{"id":23280,"date":"2024-03-16T21:54:27","date_gmt":"2024-03-16T12:54:27","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/c-%e3%81%a7-websocket-%e3%82%b5%e3%83%bc%e3%83%90%e3%82%92%e6%a7%8b%e7%af%89%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/"},"modified":"2025-08-07T15:05:34","modified_gmt":"2025-08-07T06:05:34","slug":"c-%e3%81%a7-websocket-%e3%82%b5%e3%83%bc%e3%83%90%e3%82%92%e6%a7%8b%e7%af%89%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c-%e3%81%a7-websocket-%e3%82%b5%e3%83%bc%e3%83%90%e3%82%92%e6%a7%8b%e7%af%89%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/","title":{"rendered":"C# \u3067 WebSocket \u30b5\u30fc\u30d0\u3092\u69cb\u7bc9\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"<p>C#\u3067WebSocket\u30b5\u30fc\u30d0\u30fc\u3092\u69cb\u7bc9\u3059\u308b\u65b9\u6cd5\u306f\u3001WebSocket\u30af\u30e9\u30b9\u3068\u95a2\u9023\u3059\u308b\u540d\u524d\u7a7a\u9593\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u7c21\u5358\u306a\u4f8b\u3067\u3059:<\/p>\n<ol>\n<li>\u6700\u521d\u306b\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u304cSystem.Net.WebSockets\u306e\u540d\u524d\u7a7a\u9593\u3092\u53c2\u7167\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>WebSocket\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u521d\u671f\u5316\u3059\u308bWebSocket\u30b5\u30fc\u30d0\u30fc\u5074\u306e\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u4f8b\uff1a<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">using<\/span> System;\r\n<span class=\"hljs-keyword\">using<\/span> System.Net;\r\n<span class=\"hljs-keyword\">using<\/span> System.Net.WebSockets;\r\n<span class=\"hljs-keyword\">using<\/span> System.Threading;\r\n<span class=\"hljs-keyword\">using<\/span> System.Threading.Tasks;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">MyWebSocketServer<\/span>\r\n{\r\n    <span class=\"hljs-keyword\">private<\/span> HttpListener _httpListener;\r\n    <span class=\"hljs-keyword\">private<\/span> CancellationTokenSource _cts;\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title\">MyWebSocketServer<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">string<\/span> url<\/span>)<\/span>\r\n    {\r\n        _httpListener = <span class=\"hljs-keyword\">new<\/span> HttpListener();\r\n        _httpListener.Prefixes.Add(url);\r\n        _cts = <span class=\"hljs-keyword\">new<\/span> CancellationTokenSource();\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">async<\/span> Task <span class=\"hljs-title\">Start<\/span>()<\/span>\r\n    {\r\n        _httpListener.Start();\r\n        Console.WriteLine(<span class=\"hljs-string\">\"WebSocket server started.\"<\/span>);\r\n\r\n        <span class=\"hljs-keyword\">while<\/span> (!_cts.Token.IsCancellationRequested)\r\n        {\r\n            HttpListenerContext context = <span class=\"hljs-keyword\">await<\/span> _httpListener.GetContextAsync();\r\n            <span class=\"hljs-keyword\">if<\/span> (context.Request.IsWebSocketRequest)\r\n            {\r\n                ProcessWebSocketRequest(context);\r\n            }\r\n            <span class=\"hljs-keyword\">else<\/span>\r\n            {\r\n                <span class=\"hljs-comment\">\/\/ Handle non-WebSocket request<\/span>\r\n                context.Response.StatusCode = <span class=\"hljs-number\">400<\/span>;\r\n                context.Response.Close();\r\n            }\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">async<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">ProcessWebSocketRequest<\/span>(<span class=\"hljs-params\">HttpListenerContext context<\/span>)<\/span>\r\n    {\r\n        HttpListenerWebSocketContext webSocketContext = <span class=\"hljs-literal\">null<\/span>;\r\n\r\n        <span class=\"hljs-keyword\">try<\/span>\r\n        {\r\n            webSocketContext = <span class=\"hljs-keyword\">await<\/span> context.AcceptWebSocketAsync(subProtocol: <span class=\"hljs-literal\">null<\/span>);\r\n            Console.WriteLine(<span class=\"hljs-string\">\"WebSocket connection established.\"<\/span>);\r\n\r\n            <span class=\"hljs-keyword\">await<\/span> HandleWebSocketConnection(webSocketContext.WebSocket);\r\n        }\r\n        <span class=\"hljs-keyword\">catch<\/span> (Exception ex)\r\n        {\r\n            Console.WriteLine(<span class=\"hljs-string\">\"WebSocket connection failed: \"<\/span> + ex.Message);\r\n            <span class=\"hljs-keyword\">if<\/span> (webSocketContext != <span class=\"hljs-literal\">null<\/span>)\r\n            {\r\n                webSocketContext.WebSocket.CloseAsync(WebSocketCloseStatus.InternalServerError, <span class=\"hljs-string\">\"Internal Server Error\"<\/span>, CancellationToken.None);\r\n            }\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">async<\/span> Task <span class=\"hljs-title\">HandleWebSocketConnection<\/span>(<span class=\"hljs-params\">WebSocket webSocket<\/span>)<\/span>\r\n    {\r\n        <span class=\"hljs-built_in\">byte<\/span>[] buffer = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">byte<\/span>[<span class=\"hljs-number\">1024<\/span>];\r\n        WebSocketReceiveResult result = <span class=\"hljs-keyword\">await<\/span> webSocket.ReceiveAsync(<span class=\"hljs-keyword\">new<\/span> ArraySegment&lt;<span class=\"hljs-built_in\">byte<\/span>&gt;(buffer), CancellationToken.None);\r\n\r\n        <span class=\"hljs-keyword\">while<\/span> (!result.CloseStatus.HasValue)\r\n        {\r\n            <span class=\"hljs-comment\">\/\/ Handle received data<\/span>\r\n            <span class=\"hljs-built_in\">string<\/span> receivedMessage = System.Text.Encoding.UTF8.GetString(buffer, <span class=\"hljs-number\">0<\/span>, result.Count);\r\n            Console.WriteLine(<span class=\"hljs-string\">\"Received: \"<\/span> + receivedMessage);\r\n\r\n            <span class=\"hljs-comment\">\/\/ Echo the received message back to the client<\/span>\r\n            <span class=\"hljs-keyword\">await<\/span> webSocket.SendAsync(<span class=\"hljs-keyword\">new<\/span> ArraySegment&lt;<span class=\"hljs-built_in\">byte<\/span>&gt;(buffer, <span class=\"hljs-number\">0<\/span>, result.Count), WebSocketMessageType.Text, <span class=\"hljs-literal\">true<\/span>, CancellationToken.None);\r\n\r\n            <span class=\"hljs-comment\">\/\/ Get next message<\/span>\r\n            result = <span class=\"hljs-keyword\">await<\/span> webSocket.ReceiveAsync(<span class=\"hljs-keyword\">new<\/span> ArraySegment&lt;<span class=\"hljs-built_in\">byte<\/span>&gt;(buffer), CancellationToken.None);\r\n        }\r\n\r\n        <span class=\"hljs-keyword\">await<\/span> webSocket.CloseAsync(result.CloseStatus.Value, result.CloseStatusDescription, CancellationToken.None);\r\n        Console.WriteLine(<span class=\"hljs-string\">\"WebSocket connection closed.\"<\/span>);\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">Stop<\/span>()<\/span>\r\n    {\r\n        _cts.Cancel();\r\n        _httpListener.Stop();\r\n        _httpListener.Close();\r\n    }\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5165\u308a\u53e3\u3067MyWebSocketServer\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3057\u3001\u30b5\u30fc\u30d0\u30fc\u3092\u8d77\u52d5\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\uff1a<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><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\">async<\/span> Task <span class=\"hljs-title\">Main<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">string<\/span>[] args<\/span>)<\/span>\r\n    {\r\n        <span class=\"hljs-built_in\">string<\/span> url = <span class=\"hljs-string\">\"http:\/\/localhost:8080\/\"<\/span>;\r\n        MyWebSocketServer server = <span class=\"hljs-keyword\">new<\/span> MyWebSocketServer(url);\r\n        <span class=\"hljs-keyword\">await<\/span> server.Start();\r\n\r\n        Console.WriteLine(<span class=\"hljs-string\">\"Press any key to stop the server.\"<\/span>);\r\n        Console.ReadKey();\r\n\r\n        server.Stop();\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306f\u3001\u6307\u5b9a\u3055\u308c\u305fURL\u3092\u76e3\u8996\u3057\u3001\u53d7\u4fe1\u3057\u305fWebSocket\u63a5\u7d9a\u3068\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u51e6\u7406\u3059\u308b\u5358\u7d14\u306aWebSocket\u30b5\u30fc\u30d0\u30fc\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u5909\u66f4\u3084\u62e1\u5f35\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C#\u3067WebSocket\u30b5\u30fc\u30d0\u30fc\u3092\u69cb\u7bc9\u3059\u308b\u65b9\u6cd5\u306f\u3001WebSocket\u30af\u30e9\u30b9\u3068\u95a2\u9023\u3059\u308b\u540d\u524d\u7a7a\u9593\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3059\u3002 \u4ee5\u4e0b\u306f\u7c21\u5358\u306a\u4f8b\u3067\u3059: \u6700\u521d\u306b\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u304cSystem.Net.WebSockets\u306e\u540d\u524d\u7a7a\u9593\u3092\u53c2\u7167\u3057\u3066 [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-23280","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# \u3067 WebSocket \u30b5\u30fc\u30d0\u3092\u69cb\u7bc9\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"C# \u3067 WebSocket 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\u3067 WebSocket \u30b5\u30fc\u30d0\u3092\u69cb\u7bc9\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/c-\u3067-websocket-\u30b5\u30fc\u30d0\u3092\u69cb\u7bc9\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-16T12:54:27+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-07T06:05:34+00:00\" \/>\n<meta name=\"author\" content=\"\u512a\u6597, \u671d\u967d\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" 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