{"id":21324,"date":"2024-03-16T16:30:21","date_gmt":"2024-03-16T07:30:21","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%a7base64%e3%82%a8%e3%83%b3%e3%82%b3%e3%83%bc%e3%83%89%e3%81%a8%e3%83%87%e3%82%b3%e3%83%bc%e3%83%89%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7\/"},"modified":"2025-08-07T05:57:47","modified_gmt":"2025-08-06T20:57:47","slug":"c%e3%81%a7base64%e3%82%a8%e3%83%b3%e3%82%b3%e3%83%bc%e3%83%89%e3%81%a8%e3%83%87%e3%82%b3%e3%83%bc%e3%83%89%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%a7base64%e3%82%a8%e3%83%b3%e3%82%b3%e3%83%bc%e3%83%89%e3%81%a8%e3%83%87%e3%82%b3%e3%83%bc%e3%83%89%e3%82%92%e5%ae%9f%e8%a3%85%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7\/","title":{"rendered":"C#\u3067Base64\u30a8\u30f3\u30b3\u30fc\u30c9\u3068\u30c7\u30b3\u30fc\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\u3002"},"content":{"rendered":"<p>C#\u3067\u306f\u3001Base64\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306bSystem.Convert\u30af\u30e9\u30b9\u306eToBase64String\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3001Base64\u30c7\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306bSystem.Convert\u30af\u30e9\u30b9\u306eFromBase64String\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u4ee3\u7801\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u6267\u884cBase64\u7f16\u7801\u548c\u89e3\u7801\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">using<\/span> System;\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-built_in\">string<\/span> originalString = <span class=\"hljs-string\">\"Hello, World!\"<\/span>;\r\n        \r\n        <span class=\"hljs-comment\">\/\/ Base64\u7f16\u7801<\/span>\r\n        <span class=\"hljs-built_in\">string<\/span> base64String = Base64Encode(originalString);\r\n        Console.WriteLine(<span class=\"hljs-string\">\"Base64\u7f16\u7801\u540e\u7684\u5b57\u7b26\u4e32\uff1a{0}\"<\/span>, base64String);\r\n        \r\n        <span class=\"hljs-comment\">\/\/ Base64\u89e3\u7801<\/span>\r\n        <span class=\"hljs-built_in\">string<\/span> decodedString = Base64Decode(base64String);\r\n        Console.WriteLine(<span class=\"hljs-string\">\"Base64\u89e3\u7801\u540e\u7684\u5b57\u7b26\u4e32\uff1a{0}\"<\/span>, decodedString);\r\n    }\r\n    \r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-built_in\">string<\/span> <span class=\"hljs-title\">Base64Encode<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">string<\/span> plainText<\/span>)<\/span>\r\n    {\r\n        <span class=\"hljs-built_in\">byte<\/span>[] plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);\r\n        <span class=\"hljs-keyword\">return<\/span> Convert.ToBase64String(plainTextBytes);\r\n    }\r\n    \r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-built_in\">string<\/span> <span class=\"hljs-title\">Base64Decode<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">string<\/span> base64EncodedText<\/span>)<\/span>\r\n    {\r\n        <span class=\"hljs-built_in\">byte<\/span>[] base64EncodedBytes = Convert.FromBase64String(base64EncodedText);\r\n        <span class=\"hljs-keyword\">return<\/span> System.Text.Encoding.UTF8.GetString(base64EncodedBytes);\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u7d50\u679c\u306e\u51fa\u529b:<\/p>\n<pre class=\"post-pre\"><code>Base64\u7f16\u7801\u540e\u7684\u5b57\u7b26\u4e32\uff1aSGVsbG8sIFdvcmxkIQ==\r\nBase64\u89e3\u7801\u540e\u7684\u5b57\u7b26\u4e32\uff1aHello, World!\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u6700\u521d\u306b\u30a8\u30f3\u30b3\u30fc\u30c9\u3059\u308b\u5143\u306e\u6587\u5b57\u5217\u3067\u3042\u308boriginalString\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u305d\u306e\u6587\u5b57\u5217\u3092Base64\u30a8\u30f3\u30b3\u30fc\u30c9\u3059\u308bBase64Encode\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3001Base64\u30a8\u30f3\u30b3\u30fc\u30c9\u3055\u308c\u305f\u6587\u5b57\u5217base64String\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001base64String\u3092\u30c7\u30b3\u30fc\u30c9\u3059\u308bBase64Decode\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3001\u30c7\u30b3\u30fc\u30c9\u3055\u308c\u305f\u6587\u5b57\u5217decodedString\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n<p>Base64Encode\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6700\u521d\u306b\u5143\u306e\u6587\u5b57\u5217\u3092UTF-8\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u30d0\u30a4\u30c8\u914d\u5217\u306b\u5909\u63db\u3057\u3001\u305d\u308c\u304b\u3089Convert.ToBase64String\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u30d0\u30a4\u30c8\u914d\u5217\u3092Base64\u6587\u5b57\u5217\u306b\u5909\u63db\u3057\u3001\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>Base64Decode\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u307e\u305aBase64\u30a8\u30f3\u30b3\u30fc\u30c9\u3055\u308c\u305f\u6587\u5b57\u5217\u3092\u30d0\u30a4\u30c8\u914d\u5217\u306b\u5909\u63db\u3057\u3001\u305d\u306e\u5f8cSystem.Text.Encoding.UTF8.GetString\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u30d0\u30a4\u30c8\u914d\u5217\u3092UTF-8\u30a8\u30f3\u30b3\u30fc\u30c9\u306e\u6587\u5b57\u5217\u306b\u5909\u63db\u3057\u3001\u305d\u308c\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C#\u3067\u306f\u3001Base64\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306bSystem.Convert\u30af\u30e9\u30b9\u306eToBase64String\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3001Base64\u30c7\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306bSystem.Convert\u30af\u30e9\u30b9\u306eFro [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-21324","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"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>C#\u3067Base64\u30a8\u30f3\u30b3\u30fc\u30c9\u3068\u30c7\u30b3\u30fc\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\u3002 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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