{"id":790,"date":"2021-09-08T11:24:11","date_gmt":"2021-09-08T03:24:11","guid":{"rendered":"http:\/\/www.wayln.com\/?p=790"},"modified":"2021-09-08T11:24:11","modified_gmt":"2021-09-08T03:24:11","slug":"%e5%bc%82%e6%ad%a5%e7%bc%96%e7%a8%8b%e5%9f%ba%e7%a1%80-%e7%ad%89%e5%be%85%e4%bb%bb%e6%84%8f%e4%bb%bb%e5%8a%a1%e5%ae%8c%e6%88%90","status":"publish","type":"post","link":"https:\/\/www.wayln.com\/?p=790","title":{"rendered":"\u5f02\u6b65\u7f16\u7a0b\u57fa\u7840\u2014\u2014\u7b49\u5f85\u4efb\u610f\u4efb\u52a1\u5b8c\u6210"},"content":{"rendered":"<div id=\"toc_container\" class=\"toc_transparent no_bullets\"><p class=\"toc_title\">Contents<\/p><ul class=\"toc_list\"><li><a href=\"#i\"><span class=\"toc_number toc_depth_1\">1<\/span> \u95ee\u9898<\/a><\/li><li><a href=\"#i-2\"><span class=\"toc_number toc_depth_1\">2<\/span> \u89e3\u51b3\u65b9\u6848<\/a><\/li><li><a href=\"#i-3\"><span class=\"toc_number toc_depth_1\">3<\/span> \u8ba8\u8bba<\/a><\/li><\/ul><\/div>\n<h1><span id=\"i\">\u95ee\u9898<\/span><\/h1>\n<p>\u5047\u8bbe\u624b\u5934\u6709\u82e5\u5e72\u9879\u4efb\u52a1\uff0c\u9700\u8981\u54cd\u5e94\u5176\u4e2d\u5b8c\u6210\u7684\u90a3\u4e00\u9879\u3002\u6bd4\u5982\u540c\u4e8b\u4ece\u591a\u4e2aWeb\u670d\u52a1\u8bf7\u6c42\u80a1\u7968\u884c\u60c5\u4fe1\u606f\uff0c\u4f46\u662f\u4e4b\u5173\u7cfb\u7b2c\u4e00\u4e2a\u505a\u51fa\u54cd\u5e94\u7684\u670d\u52a1<\/p>\n<h1><span id=\"i-2\">\u89e3\u51b3\u65b9\u6848<\/span><\/h1>\n<p>\u4f7f\u7528Task.WhenAny\u65b9\u6cd5\u3002Task.WhenAny\u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u4efb\u52a1\u5e8f\u5217\uff0c\u5f53\u4efb\u610f\u4efb\u52a1\u5b8c\u6210\u65f6\uff0c\u4ed6\u5c31\u4f1a\u8fd4\u56de\u5df2\u5b8c\u6210\u7684\u4efb\u52a1\uff0c\u8fd9\u65f6\u8fd4\u56de\u7ed3\u679c\u4fbf\u662f\u5df2\u7ecf\u5b8c\u6210\u7684\u4efb\u52a1\u3002<\/p>\n<pre><code class=\"language-CSharp line-numbers\">\/\/\u5bf9\u4e8e\u7b2c\u4e00\u4e2a\u8981\u54cd\u5e94\u7684URL\uff0c\u5c06\u5176\u6570\u636e\u957f\u5ea6\u8fd4\u56de\nasync Task&lt;int&gt; FirstRespondingUrlAsync(HttpClient client,string urlA,string urlB)\n{\n    \/\/\u540c\u65f6\u5f00\u59cb\u4e24\u4e2a\u4e0b\u8f7d\u4efb\u52a1\n    Task&lt;byte[]&gt;downloadTaskA=client.GetByteArrayAsync(urlA);\n    Task&lt;byte[]&gt;downloadTaskB=client.GetByteArrayAsync(urlB);\n    \/\/\u7b49\u5f85\u4e24\u4e2a\u4efb\u52a1\u91cd\u7684\u4efb\u610f\u4e00\u4e2a\u5b8c\u6210\n    Task&lt;byte[]&gt;completedTask=await Task.WhenAny(downloadTaskA,downloadTaskB);\n    \/\/\u8fd4\u56de\u4eceURL\u4e2d\u83b7\u53d6\u7684\u6570\u636e\u957f\u5ea6\n    byte[] data=await completedTask;\n    return data.Length;\n}\n<\/code><\/pre>\n<h1><span id=\"i-3\">\u8ba8\u8bba<\/span><\/h1>\n<p>Task.WhenAny\u8fd4\u56de\u7684\u4efb\u52a1\u4ece\u4e0d\u4f1a\u4ee5\u9519\u8bef\u72b6\u6001\u6216\u53d6\u6d88\u72b6\u6001\u5b8c\u6210\uff0c\u8fd9\u79cd&#8221;\u5916\u90e8&#8221;\u4efb\u52a1\u603b\u4f1a\u6210\u529f\u5b8c\u6210\uff0c\u800c\u5b83\u7684\u8fd4\u56de\u503c\u662f\u7b2c\u4e00\u4e2a\u5b8c\u6210\u7684Task(&#8220;\u5185\u90e8&#8221;\u4efb\u52a1)\u3002\u5982\u679c\u5f53\u5185\u90e8\u4efb\u52a1\u5b8c\u6210\u65f6\u5b58\u5728\u5f02\u5e38\uff0c\u90a3\u4e48\u8be5\u5f02\u5e38\u5e76\u4e0d\u4f1a\u4f20\u64ad\u81f3\u5916\u90e8\u4efb\u52a1\uff08Task.WhenAny\u8fd4\u56de\u7684\u4efb\u52a1\uff09\u3002\u5728\u5185\u90e8\u4efb\u52a1\u5b8c\u6210\u540e\uff0c\u5e94\u5bf9\u5176\u4e88\u4ee5\u7b49\u5f85\uff0c\u786e\u4fdd\u89c2\u5bdf\u5230\u6240\u6709\u5f02\u5e38\u3002<\/p>\n<p>&nbsp;&nbsp;&nbsp;&nbsp;\u5f53\u7b2c\u4e00\u4e2a\u4efb\u52a1\u5b8c\u6210\u65f6\uff0c\u8003\u8651\u662f\u5426\u53d6\u6d88\u5269\u4e0b\u7684\u4efb\u52a1\u3002\u5982\u679c\u6ca1\u6709\u53d6\u6d88\u5176\u4ed6\u7684\u4efb\u52a1\uff0c\u5355\u9875\u6ca1\u6709\u4e88\u4ee5\u7b49\u5f85\uff0c\u90a3\u4e48\u4ed6\u4eec\u4fbf\u4f1a\u88ab\u4e22\u5f03\u3002\u88ab\u4e22\u5f03\u7684\u4efb\u52a1\u4f1a\u8fd0\u884c\u81f3\u5b8c\u6210\uff0c\u4f46\u7a0b\u5e8f\u4f1a\u5ffd\u89c6\u5176\u8fd0\u884c\u7ed3\u679c\uff0c\u540c\u65f6\u4f1a\u5ffd\u89c6\u8fd9\u4e9b\u4efb\u52a1\u4e2d\u7684\u6240\u6709\u5f02\u5e38\u3002\u5982\u679c\u6ca1\u6709\u53d6\u6d88\u8fd9\u4e9b\u4efb\u52a1\uff0c\u90a3\u4e48\u5b83\u4eec\u81ea\u7136\u4f1a\u7ee7\u7eed\u8fd0\u884c\uff0c\u767d\u767d\u5730\u5360\u7528HTTP\u8fde\u63a5\u3001\u6570\u636e\u5e93\u8fde\u63a5\u6216\u8ba1\u65f6\u5668\u7b49\u8d44\u6e90\u3002<\/p>\n<p>\u4f7f\u7528Task.WhenAny\u53ef\u4ee5\u5b9e\u73b0\u8d85\u65f6\uff08\u6bd4\u5982\uff0c\u5c06Task.Delay\u7528\u4f5c\u4efb\u52a1\u4e4b\u4e00\uff09\uff0c\u4f46\u6211\u5e76\u4e0d\u63a8\u8350\u8fd9\u6837\u505a\u3002\u7528\u53d6\u6d88\u6765\u8868\u8fbe\u8d85\u65f6\u66f4\u5408\u4e4e\u60c5\u7406\uff0c\u800c\u4e14\u53d6\u6d88\u53ef\u4ee5\u5e26\u6765\u589e\u76ca\uff0c\u5b83\u53ef\u4ee5\u5207\u5b9e\u5730\u53d6\u6d88\u8d85\u65f6\u4efb\u52a1\u3002<br \/>\nTask.WhenAny\u7684\u53e6\u4e00\u4e2a\u53cd\u6a21\u5f0f\u662f\u5728\u4efb\u52a1\u5b8c\u6210\u65f6\u5904\u7406\u5b83\u4eec\u3002\u7559\u5b58\u4e00\u4e2a\u4efb\u52a1\u5217\u8868\u5e76\u5c06\u5b8c\u6210\u4efb\u52a1\u4ece\u5217\u8868\u4e2d\u9010\u4e2a\u79fb\u9664\uff0c\u548b\u770b\u4e4b\u4e0b\u5f88\u5408\u7406\uff0c\u4f46\u8fd9\u79cd\u65b9\u6cd5\u7684\u95ee\u9898\u662f\uff0c\u5b83\u6267\u884c\u4e86<span class=\"katex math inline\">O(N^2)<\/span>\u7684\u65f6\u95f4\uff0c\u800c\u5176\u5b9e\u53ef\u4ee5\u91c7\u7528<span class=\"katex math inline\">O(N)<\/span>\u7b97\u6cd5<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Contents1 \u95ee\u98982 \u89e3\u51b3\u65b9\u68483 \u8ba8\u8bba \u95ee\u9898 \u5047\u8bbe\u624b\u5934\u6709\u82e5\u5e72\u9879\u4efb\u52a1\uff0c\u9700\u8981\u54cd\u5e94\u5176\u4e2d\u5b8c\u6210\u7684\u90a3\u4e00\u9879\u3002\u6bd4\u5982\u540c\u4e8b\u4ece [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,41,2],"tags":[],"class_list":["post-790","post","type-post","status-publish","format-standard","hentry","category-c","category-41","category-2"],"_links":{"self":[{"href":"https:\/\/www.wayln.com\/index.php?rest_route=\/wp\/v2\/posts\/790","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wayln.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wayln.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wayln.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wayln.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=790"}],"version-history":[{"count":1,"href":"https:\/\/www.wayln.com\/index.php?rest_route=\/wp\/v2\/posts\/790\/revisions"}],"predecessor-version":[{"id":791,"href":"https:\/\/www.wayln.com\/index.php?rest_route=\/wp\/v2\/posts\/790\/revisions\/791"}],"wp:attachment":[{"href":"https:\/\/www.wayln.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=790"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wayln.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=790"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wayln.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=790"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}