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\u6838\u5fc3\u5c42&#xff1a;ViewModel\u5c42<\/h4>\n<p>ViewModel\u7684\u552f\u4e00\u804c\u8d23&#xff0c;\u5c31\u662f\u5bf9\u63a5UI\u548c\u4e1a\u52a1\u670d\u52a1&#xff0c;\u7ba1\u7406\u9875\u9762\u7684UI\u72b6\u6001\u3002<\/p>\n<p>\u5b83\u4e0d\u80fd\u6301\u6709\u4efb\u4f55\u4e32\u53e3\u3001PLC\u8fde\u63a5\u5bf9\u8c61&#xff0c;\u4e0d\u80fd\u76f4\u63a5\u8bfb\u5199\u786c\u4ef6\u5bc4\u5b58\u5668&#xff0c;\u4e5f\u4e0d\u80fd\u51fa\u73b0\u4efb\u4f55UI\u63a7\u4ef6\u7c7b\u578b\u7684\u5f15\u7528\u3002\u5b83\u505a\u7684\u4e8b\u60c5\u53ea\u6709\u4e09\u4ef6&#xff1a;<\/p>\n<ul>\n<li>\u4ece\u4e1a\u52a1\u670d\u52a1\u5c42\u83b7\u53d6\u6570\u636e&#xff0c;\u8f6c\u6362\u6210UI\u53ef\u4ee5\u76f4\u63a5\u7ed1\u5b9a\u7684\u683c\u5f0f<\/li>\n<li>\u628a\u7528\u6237\u7684\u64cd\u4f5c&#xff08;\u6309\u94ae\u70b9\u51fb\u3001\u53c2\u6570\u8f93\u5165&#xff09;\u901a\u8fc7\u547d\u4ee4\u8c03\u7528&#xff0c;\u8f6c\u53d1\u7ed9\u4e1a\u52a1\u670d\u52a1\u5c42<\/li>\n<li>\u7ef4\u62a4\u5f53\u524d\u9875\u9762\u7684UI\u72b6\u6001&#xff1a;\u6bd4\u5982\u9009\u4e2d\u7684\u914d\u65b9\u3001\u5f53\u524d\u663e\u793a\u7684\u9875\u9762\u3001\u5f39\u7a97\u662f\u5426\u6253\u5f00<\/li>\n<\/ul>\n<p>\u5f88\u591a\u4eba\u628aViewModel\u5199\u5f97\u6700\u91cd&#xff0c;\u4ec0\u4e48\u903b\u8f91\u90fd\u5f80\u91cc\u585e&#xff0c;\u8fd9\u662f\u5b8c\u5168\u641e\u53cd\u4e86\u4e3b\u6b21\u3002\u5de5\u63a7\u9879\u76ee\u91cc&#xff0c;\u4e1a\u52a1\u670d\u52a1\u5c42\u624d\u662f\u6838\u5fc3&#xff0c;ViewModel\u53ea\u662f\u4e00\u5ea7\u6865\u3002<\/p>\n<h4>4. \u8868\u73b0\u5c42&#xff1a;View\u5c42<\/h4>\n<p>\u7eafUI\u5c42&#xff0c;\u6240\u6709\u6570\u636e\u901a\u8fc7Binding\u7ed1\u5b9a&#xff0c;\u6240\u6709\u7528\u6237\u64cd\u4f5c\u7528Command\u4f20\u9012\u3002<\/p>\n<p>\u540e\u53f0\u4ee3\u7801&#xff08;.xaml.cs&#xff09;\u91cc\u53ea\u80fd\u6709\u521d\u59cb\u5316\u76f8\u5173\u7684\u4ee3\u7801&#xff0c;\u4e0d\u80fd\u51fa\u73b0\u4efb\u4f55\u4e1a\u52a1\u903b\u8f91\u3001\u901a\u4fe1\u903b\u8f91&#xff0c;\u751a\u81f3\u8fdeMessageBox\u90fd\u4e0d\u5e94\u8be5\u76f4\u63a5\u5f39\u2014\u2014\u8981\u4e48\u7528\u4ea4\u4e92\u670d\u52a1&#xff0c;\u8981\u4e48\u901a\u8fc7ViewModel\u63a7\u5236\u5f39\u7a97\u72b6\u6001\u3002<\/p>\n<p>\u4e00\u53e5\u8bdd\u5224\u65adView\u5199\u5f97\u5408\u4e0d\u5408\u683c&#xff1a;\u628a.xaml.cs\u91cc\u9664\u4e86\u6784\u9020\u51fd\u6570\u4e4b\u5916\u7684\u4ee3\u7801\u5168\u5220\u6389&#xff0c;\u4e1a\u52a1\u529f\u80fd\u4f9d\u7136\u80fd\u6b63\u5e38\u8dd1\u3002<\/p>\n<h3>\u4e09\u3001\u5de5\u63a7MVVM\u6838\u5fc3\u5b9e\u6218&#xff1a;\u4e94\u4e2a\u5173\u952e\u573a\u666f\u7684\u6b63\u786e\u89e3\u6cd5<\/h3>\n<p>\u5206\u5c42\u662f\u9aa8\u67b6&#xff0c;\u5177\u4f53\u573a\u666f\u7684\u5199\u6cd5\u624d\u662f\u8840\u8089\u3002\u4e0b\u9762\u8fd9\u4e94\u4e2a\u95ee\u9898&#xff0c;\u662f\u5de5\u63a7\u9879\u76ee\u91cc\u767e\u5206\u767e\u4f1a\u9047\u5230\u7684&#xff0c;\u4e5f\u662fDemo\u6559\u7a0b\u4ece\u6765\u4e0d\u4f1a\u8bb2\u900f\u7684\u3002<\/p>\n<h4>1. \u9ad8\u9891\u5b9e\u65f6\u6570\u636e&#xff1a;\u522b\u518d\u6bcf\u4e2a\u5c5e\u6027\u90fd\u89e6\u53d1\u901a\u77e5<\/h4>\n<p>\u75db\u70b9&#xff1a;\u4e0a\u767e\u4e2a\u70b9\u4f4d100ms\u91c7\u6837\u4e00\u6b21&#xff0c;\u6bcf\u4e2a\u5c5e\u6027\u90fd\u8c03\u7528RaisePropertyChanged&#xff0c;UI\u7ebf\u7a0b\u88ab\u5360\u6ee1&#xff0c;\u7a0b\u5e8f\u8d8a\u8dd1\u8d8a\u5361\u3002<\/p>\n<p>\u6b63\u786e\u505a\u6cd5&#xff1a;\u6570\u636e\u91c7\u6837\u548cUI\u5237\u65b0\u5206\u79bb<\/p>\n<ul>\n<li>\u8bbe\u5907\u5c42\u548c\u670d\u52a1\u5c42\u5168\u901f\u66f4\u65b0\u6570\u636e\u7f13\u5b58&#xff0c;\u4fdd\u8bc1\u6570\u636e\u5b9e\u65f6\u6027<\/li>\n<li>UI\u5c42\u964d\u9891\u5237\u65b0&#xff0c;\u6309\u56fa\u5b9a\u5468\u671f&#xff08;\u6bd4\u5982150~200ms&#xff09;\u6279\u91cf\u8bfb\u53d6\u6700\u65b0\u6570\u636e&#xff0c;\u4e00\u6b21\u6027\u66f4\u65b0\u5c5e\u6027\u3001\u89e6\u53d1\u901a\u77e5<\/li>\n<li>\u4eba\u773c\u5bf9\u5de5\u4e1a\u76d1\u63a7\u6570\u636e\u7684\u8bc6\u522b\u6781\u9650\u5728200ms\u5de6\u53f3&#xff0c;\u518d\u5feb\u7684UI\u5237\u65b0\u6ca1\u6709\u5b9e\u9645\u610f\u4e49&#xff0c;\u5f92\u589e\u6027\u80fd\u6d88\u8017<\/li>\n<\/ul>\n<p>\u5b9e\u73b0\u4e0a\u5f88\u7b80\u5355&#xff1a;\u5728ViewModel\u91cc\u7528\u4e00\u4e2a\u5b9a\u65f6\u8c03\u5ea6\u5668&#xff0c;\u5b9a\u65f6\u4ece\u6570\u636e\u670d\u52a1\u91cc\u62c9\u53d6\u5168\u91cf\u6700\u65b0\u503c&#xff0c;\u6279\u91cf\u8d4b\u503c\u540e\u7edf\u4e00\u901a\u77e5\u3002\u6211\u4eec\u4e4b\u524d\u7684\u4ea7\u7ebf\u9879\u76ee\u7528\u8fd9\u4e2a\u65b9\u6848&#xff0c;200\u4e2a\u70b9\u4f4d\u7684CPU\u5360\u7528\u76f4\u63a5\u964d\u4e8670%&#xff0c;\u5185\u5b58\u589e\u957f\u4e5f\u7a33\u5b9a\u4e86\u3002<\/p>\n<h4>2. \u547d\u4ee4\u6a21\u5f0f&#xff1a;\u522b\u53ea\u4f1a\u5199\u65e0\u53c2\u6570RelayCommand<\/h4>\n<p>\u75db\u70b9&#xff1a;\u5de5\u63a7\u91cc\u7edd\u5927\u591a\u6570\u64cd\u4f5c\u90fd\u5e26\u53c2\u6570\u2014\u2014\u8bbe\u7f6e\u8f6c\u901f\u3001\u542f\u52a8\u6307\u5b9a\u7535\u673a\u3001\u4e0b\u8f7d\u9009\u4e2d\u7684\u914d\u65b9&#xff0c;\u5f88\u591a\u4eba\u8fd8\u662f\u7ed5\u56de\u540e\u53f0\u4ee3\u7801\u4f20\u53c2&#xff0c;\u767d\u7528\u4e86Command\u3002<\/p>\n<p>\u6b63\u786e\u505a\u6cd5&#xff1a;\u6cdb\u578b\u547d\u4ee4&#043;\u5f02\u6b65\u547d\u4ee4\u53cc\u7ba1\u9f50\u4e0b<\/p>\n<ul>\n<li>\u5e26\u53c2\u6570\u7684\u64cd\u4f5c\u7edf\u4e00\u7528RelayCommand&lt;T&gt;&#xff0c;\u53c2\u6570\u901a\u8fc7CommandParameter\u4eceView\u7ed1\u5b9a\u8fc7\u6765&#xff0c;ViewModel\u91cc\u76f4\u63a5\u62ff\u5230\u5f3a\u7c7b\u578b\u53c2\u6570<\/li>\n<li>\u8017\u65f6\u64cd\u4f5c&#xff08;\u6bd4\u5982\u4e0b\u8f7d\u914d\u65b9\u3001\u8bbe\u5907\u6821\u51c6\u3001\u6279\u91cf\u5199\u5bc4\u5b58\u5668&#xff09;\u5fc5\u987b\u7528\u5f02\u6b65\u547d\u4ee4AsyncCommand&#xff0c;\u7edd\u5bf9\u4e0d\u80fd\u963b\u585eUI\u7ebf\u7a0b<\/li>\n<li>\u547d\u4ee4\u6267\u884c\u91cc\u7edf\u4e00\u505a\u6743\u9650\u6821\u9a8c\u548c\u5f02\u5e38\u6355\u83b7&#xff1a;\u5de5\u4e1a\u7a0b\u5e8f\u7684\u5e95\u7ebf\u662f\u4e0d\u80fd\u5d29&#xff0c;\u5199PLC\u5931\u8d25\u3001\u901a\u4fe1\u4e2d\u65ad\u90fd\u8981\u6355\u83b7\u5f02\u5e38&#xff0c;\u8bb0\u5f55\u65e5\u5fd7&#043;\u63d0\u793a\u7528\u6237&#xff0c;\u4e0d\u80fd\u76f4\u63a5\u8ba9\u7a0b\u5e8f\u95ea\u9000<\/li>\n<\/ul>\n<p>\u8bb0\u4f4f\u4e00\u6761\u539f\u5219&#xff1a;Command\u91cc\u53ea\u505a\u8c03\u5ea6&#xff0c;\u4e0d\u5199\u5177\u4f53\u4e1a\u52a1\u5b9e\u73b0\u3002\u771f\u6b63\u7684\u903b\u8f91\u8981\u653e\u5728\u4e1a\u52a1\u670d\u52a1\u5c42&#xff0c;Command\u53ea\u662f\u8c03\u7528\u5b83\u3002<\/p>\n<h4>3. \u8de8\u9875\u9762\u901a\u4fe1&#xff1a;\u6d88\u606f\u673a\u5236\u80fd\u7528&#xff0c;\u4f46\u522b\u6ee5\u7528<\/h4>\n<p>\u75db\u70b9&#xff1a;\u5f88\u591a\u4eba\u5b66\u4e86MVVM\u5c31\u89c9\u5f97\u4e0d\u80fd\u76f4\u63a5\u5f15\u7528&#xff0c;\u6240\u6709\u8de8\u9875\u9762\u4ea4\u4e92\u5168\u9760Messenger\u53d1\u6d88\u606f&#xff0c;\u6700\u540e\u6d88\u606f\u6cdb\u6ee5&#xff0c;\u8c03\u8bd5\u56f0\u96be&#xff0c;\u8fd8\u5bb9\u6613\u5185\u5b58\u6cc4\u6f0f\u3002<\/p>\n<p>\u6b63\u786e\u8fb9\u754c&#xff1a;\u5171\u4eab\u670d\u52a1\u4f18\u5148&#xff0c;\u6d88\u606f\u53ea\u505a\u5e7f\u64ad<\/p>\n<ul>\n<li>\u80fd\u7528\u5171\u4eab\u670d\u52a1\u89e3\u51b3\u7684&#xff0c;\u7edd\u5bf9\u4e0d\u8981\u53d1\u6d88\u606f\u3002\u6bd4\u5982\u5168\u5c40\u62a5\u8b66\u5217\u8868\u3001\u8bbe\u5907\u8fde\u63a5\u72b6\u6001&#xff0c;\u76f4\u63a5\u653e\u5728\u5bf9\u5e94\u7684\u5355\u4f8b\u670d\u52a1\u91cc&#xff0c;\u6240\u6709ViewModel\u5f15\u7528\u540c\u4e00\u4e2a\u670d\u52a1\u5b9e\u4f8b\u5c31\u884c&#xff0c;\u6e05\u6670\u53c8\u597d\u8c03\u8bd5<\/li>\n<li>\u53ea\u6709\u771f\u6b63\u7684\u5168\u5c40\u5e7f\u64ad\u573a\u666f&#xff0c;\u624d\u9002\u5408\u7528\u6d88\u606f&#xff1a;\u6bd4\u5982\u7d27\u6025\u505c\u673a\u3001\u7cfb\u7edf\u6a21\u5f0f\u5207\u6362&#xff0c;\u9700\u8981\u540c\u65f6\u901a\u77e5\u591a\u4e2a\u4e0d\u76f8\u5173\u7684\u9875\u9762<\/li>\n<li>\u8ba2\u9605\u6d88\u606f\u5fc5\u987b\u548cViewModel\u751f\u547d\u5468\u671f\u7ed1\u5b9a&#xff0c;\u9875\u9762\u9500\u6bc1\u65f6\u4e00\u5b9a\u8981\u6ce8\u9500\u8ba2\u9605&#xff0c;\u8fd9\u662fMVVM\u9879\u76ee\u6700\u5e38\u89c1\u7684\u5185\u5b58\u6cc4\u6f0f\u6765\u6e90&#xff0c;\u6ca1\u6709\u4e4b\u4e00<\/li>\n<\/ul>\n<h4>4. \u96c6\u5408\u6570\u636e&#xff1a;ObservableCollection\u4e0d\u662f\u4e07\u91d1\u6cb9<\/h4>\n<p>\u75db\u70b9&#xff1a;\u5b9e\u65f6\u62a5\u8b66\u5217\u8868\u3001\u70b9\u4f4d\u5217\u8868\u9891\u7e41\u589e\u5220&#xff0c;ObservableCollection\u6bcf\u6b21\u6539\u52a8\u90fd\u89e6\u53d1CollectionChanged&#xff0c;\u6570\u636e\u91cf\u5927\u7684\u65f6\u5019UI\u76f4\u63a5\u5361\u6b7b\u3002<\/p>\n<p>\u6b63\u786e\u505a\u6cd5&#xff1a;\u6279\u91cf\u66f4\u65b0&#043;\u6309\u9700\u52a0\u8f7d<\/p>\n<ul>\n<li>\u7ed9\u96c6\u5408\u5199\u6269\u5c55\u65b9\u6cd5&#xff0c;\u6279\u91cf\u64cd\u4f5c\u524d\u6682\u505c\u901a\u77e5&#xff0c;\u64cd\u4f5c\u5b8c\u6210\u540e\u89e6\u53d1\u4e00\u6b21\u91cd\u7f6e\u901a\u77e5&#xff0c;\u907f\u514d\u9891\u7e41\u5237\u65b0UI<\/li>\n<li>\u5386\u53f2\u6570\u636e\u3001\u62a5\u8b66\u8bb0\u5f55\u8fd9\u7c7b\u957f\u5217\u8868&#xff0c;\u4e0d\u8981\u5168\u91cf\u52a0\u8f7d\u5230\u5185\u5b58\u91cc&#xff0c;\u7528UI\u865a\u62df\u5316&#043;\u5206\u9875\/\u6eda\u52a8\u52a0\u8f7d&#xff0c;\u51e0\u767e\u4e0a\u5343\u6761\u6570\u636e\u5b8c\u5168\u6ca1\u5fc5\u8981\u4e00\u6b21\u6027\u585e\u8fdb\u96c6\u5408<\/li>\n<li>\u5b9e\u65f6\u62a5\u8b66\u5217\u8868\u63a7\u5236\u957f\u5ea6&#xff0c;\u53ea\u4fdd\u7559\u6700\u65b0\u7684\u51e0\u767e\u6761&#xff0c;\u8001\u6570\u636e\u81ea\u52a8\u5165\u5e93&#xff0c;\u522b\u8ba9\u96c6\u5408\u65e0\u9650\u589e\u957f<\/li>\n<\/ul>\n<h4>5. \u751f\u547d\u5468\u671f\u7ba1\u7406&#xff1a;\u522b\u8ba9\u9875\u9762\u5207\u6362\u641e\u5d29\u901a\u4fe1<\/h4>\n<p>\u75db\u70b9&#xff1a;\u628a\u901a\u4fe1\u8fde\u63a5\u3001\u4e1a\u52a1\u903b\u8f91\u5199\u5728\u9875\u9762ViewModel\u91cc&#xff0c;\u5207\u4e00\u6b21\u9875\u9762\u5c31\u65ad\u5f00\u91cd\u8fde&#xff0c;\u73b0\u573a\u64cd\u4f5c\u5458\u9891\u7e41\u5207\u9875\u9762&#xff0c;\u76f4\u63a5\u628aPLC\u8fde\u63a5\u5360\u6ee1\u3002<\/p>\n<p>\u6b63\u786e\u505a\u6cd5&#xff1a;\u670d\u52a1\u5355\u4f8b\u5316&#xff0c;\u9875\u9762\u53ea\u8ba2\u9605<\/p>\n<ul>\n<li>\u901a\u4fe1\u670d\u52a1\u3001\u6838\u5fc3\u4e1a\u52a1\u670d\u52a1\u5168\u90e8\u505a\u6210\u5355\u4f8b&#xff0c;\u751f\u547d\u5468\u671f\u548c\u6574\u4e2a\u5e94\u7528\u7a0b\u5e8f\u4e00\u81f4&#xff0c;\u548c\u9875\u9762\u5f00\u5173\u5b8c\u5168\u89e3\u8026<\/li>\n<li>ViewModel\u53ea\u8ba2\u9605\u670d\u52a1\u7684\u4e8b\u4ef6&#xff0c;\u9875\u9762\u5173\u95ed\u65f6\u53d6\u6d88\u8ba2\u9605&#xff0c;\u7edd\u5bf9\u4e0d\u9500\u6bc1\u5e95\u5c42\u670d\u52a1\u548c\u8fde\u63a5<\/li>\n<li>\u53ea\u6709\u9875\u9762\u4e13\u5c5e\u7684\u4e34\u65f6\u72b6\u6001&#xff0c;\u624d\u653e\u5728ViewModel\u91cc&#xff0c;\u968f\u9875\u9762\u9500\u6bc1\u4e00\u8d77\u91ca\u653e<\/li>\n<\/ul>\n<h3>\u56db\u3001\u4e00\u5957\u53ef\u76f4\u63a5\u590d\u7528\u7684\u9879\u76ee\u5206\u5c42\u7ed3\u6784<\/h3>\n<p>\u5f88\u591a\u4eba\u95ee\u6211&#xff0c;\u6807\u51c6\u7684\u5de5\u63a7MVVM\u9879\u76ee\u5e94\u8be5\u600e\u4e48\u5efa\u3002\u4e0b\u9762\u8fd9\u5957\u7ed3\u6784\u662f\u6211\u4eec\u591a\u4e2a\u4ea7\u7ebf\u9879\u76ee\u8e29\u5751\u540e\u6c89\u6dc0\u4e0b\u6765\u7684&#xff0c;\u4e2d\u5c0f\u89c4\u6a21\u9879\u76ee\u76f4\u63a5\u5957\u7528\u5c31\u884c\u3002<\/p>\n<p>ProductionMonitor<br \/>\n\u251c\u2500\u2500 ProductionMonitor.DeviceCommunication  \/\/ \u8bbe\u5907\u901a\u4fe1\u5c42&#xff08;\u65e0UI\u4f9d\u8d56&#xff09;<br \/>\n\u2502   \u251c\u2500\u2500 Interfaces\/      \/\/ \u8bbe\u5907\u5ba2\u6237\u7aef\u7edf\u4e00\u63a5\u53e3<br \/>\n\u2502   \u251c\u2500\u2500 Modbus\/          \/\/ Modbus\u534f\u8bae\u5b9e\u73b0<br \/>\n\u2502   \u251c\u2500\u2500 OpcUa\/           \/\/ OPC UA\u534f\u8bae\u5b9e\u73b0<br \/>\n\u2502   \u2514\u2500\u2500 Models\/          \/\/ \u70b9\u4f4d\u5b9a\u4e49\u3001\u539f\u59cb\u6570\u636e\u6a21\u578b<br \/>\n\u251c\u2500\u2500 ProductionMonitor.BusinessServices    \/\/ \u4e1a\u52a1\u670d\u52a1\u5c42&#xff08;\u65e0UI\u4f9d\u8d56&#xff09;<br \/>\n\u2502   \u251c\u2500\u2500 AlarmService.cs   \/\/ \u62a5\u8b66\u7ba1\u7406\u4e0e\u5224\u65ad<br \/>\n\u2502   \u251c\u2500\u2500 RecipeService.cs  \/\/ \u914d\u65b9\u7ba1\u7406\u4e0e\u4e0b\u8f7d<br \/>\n\u2502   \u251c\u2500\u2500 DataStorage.cs    \/\/ \u5386\u53f2\u6570\u636e\u5b58\u50a8<br \/>\n\u2502   \u2514\u2500\u2500 ProcessControl.cs \/\/ \u81ea\u52a8\u6d41\u7a0b\u63a7\u5236<br \/>\n\u251c\u2500\u2500 ProductionMonitor.ViewModels          \/\/ ViewModel\u5c42<br \/>\n\u2502   \u251c\u2500\u2500 ViewModelBase.cs  \/\/ \u57fa\u7c7b&#xff1a;\u5c5e\u6027\u901a\u77e5\u3001\u547d\u4ee4\u57fa\u7c7b<br \/>\n\u2502   \u251c\u2500\u2500 MainViewModel.cs  \/\/ \u4e3b\u7a97\u53e3ViewModel<br \/>\n\u2502   \u251c\u2500\u2500 MonitorViewModel.cs \/\/ \u76d1\u63a7\u9875\u9762<br \/>\n\u2502   \u2514\u2500\u2500 SettingViewModel.cs \/\/ \u53c2\u6570\u8bbe\u7f6e\u9875\u9762<br \/>\n\u251c\u2500\u2500 ProductionMonitor.Views               \/\/ View\u5c42<br \/>\n\u2502   \u251c\u2500\u2500 MainWindow.xaml<br \/>\n\u2502   \u251c\u2500\u2500 MonitorView.xaml<br \/>\n\u2502   \u2514\u2500\u2500 SettingView.xaml<br \/>\n\u2514\u2500\u2500 ProductionMonitor.Common              \/\/ \u901a\u7528\u5de5\u5177<br \/>\n    \u251c\u2500\u2500 Command\/          \/\/ \u5f02\u6b65\u547d\u4ee4\u3001\u6cdb\u578b\u547d\u4ee4<br \/>\n    \u251c\u2500\u2500 Extensions\/       \/\/ \u96c6\u5408\u3001\u5b57\u7b26\u4e32\u6269\u5c55<br \/>\n    \u2514\u2500\u2500 LogHelper.cs      \/\/ 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