{"id":3553,"date":"2025-04-19T09:55:45","date_gmt":"2025-04-19T01:55:45","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3553"},"modified":"2025-04-19T09:55:45","modified_gmt":"2025-04-19T01:55:45","slug":"%e5%8f%8d%e5%b0%84%ef%bc%88reflection%ef%bc%89-vs-%e5%8a%a8%e6%80%81%ef%bc%88dynamic%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/04\/19\/%e5%8f%8d%e5%b0%84%ef%bc%88reflection%ef%bc%89-vs-%e5%8a%a8%e6%80%81%ef%bc%88dynamic%ef%bc%89\/","title":{"rendered":"\u53cd\u5c04\uff08Reflection\uff09 vs  \u52a8\u6001\uff08dynamic\uff09"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">1. \u53cd\u5c04 vs \u52a8\u6001<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 \u6982\u5ff5\u533a\u522b\uff1a<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u9879\u76ee<\/th><th>\u53cd\u5c04\uff08Reflection\uff09<\/th><th><code>dynamic<\/code><\/th><\/tr><\/thead><tbody><tr><td>\u7c7b\u578b\u68c0\u67e5<\/td><td>\u7f16\u8bd1\u65f6\u5df2\u77e5\uff08\u9759\u6001\u7c7b\u578b\uff09<\/td><td>\u7f16\u8bd1\u65f6\u672a\u77e5\uff0c\u8fd0\u884c\u65f6\u51b3\u5b9a<\/td><\/tr><tr><td>\u6210\u5458\u8c03\u7528<\/td><td>\u9700\u4f7f\u7528 <code>MethodInfo<\/code> \u7b49<\/td><td>\u76f4\u63a5\u4f7f\u7528\u5bf9\u8c61\u6210\u5458\u8bed\u6cd5<\/td><\/tr><tr><td>\u8bed\u6cd5\u590d\u6742\u5ea6<\/td><td>\u8f83\u9ad8\uff0c\u9700\u4e86\u89e3 API<\/td><td>\u66f4\u81ea\u7136\uff0c\u6613\u4e66\u5199<\/td><\/tr><tr><td>\u6027\u80fd<\/td><td>\u6162\uff08\u5143\u6570\u636e\u89e3\u6790\uff09<\/td><td>\u6162\uff08\u52a8\u6001\u8c03\u5ea6\uff09<\/td><\/tr><tr><td>\u5e94\u7528\u573a\u666f<\/td><td>\u6846\u67b6\u3001\u5143\u6570\u636e\u64cd\u4f5c<\/td><td>COM \u4e92\u64cd\u4f5c\u3001ExpandoObject\u3001\u7b80\u5355\u52a8\u6001\u8c03\u7528<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 \u793a\u4f8b\uff1a<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u53cd\u5c04\u65b9\u5f0f\u8c03\u7528\u65b9\u6cd5\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>var method = typeof(Person).GetMethod(\"SayHello\");\nmethod.Invoke(personObj, null);<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">dynamic \u65b9\u5f0f\u8c03\u7528\u65b9\u6cd5\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>dynamic obj = personObj;\nobj.SayHello(); \/\/ \u7f16\u8bd1\u65f6\u4e0d\u68c0\u67e5<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 \u5173\u952e\u70b9\u603b\u7ed3\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>dynamic<\/code> \u4f7f\u7528\u7b80\u5355\uff0c\u9002\u5408\u903b\u8f91\u4e0d\u590d\u6742\u7684\u573a\u666f<\/li>\n\n\n\n<li><code>Reflection<\/code> \u529f\u80fd\u5f3a\u5927\uff0c\u9002\u5408\u5199\u6846\u67b6\u3001\u6df1\u5165\u64cd\u4f5c\u5143\u6570\u636e<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. \u5982\u4f55\u4f18\u5316\u53cd\u5c04\u6027\u80fd\uff1f<\/h2>\n\n\n\n<p>\u53cd\u5c04\u6027\u80fd\u5dee\u7684\u6838\u5fc3\u539f\u56e0\u662f <strong>\u9891\u7e41\u4f7f\u7528\u5143\u6570\u636e\u89e3\u6790\uff08\u5982 <code>GetMethod()<\/code>\uff09\u548c\u8fd0\u884c\u65f6\u8c03\u5ea6\uff08\u5982 <code>Invoke()<\/code>\uff09<\/strong>\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 \u4f18\u5316\u6280\u5de7\uff1a<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u2460 \u7f13\u5b58\u53cd\u5c04\u4fe1\u606f\uff08Type\u3001MethodInfo\uff09<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>private static Dictionary&lt;string, MethodInfo&gt; _cache = new();\n\nMethodInfo method = _cache.GetOrAdd(\"Person.SayHello\", () =&gt;\n    typeof(Person).GetMethod(\"SayHello\"));<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u2461 \u4f7f\u7528\u59d4\u6258\u66ff\u4ee3 <code>Invoke()<\/code><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>var method = typeof(Person).GetMethod(\"SayHello\");\nvar del = (Action&lt;Person&gt;)Delegate.CreateDelegate(typeof(Action&lt;Person&gt;), null, method);\ndel(new Person());<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u2462 \u4f7f\u7528\u8868\u8fbe\u5f0f\u6811\uff08Expression Tree\uff09<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>ParameterExpression param = Expression.Parameter(typeof(Person), \"p\");\nMethodCallExpression call = Expression.Call(param, \"SayHello\", null);\nvar lambda = Expression.Lambda&lt;Action&lt;Person&gt;&gt;(call, param).Compile();\nlambda(new Person());<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u6027\u80fd\u5bf9\u6bd4\uff08\u5927\u81f4\uff09\uff1a<br>\u666e\u901a\u65b9\u6cd5\u8c03\u7528 \u226b \u59d4\u6258 \u226b \u8868\u8fbe\u5f0f\u6811 \u226b \u53cd\u5c04 <code>Invoke<\/code><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. \u53cd\u5c04\u7ed3\u5408 Attribute \u6784\u5efa\u6570\u636e\u9a8c\u8bc1\u5668<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 \u573a\u666f\uff1a\u4f60\u4e3a\u5b9e\u4f53\u7c7b\u52a0\u4e0a Attribute\uff0c\u7136\u540e\u901a\u8fc7\u53cd\u5c04\u8bfb\u53d6\u8fd9\u4e9b\u7279\u6027\u8fdb\u884c\u6570\u636e\u6821\u9a8c\u3002<\/h3>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u793a\u4f8b\uff1a\u5b9a\u4e49\u9a8c\u8bc1\u7279\u6027<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;AttributeUsage(AttributeTargets.Property)]\npublic class RequiredAttribute : Attribute\n{\n    public string ErrorMessage { get; set; } = \"\u4e0d\u80fd\u4e3a\u7a7a\";\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u793a\u4f8b\uff1a\u5b9e\u4f53\u7c7b<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>public class User\n{\n    &#91;Required(ErrorMessage = \"\u7528\u6237\u540d\u4e0d\u80fd\u4e3a\u7a7a\")]\n    public string Username { get; set; }\n\n    public int Age { get; set; }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u793a\u4f8b\uff1a\u53cd\u5c04\u8bfb\u53d6\u9a8c\u8bc1\u903b\u8f91<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Validator\n{\n    public static List&lt;string&gt; Validate(object obj)\n    {\n        List&lt;string&gt; errors = new();\n        var props = obj.GetType().GetProperties();\n        foreach (var prop in props)\n        {\n            var attr = prop.GetCustomAttribute&lt;RequiredAttribute&gt;();\n            if (attr != null)\n            {\n                var value = prop.GetValue(obj);\n                if (value == null || string.IsNullOrWhiteSpace(value.ToString()))\n                    errors.Add(attr.ErrorMessage);\n            }\n        }\n        return errors;\n    }\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f7f\u7528\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>var user = new User();\nvar errors = Validator.Validate(user);\nforeach (var error in errors)\n    Console.WriteLine(error);<\/code><\/pre>\n\n\n\n<p>\ud83d\udccc \u8fd9\u4e2a\u601d\u8def\u53ef\u7528\u4e8e\u6784\u5efa\u81ea\u5b9a\u4e49\u8868\u5355\u9a8c\u8bc1\u5668\u3001DTO \u68c0\u67e5\u5668\u7b49\u6846\u67b6\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. \u4f7f\u7528 Assembly.Load \u5b9e\u73b0\u63d2\u4ef6\u673a\u5236<\/h2>\n\n\n\n<p>\u53cd\u5c04\u7684\u9ad8\u7ea7\u5e94\u7528 \u2014\u2014 \u52a8\u6001\u52a0\u8f7d DLL \u5e76\u8c03\u7528\u7c7b\u548c\u65b9\u6cd5\uff0c\u6784\u5efa\u201c\u63d2\u4ef6\u7cfb\u7edf\u201d\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 \u6b65\u9aa4 1\uff1a\u5b9a\u4e49\u63d2\u4ef6\u63a5\u53e3<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>public interface IPlugin\n{\n    string Name { get; }\n    void Run();\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 \u6b65\u9aa4 2\uff1a\u7f16\u5199\u63d2\u4ef6 DLL \u5de5\u7a0b\uff08\u5982 <code>MyPlugin.dll<\/code>\uff09<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>public class HelloPlugin : IPlugin\n{\n    public string Name =&gt; \"Hello Plugin\";\n\n    public void Run() =&gt; Console.WriteLine(\"Hello from plugin!\");\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 \u6b65\u9aa4 3\uff1a\u4e3b\u7a0b\u5e8f\u4e2d\u52a8\u6001\u52a0\u8f7d DLL<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>string pluginPath = \"MyPlugin.dll\";\nAssembly asm = Assembly.LoadFrom(pluginPath);\n\nvar pluginTypes = asm.GetTypes()\n    .Where(t =&gt; typeof(IPlugin).IsAssignableFrom(t) &amp;&amp; !t.IsInterface);\n\nforeach (var type in pluginTypes)\n{\n    var plugin = (IPlugin)Activator.CreateInstance(type);\n    Console.WriteLine($\"&#91;\u52a0\u8f7d\u63d2\u4ef6] {plugin.Name}\");\n    plugin.Run();\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 \u5e94\u7528\u573a\u666f\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u811a\u672c\u6269\u5c55\u673a\u5236\uff08\u5982\u6e38\u620f\u6a21\u7ec4\u3001IDE \u63d2\u4ef6\uff09<\/li>\n\n\n\n<li>\u4f01\u4e1a\u7ea7\u4e1a\u52a1\u7ec4\u4ef6\u70ed\u63d2\u62d4<\/li>\n\n\n\n<li>\u6846\u67b6\u7ea7\u522b\u7684\u52a8\u6001\u6269\u5c55\uff08\u7c7b\u4f3c ASP.NET Core \u7684\u4e2d\u95f4\u4ef6\uff09<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u6743\u5a01\u8d44\u6599\u53c2\u8003<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udcd8 <a href=\"https:\/\/learn.microsoft.com\/zh-cn\/dotnet\/csharp\/language-reference\/keywords\/dynamic\">C# dynamic \u5173\u952e\u5b57\u5b98\u65b9\u6587\u6863<\/a><\/li>\n\n\n\n<li>\ud83d\udcd8 <a href=\"https:\/\/learn.microsoft.com\/zh-cn\/dotnet\/api\/system.linq.expressions.expression\">.NET \u59d4\u6258\u4e0e\u8868\u8fbe\u5f0f\u6811\u4f18\u5316<\/a><\/li>\n\n\n\n<li>\ud83d\udcd8 <a href=\"https:\/\/learn.microsoft.com\/zh-cn\/dotnet\/standard\/assembly\/reflection\">\u5982\u4f55\u4f7f\u7528\u53cd\u5c04\u5b9e\u73b0\u63d2\u4ef6\u673a\u5236<\/a><\/li>\n\n\n\n<li>\ud83d\udcd8 <a href=\"https:\/\/learn.microsoft.com\/zh-cn\/dotnet\/standard\/attributes\/writing-custom-attributes\">.NET \u81ea\u5b9a\u4e49 Attribute \u6559\u7a0b<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u603b\u7ed3\uff1a\u4e00\u53e5\u8bdd\u6838\u5fc3\u8bb0\u5fc6<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>dynamic<\/code> \u7528\u4e8e<strong>\u52a8\u6001\u7c7b\u578b\u7684\u7b80\u5355\u8c03\u7528<\/strong><\/li>\n\n\n\n<li><code>Reflection<\/code> \u662f\u6784\u5efa\u6846\u67b6\/\u63d2\u4ef6\/\u5143\u6570\u636e\u64cd\u4f5c\u7684<strong>\u5fc5\u5907\u5229\u5668<\/strong><\/li>\n\n\n\n<li>\u6027\u80fd\u5173\u952e\u5728\u4e8e<strong>\u7f13\u5b58<\/strong>\u4e0e<strong>\u59d4\u6258\u66ff\u4ee3<\/strong><\/li>\n\n\n\n<li>\u7279\u6027 + \u53cd\u5c04 = \u6784\u5efa\u201c\u53ef\u914d\u7f6e\u3001\u53ef\u6269\u5c55\u201d\u7684\u4e1a\u52a1\u903b\u8f91\u57fa\u77f3<\/li>\n\n\n\n<li><code>Assembly.Load<\/code> \u662f\u5b9e\u73b0<strong>\u677e\u8026\u5408\u63d2\u4ef6\u5316\u67b6\u6784<\/strong>\u7684\u5165\u53e3<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. \u53cd\u5c04 vs \u52a8\u6001 \u2705 \u6982\u5ff5\u533a\u522b\uff1a \u9879\u76ee \u53cd\u5c04\uff08Reflection\uff09 dynamic \u7c7b\u578b\u68c0\u67e5 \u7f16\u8bd1\u65f6\u5df2 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3554,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[83],"tags":[],"class_list":["post-3553","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3553","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3553"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3553\/revisions"}],"predecessor-version":[{"id":3555,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3553\/revisions\/3555"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3554"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3553"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3553"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3553"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}