{"id":219,"date":"2016-12-06T22:01:10","date_gmt":"2016-12-06T14:01:10","guid":{"rendered":"https:\/\/blog.freesilo.com\/?p=219"},"modified":"2016-12-06T22:01:10","modified_gmt":"2016-12-06T14:01:10","slug":"%e5%88%a9%e7%94%a8-async-await-%e7%9a%84%e5%bc%82%e6%ad%a5%e7%bc%96%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/freesilo.com\/?p=219","title":{"rendered":"\u5229\u7528 async &#038; await \u7684\u5f02\u6b65\u7f16\u7a0b"},"content":{"rendered":"<h2><strong>\u4e00\u3001\u5f02\u6b65\u7f16\u7a0b\u7684\u7b80\u4ecb<\/strong><\/h2>\n<p>\u901a\u8fc7\u4f7f\u7528\u5f02\u6b65\u7f16\u7a0b\uff0c\u4f60\u53ef\u4ee5\u907f\u514d\u6027\u80fd\u74f6\u9888\u5e76\u589e\u5f3a\u5e94\u7528\u7a0b\u5e8f\u7684\u603b\u4f53\u54cd\u5e94\u80fd\u529b\u3002<\/p>\n<p>Visual Studio 2012 \u5f15\u5165\u4e86\u4e00\u4e2a\u7b80\u5316\u7684\u65b9\u6cd5\uff0c\u5f02\u6b65\u7f16\u7a0b\uff0c\u5728 .NET Framework 4.5 \u548c Windows \u8fd0\u884c\u65f6\u5229\u7528\u5f02\u6b65\u652f\u6301\u3002\u7f16\u8bd1\u5668\u53ef\u6267\u884c\u5f00\u53d1\u4eba\u5458\u66fe\u8fdb\u884c\u7684\u9ad8\u96be\u5ea6\u5de5\u4f5c\uff0c\u4e14\u5e94\u7528\u7a0b\u5e8f\u4fdd\u7559\u4e86\u4e00\u4e2a\u7c7b\u4f3c\u4e8e\u540c\u6b65\u4ee3\u7801\u7684\u903b\u8f91\u7ed3\u6784\u3002\u56e0\u6b64\uff0c\u60a8\u4ec5\u9700\u8981\u8fdb\u884c\u4e00\u5c0f\u90e8\u5206\u5de5\u4f5c\u5c31\u53ef\u4ee5\u83b7\u5f97\u5f02\u6b65\u7f16\u7a0b\u7684\u6240\u6709\u4f18\u70b9\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>\u4e8c\u3001\u5f02\u6b65\u63d0\u9ad8\u54cd\u5e94\u80fd\u529b<\/strong><\/h2>\n<p>\u5f02\u6b65\u5bf9\u53ef\u80fd\u5f15\u8d77\u963b\u585e\u7684\u6d3b\u52a8\uff08\u4f8b\u5982\u5e94\u7528\u7a0b\u5e8f\u8bbf\u95ee Web \u65f6\uff09\u81f3\u5173\u91cd\u8981\u3002\u5bf9 Web \u8d44\u6e90\u7684\u8bbf\u95ee\u6709\u65f6\u5f88\u6162\u6216\u4f1a\u5ef6\u8fdf\u3002\u5982\u679c\u6b64\u7c7b\u6d3b\u52a8\u5728\u540c\u6b65\u8fc7\u7a0b\u4e2d\u53d7\u963b\uff0c\u5219\u6574\u4e2a\u5e94\u7528\u7a0b\u5e8f\u5fc5\u987b\u7b49\u5f85\u3002\u00a0\u5728\u5f02\u6b65\u8fc7\u7a0b\u4e2d\uff0c\u5e94\u7528\u7a0b\u5e8f\u53ef\u7ee7\u7eed\u6267\u884c\u4e0d\u4f9d\u8d56 Web \u8d44\u6e90\u7684\u5176\u4ed6\u5de5\u4f5c\uff0c\u76f4\u81f3\u6f5c\u5728\u963b\u585e\u7684\u4efb\u52a1\u5b8c\u6210\u3002<\/p>\n<p>\u4e0b\u56fe\u663e\u793a\u4e86\u5f02\u6b65\u7f16\u7a0b\u63d0\u9ad8\u54cd\u5e94\u80fd\u529b\u7684\u5178\u578b\u5e94\u7528\u573a\u666f\u3002\u5305\u542b\u4ece .NET Framework 4.5 \u548c Windows \u8fd0\u884c\u65f6\u4e2d\u5217\u51fa\u7684\u4e00\u4e9b\u5305\u542b\u652f\u6301\u5f02\u6b65\u7f16\u7a0b\u7684\u65b9\u6cd5\u7684\u7c7b\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-221\" src=\"https:\/\/blog.freesilo.com\/wp-content\/uploads\/2016\/12\/640.png\" alt=\"640\" width=\"621\" height=\"384\" srcset=\"https:\/\/freesilo.com\/wp-content\/uploads\/2016\/12\/640.png 621w, https:\/\/freesilo.com\/wp-content\/uploads\/2016\/12\/640-300x186.png 300w\" sizes=\"auto, (max-width: 621px) 100vw, 621px\" \/><\/p>\n<p>\u7531\u4e8e\u6240\u6709\u4e0e\u7528\u6237\u754c\u9762\u76f8\u5173\u7684\u6d3b\u52a8\u901a\u5e38\u5171\u4eab\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u56e0\u6b64\uff0c\u5f02\u6b65\u5bf9\u8bbf\u95ee UI \u7ebf\u7a0b\u7684\u5e94\u7528\u7a0b\u5e8f\u6765\u8bf4\u5c24\u4e3a\u91cd\u8981\u3002\u00a0\u5982\u679c\u5728\u4e00\u4e2a\u540c\u6b65\u5e94\u7528\u7a0b\u5e8f\u4e2d\u6709\u4efb\u4f55\u7684\u7ebf\u7a0b\u88ab\u963b\u585e\u4e86\uff0c\u90a3\u4e48\u6240\u6709\u7ebf\u7a0b\u90fd\u5c06\u88ab\u963b\u585e\uff0c\u518d\u4e25\u91cd\u4e00\u70b9\uff0c\u4f60\u7684\u5e94\u7528\u7a0b\u5e8f\u5c06\u4f1a\u505c\u6b62\u54cd\u5e94\u3002<\/p>\n<p>\u4f7f\u7528\u5f02\u6b65\u65b9\u6cd5\u65f6\uff0c\u5e94\u7528\u7a0b\u5e8f\u5c06\u7ee7\u7eed\u54cd\u5e94 UI\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u8c03\u6574\u7a97\u53e3\u7684\u5927\u5c0f\u6216\u6700\u5c0f\u5316\u7a97\u53e3\uff1b\u5982\u679c\u4f60\u4e0d\u5e0c\u671b\u7b49\u5f85\u5e94\u7528\u7a0b\u5e8f\u7ed3\u675f\uff0c\u5219\u53ef\u4ee5\u5c06\u5176\u5173\u95ed\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>\u4e09\u3001\u66f4\u5bb9\u6613\u7f16\u5199\u7684\u5f02\u6b65\u65b9\u6cd5<\/strong><\/h2>\n<p>C# \u4e2d\u7684\u00a0async\u00a0\u548c\u00a0await\u00a0\u5173\u952e\u5b57\u90fd\u662f\u5f02\u6b65\u7f16\u7a0b\u7684\u6838\u5fc3\u3002\u901a\u8fc7\u4f7f\u7528\u8fd9\u4e24\u4e2a\u5173\u952e\u5b57\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 .NET framework \u6216 Windows \u8fd0\u884c\u65f6\u4e2d\u7684\u8d44\u6e90\u8f7b\u677e\u521b\u5efa\u5f02\u6b65\u65b9\u6cd5\uff08\u51e0\u4e4e\u4e0e\u521b\u5efa\u540c\u6b65\u65b9\u6cd5\u4e00\u6837\u8f7b\u677e\uff09\u3002<\/p>\n<p>\u4e0b\u9762\u7684\u793a\u4f8b\u6f14\u793a\u4e86\u4e00\u79cd\u4f7f\u7528 async \u548c await \u5b9a\u4e49\u7684\u5f02\u6b65\u65b9\u6cd5\u3002<\/p>\n<blockquote><p>\/\/\/ &lt;summary&gt;<\/p>\n<p>\/\/\/ \u5f02\u6b65\u8bbf\u95ee Web<\/p>\n<p>\/\/\/ &lt;\/summary&gt;<\/p>\n<p>\/\/\/ &lt;returns&gt;&lt;\/returns&gt;<\/p>\n<p>\/\/\/ &lt;remarks&gt;<\/p>\n<p>\/\/\/ \u65b9\u6cd5\u7b7e\u540d\u7684 3 \u8981\u7d20\uff1a<\/p>\n<p>\/\/\/ \u00a0 \u00a0 \u2460 async \u4fee\u9970\u7b26<\/p>\n<p>\/\/\/ \u00a0 \u00a0 \u2461 \u8fd4\u56de\u7c7b\u578b Task \u6216 Task&lt;TResult&gt;\uff1a\u8fd9\u91cc\u7684 Task&lt;int&gt; \u8868\u793a return \u8bed\u53e5\u8fd4\u56de int \u7c7b\u578b<\/p>\n<p>\/\/\/ \u00a0 \u00a0 \u2462 \u65b9\u6cd5\u540d\u4ee5 Async \u7ed3\u5c3e<\/p>\n<p>\/\/\/ &lt;\/remarks&gt;<\/p>\n<p>async Task&lt;int&gt; AccessTheWebAsync()<\/p>\n<p>{<\/p>\n<p>\/\/\u8bb0\u5f97 using System.Net.Http \u54e6<\/p>\n<p>var client = new HttpClient();<\/p>\n<p>\/\/\u6267\u884c\u5f02\u6b65\u65b9\u6cd5 GetStringAsync<\/p>\n<p>Task&lt;string&gt; getStringTask = client.GetStringAsync(&#8220;http:\/\/www.google.com.hk\/&#8221;);<\/p>\n<p>\/\/\u5047\u8bbe\u5728\u8fd9\u91cc\u6267\u884c\u4e00\u4e9b\u975e\u5f02\u6b65\u7684\u64cd\u4f5c<\/p>\n<p>DoIndependentWork();<\/p>\n<p>\/\/\u7b49\u5f85\u64cd\u4f5c\u6302\u8d77\u65b9\u6cd5 AccessTheWebAsync<\/p>\n<p>\/\/\u76f4\u5230 getStringTask \u5b8c\u6210\uff0cAccessTheWebAsync \u65b9\u6cd5\u624d\u4f1a\u7ee7\u7eed\u6267\u884c<\/p>\n<p>\/\/\u540c\u65f6\uff0c\u63a7\u5236\u5c06\u8fd4\u56de\u5230 AccessTheWebAsync \u65b9\u6cd5\u7684\u8c03\u7528\u65b9<\/p>\n<p>\/\/\u76f4\u5230 getStringTask \u5b8c\u6210\u540e\uff0c\u5c06\u5728\u8fd9\u91cc\u6062\u590d\u63a7\u5236\u3002<\/p>\n<p>\/\/\u7136\u540e\u4ece getStringTask \u62ff\u5230\u5b57\u7b26\u4e32\u7ed3\u679c<\/p>\n<p>string urlContents = await getStringTask;<\/p>\n<p>\/\/\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\uff08int \u7c7b\u578b\uff09<\/p>\n<p>return urlContents.Length;<\/p>\n<p>}<\/p><\/blockquote>\n<p>\u5982\u679c AccessTheWebAsync \u5728\u8c03\u7528 GetStringAsync \u65f6\u6ca1\u6709\u5176\u5b83\u64cd\u4f5c\uff0c\u4f60\u53ef\u4ee5\u7528\u8fd9\u6837\u7684\u65b9\u5f0f\u6765\u7b80\u5316\u4ee3\u7801\u3002<\/p>\n<blockquote><p>string urlContents = await client.GetStringAsync(&#8220;http:\/\/www.google.com.hk\/&#8221;);<\/p><\/blockquote>\n<p>\u6839\u636e\u4ee5\u4e0a\u4ee3\u7801\u8fdb\u884c\u7b80\u5355\u603b\u7ed3\uff1a<\/p>\n<p>\uff081\uff09\u65b9\u6cd5\u7b7e\u540d\u5305\u542b\u4e00\u4e2a async \u4fee\u9970\u7b26\u3002<\/p>\n<p>\uff082\uff09\u6309\u7167\u7ea6\u5b9a\uff0c\u5f02\u6b65\u65b9\u6cd5\u7684\u540d\u79f0\u4ee5\u201cAsync\u201d\u540e\u7f00\u4e3a\u7ed3\u5c3e\u3002<\/p>\n<p>\uff083\uff09\u8fd4\u56de\u7c7b\u578b\u4e3a\u4e0b\u5217\u7c7b\u578b\u4e4b\u4e00\uff1a<\/p>\n<p>\u2460 \u5982\u679c\u4f60\u7684\u65b9\u6cd5\u6709\u64cd\u4f5c\u6570\u4e3a TResult \u7c7b\u578b\u7684\u8fd4\u56de\u8bed\u53e5\uff0c\u5219\u4e3a Task&lt;TResult&gt;\u3002<\/p>\n<p>\u2461 \u5982\u679c\u4f60\u7684\u65b9\u6cd5\u6ca1\u6709\u8fd4\u56de\u8bed\u53e5\u6216\u5177\u6709\u6ca1\u6709\u64cd\u4f5c\u6570\u7684\u8fd4\u56de\u8bed\u53e5\uff0c\u5219\u4e3a Task\u3002<\/p>\n<p>\u2462 \u5982\u679c\u4f60\u7f16\u5199\u7684\u662f\u5f02\u6b65\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\uff0c\u5219\u4e3a void\u3002<\/p>\n<p>\uff084\uff09\u65b9\u6cd5\u901a\u5e38\u5305\u542b\u81f3\u5c11\u4e00\u4e2a await \u8868\u8fbe\u5f0f\uff0c\u8be5\u8868\u8fbe\u5f0f\u6807\u8bb0\u4e00\u4e2a\u70b9\uff0c\u5728\u8be5\u70b9\u4e0a\uff0c\u76f4\u5230\u7b49\u5f85\u7684\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210\u65b9\u6cd5\u624d\u80fd\u7ee7\u7eed\u3002 \u540c\u65f6\uff0c\u5c06\u65b9\u6cd5\u6302\u8d77\uff0c\u5e76\u4e14\u63a7\u5236\u6743\u5c06\u8fd4\u56de\u5230\u65b9\u6cd5\u7684\u8c03\u7528\u65b9\u3002<\/p>\n<p>\u5728\u5f02\u6b65\u65b9\u6cd5\u4e2d\uff0c\u53ef\u4f7f\u7528\u63d0\u4f9b\u7684\u5173\u952e\u5b57\u548c\u7c7b\u578b\u6765\u6307\u793a\u9700\u8981\u5b8c\u6210\u7684\u64cd\u4f5c\uff0c\u4e14\u7f16\u8bd1\u5668\u4f1a\u5b8c\u6210\u5176\u4f59\u64cd\u4f5c\u3002<\/p>\n<p><strong>\u56db\u3001\u5f02\u6b65\u65b9\u6cd5\u7684\u63a7\u5236\u6d41\uff08\u6838\u5fc3\uff09<\/strong><\/p>\n<p>\u5f02\u6b65\u7f16\u7a0b\u4e2d\u6700\u9700\u5f04\u6e05\u7684\u662f\u63a7\u5236\u6d41\uff0c\u5373\u5982\u4f55\u4ece\u4e00\u4e2a\u65b9\u6cd5\u79fb\u52a8\u5230\u53e6\u4e00\u4e2a\u65b9\u6cd5\uff0c \u8bf7\u7528\u4e00\u9897\u611f\u6069\u7684\u5fc3\u6765\u89c2\u5bdf\u4e0b\u56fe\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-220\" src=\"https:\/\/blog.freesilo.com\/wp-content\/uploads\/2016\/12\/6401.jpg\" alt=\"6401\" width=\"610\" height=\"503\" srcset=\"https:\/\/freesilo.com\/wp-content\/uploads\/2016\/12\/6401.jpg 610w, https:\/\/freesilo.com\/wp-content\/uploads\/2016\/12\/6401-300x247.jpg 300w\" sizes=\"auto, (max-width: 610px) 100vw, 610px\" \/><\/p>\n<p>\u6b65\u9aa4\u89e3\u6790\uff1a<\/p>\n<p>\u2460\u00a0\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u8c03\u7528\u5e76\u7b49\u5f85\u00a0AccessTheWebAsync\u00a0\u5f02\u6b65\u65b9\u6cd5\u3002<\/p>\n<p>\u2461\u00a0AccessTheWebAsync \u521b\u5efa\u00a0HttpClient\u00a0\u5bf9\u8c61\u5e76\u8c03\u7528\u5b83\u7684\u00a0GetStringAsync\u00a0\u5f02\u6b65\u65b9\u6cd5\u6765\u4e0b\u8f7d\u7f51\u7ad9\u5185\u5bb9\u3002<\/p>\n<p>\u2462 \u5047\u8bbe\u00a0GetStringAsync\u00a0\u4e2d\u53d1\u751f\u4e86\u67d0\u79cd\u60c5\u51b5\uff0c\u8be5\u60c5\u51b5\u6302\u8d77\u4e86\u5b83\u7684\u8fdb\u7a0b\u3002\u53ef\u80fd\u5fc5\u987b\u7b49\u5f85\u7f51\u7ad9\u4e0b\u8f7d\u6216\u4e00\u4e9b\u5176\u4ed6\u963b\u585e\u7684\u6d3b\u52a8\u3002\u4e3a\u907f\u514d\u963b\u585e\u8d44\u6e90\uff0cGetStringAsync\u00a0\u4f1a\u5c06\u63a7\u5236\u6743\u51fa\u8ba9\u7ed9\u5176\u8c03\u7528\u65b9\u00a0AccessTheWebAsync\u3002GetStringAsync\u00a0\u8fd4\u56de\u00a0Task\uff0c\u5176\u4e2d TResult \u4e3a\u5b57\u7b26\u4e32\uff0c\u5e76\u4e14\u00a0AccessTheWebAsync\u00a0\u5c06\u4efb\u52a1\u5206\u914d\u7ed9\u00a0getStringTask\u00a0\u53d8\u91cf\u3002\u8be5\u4efb\u52a1\u8868\u793a\u8c03\u7528\u00a0GetStringAsync\u00a0\u7684\u6b63\u5728\u8fdb\u884c\u7684\u8fdb\u7a0b\uff0c\u5176\u4e2d\u627f\u8bfa\u5f53\u5de5\u4f5c\u5b8c\u6210\u65f6\u4ea7\u751f\u5b9e\u9645\u5b57\u7b26\u4e32\u503c\u3002<\/p>\n<p>\u2463\u00a0\u7531\u4e8e\u5c1a\u672a\u7b49\u5f85\u00a0getStringTask\uff0c\u56e0\u6b64\uff0cAccessTheWebAsync\u00a0\u53ef\u4ee5\u7ee7\u7eed\u6267\u884c\u4e0d\u4f9d\u8d56\u4e8e\u00a0GetStringAsync\u00a0\u5f97\u51fa\u6700\u7ec8\u7ed3\u679c\u7684\u5176\u4ed6\u4efb\u52a1\u3002\u8be5\u4efb\u52a1\u7531\u5bf9\u540c\u6b65\u65b9\u6cd5\u00a0DoIndependentWork\u00a0\u7684\u8c03\u7528\u8868\u793a\u3002<\/p>\n<p>\u2464\u00a0DoIndependentWork\u00a0\u662f\u5b8c\u6210\u5176\u5de5\u4f5c\u5e76\u8fd4\u56de\u5176\u8c03\u7528\u65b9\u7684\u540c\u6b65\u65b9\u6cd5\u3002<\/p>\n<p>\u2465\u00a0AccessTheWebAsync\u00a0\u5df2\u5b8c\u6210\u5de5\u4f5c\uff0c\u53ef\u4ee5\u4e0d\u53d7\u00a0getStringTask\u00a0\u7684\u7ed3\u679c\u5f71\u54cd\u3002\u00a0\u63a5\u4e0b\u6765\uff0cAccessTheWebAsync\u00a0\u9700\u8981\u8ba1\u7b97\u5e76\u8fd4\u56de\u8be5\u4e0b\u8f7d\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\uff0c\u4f46\u8be5\u65b9\u6cd5\u4ec5\u5728\u5177\u6709\u5b57\u7b26\u4e32\u65f6\u624d\u80fd\u8ba1\u7b97\u8be5\u503c\u3002\u56e0\u6b64\uff0cAccessTheWebAsync\u00a0\u4f7f\u7528\u4e00\u4e2a await \u8fd0\u7b97\u7b26\u6765\u6302\u8d77\u5176\u8fdb\u5ea6\uff0c\u5e76\u628a\u63a7\u5236\u6743\u4ea4\u7ed9\u8c03\u7528\u00a0AccessTheWebAsync\u00a0\u7684\u65b9\u6cd5\u3002AccessTheWebAsync\u00a0\u5c06\u00a0Task&lt;int&gt;\u00a0\u8fd4\u56de\u81f3\u8c03\u7528\u65b9\u3002\u00a0\u8be5\u4efb\u52a1\u8868\u793a\u5bf9\u4ea7\u751f\u4e0b\u8f7d\u5b57\u7b26\u4e32\u957f\u5ea6\u7684\u6574\u6570\u7ed3\u679c\u7684\u4e00\u4e2a\u627f\u8bfa\u3002<\/p>\n<p>\u3010\u5907\u6ce8\u3011\u5982\u679c\u00a0GetStringAsync\uff08\u5373\u00a0getStringTask\uff09\u5728\u00a0AccessTheWebAsync\u00a0\u7b49\u5f85\u524d\u5b8c\u6210\uff0c\u5219\u63a7\u5236\u6743\u4f1a\u4fdd\u7559\u5728\u00a0AccessTheWebAsync\u00a0\u4e2d\u3002\u00a0\u5982\u679c\u5f02\u6b65\u8c03\u7528\u8fc7\u7a0b (getStringTask) \u5df2\u5b8c\u6210\uff0c\u5e76\u4e14 AccessTheWebSync \u4e0d\u5fc5\u7b49\u5f85\u6700\u7ec8\u7ed3\u679c\uff0c\u5219\u6302\u8d77\u7136\u540e\u8fd4\u56de\u5230\u00a0AccessTheWebAsync\uff0c\u4f46\u8fd9\u4f1a\u9020\u6210\u6210\u672c\u7684\u6d6a\u8d39\u3002<\/p>\n<p>\u5728\u8c03\u7528\u65b9\u5185\u90e8\uff08\u5047\u8bbe\u8fd9\u662f\u4e00\u4e2a\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\uff09\uff0c\u5904\u7406\u6a21\u5f0f\u5c06\u7ee7\u7eed\u3002\u5728\u7b49\u5f85\u7ed3\u679c\u524d\uff0c\u8c03\u7528\u65b9\u53ef\u4ee5\u5f00\u5c55\u4e0d\u4f9d\u8d56\u4e8e\u00a0AccessTheWebAsync\u00a0\u7ed3\u679c\u7684\u5176\u4ed6\u5de5\u4f5c\uff0c\u5426\u5219\u5c31\u9700\u7b49\u5f85\u7247\u523b\u3002\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u7b49\u5f85\u00a0AccessTheWebAsync\uff0c\u800c\u00a0AccessTheWebAsync\u00a0\u7b49\u5f85\u00a0GetStringAsync\u3002<\/p>\n<p>\u2466\u00a0GetStringAsync\u00a0\u5b8c\u6210\u5e76\u751f\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\u7ed3\u679c\u3002\u00a0\u5b57\u7b26\u4e32\u7ed3\u679c\u4e0d\u662f\u901a\u8fc7\u4f60\u9884\u671f\u7684\u65b9\u5f0f\u8c03\u7528\u00a0GetStringAsync\u00a0\u6240\u8fd4\u56de\u7684\u3002\uff08\u8bf7\u8bb0\u4f4f\uff0c\u6b64\u65b9\u6cd5\u5df2\u5728\u6b65\u9aa4 3 \u4e2d\u8fd4\u56de\u4e00\u4e2a\u4efb\u52a1\u3002\uff09\u76f8\u53cd\uff0c\u5b57\u7b26\u4e32\u7ed3\u679c\u5b58\u50a8\u5728\u8868\u793a\u5b8c\u6210\u65b9\u6cd5\u00a0getStringTask\u00a0\u7684\u4efb\u52a1\u4e2d\u3002\u00a0await \u8fd0\u7b97\u7b26\u4ece\u00a0getStringTask\u00a0\u4e2d\u68c0\u7d22\u7ed3\u679c\u3002\u8d4b\u503c\u8bed\u53e5\u5c06\u68c0\u7d22\u5230\u7684\u7ed3\u679c\u8d4b\u7ed9\u00a0urlContents\u3002<\/p>\n<p>\u2467\u00a0\u5f53\u00a0AccessTheWebAsync\u00a0\u5177\u6709\u5b57\u7b26\u4e32\u7ed3\u679c\u65f6\uff0c\u8be5\u65b9\u6cd5\u53ef\u4ee5\u8ba1\u7b97\u5b57\u7b26\u4e32\u957f\u5ea6\u3002\u7136\u540e\uff0cAccessTheWebAsync\u00a0\u5de5\u4f5c\u4e5f\u5c06\u5b8c\u6210\uff0c\u5e76\u4e14\u7b49\u5f85\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u53ef\u7ee7\u7eed\u4f7f\u7528\u3002<\/p>\n<p>\u4f60\u53ef\u4ee5\u5c1d\u8bd5\u601d\u8003\u4e00\u4e0b\u540c\u6b65\u884c\u4e3a\u548c\u5f02\u6b65\u884c\u4e3a\u4e4b\u95f4\u7684\u5dee\u5f02\u3002\u5f53\u5176\u5de5\u4f5c\u5b8c\u6210\u65f6\uff08\u7b2c 5 \u6b65\uff09\u4f1a\u8fd4\u56de\u4e00\u4e2a\u540c\u6b65\u65b9\u6cd5\uff0c\u4f46\u5f53\u5176\u5de5\u4f5c\u6302\u8d77\u65f6\uff08\u7b2c 3 \u6b65\u548c\u7b2c 6 \u6b65\uff09\uff0c\u5f02\u6b65\u65b9\u6cd5\u4f1a\u8fd4\u56de\u4e00\u4e2a\u4efb\u52a1\u503c\u3002\u5728\u5f02\u6b65\u65b9\u6cd5\u6700\u7ec8\u5b8c\u6210\u5176\u5de5\u4f5c\u65f6\uff0c\u4efb\u52a1\u4f1a\u6807\u8bb0\u4e3a\u5df2\u5b8c\u6210\uff0c\u800c\u7ed3\u679c\uff08\u5982\u679c\u6709\uff09\u5c06\u5b58\u50a8\u5728\u4efb\u52a1\u4e2d\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>\u4e94\u3001\u7ebf\u7a0b<\/strong><\/h2>\n<p>\u5f02\u6b65\u65b9\u6cd5\u65e8\u5728\u6210\u4e3a\u975e\u963b\u585e\u64cd\u4f5c\u3002\u5f02\u6b65\u65b9\u6cd5\u4e2d\u7684 await \u8868\u8fbe\u5f0f\u5728\u7b49\u5f85\u7684\u4efb\u52a1\u6b63\u5728\u8fd0\u884c\u65f6\u4e0d\u4f1a\u963b\u585e\u5f53\u524d\u7ebf\u7a0b\u3002\u76f8\u53cd\uff0c\u8868\u8fbe\u5f0f\u5728\u7ee7\u7eed\u65f6\u6ce8\u518c\u65b9\u6cd5\u7684\u5176\u4f59\u90e8\u5206\u5e76\u5c06\u63a7\u5236\u6743\u8fd4\u56de\u5230\u5f02\u6b65\u65b9\u6cd5\u7684\u8c03\u7528\u65b9\u3002<\/p>\n<p>async \u548c await \u5173\u952e\u5b57\u4e0d\u4f1a\u5bfc\u81f4\u521b\u5efa\u5176\u4ed6\u7ebf\u7a0b\u3002\u56e0\u4e3a\u5f02\u6b65\u65b9\u6cd5\u4e0d\u4f1a\u5728\u5176\u81ea\u8eab\u7ebf\u7a0b\u4e0a\u8fd0\u884c\uff0c\u56e0\u6b64\u5b83\u4e0d\u9700\u8981\u591a\u7ebf\u7a0b\u3002\u53ea\u6709\u5f53\u65b9\u6cd5\u5904\u4e8e\u6d3b\u52a8\u72b6\u6001\u65f6\uff0c\u8be5\u65b9\u6cd5\u5c06\u5728\u5f53\u524d\u540c\u6b65\u4e0a\u4e0b\u6587\u4e2d\u8fd0\u884c\u5e76\u4f7f\u7528\u7ebf\u7a0b\u4e0a\u7684\u65f6\u95f4\u3002\u53ef\u4ee5\u4f7f\u7528\u00a0Task.Run\u00a0\u5c06\u5360\u7528\u5927\u91cf CPU \u7684\u5de5\u4f5c\u79fb\u5230\u540e\u53f0\u7ebf\u7a0b\uff0c\u4f46\u662f\u540e\u53f0\u7ebf\u7a0b\u4e0d\u4f1a\u5e2e\u52a9\u6b63\u5728\u7b49\u5f85\u7ed3\u679c\u7684\u8fdb\u7a0b\u53d8\u4e3a\u53ef\u7528\u72b6\u6001\u3002<\/p>\n<p>\u5bf9\u4e8e\u5f02\u6b65\u7f16\u7a0b\u800c\u8a00\uff0c\u8be5\u57fa\u4e8e\u5f02\u6b65\u7684\u65b9\u6cd5\u4f18\u4e8e\u51e0\u4e4e\u6bcf\u4e2a\u7528\u4f8b\u4e2d\u7684\u73b0\u6709\u65b9\u6cd5\u3002\u5177\u4f53\u800c\u8a00\uff0c\u6b64\u65b9\u6cd5\u6bd4\u00a0BackgroundWorker\u00a0\u66f4\u9002\u7528\u4e8e IO \u7ed1\u5b9a\u7684\u64cd\u4f5c\uff0c\u56e0\u4e3a\u6b64\u4ee3\u7801\u66f4\u7b80\u5355\u4e14\u65e0\u9700\u9632\u6b62\u62a2\u5148\u4e89\u7528\u6761\u4ef6\u3002<\/p>\n<p>\u7ed3\u5408\u00a0Task.Run\u00a0\u4f7f\u7528\u65f6\uff0c\u5f02\u6b65\u7f16\u7a0b\u6bd4\u00a0BackgroundWorker\u00a0\u66f4\u9002\u7528\u4e8e CPU \u7ed1\u5b9a\u7684\u64cd\u4f5c\uff0c\u56e0\u4e3a\u5f02\u6b65\u7f16\u7a0b\u5c06\u8fd0\u884c\u4ee3\u7801\u7684\u534f\u8c03\u7ec6\u8282\u4e0e\u00a0Task.Run\u00a0\u4f20\u8f93\u81f3\u7ebf\u7a0b\u6c60\u7684\u5de5\u4f5c\u533a\u5206\u5f00\u6765\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>\u516d\u3001async \u548c await<\/strong><\/h2>\n<p>\u5982\u679c\u901a\u8fc7\u4f7f\u7528\u00a0async\u00a0\u4fee\u9970\u7b26\u6307\u5b9a\u67d0\u79cd\u65b9\u6cd5\u4e3a\u5f02\u6b65\u65b9\u6cd5\uff0c\u5219\u4f1a\u51fa\u73b0\u4e0b\u9762\u4e24\u79cd\u73b0\u8c61\u3002<\/p>\n<ul class=\"list-paddingleft-2\">\n<li>\u6807\u8bb0\u7684\u5f02\u6b65\u65b9\u6cd5\u53ef\u4ee5\u4f7f\u7528\u00a0await\u00a0\u6765\u6307\u5b9a\u60ac\u6302\u70b9\u3002await \u8fd0\u7b97\u7b26\u901a\u77e5\u7f16\u8bd1\u5668\u5f02\u6b65\u65b9\u6cd5\u53ea\u6709\u76f4\u5230\u7b49\u5f85\u7684\u5f02\u6b65\u8fc7\u7a0b\u5b8c\u6210\u624d\u80fd\u7ee7\u7eed\u901a\u8fc7\u8be5\u70b9\u3002\u540c\u65f6\uff0c\u63a7\u5236\u6743\u5c06\u8fd4\u56de\u81f3\u5f02\u6b65\u65b9\u6cd5\u7684\u8c03\u7528\u65b9\u3002<\/li>\n<li>await \u8868\u8fbe\u5f0f\u4e2d\u5f02\u6b65\u65b9\u6cd5\u7684\u6302\u8d77\u4e0d\u80fd\u4f7f\u8be5\u65b9\u6cd5\u9000\u51fa\uff0c\u5e76\u4e14\u00a0finally\u00a0\u5757\u4e0d\u4f1a\u8fd0\u884c\u3002<\/li>\n<li>\u6807\u8bb0\u7684\u5f02\u6b65\u65b9\u6cd5\u672c\u8eab\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528\u5b83\u7684\u65b9\u6cd5\u7b49\u5f85\u3002<\/li>\n<\/ul>\n<p>\u5f02\u6b65\u65b9\u6cd5\u901a\u5e38\u5305\u542b await \u8fd0\u7b97\u7b26\u7684\u4e00\u4e2a\u6216\u591a\u4e2a\u5339\u914d\u9879\uff0c\u4f46\u7f3a\u5c11 await \u8868\u8fbe\u5f0f\u4e0d\u4f1a\u5bfc\u81f4\u7f16\u8bd1\u5668\u9519\u8bef\u3002\u5982\u679c\u5f02\u6b65\u65b9\u6cd5\u672a\u4f7f\u7528 await \u8fd0\u7b97\u7b26\u6807\u8bb0\u60ac\u6302\u70b9\uff0c\u5219\u8be5\u65b9\u6cd5\u5c06\u4f5c\u4e3a\u540c\u6b65\u65b9\u6cd5\u6267\u884c\uff0c\u4e0d\u7ba1\u5f02\u6b65\u4fee\u9970\u7b26\u5982\u4f55\u3002\u7f16\u8bd1\u5668\u5c06\u4e3a\u6b64\u7c7b\u65b9\u6cd5\u53d1\u5e03\u4e00\u4e2a\u8b66\u544a\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>\u4e03\u3001\u8fd4\u56de\u7c7b\u578b\u548c\u53c2\u6570\u4fe1\u606f<\/strong><\/h2>\n<p>\u5728 .NET \u4e2d\uff0c\u5f02\u6b65\u65b9\u6cd5\u901a\u5e38\u8fd4\u56de\u00a0Task\u00a0\u6216\u00a0Task&lt;TResult&gt;\u3002\u5728\u5f02\u6b65\u65b9\u6cd5\u4e2d\uff0cawait \u8fd0\u7b97\u7b26\u5e94\u7528\u4e8e\u901a\u8fc7\u8c03\u7528\u53e6\u4e00\u4e2a\u5f02\u6b65\u65b9\u6cd5\u8fd4\u56de\u7684\u4efb\u52a1\u3002<\/p>\n<p>\u5982\u679c\u65b9\u6cd5\u5305\u542b\u00a0\u6307\u5b9a\u7c7b\u578b\u00a0TResult\u00a0\u7684\u64cd\u4f5c\u6570\u7684\u00a0return\u00a0\u8bed\u53e5\uff0c\u5219\u5c06\u00a0Task&lt;TResult&gt;\u00a0\u6307\u5b9a\u4e3a\u8fd4\u56de\u7c7b\u578b\u3002<\/p>\n<p>\u5982\u679c\u65b9\u6cd5\u4e0d\u542b\u4efb\u4f55 return \u8bed\u53e5\u6216\u5305\u542b\u4e0d\u8fd4\u56de\u64cd\u4f5c\u6570\u7684 return \u8bed\u53e5\uff0c\u5219\u5c06\u00a0Task\u00a0\u7528\u4f5c\u8fd4\u56de\u7c7b\u578b\u3002<\/p>\n<p>\u4e0b\u9762\u7684\u793a\u4f8b\u6f14\u793a\u5982\u4f55\u58f0\u660e\u5e76\u8c03\u7528\u53ef\u8fd4\u56de\u00a0Task\u00a0\u6216\u00a0Task&lt;TResult&gt; \u7684\u65b9\u6cd5\u3002<\/p>\n<blockquote><p>static async Task&lt;Guid&gt; Method1Async()\u3000\u3000\/\/Task&lt;Guid&gt;<\/p>\n<p>{<\/p>\n<p>var result = Guid.NewGuid();<\/p>\n<p>await Task.Delay(1);<\/p>\n<p>\/\/\u8fd9\u91cc\u8fd4\u56de\u4e00\u4e2a Guid \u7684\u7c7b\u578b<\/p>\n<p>return result;<\/p>\n<p>}<\/p>\n<p>static async Task Method2Async()\u3000\u3000\/\/Task<\/p>\n<p>{<\/p>\n<p>\/\/Do&#8230;<\/p>\n<p>await Task.Delay(1);<\/p>\n<p>\/\/Do&#8230;<\/p>\n<p>\/\/\u8fd9\u91cc\u6ca1\u6709 return \u8bed\u53e5<\/p>\n<p>}<\/p><\/blockquote>\n<blockquote><p>\/\/\u8c03\u7528 Method1Async<\/p>\n<p>\/\/\u65b9\u5f0f\u4e00<\/p>\n<p>Task&lt;Guid&gt; t1 = Method1Async();<\/p>\n<p>Guid guid1 = t1.Result;<\/p>\n<p>\/\/\u65b9\u5f0f\u4e8c<\/p>\n<p>Guid guid2 = await Method1Async();<\/p>\n<p>\/\/\u8c03\u7528 Method2Async<\/p>\n<p>\/\/\u65b9\u5f0f\u4e00<\/p>\n<p>Task t2 = Method2Async();<\/p>\n<p>await t2;<\/p>\n<p>\/\/\u65b9\u5f0f\u4e8c<\/p>\n<p>await Method2Async();<\/p><\/blockquote>\n<p>\u6bcf\u4e2a\u8fd4\u56de\u7684\u4efb\u52a1\u8868\u793a\u6b63\u5728\u8fdb\u884c\u7684\u5de5\u4f5c\u3002\u4efb\u52a1\u53ef\u5c01\u88c5\u6709\u5173\u5f02\u6b65\u8fdb\u7a0b\u72b6\u6001\u7684\u4fe1\u606f\uff0c\u5982\u679c\u672a\u6210\u529f\uff0c\u5219\u6700\u540e\u4f1a\u5c01\u88c5\u6765\u81ea\u8fdb\u7a0b\u7684\u6700\u7ec8\u7ed3\u679c\u6216\u8fdb\u7a0b\u5f15\u53d1\u7684\u5f02\u5e38\u3002<\/p>\n<p>\u5f02\u6b65\u65b9\u6cd5\u8fd8\u53ef\u4ee5\u662f\u5177\u6709\u00a0void\u00a0\u8fd4\u56de\u7c7b\u578b\u3002\u8be5\u8fd4\u56de\u7c7b\u578b\u4e3b\u8981\u7528\u4e8e\u5b9a\u4e49\u9700\u8981\u00a0void\u00a0\u8fd4\u56de\u7c7b\u578b\u7684\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u3002\u5f02\u6b65\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u901a\u5e38\u7528\u4f5c\u5f02\u6b65\u7a0b\u5e8f\u7684\u8d77\u59cb\u70b9\u3002<\/p>\n<p>\u65e0\u6cd5\u7b49\u5f85\u5177\u6709\u00a0void\u00a0\u8fd4\u56de\u7c7b\u578b\u7684\u5f02\u6b65\u65b9\u6cd5\uff0c\u5e76\u4e14\u4e00\u4e2a void \u8fd4\u56de\u503c\u7684\u8c03\u7528\u65b9\u65e0\u6cd5\u6355\u83b7\u8be5\u65b9\u6cd5\u5f15\u53d1\u7684\u4efb\u4f55\u5f02\u5e38\u3002<\/p>\n<p>\u5f02\u6b65\u65b9\u6cd5\u65e0\u6cd5\u58f0\u660e C# \u4e2d\u7684\u00a0ref\u00a0\u6216\u00a0out\u00a0\u53c2\u6570\uff0c\u4f46\u6b64\u65b9\u6cd5\u53ef\u4ee5\u8c03\u7528\u5177\u6709\u6b64\u7c7b\u53c2\u6570\u7684\u65b9\u6cd5\u3002<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>\u516b\u3001\u547d\u540d\u7684\u7ea6\u5b9a<\/strong><\/h2>\n<p>\u6839\u636e\u7ea6\u5b9a\uff0c\u5c06\u201cAsync\u201d\u8ffd\u52a0\u5230\u5177\u6709\u00a0async\u00a0\u4fee\u9970\u7b26\u7684\u65b9\u6cd5\u540d\u79f0\u3002<\/p>\n<p>\u5982\u679c\u67d0\u4e00\u7ea6\u5b9a\u4e2d\u7684\u4e8b\u4ef6\u3001\u57fa\u7c7b\u6216\u63a5\u53e3\u534f\u5b9a\u5efa\u8bae\u5176\u4ed6\u540d\u79f0\uff0c\u5219\u53ef\u4ee5\u5ffd\u7565\u6b64\u7ea6\u5b9a\u3002\u4f8b\u5982\uff0c\u4f60\u4e0d\u5e94\u91cd\u547d\u540d\u5e38\u7528\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\uff0c\u4f8b\u5982\u00a0btnOpen_Click\u3002<\/p>\n<p>\u94fe\u63a5\uff1acnblogs.com\/liqingwen\/p\/5922573.html<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u5f02\u6b65\u7f16\u7a0b\u7684\u7b80\u4ecb \u901a\u8fc7\u4f7f\u7528\u5f02\u6b65\u7f16\u7a0b\uff0c\u4f60\u53ef\u4ee5\u907f\u514d\u6027\u80fd\u74f6\u9888\u5e76\u589e\u5f3a\u5e94\u7528\u7a0b\u5e8f\u7684\u603b\u4f53\u54cd\u5e94&#8230;<br \/><a class=\"read-more-button\" href=\"https:\/\/freesilo.com\/?p=219\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-219","post","type-post","status-publish","format-standard","hentry","category-csharp"],"_links":{"self":[{"href":"https:\/\/freesilo.com\/index.php?rest_route=\/wp\/v2\/posts\/219","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/freesilo.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/freesilo.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/freesilo.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/freesilo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=219"}],"version-history":[{"count":1,"href":"https:\/\/freesilo.com\/index.php?rest_route=\/wp\/v2\/posts\/219\/revisions"}],"predecessor-version":[{"id":222,"href":"https:\/\/freesilo.com\/index.php?rest_route=\/wp\/v2\/posts\/219\/revisions\/222"}],"wp:attachment":[{"href":"https:\/\/freesilo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=219"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/freesilo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=219"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/freesilo.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=219"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}