{"id":1223,"date":"2025-01-25T23:19:44","date_gmt":"2025-01-25T15:19:44","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=1223"},"modified":"2025-01-25T23:19:45","modified_gmt":"2025-01-25T15:19:45","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-net-%e4%b8%ad%e5%8f%af%e9%9d%a0%e4%b8%94%e9%ab%98%e6%95%88%e5%9c%b0%e9%aa%8c%e8%af%81-internet-%e8%bf%9e%e6%8e%a5%ef%bc%9a%e5%ae%8c%e6%95%b4%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/01\/25\/%e5%a6%82%e4%bd%95%e5%9c%a8-net-%e4%b8%ad%e5%8f%af%e9%9d%a0%e4%b8%94%e9%ab%98%e6%95%88%e5%9c%b0%e9%aa%8c%e8%af%81-internet-%e8%bf%9e%e6%8e%a5%ef%bc%9a%e5%ae%8c%e6%95%b4%e6%8c%87%e5%8d%97\/","title":{"rendered":"\u5982\u4f55\u5728 .NET \u4e2d\u53ef\u9760\u4e14\u9ad8\u6548\u5730\u9a8c\u8bc1 Internet \u8fde\u63a5\uff1a\u5b8c\u6574\u6307\u5357"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5728 .NET \u5f00\u53d1\u4e2d\uff0c\u9a8c\u8bc1 Internet \u8fde\u63a5\u7684\u53ef\u9760\u6027\u4e0e\u6548\u7387\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u95ee\u9898\uff0c\u5c24\u5176\u662f\u5728\u9700\u8981\u8fdb\u884c\u5916\u90e8 API \u8c03\u7528\u6216\u4f9d\u8d56\u4e92\u8054\u7f51\u7684\u5e94\u7528\u7a0b\u5e8f\u4e2d\u3002\u6b63\u786e\u7684\u9a8c\u8bc1\u65b9\u6cd5\u53ef\u4ee5\u5e2e\u52a9\u7a0b\u5e8f\u5728\u8fde\u63a5\u4e0d\u53ef\u7528\u65f6\u505a\u51fa\u54cd\u5e94\u5e76\u63d0\u9ad8\u7528\u6237\u4f53\u9a8c\u3002\u4ee5\u4e0b\u662f\u51e0\u79cd\u6709\u6548\u4e14\u53ef\u9760\u7684\u65b9\u6cd5\uff0c\u7528\u4e8e\u9a8c\u8bc1 Internet \u8fde\u63a5\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u4f7f\u7528 <code>System.Net.NetworkInformation<\/code> \u7c7b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>NetworkInformation<\/code> \u7c7b\u63d0\u4f9b\u4e86\u5bf9\u7f51\u7edc\u63a5\u53e3\u548c\u8fde\u63a5\u72b6\u6001\u7684\u8bbf\u95ee\uff0c\u53ef\u4ee5\u7528\u6765\u9a8c\u8bc1\u8ba1\u7b97\u673a\u662f\u5426\u8fde\u63a5\u5230\u7f51\u7edc\u3002\u901a\u8fc7\u68c0\u6d4b\u9ed8\u8ba4\u7f51\u5173\u662f\u5426\u53ef\u8fbe\uff0c\u6216\u8005\u68c0\u67e5\u67d0\u4e2a\u7279\u5b9a\u57df\u540d\u7684\u8fde\u63a5\u60c5\u51b5\uff0c\u53ef\u4ee5\u5224\u65ad\u7f51\u7edc\u662f\u5426\u53ef\u7528\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>using System;\nusing System.Net.NetworkInformation;\n\nclass Program\n{\n    static void Main()\n    {\n        if (IsInternetAvailable())\n        {\n            Console.WriteLine(\"Internet is available.\");\n        }\n        else\n        {\n            Console.WriteLine(\"Internet is not available.\");\n        }\n    }\n\n    static bool IsInternetAvailable()\n    {\n        try\n        {\n            \/\/ \u83b7\u53d6\u9ed8\u8ba4\u7f51\u5173\n            var ping = new Ping();\n            var reply = ping.Send(\"8.8.8.8\", 1000); \/\/ \u4f7f\u7528 Google \u7684\u516c\u5171 DNS \u5730\u5740\u8fdb\u884c ping \u6d4b\u8bd5\n            return reply.Status == IPStatus.Success;\n        }\n        catch\n        {\n            return false;\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u91ca\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Ping.Send<\/code> \u65b9\u6cd5\u5c1d\u8bd5\u4e0e Google \u7684\u516c\u5171 DNS \u5730\u5740\uff08<code>8.8.8.8<\/code>\uff09\u8fdb\u884c\u901a\u4fe1\uff0c\u82e5\u8fde\u63a5\u6210\u529f\uff0c\u5219\u8868\u660e\u8ba1\u7b97\u673a\u5df2\u8fde\u63a5\u5230\u4e92\u8054\u7f51\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u65e0\u6cd5\u8fdb\u884c Ping \u6d4b\u8bd5\uff0c\u901a\u5e38\u610f\u5473\u7740\u6ca1\u6709\u6709\u6548\u7684\u4e92\u8054\u7f51\u8fde\u63a5\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u4f18\u70b9\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7b80\u5355\u4e14\u6613\u4e8e\u5b9e\u73b0\u3002<\/li>\n\n\n\n<li>\u65e0\u9700\u8bbf\u95ee\u5916\u90e8\u7f51\u7ad9\uff0c\u9002\u5408\u5feb\u901f\u9a8c\u8bc1\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u7f3a\u70b9\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Ping<\/code> \u6d4b\u8bd5\u53ef\u80fd\u4f1a\u53d7\u5230\u9632\u706b\u5899\u7684\u963b\u62e6\uff0c\u67d0\u4e9b\u73af\u5883\u4e2d\u53ef\u80fd\u9700\u8981\u989d\u5916\u7684\u914d\u7f6e\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u4f7f\u7528 <code>HttpClient<\/code> \u8fdb\u884c\u5916\u90e8\u8fde\u63a5\u6d4b\u8bd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u901a\u8fc7\u5c1d\u8bd5\u8bbf\u95ee\u4e00\u4e2a\u53ef\u9760\u7684\u5916\u90e8\u670d\u52a1\u5668\uff08\u4f8b\u5982\u516c\u5171\u7684 HTTP \u670d\u52a1\uff09\uff0c\u4ee5\u786e\u8ba4\u662f\u5426\u53ef\u4ee5\u901a\u8fc7 HTTP \u534f\u8bae\u8fde\u63a5\u5230\u4e92\u8054\u7f51\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>using System;\nusing System.Net.Http;\nusing System.Threading.Tasks;\n\nclass Program\n{\n    static async Task Main()\n    {\n        if (await IsInternetAvailable())\n        {\n            Console.WriteLine(\"Internet is available.\");\n        }\n        else\n        {\n            Console.WriteLine(\"Internet is not available.\");\n        }\n    }\n\n    static async Task&lt;bool&gt; IsInternetAvailable()\n    {\n        try\n        {\n            using (var client = new HttpClient())\n            {\n                client.Timeout = TimeSpan.FromSeconds(5);\n                var response = await client.GetAsync(\"https:\/\/www.google.com\");\n                return response.IsSuccessStatusCode;\n            }\n        }\n        catch\n        {\n            return false;\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u91ca\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>HttpClient.GetAsync<\/code> \u65b9\u6cd5\u5c1d\u8bd5\u8fde\u63a5\u5230 Google \u7f51\u7ad9\uff08\u6216\u5176\u4ed6\u53ef\u9760\u7684\u7f51\u7ad9\uff09\uff0c\u5982\u679c\u54cd\u5e94\u6210\u529f\uff0c\u8868\u793a\u7f51\u7edc\u8fde\u63a5\u6b63\u5e38\u3002<\/li>\n\n\n\n<li>\u8bbe\u7f6e\u4e00\u4e2a\u8f83\u77ed\u7684\u8d85\u65f6\u65f6\u95f4\uff08\u5982 5 \u79d2\uff09\u53ef\u4ee5\u907f\u514d\u957f\u65f6\u95f4\u7684\u7b49\u5f85\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u4f18\u70b9\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528 HTTP \u8bf7\u6c42\uff0c\u9002\u5408\u9a8c\u8bc1 Internet \u8fde\u63a5\u662f\u5426\u80fd\u591f\u8fdb\u884c\u6b63\u5e38\u7684 Web \u8bf7\u6c42\u3002<\/li>\n\n\n\n<li>\u80fd\u591f\u5904\u7406\u5404\u79cd\u4e92\u8054\u7f51\u8fde\u63a5\u95ee\u9898\uff0c\u5305\u62ec DNS \u914d\u7f6e\u3001\u4ee3\u7406\u670d\u52a1\u5668\u7b49\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u7f3a\u70b9\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9700\u8981\u4f7f\u7528\u5916\u90e8\u670d\u52a1\u5668\u8fdb\u884c\u6d4b\u8bd5\uff0c\u56e0\u6b64\u53d7\u670d\u52a1\u5668\u53ef\u7528\u6027\u5f71\u54cd\u3002<\/li>\n\n\n\n<li>\u53ef\u80fd\u5f15\u5165\u989d\u5916\u7684\u7f51\u7edc\u5ef6\u8fdf\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u4f7f\u7528 <code>Dns.GetHostEntry<\/code> \u9a8c\u8bc1 DNS \u89e3\u6790<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u5c1d\u8bd5\u89e3\u6790\u4e00\u4e2a\u5e38\u89c1\u7684\u57df\u540d\uff08\u5982 <code>google.com<\/code>\uff09\uff0c\u53ef\u4ee5\u9a8c\u8bc1 DNS \u670d\u52a1\u662f\u5426\u6b63\u5e38\u5de5\u4f5c\uff0c\u95f4\u63a5\u5224\u65ad\u7f51\u7edc\u8fde\u63a5\u72b6\u6001\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>using System;\nusing System.Net;\n\nclass Program\n{\n    static void Main()\n    {\n        if (IsInternetAvailable())\n        {\n            Console.WriteLine(\"Internet is available.\");\n        }\n        else\n        {\n            Console.WriteLine(\"Internet is not available.\");\n        }\n    }\n\n    static bool IsInternetAvailable()\n    {\n        try\n        {\n            \/\/ \u5c1d\u8bd5\u89e3\u6790 Google \u7684\u57df\u540d\n            var hostEntry = Dns.GetHostEntry(\"google.com\");\n            return hostEntry != null;\n        }\n        catch\n        {\n            return false;\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u91ca\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Dns.GetHostEntry<\/code> \u4f1a\u89e3\u6790\u7ed9\u5b9a\u57df\u540d\u7684 IP \u5730\u5740\uff0c\u5982\u679c\u89e3\u6790\u6210\u529f\uff0c\u8868\u793a\u8ba1\u7b97\u673a\u80fd\u591f\u8bbf\u95ee\u4e92\u8054\u7f51\u5e76\u8fdb\u884c DNS \u67e5\u8be2\u3002<\/li>\n\n\n\n<li>\u5982\u679c DNS \u67e5\u8be2\u5931\u8d25\uff0c\u901a\u5e38\u8868\u793a\u6ca1\u6709\u6709\u6548\u7684\u7f51\u7edc\u8fde\u63a5\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u4f18\u70b9\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e0d\u9700\u8981\u8fdb\u884c\u5916\u90e8 HTTP \u8bf7\u6c42\uff0c\u9a8c\u8bc1\u8fc7\u7a0b\u7b80\u6d01\u3002<\/li>\n\n\n\n<li>\u80fd\u591f\u95f4\u63a5\u68c0\u6d4b DNS \u914d\u7f6e\u548c\u8fde\u63a5\u95ee\u9898\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u7f3a\u70b9\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u65e0\u6cd5\u68c0\u6d4b\u5230\u6ca1\u6709\u8fdb\u884c DNS \u67e5\u8be2\u4f46\u4ecd\u80fd\u8bbf\u95ee\u7279\u5b9a IP \u7684\u8fde\u63a5\uff08\u4f8b\u5982\u4ee3\u7406\u670d\u52a1\u5668\u6216\u5185\u7f51\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u7efc\u5408\u5224\u65ad\uff1a\u4f7f\u7528\u591a\u4e2a\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4e86\u63d0\u9ad8\u9a8c\u8bc1\u7684\u51c6\u786e\u6027\uff0c\u53ef\u4ee5\u5c06\u591a\u79cd\u65b9\u6cd5\u7ed3\u5408\u8d77\u6765\u3002\u4f8b\u5982\uff0c\u5148\u4f7f\u7528 <code>Ping<\/code> \u6d4b\u8bd5\u786e\u8ba4\u7f51\u7edc\u8fde\u63a5\uff0c\u518d\u7528 <code>HttpClient<\/code> \u68c0\u67e5\u5916\u90e8\u8fde\u63a5\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>using System;\nusing System.Net.NetworkInformation;\nusing System.Net.Http;\nusing System.Threading.Tasks;\n\nclass Program\n{\n    static async Task Main()\n    {\n        if (await IsInternetAvailable())\n        {\n            Console.WriteLine(\"Internet is available.\");\n        }\n        else\n        {\n            Console.WriteLine(\"Internet is not available.\");\n        }\n    }\n\n    static async Task&lt;bool&gt; IsInternetAvailable()\n    {\n        \/\/ \u5148\u4f7f\u7528 Ping \u6d4b\u8bd5\n        if (PingTest())\n        {\n            return true;\n        }\n\n        \/\/ \u5982\u679c Ping \u5931\u8d25\uff0c\u4f7f\u7528 HttpClient \u8fdb\u884c HTTP \u6d4b\u8bd5\n        return await HttpClientTest();\n    }\n\n    static bool PingTest()\n    {\n        try\n        {\n            var ping = new Ping();\n            var reply = ping.Send(\"8.8.8.8\", 1000);\n            return reply.Status == IPStatus.Success;\n        }\n        catch\n        {\n            return false;\n        }\n    }\n\n    static async Task&lt;bool&gt; HttpClientTest()\n    {\n        try\n        {\n            using (var client = new HttpClient())\n            {\n                client.Timeout = TimeSpan.FromSeconds(5);\n                var response = await client.GetAsync(\"https:\/\/www.google.com\");\n                return response.IsSuccessStatusCode;\n            }\n        }\n        catch\n        {\n            return false;\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u91ca\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9996\u5148\u4f7f\u7528 <code>PingTest<\/code> \u65b9\u6cd5\u6d4b\u8bd5\u7f51\u7edc\u8fde\u63a5\uff0c\u5982\u679c\u6210\u529f\u5219\u8ba4\u4e3a\u7f51\u7edc\u53ef\u7528\u3002<\/li>\n\n\n\n<li>\u5982\u679c <code>Ping<\/code> \u6d4b\u8bd5\u5931\u8d25\uff0c\u5219\u7ee7\u7eed\u4f7f\u7528 <code>HttpClientTest<\/code> \u65b9\u6cd5\u6d4b\u8bd5\u4e92\u8054\u7f51\u8fde\u63a5\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u4f18\u70b9\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7ed3\u5408\u4e86\u591a\u79cd\u65b9\u6cd5\uff0c\u63d0\u9ad8\u4e86\u68c0\u6d4b\u51c6\u786e\u6027\u3002<\/li>\n\n\n\n<li>\u5373\u4f7f\u67d0\u4e2a\u65b9\u6cd5\u53d7\u5230\u73af\u5883\u9650\u5236\uff08\u5982\u9632\u706b\u5899\uff09\u4e5f\u80fd\u589e\u52a0\u6210\u529f\u7684\u6982\u7387\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u7f3a\u70b9\uff1a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9700\u8981\u6267\u884c\u591a\u4e2a\u68c0\u67e5\uff0c\u53ef\u80fd\u7a0d\u5fae\u589e\u52a0\u5ef6\u8fdf\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u603b\u7ed3\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ping \u6d4b\u8bd5<\/strong>\uff1a\u7b80\u5355\u4e14\u5feb\u901f\uff0c\u9002\u5408\u68c0\u6d4b\u662f\u5426\u80fd\u4e0e\u7f51\u7edc\u4e2d\u7684\u7f51\u5173\u901a\u4fe1\uff0c\u4f46\u53ef\u80fd\u53d7\u9632\u706b\u5899\u9650\u5236\u3002<\/li>\n\n\n\n<li><strong>HTTP \u8bf7\u6c42<\/strong>\uff1a\u901a\u8fc7\u8bbf\u95ee\u5916\u90e8\u670d\u52a1\u5668\u9a8c\u8bc1\u7f51\u7edc\u8fde\u63a5\u7684\u53ef\u7528\u6027\uff0c\u9002\u5408\u9a8c\u8bc1\u4e92\u8054\u7f51\u8fde\u63a5\u3002<\/li>\n\n\n\n<li><strong>DNS \u89e3\u6790<\/strong>\uff1a\u9002\u7528\u4e8e\u68c0\u6d4b DNS \u914d\u7f6e\u548c\u7f51\u7edc\u8fde\u63a5\uff0c\u6bd4\u8f83\u8f7b\u91cf\u3002<\/li>\n\n\n\n<li><strong>\u7efc\u5408\u65b9\u6cd5<\/strong>\uff1a\u7ed3\u5408\u591a\u4e2a\u65b9\u6cd5\u63d0\u4f9b\u66f4\u53ef\u9760\u7684\u7ed3\u679c\uff0c\u9002\u5408\u590d\u6742\u7684\u7f51\u7edc\u73af\u5883\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 .NET \u5f00\u53d1\u4e2d\uff0c\u9a8c\u8bc1 Internet \u8fde\u63a5\u7684\u53ef\u9760\u6027\u4e0e\u6548\u7387\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u95ee\u9898\uff0c\u5c24\u5176\u662f\u5728\u9700\u8981\u8fdb\u884c\u5916\u90e8 API [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59],"tags":[],"class_list":["post-1223","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1223","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=1223"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1223\/revisions"}],"predecessor-version":[{"id":1224,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1223\/revisions\/1224"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=1223"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=1223"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=1223"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}