{"id":648,"date":"2023-02-27T07:18:39","date_gmt":"2023-02-26T22:18:39","guid":{"rendered":"https:\/\/sumomo.ohwaki.jp\/wordpress\/?p=648"},"modified":"2023-02-28T08:46:20","modified_gmt":"2023-02-27T23:46:20","slug":"list-contains%e3%82%84indexof%e3%81%ae%e6%af%94%e8%bc%83%e3%82%92%e5%80%a4%e3%81%a7%e8%a1%8c%e3%81%86","status":"publish","type":"post","link":"https:\/\/sumomo.ohwaki.jp\/wordpress\/?p=648","title":{"rendered":"List.Contains\u3084IndexOf\u306e\u6bd4\u8f03\u3092\u5024\u3067\u884c\u3046"},"content":{"rendered":"\n

List<T>\u306a\u3069\u3067T\u304c\u53c2\u7167\u578b\u306e\u5834\u5408\u3001Contains\u3084IndexOf\u306f\u5024(\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u5bb9)\u3067\u306f\u306a\u304f\u3001\u53c2\u7167\u5148\u3092\u5224\u5b9a\u3059\u308b\u4ed5\u69d8\u3068\u306a\u3063\u3066\u3044\u308b\u3002<\/p>\n\n\n\n

\u3053\u308c\u3092\u3001\u5024(\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u5bb9)\u3067\u5224\u5b9a\u3055\u305b\u305f\u3044\u5834\u5408\u306f\u3069\u3046\u3059\u308b\u306e\u304b\u3068\u3044\u3046\u3068\u3001T\u578b\u306bIEquatable<T>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u30a4\u30f3\u30d7\u30ea\u30e1\u30f3\u30c8\u3057\u3066\u3001Equals\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u3066\u4e0a\u3052\u308c\u3070\u826f\u3044\u3002<\/p>\n\n\n\n

\/\/ \u30ce\u30fc\u30de\u30eb\u30d0\u30fc\u30b8\u30e7\u30f3\npublic class Person {\n\tpublic string Name { get; set; }\n\tpublic string Mail { get; set; }\n}\nvar p = new Person() { Name = "T.Sumomo", Mail = "t.sumomo@momo.com" };\nvar p1 = new Person() { Name = "T.Sumomo", Mail = "t.sumomo@momo.com" };\np == p1\np.Equals(p1)\nList<Person> l1 = new List<Person>() { p };\nl1.Contains(p1)\nl1.IndexOf(p1)\n\/\/ \u5024\u6bd4\u8f03\u30d0\u30fc\u30b8\u30e7\u30f3\npublic class Person1 : IEquatable<Person1> {\n\tpublic string Name { get; set; }\n\tpublic string Mail { get; set; }\n\t\/\/ \u5024\u3067\u6bd4\u8f03\n\tpublic bool Equals(Person1 other) {\n\t\treturn other?.Name == Name && other?.Mail == Mail;\n\t}\n}\nvar p2 = new Person1() { Name = "T.Sumomo", Mail = "t.sumomo@momo.com" };\nvar p3 = new Person1() { Name = "T.Sumomo", Mail = "t.sumomo@momo.com" };\np2 == p3\np2.Equals(p3)\nList<Person1> l2 = new List<Person1>() { p2 };\nl2.Contains(p3)\nl2.IndexOf(p3)<\/code><\/pre><\/div>\n\n\n\n
> p == p1\nfalse\n> p.Equals(p1)\nfalse\n> l1.Contains(p1)\nfalse\n> l1.IndexOf(p1)\n-1\n>\n> p2 == p3\nfalse\n> p2.Equals(p3)\ntrue\n> l2.Contains(p3)\ntrue\n> l2.IndexOf(p3)\n0<\/code><\/pre><\/div>\n\n\n\n
\u3068\u3001\u3053\u306e\u3088\u3046\u306b\u5024\u3067\u5224\u5b9a\u3092\u884c\u3046\u4e8b\u304c\u3067\u304d\u308b\u3002<\/p>\n\n\n\n
\u3082\u3061\u308d\u3093\u3001\u5185\u5bb9\u5168\u90e8\u3092\u6bd4\u8f03\u3059\u308b\u306e\u3067\u306f\u7121\u304f\u3001\u30ad\u30fc\u3068\u306a\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u3060\u3051\u306e\u6bd4\u8f03\u3068\u304b\u3067\u3082\u554f\u984c\u306f\u7121\u3044\u3002
\u3061\u306a\u307f\u306b\u3001Equals\u3067\u306f\u306a\u304f\u3001== operator\u3092Equals\u3068\u540c\u3058\u5185\u5bb9\u306b\u3057\u3066\u3082\u3001Contains\u3084IndexOf\u306f\u53c2\u7167\u5148\u306e\u6bd4\u8f03\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u3002<\/p>\n\n\n\n
\u307e\u3041\u3001\u308f\u3056\u308f\u3056\u30af\u30e9\u30b9\u306b\u624b\u3092\u5165\u308c\u306a\u3044\u3067\u3001LINQ\u4f7f\u3063\u3066\u3082\u3044\u3044\u306e\u3060\u3051\u3069\u30fb\u30fb\u30fb<\/p>\n","protected":false},"excerpt":{"rendered":"
List<T>\u306a\u3069\u3067T\u304c\u53c2\u7167\u578b\u306e\u5834\u5408\u3001Contains\u3084IndexO … \u7d9a\u304d\u3092\u8aad\u3080 →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18,9,4],"tags":[],"class_list":["post-648","post","type-post","status-publish","format-standard","hentry","category-net","category-c","category-4"],"_links":{"self":[{"href":"https:\/\/sumomo.ohwaki.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/648","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sumomo.ohwaki.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sumomo.ohwaki.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sumomo.ohwaki.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sumomo.ohwaki.jp\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=648"}],"version-history":[{"count":7,"href":"https:\/\/sumomo.ohwaki.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/648\/revisions"}],"predecessor-version":[{"id":655,"href":"https:\/\/sumomo.ohwaki.jp\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/648\/revisions\/655"}],"wp:attachment":[{"href":"https:\/\/sumomo.ohwaki.jp\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=648"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sumomo.ohwaki.jp\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=648"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sumomo.ohwaki.jp\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=648"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}