{"id":1614,"date":"2024-06-11T11:15:19","date_gmt":"2024-06-11T03:15:19","guid":{"rendered":"https:\/\/www.mustenaka.cn\/?p=1614"},"modified":"2024-06-11T11:16:59","modified_gmt":"2024-06-11T03:16:59","slug":"csharp_designerpattern_singletonpattern","status":"publish","type":"post","link":"https:\/\/www.mustenaka.cn\/index.php\/2024\/06\/11\/csharp_designerpattern_singletonpattern\/","title":{"rendered":"C# \u81ea\u7528\u8bbe\u8ba1\u6a21\u5f0f\u6a21\u7248 &#8211; \u5355\u4f8b\u6a21\u5f0f"},"content":{"rendered":"<p>C# \u81ea\u7528\u8bbe\u8ba1\u6a21\u5f0f\u6a21\u7248 \u2014 \u5355\u4f8b\u6a21\u5f0f<\/p>\n<pre class=\"pure-highlightjs\"><code class=\"\" cs=\"\">using System;\r\n\r\nnamespace SingletonPattern\r\n{\r\n    \/\/\/ &lt;summary&gt;\r\n    \/\/\/ \u5355\u4f8b\u6a21\u5f0f\u57fa\u7c7b\r\n    \/\/\/ &lt;\/summary&gt;\r\n    \/\/\/ &lt;typeparam name=\"T\"&gt;\u8981\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u7684\u7c7b\u7c7b\u578b&lt;\/typeparam&gt;\r\n    public abstract class SingletonBase&lt;T&gt; where T : SingletonBase&lt;T&gt;, new()\r\n    {\r\n        \/\/ \u7528\u4e8e\u5b58\u50a8\u5355\u4f8b\u5b9e\u4f8b\r\n        private static readonly Lazy&lt;T&gt; instance = new Lazy&lt;T&gt;(() =&gt; new T());\r\n\r\n        \/\/\/ &lt;summary&gt;\r\n        \/\/\/ \u83b7\u53d6\u5355\u4f8b\u5b9e\u4f8b\r\n        \/\/\/ &lt;\/summary&gt;\r\n        public static T Instance =&gt; instance.Value;\r\n\r\n        \/\/ \u4fdd\u62a4\u6784\u9020\u51fd\u6570\uff0c\u9632\u6b62\u5916\u90e8\u5b9e\u4f8b\u5316\r\n        protected SingletonBase()\r\n        {\r\n            if (instance.IsValueCreated)\r\n            {\r\n                throw new InvalidOperationException(\"\u4e0d\u80fd\u521b\u5efa\u5355\u4f8b\u7c7b\u7684\u53e6\u4e00\u4e2a\u5b9e\u4f8b\u3002\");\r\n            }\r\n        }\r\n\r\n        \/\/\/ &lt;summary&gt;\r\n        \/\/\/ \u521d\u59cb\u5316\u5355\u4f8b\u5b9e\u4f8b\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u7531\u6d3e\u751f\u7c7b\u91cd\u5199\r\n        \/\/\/ &lt;\/summary&gt;\r\n        protected virtual void Initialize()\r\n        {\r\n            \/\/ \u53ef\u7531\u6d3e\u751f\u7c7b\u5b9e\u73b0\r\n        }\r\n    }\r\n\r\n    \/\/\/ &lt;summary&gt;\r\n    \/\/\/ \u4e00\u4e2a\u5177\u4f53\u7684\u5355\u4f8b\u7c7b\u793a\u4f8b\r\n    \/\/\/ &lt;\/summary&gt;\r\n    public class MySingleton : SingletonBase&lt;MySingleton&gt;\r\n    {\r\n        \/\/ \u79c1\u6709\u6784\u9020\u51fd\u6570\r\n        private MySingleton()\r\n        {\r\n            \/\/ \u5728\u8fd9\u91cc\u53ef\u4ee5\u653e\u7f6e\u521d\u59cb\u5316\u4ee3\u7801\r\n        }\r\n\r\n        \/\/ \u53ef\u4ee5\u91cd\u5199\u521d\u59cb\u5316\u65b9\u6cd5\r\n        protected override void Initialize()\r\n        {\r\n            base.Initialize();\r\n            \/\/ \u5728\u8fd9\u91cc\u6dfb\u52a0\u5177\u4f53\u7684\u521d\u59cb\u5316\u903b\u8f91\r\n        }\r\n\r\n        \/\/ \u793a\u4f8b\u65b9\u6cd5\r\n        public void DoSomething()\r\n        {\r\n            Console.WriteLine(\"MySingleton is doing something.\");\r\n        }\r\n    }\r\n\r\n    class Program\r\n    {\r\n        static void Main(string[] args)\r\n        {\r\n            \/\/ \u83b7\u53d6\u5355\u4f8b\u5b9e\u4f8b\u5e76\u8c03\u7528\u5176\u65b9\u6cd5\r\n            MySingleton.Instance.DoSomething();\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u6a21\u677f\u8bf4\u660e\uff1a<\/p>\n<h4>SingletonBase&lt;T&gt; \u7c7b<\/h4>\n<p>\u6cdb\u578b\u57fa\u7c7b\uff0c\u7c7b\u578b\u53c2\u6570 T \u7ea6\u675f\u4e3a SingletonBase&lt;T&gt; \u7684\u5b50\u7c7b\uff0c\u5e76\u4e14\u5fc5\u987b\u5177\u6709\u4e00\u4e2a\u65e0\u53c2\u6570\u6784\u9020\u51fd\u6570\u3002<\/p>\n<ul>\n<li>Lazy&lt;T&gt; \u7528\u4e8e\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u5ef6\u8fdf\u521d\u59cb\u5316\u3002<\/li>\n<li>Instance \u5c5e\u6027\u63d0\u4f9b\u5bf9\u5355\u4f8b\u5b9e\u4f8b\u7684\u5168\u5c40\u8bbf\u95ee\u3002<\/li>\n<li>\u4fdd\u62a4\u7684\u6784\u9020\u51fd\u6570\u9632\u6b62\u5916\u90e8\u7c7b\u76f4\u63a5\u5b9e\u4f8b\u5316\u8be5\u7c7b\u3002<\/li>\n<li>Initialize \u65b9\u6cd5\u53ef\u4ee5\u7531\u6d3e\u751f\u7c7b\u91cd\u5199\u4ee5\u6267\u884c\u521d\u59cb\u5316\u903b\u8f91\u3002<\/li>\n<\/ul>\n<h2>Unity\u7248\u672c<\/h2>\n<pre class=\"pure-highlightjs\"><code class=\"\" cs=\"\">using System.Collections;\r\nusing System.Collections.Generic;\r\nusing UnityEngine;\r\n\r\npublic class MonoSingleton&lt;T&gt; : MonoBehaviour where T :  MonoBehaviour\r\n{\r\n    private static T instance;\r\n\r\n    public static T Instance\r\n    {\r\n        get\r\n        {\r\n            if(instance == null)\r\n            {\r\n                instance = FindObjectOfType&lt;T&gt;();\r\n                if (instance == null)\r\n                {\r\n                    Debug.LogError(\"\u6ca1\u6709\u5728\u573a\u666f\u4e2d\u627e\u5230\u8be5\u7c7b,\u8be5\u7c7b\u7684\u7c7b\u540d\u4e3a:\" + typeof(T).Name);\r\n                    return null;\r\n                }\r\n\r\n            }\r\n            return instance;\r\n        }\r\n    }\r\n\r\n    private void Awake()\r\n    {\r\n        if (instance == null)\r\n        {\r\n            DontDestroyOnLoad(gameObject);\r\n        }\r\n        else\r\n        {\r\n            Destroy(instance);\r\n        }\r\n            \r\n    }\r\n\r\n}\r\n\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>C# \u81ea\u7528\u8bbe\u8ba1\u6a21\u5f0f\u6a21\u7248 \u2014 \u5355\u4f8b\u6a21\u5f0f using System; namespace Singlet [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44],"tags":[],"class_list":["post-1614","post","type-post","status-publish","format-standard","hentry","category-csharp"],"views":1429,"_links":{"self":[{"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/posts\/1614","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1614"}],"version-history":[{"count":3,"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/posts\/1614\/revisions"}],"predecessor-version":[{"id":1617,"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/posts\/1614\/revisions\/1617"}],"wp:attachment":[{"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1614"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1614"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mustenaka.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}