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JSON 序列化</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link menu__link--active" aria-current="page" href="/docs/signalr">24. 即时通讯</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/process-service">25. 辅助角色服务 (Worker Service)</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist" aria-expanded="false" href="/docs/category/job">26. 定时任务 (Schedule)</a><button aria-label="Expand sidebar category '26. 定时任务 (Schedule)'" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/idgenerator">27. 分布式 ID 生成</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/module-dev">28. 模块化开发</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/clayobj">29. 粘土对象</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/sensitive-detection">30. 脱敏处理</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/file-provider">31. 虚拟文件系统(上传下载)</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/sesssion-state">32. 会话和状态管理</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/ipc">33. 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<p>即时通讯(Instant messaging,简称 IM)通常是指互联网上用以进行实时通讯的系统,允许两人或多人使用网络即时的传递文字信息、文档、语音与视频交流。</p>
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<p>即时通讯不同于 E-mail 在于它的交谈是实时的。大部分的即时通讯服务提供了状态信息的特性 ── 显示联络人名单,联络人是否在线上与能否与联络人交谈。</p>
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<p>在互联网上目前使用较广的即时通讯服务包括 Windows Live Messenger、AOL Instant Messenger、Skype、Yahoo! Messenger、NET Messenger Service、Jabber、ICQ 与 QQ 等。</p>
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<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="242-即时通讯应用场景">24.2 即时通讯应用场景<a href="#242-即时通讯应用场景" class="hash-link" aria-label="Direct link to 24.2 即时通讯应用场景" title="Direct link to 24.2 即时通讯应用场景"></a></h2>
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<p>即时通讯应用场景非常广泛,需要实时交互消息的都需要。如:</p>
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<ul>
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<li>聊天工具:QQ、WeChat、在线客服等</li>
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<li>手游网游:王者荣耀、魔兽等</li>
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<li>网络直播:腾讯课堂、抖音直播等</li>
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<li>订单推送:美团、餐饮下单系统等</li>
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<li>协同办公:公司内部文件分享、工作安排、在线会议等。</li>
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</ul>
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<p>以上只是列举了比较常用的应用场景,但即时通讯的作用远不止于此。</p>
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<p>文档紧急编写中,可以先看官方文档:<a href="https://docs.microsoft.com/zh-cn/aspnet/core/signalr/introduction?view=aspnetcore-5.0" target="_blank" rel="noopener noreferrer">https://docs.microsoft.com/zh-cn/aspnet/core/signalr/introduction?view=aspnetcore-5.0</a></p>
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<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="243-关于-signalr">24.3 关于 <code>SignalR</code><a href="#243-关于-signalr" class="hash-link" aria-label="Direct link to 243-关于-signalr" title="Direct link to 243-关于-signalr"></a></h2>
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<p>即时通讯技术实现是复杂且过于底层化,所以微软为了简化即时通讯应用程序,开发出了一个强大且简易使用的通信库:<code>SignalR</code>,通过该库我们可以轻松实现类似 QQ、微信这类 IM 聊天工具,也能快速实现消息推送、订单推送这样的系统。</p>
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<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="2431-微软官方介绍">24.3.1 微软官方介绍<a href="#2431-微软官方介绍" class="hash-link" aria-label="Direct link to 24.3.1 微软官方介绍" title="Direct link to 24.3.1 微软官方介绍"></a></h3>
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<p>ASP.NET Core SignalR 是一种开放源代码库,可简化将实时 web 功能添加到应用程序的功能。 实时 web 功能使服务器端代码可以立即将内容推送到客户端。</p>
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<p>适用于 SignalR :</p>
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<ul>
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<li>需要从服务器进行高频率更新的应用。 示例包括游戏、社交网络、投票、拍卖、地图和 GPS 应用。</li>
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<li>仪表板和监视应用。 示例包括公司仪表板、即时销售更新或旅行警报。</li>
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<li>协作应用。 协作应用的示例包括白板应用和团队会议软件。</li>
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<li>需要通知的应用。 社交网络、电子邮件、聊天、游戏、旅行警报和很多其他应用都需使用通知。</li>
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</ul>
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<p>目前 <code>SignalR</code> 已经内置在 <code>.NET 5 SDK</code> 中。同时 <code>SignalR</code> 支持 <code>Web、App、Console、Desktop</code> 等多个应用平台。</p>
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<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="244-注册-signalr-服务">24.4 注册 <code>SignalR</code> 服务<a href="#244-注册-signalr-服务" class="hash-link" aria-label="Direct link to 244-注册-signalr-服务" title="Direct link to 244-注册-signalr-服务"></a></h2>
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<p>在 <code>Furion</code> 框架中,任何服务功能都需要先注册后再使用,<code>SignalR</code> 也不例外。只需要在 <code>Startup.cs</code> 中添加注册即可:</p>
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<div class="language-cs codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-cs codeBlock_bY9V thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_e6Vv codeBlockLinesWithNumbering_o6Pm"><span class="token-line theme-code-block-highlighted-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token keyword" style="font-style:italic">using</span><span class="token plain"> </span><span class="token namespace" style="color:rgb(178, 204, 214)">Microsoft</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">AspNetCore</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">Builder</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"></span><span class="token keyword" style="font-style:italic">using</span><span class="token plain"> </span><span class="token namespace" style="color:rgb(178, 204, 214)">Microsoft</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">AspNetCore</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">Hosting</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span></span><br></span><span class="token-line 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style="font-style:italic">using</span><span class="token plain"> </span><span class="token namespace" style="color:rgb(178, 204, 214)">Microsoft</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">Extensions</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">Hosting</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain" style="display:inline-block"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"></span><span class="token keyword" style="font-style:italic">namespace</span><span class="token plain"> </span><span class="token namespace" style="color:rgb(178, 204, 214)">Furion</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">Web</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">Core</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">public</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">sealed</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">class</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">Startup</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token type-list class-name" style="color:rgb(255, 203, 107)">AppStartup</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">public</span><span class="token plain"> </span><span class="token return-type class-name keyword" style="color:rgb(255, 203, 107);font-style:italic">void</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">ConfigureServices</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">IServiceCollection</span><span class="token plain"> services</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// 其他代码...</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain" style="display:inline-block"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// 添加即时通讯</span><span class="token plain"></span></span><br></span><span class="token-line theme-code-block-highlighted-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> services</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">AddSignalR</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain" style="display:inline-block"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">public</span><span class="token plain"> </span><span class="token return-type class-name keyword" style="color:rgb(255, 203, 107);font-style:italic">void</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">Configure</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">IApplicationBuilder</span><span class="token plain"> app</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">IWebHostEnvironment</span><span class="token plain"> env</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// 其他代码...</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain" style="display:inline-block"></span></span><br></span><span class="token-line theme-code-block-highlighted-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> app</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">UseEndpoints</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">endpoints </span><span class="token operator" style="color:rgb(137, 221, 255)">=></span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// 注册集线器</span><span class="token plain"></span></span><br></span><span class="token-line theme-code-block-highlighted-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> endpoints</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">MapHubs</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain" style="display:inline-block"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> endpoints</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">MapControllerRoute</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token named-parameter punctuation" style="color:rgb(199, 146, 234)">name</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"default"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token named-parameter punctuation" style="color:rgb(199, 146, 234)">pattern</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"{controller=Home}/{action=Index}/{id?}"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span></span><br></span><span class="token-line codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div>
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<h2 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="245-signalr-长连接和集线器">24.5 <code>SignalR</code> 长连接和集线器<a href="#245-signalr-长连接和集线器" class="hash-link" aria-label="Direct link to 245-signalr-长连接和集线器" title="Direct link to 245-signalr-长连接和集线器"></a></h2>
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<p><code>SignalR</code> 包含两种用于在客户端和服务器之间进行通信的模型:<code>持久性连接</code>和 <code>集线器</code> 中心。</p>
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<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="2451-持久性连接">24.5.1 持久性连接<a href="#2451-持久性连接" class="hash-link" aria-label="Direct link to 24.5.1 持久性连接" title="Direct link to 24.5.1 持久性连接"></a></h3>
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<p>连接表示用于发送单接收方、分组或广播消息的简单终结点。 <code>持久性连接</code> (在 .NET 代码中由 PersistentConnection 类表示,在 ASP.NET Core SignalR 中 ,PersistentConnection 类已被删除。) 使开发人员能够直接访问 <code>SignalR</code> 公开的低级别通信协议。 使用基于连接的 Api (如 Windows Communication Foundation)的开发人员将对使用连接通信模型非常熟悉。</p>
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<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="2452-集线器">24.5.2 集线器<a href="#2452-集线器" class="hash-link" aria-label="Direct link to 24.5.2 集线器" title="Direct link to 24.5.2 集线器"></a></h3>
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<p>集线器是一种基于连接 API 构建的更高级别管道,<strong>它允许客户端和服务器直接调用方法</strong>。 <code>SignalR</code> 就像魔术一样处理跨机器边界的调度,使客户端能够像本地方法一样轻松地调用服务器上的方法,反之亦然。 如果开 |