-c\/","title":{"rendered":"Deep Copy Dictionary in C#"},"content":{"rendered":"<p>In C#, implementing a deep copy of a HashMap can be achieved through the following steps:<\/p>\n<ol>\n<li>Create a new HashMap object.<\/li>\n<li>Iterate through each key-value pair in the original HashMap and make a deep copy of both the key and the value.<\/li>\n<li>Add the deep-copied key-value pairs to a new HashMap object.<\/li>\n<\/ol>\n<p>Here is an example code to achieve a deep copy of a HashMap:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">using<\/span> System;\r\n<span class=\"hljs-keyword\">using<\/span> System.Collections.Generic;\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\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">Main<\/span>()<\/span>\r\n    {\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u4e00\u4e2a\u539f\u59cb\u7684HashMap\u5bf9\u8c61<\/span>\r\n        Dictionary&lt;<span class=\"hljs-built_in\">string<\/span>, List&lt;<span class=\"hljs-built_in\">int<\/span>&gt;&gt; originalMap = <span class=\"hljs-keyword\">new<\/span> Dictionary&lt;<span class=\"hljs-built_in\">string<\/span>, List&lt;<span class=\"hljs-built_in\">int<\/span>&gt;&gt;();\r\n        originalMap.Add(<span class=\"hljs-string\">\"key1\"<\/span>, <span class=\"hljs-keyword\">new<\/span> List&lt;<span class=\"hljs-built_in\">int<\/span>&gt; { <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span> });\r\n        originalMap.Add(<span class=\"hljs-string\">\"key2\"<\/span>, <span class=\"hljs-keyword\">new<\/span> List&lt;<span class=\"hljs-built_in\">int<\/span>&gt; { <span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">5<\/span>, <span class=\"hljs-number\">6<\/span> });\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u4e00\u4e2a\u65b0\u7684HashMap\u5bf9\u8c61\u7528\u4e8e\u6df1\u62f7\u8d1d<\/span>\r\n        Dictionary&lt;<span class=\"hljs-built_in\">string<\/span>, List&lt;<span class=\"hljs-built_in\">int<\/span>&gt;&gt; deepCopyMap = <span class=\"hljs-keyword\">new<\/span> Dictionary&lt;<span class=\"hljs-built_in\">string<\/span>, List&lt;<span class=\"hljs-built_in\">int<\/span>&gt;&gt;();\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u904d\u5386\u539f\u59cbHashMap\uff0c\u5e76\u8fdb\u884c\u6df1\u62f7\u8d1d<\/span>\r\n        <span class=\"hljs-keyword\">foreach<\/span> (<span class=\"hljs-keyword\">var<\/span> kvp <span class=\"hljs-keyword\">in<\/span> originalMap)\r\n        {\r\n            <span class=\"hljs-built_in\">string<\/span> key = kvp.Key;\r\n            List&lt;<span class=\"hljs-built_in\">int<\/span>&gt; <span class=\"hljs-keyword\">value<\/span> = <span class=\"hljs-keyword\">new<\/span> List&lt;<span class=\"hljs-built_in\">int<\/span>&gt;(kvp.Value); <span class=\"hljs-comment\">\/\/ \u6df1\u62f7\u8d1d<\/span>\r\n\r\n            deepCopyMap.Add(key, <span class=\"hljs-keyword\">value<\/span>);\r\n        }\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\u539f\u59cbHashMap\u548c\u6df1\u62f7\u8d1d\u540e\u7684HashMap<\/span>\r\n        Console.WriteLine(<span class=\"hljs-string\">\"Original Map:\"<\/span>);\r\n        <span class=\"hljs-keyword\">foreach<\/span> (<span class=\"hljs-keyword\">var<\/span> kvp <span class=\"hljs-keyword\">in<\/span> originalMap)\r\n        {\r\n            Console.WriteLine(<span class=\"hljs-string\">$\"<span class=\"hljs-subst\">{kvp.Key}<\/span>: <span class=\"hljs-subst\">{<span class=\"hljs-built_in\">string<\/span>.Join(<span class=\"hljs-string\">\",\"<\/span>, kvp.Value)}<\/span>\"<\/span>);\r\n        }\r\n\r\n        Console.WriteLine(<span class=\"hljs-string\">\"\\nDeep Copy Map:\"<\/span>);\r\n        <span class=\"hljs-keyword\">foreach<\/span> (<span class=\"hljs-keyword\">var<\/span> kvp <span class=\"hljs-keyword\">in<\/span> deepCopyMap)\r\n        {\r\n            Console.WriteLine(<span class=\"hljs-string\">$\"<span class=\"hljs-subst\">{kvp.Key}<\/span>: <span class=\"hljs-subst\">{<span class=\"hljs-built_in\">string<\/span>.Join(<span class=\"hljs-string\">\",\"<\/span>, kvp.Value)}<\/span>\"<\/span>);\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>In the code above, we used List<int> as the value, and performed a deep copy on the value. By creating a new List object and copying the elements from the original List to the new List, we achieved a deep copy. You can modify the code as needed to suit your requirements.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C#, implementing a deep copy of a HashMap can be achieved through the following steps: Create a new HashMap object. Iterate through each key-value pair in the original HashMap and make a deep copy of both the key and the value. Add the deep-copied key-value pairs to a new HashMap object. Here is an [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[274,536,3153,4751,5629],"class_list":["post-11605","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-c","tag-collections","tag-deep-copy","tag-dictionary","tag-serialization"],"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>Deep Copy Dictionary in C# - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to deep copy C# Dictionary objects with step-by-step examples. Clone collections safely.\" \/>\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-to-achieve-deep-copy-in-hashmapex-in-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Deep Copy Dictionary in C#\" \/>\n<meta property=\"og:description\" content=\"Learn how to deep copy C# Dictionary objects with step-by-step examples. 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