{"id":6446,"date":"2024-03-14T17:55:49","date_gmt":"2024-03-14T08:55:49","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/winform%e3%81%a7webapi%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e3%82%a2%e3%83%83%e3%83%97%e3%83%ad%e3%83%bc%e3%83%89%e3%81%99%e3%82%8b%e6%96%b9\/"},"modified":"2025-08-03T09:08:23","modified_gmt":"2025-08-03T00:08:23","slug":"winform%e3%81%a7webapi%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e3%82%a2%e3%83%83%e3%83%97%e3%83%ad%e3%83%bc%e3%83%89%e3%81%99%e3%82%8b%e6%96%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/winform%e3%81%a7webapi%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e3%82%a2%e3%83%83%e3%83%97%e3%83%ad%e3%83%bc%e3%83%89%e3%81%99%e3%82%8b%e6%96%b9\/","title":{"rendered":"Winform\u304b\u3089WebAPI\u3078\u30d5\u30a1\u30a4\u30eb\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>WinForm\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5185\u304b\u3089WebAPI\u3092\u547c\u3073\u51fa\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u306b\u306f\u3001HttpClient\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066HTTP\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u9001\u4fe1\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u3053\u306e\u76ee\u6a19\u3092\u9054\u6210\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3059\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n<p>\u6700\u521d\u306b\u3001WinForm\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u30dc\u30bf\u30f3\u3068\u30d5\u30a1\u30a4\u30eb\u9078\u629e\u30c0\u30a4\u30a2\u30ed\u30b0\u30dc\u30c3\u30af\u30b9\u3092\u8ffd\u52a0\u3057\u3066\u3001\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u30d5\u30a1\u30a4\u30eb\u3092\u9078\u629e\u3057\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u5f8c\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u305f\u3081\u306b\u3001\u30dc\u30bf\u30f3\u306e\u30af\u30ea\u30c3\u30af\u30a4\u30d9\u30f3\u30c8\u3067\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><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\">btnUpload_Click<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">object<\/span> sender, EventArgs e<\/span>)<\/span>\r\n{\r\n    <span class=\"hljs-keyword\">using<\/span> (HttpClient client = <span class=\"hljs-keyword\">new<\/span> HttpClient())\r\n    {\r\n        <span class=\"hljs-comment\">\/\/ \u8bbe\u7f6eWebAPI\u7684URL<\/span>\r\n        <span class=\"hljs-built_in\">string<\/span> apiUrl = <span class=\"hljs-string\">\"http:\/\/example.com\/api\/uploadfile\"<\/span>;\r\n\r\n        <span class=\"hljs-comment\">\/\/ \u9009\u62e9\u8981\u4e0a\u4f20\u7684\u6587\u4ef6<\/span>\r\n        OpenFileDialog openFileDialog = <span class=\"hljs-keyword\">new<\/span> OpenFileDialog();\r\n        <span class=\"hljs-keyword\">if<\/span> (openFileDialog.ShowDialog() == DialogResult.OK)\r\n        {\r\n            <span class=\"hljs-built_in\">string<\/span> filePath = openFileDialog.FileName;\r\n\r\n            <span class=\"hljs-comment\">\/\/ \u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9<\/span>\r\n            <span class=\"hljs-built_in\">byte<\/span>[] fileContent = File.ReadAllBytes(filePath);\r\n\r\n            <span class=\"hljs-comment\">\/\/ \u521b\u5efaMultipartFormDataContent\u5bf9\u8c61<\/span>\r\n            MultipartFormDataContent content = <span class=\"hljs-keyword\">new<\/span> MultipartFormDataContent();\r\n            ByteArrayContent fileContentData = <span class=\"hljs-keyword\">new<\/span> ByteArrayContent(fileContent);\r\n            content.Add(fileContentData, <span class=\"hljs-string\">\"file\"<\/span>, Path.GetFileName(filePath));\r\n\r\n            <span class=\"hljs-comment\">\/\/ \u53d1\u9001HTTP\u8bf7\u6c42<\/span>\r\n            HttpResponseMessage response = <span class=\"hljs-keyword\">await<\/span> client.PostAsync(apiUrl, content);\r\n\r\n            <span class=\"hljs-keyword\">if<\/span> (response.IsSuccessStatusCode)\r\n            {\r\n                MessageBox.Show(<span class=\"hljs-string\">\"\u6587\u4ef6\u4e0a\u4f20\u6210\u529f\uff01\"<\/span>);\r\n            }\r\n            <span class=\"hljs-keyword\">else<\/span>\r\n            {\r\n                MessageBox.Show(<span class=\"hljs-string\">\"\u6587\u4ef6\u4e0a\u4f20\u5931\u8d25\"<\/span>);\r\n            }\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001MultipartFormDataContent\u3068\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u5185\u5bb9\u3092\u9001\u4fe1\u3057\u3001WebAPI\u306e\u6307\u5b9aURL\u306bPOST\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u9001\u4fe1\u3059\u308b\u305f\u3081\u306bHttpClient\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u306b\u6210\u529f\u3057\u305f\u5834\u5408\u306f\u6210\u529f\u30e1\u30c3\u30bb\u30fc\u30b8\u30dc\u30c3\u30af\u30b9\u304c\u8868\u793a\u3055\u308c\u3001\u5931\u6557\u3057\u305f\u5834\u5408\u306f\u5931\u6557\u30e1\u30c3\u30bb\u30fc\u30b8\u30dc\u30c3\u30af\u30b9\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>WebAPI\u3092\u547c\u3073\u51fa\u3059\u524d\u306b\u3001WebAPI\u306eURL\u304c\u6b63\u3057\u304f\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3001\u30d5\u30a1\u30a4\u30eb\u9078\u629e\u30c0\u30a4\u30a2\u30ed\u30b0\u3067\u9078\u629e\u3055\u308c\u305f\u30d5\u30a1\u30a4\u30eb\u304c\u5b58\u5728\u3059\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>WinForm\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5185\u304b\u3089WebAPI\u3092\u547c\u3073\u51fa\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u306b\u306f\u3001HttpClient\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066HTTP\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u9001\u4fe1\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u3053\u306e\u76ee\u6a19\u3092\u9054\u6210\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3059\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u304c [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[365,85,1954,114,898],"class_list":["post-6446","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-net","tag-c","tag-webapi","tag-winform","tag-898"],"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>Winform\u304b\u3089WebAPI\u3078\u30d5\u30a1\u30a4\u30eb\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Winform\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304b\u3089WebAPI\u3092\u5229\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u624b\u9806\u3092\u89e3\u8aac\u3002C#\u3068.NET 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