代码拉取完成，页面将自动刷新
Customized-View-Path-And-Theme-Switching-In-AspNetCore.html
70.43 KB
JamesYeung
提交于
2017-12-15 09:46
.
Update Static Site
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<!DOCTYPE html>
<html style="display: none;" lang="zh">
<head>
<meta charset="utf-8">
<!--
© Material Theme
https://github.com/viosey/hexo-theme-material
Version: 1.5.0 -->
<script>
window.materialVersion = "1.5.0"
// Delete localstorage with these tags
window.oldVersion = [
'codestartv1',
'1.3.4',
'1.4.0',
'1.4.0b1'
]
</script>
<!-- dns prefetch -->
<meta http-equiv="x-dns-prefetch-control" content="on">
<link rel="dns-prefetch" href="https://busuanzi.ibruce.info"/>
<!-- Title -->
<title>
ASP.NET Core 中的SEO优化（4）：自定义视图路径及主题切换 |
ElderJames' Blog
</title>
<!-- Meta & Info -->
<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
<meta name="format-detection" content="telephone=no"/>
<meta name="theme-color" content="#0097A7">
<meta name="author" content="James Yeung">
<meta name="description" itemprop="description" content="学习、札记、分享">
<meta name="keywords" content="ElderJames' Blog,.NET Core,ASP.NET Core">
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this.jsRunSequence){if(this.jsRunSequence[k].name==name){this.jsRunSequence[k].code="";this.jsRunSequence[k].status="failed";this.jsRunSequence[k].path=path}}this.runjs()};lsloader.cssfallback=function(path,name,cssonload){if(!!this.cssnamemap[name]){return}else{this.cssnamemap[name]=1}var link=document.createElement("link");link.type="text/css";link.href=path;link.rel="stylesheet";link.onload=link.onerror=cssonload;var root=document.getElementsByTagName("script")[0];root.parentNode.insertBefore(link,root)};lsloader.runInlineScript=function(scriptId,codeId){var code=document.getElementById(codeId).innerText;this.jsRunSequence.push({name:scriptId,code:code});this.runjs()};lsloader.loadCombo=function(jslist){var updateList="";var requestingModules={};for(var k in jslist){var LS=this.getLS(jslist[k].name);if(!!LS){var version=LS.split(versionString)[0];var code=LS.split(versionString)[1]}else{var version=""}if(version==jslist[k].path){this.jsRunSequence.push({name:jslist[k].name,code:code,path:jslist[k].path})}else{this.jsRunSequence.push({name:jslist[k].name,code:null,path:jslist[k].path,status:"comboloading"});requestingModules[jslist[k].name]=true;updateList+=(updateList==""?"":";")+jslist[k].path}}var that=this;if(!!updateList){var xhr=new XMLHttpRequest;xhr.open("get",combo+updateList,true);xhr.onreadystatechange=function(){if(xhr.readyState==4){if(xhr.status>=200&&xhr.status<300||xhr.status==304){if(xhr.response!=""){that.runCombo(xhr.response,requestingModules);return}}else{for(var i in that.jsRunSequence){if(requestingModules[that.jsRunSequence[i].name]){that.jsRunSequence[i].status="failed"}}that.runjs()}}};xhr.send(null)}this.runjs()};lsloader.runCombo=function(comboCode,requestingModules){comboCode=comboCode.split("/*combojs*/");comboCode.shift();for(var k in this.jsRunSequence){if(!!requestingModules[this.jsRunSequence[k].name]&&!!comboCode[0]){this.jsRunSequence[k].status="comboJS";this.jsRunSequence[k].code=comboCode[0];this.setLS(this.jsRunSequence[k].name,this.jsRunSequence[k].path+versionString+comboCode[0]);comboCode.shift()}}this.runjs()}})();</script>
<!-- Import queue -->
<script>function Queue(){this.dataStore=[];this.offer=b;this.poll=d;this.execNext=a;this.debug=false;this.startDebug=c;function b(e){if(this.debug){console.log("Offered a Queued Function.")}if(typeof e==="function"){this.dataStore.push(e)}else{console.log("You must offer a function.")}}function d(){if(this.debug){console.log("Polled a Queued Function.")}return this.dataStore.shift()}function a(){var e=this.poll();if(e!==undefined){if(this.debug){console.log("Run a Queued Function.")}e()}}function c(){this.debug=true}}var queue=new Queue();</script>
<!-- Favicons -->
<link rel="icon shortcut" type="image/ico" href="/img/favicon.png">
<link rel="icon" sizes="192x192" href="/img/favicon.png">
<link rel="apple-touch-icon" href="/img/favicon.png">
<!--iOS -->
<meta name="apple-mobile-web-app-title" content="Title">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="HandheldFriendly" content="True">
<meta name="MobileOptimized" content="480">
<!-- Add to homescreen for Chrome on Android -->
<meta name="mobile-web-app-capable" content="yes">
<!-- Add to homescreen for Safari on iOS -->
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-title" content="ElderJames' Blog">
<!-- Site Verification -->
<!-- RSS -->
<link rel=alternate type="application/rss+xml" href="rss.xml">
<!--[if lte IE 9]>
<link rel="stylesheet" href="/css/ie-blocker.css">
<script src="/js/ie-blocker.zhCN.js"></script>
<![endif]-->
<!-- Import CSS -->
<style id="material_css"></style><script>if(typeof window.lsLoadCSSMaxNums === "undefined")window.lsLoadCSSMaxNums = 0;window.lsLoadCSSMaxNums++;lsloader.load("material_css","/css/material.min.css?976y5g1pRWbrdcUItimr0g==",function(){if(typeof window.lsLoadCSSNums === "undefined")window.lsLoadCSSNums = 0;window.lsLoadCSSNums++;if(window.lsLoadCSSNums == window.lsLoadCSSMaxNums)document.documentElement.style.display="";}, false)</script>
<style id="style_css"></style><script>if(typeof window.lsLoadCSSMaxNums === "undefined")window.lsLoadCSSMaxNums = 0;window.lsLoadCSSMaxNums++;lsloader.load("style_css","/css/style.min.css?J9YGUOg9VFzvsUAJ8qxFsQ==",function(){if(typeof window.lsLoadCSSNums === "undefined")window.lsLoadCSSNums = 0;window.lsLoadCSSNums++;if(window.lsLoadCSSNums == window.lsLoadCSSMaxNums)document.documentElement.style.display="";}, false)</script>
<style id="prettify_css"></style><script>if(typeof window.lsLoadCSSMaxNums === "undefined")window.lsLoadCSSMaxNums = 0;window.lsLoadCSSMaxNums++;lsloader.load("prettify_css","/css/prettify.min.css?UDVrysExI1W3AEkuJF/bUQ==",function(){if(typeof window.lsLoadCSSNums === "undefined")window.lsLoadCSSNums = 0;window.lsLoadCSSNums++;if(window.lsLoadCSSNums == window.lsLoadCSSMaxNums)document.documentElement.style.display="";}, false)</script>
<style id="prettify_theme"></style><script>if(typeof window.lsLoadCSSMaxNums === "undefined")window.lsLoadCSSMaxNums = 0;window.lsLoadCSSMaxNums++;lsloader.load("prettify_theme","/css/prettify/github-v2.min.css?AfzKxt++K+/lhZBlSjnxwg==",function(){if(typeof window.lsLoadCSSNums === "undefined")window.lsLoadCSSNums = 0;window.lsLoadCSSNums++;if(window.lsLoadCSSNums == window.lsLoadCSSMaxNums)document.documentElement.style.display="";}, false)</script>
<!-- Config CSS -->
<!-- Other Styles -->
<style>
body, html {
font-family: Roboto, "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
overflow-x: hidden !important;
}
code {
font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
}
a {
color: #00838F;
}
.mdl-card__media,
#search-label,
#search-form-label:after,
#scheme-Paradox .hot_tags-count,
#scheme-Paradox .sidebar_archives-count,
#scheme-Paradox .sidebar-colored .sidebar-header,
#scheme-Paradox .sidebar-colored .sidebar-badge{
background-color: #0097A7 !important;
}
/* Sidebar User Drop Down Menu Text Color */
#scheme-Paradox .sidebar-colored .sidebar-nav>.dropdown>.dropdown-menu>li>a:hover,
#scheme-Paradox .sidebar-colored .sidebar-nav>.dropdown>.dropdown-menu>li>a:focus {
color: #0097A7 !important;
}
#post_entry-right-info,
.sidebar-colored .sidebar-nav li:hover > a,
.sidebar-colored .sidebar-nav li:hover > a i,
.sidebar-colored .sidebar-nav li > a:hover,
.sidebar-colored .sidebar-nav li > a:hover i,
.sidebar-colored .sidebar-nav li > a:focus i,
.sidebar-colored .sidebar-nav > .open > a,
.sidebar-colored .sidebar-nav > .open > a:hover,
.sidebar-colored .sidebar-nav > .open > a:focus,
#ds-reset #ds-ctx .ds-ctx-entry .ds-ctx-head a {
color: #0097A7 !important;
}
.toTop {
background: #757575 !important;
}
.material-layout .material-post>.material-nav,
.material-layout .material-index>.material-nav,
.material-nav a {
color: #757575;
}
#scheme-Paradox .MD-burger-layer {
background-color: #757575;
}
#scheme-Paradox #post-toc-trigger-btn {
color: #757575;
}
.post-toc a:hover {
color: #00838F;
text-decoration: underline;
}
</style>
<!-- Theme Background Related-->
<style>
body {
background-color: undefined;
}
/* blog_info bottom background */
#scheme-Paradox .material-layout .something-else .mdl-card__supporting-text {
background-color: #fff;
}
</style>
<!-- Fade Effect -->
<style>
.fade {
transition: all 800ms linear;
-webkit-transform: translate3d(0,0,0);
-moz-transform: translate3d(0,0,0);
-ms-transform: translate3d(0,0,0);
-o-transform: translate3d(0,0,0);
transform: translate3d(0,0,0);
opacity: 1;
}
.fade.out{
opacity: 0;
}
</style>
<!-- Import Font -->
<!-- Import Roboto -->
<style>
@font-face {
font-family: Roboto;
font-style: normal;
font-weight: 300;
src: url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-300.eot);
src: local('Roboto'),local('Roboto-Normal'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-300.eot?#iefix) format('embedded-opentype'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-300.woff2) format('woff2'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-300.woff) format('woff'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-300.ttf) format('truetype'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-300.svg#Roboto) format('svg')
}
@font-face {
font-family: Roboto;
font-style: normal;
font-weight: regular;
src: url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-regular.eot);
src: local('Roboto'),local('Roboto-Normal'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-regular.eot?#iefix) format('embedded-opentype'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-regular.woff2) format('woff2'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-regular.woff) format('woff'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-regular.ttf) format('truetype'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-regular.svg#Roboto) format('svg')
}
@font-face {
font-family: Roboto;
font-style: normal;
font-weight: 500;
src: url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-500.eot);
src: local('Roboto'),local('Roboto-Normal'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-500.eot?#iefix) format('embedded-opentype'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-500.woff2) format('woff2'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-500.woff) format('woff'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-500.ttf) format('truetype'),url(https://lib.baomitu.com/fonts/roboto/roboto-v15-latin-500.svg#Roboto) format('svg')
}
</style>
<!-- Import Material Icon -->
<link rel="stylesheet" href="//cdn.bootcss.com/material-design-icons/3.0.1/iconfont/material-icons.min.css">
<!-- Import jQuery -->
<script>lsloader.load("jq_js","https://cdn.bootcss.com/jquery/2.2.1/jquery.js", true)</script>
<!-- The Open Graph protocol -->
<meta property="og:url" content="https://yangshunjie.com">
<meta property="og:type" content="blog">
<meta property="og:title" content="ASP.NET Core 中的SEO优化（4）：自定义视图路径及主题切换 | ElderJames' Blog">
<meta property="og:image" content="https://yangshunjie.com/img/favicon.png" />
<meta property="og:description" content="学习、札记、分享">
<meta property="og:article:tag" content=".NET Core"> <meta property="og:article:tag" content="ASP.NET Core">
<meta property="article:published_time" content="Thu Nov 30 2017 21:44:19 GMT+0000" />
<meta property="article:modified_time" content="Fri Dec 15 2017 09:43:03 GMT+0000" />
<!-- The Twitter Card protocol -->
<meta name="twitter:title" content="ASP.NET Core 中的SEO优化（4）：自定义视图路径及主题切换 | ElderJames' Blog">
<meta name="twitter:description" content="学习、札记、分享">
<meta name="twitter:image" content="https://yangshunjie.com/img/favicon.png">
<meta name="twitter:card" content="summary_large_image" />
<meta name="twitter:url" content="https://yangshunjie.com" />
<!-- Add canonical link for SEO -->
<link rel="canonical" href="https://yangshunjie.com/Customized-View-Path-And-Theme-Switching-In-AspNetCore.html" />
<!-- Structured-data for SEO -->
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@type": "BlogPosting",
"mainEntityOfPage": "https://yangshunjie.com/Customized-View-Path-And-Theme-Switching-In-AspNetCore.html",
"headline": "ASP.NET Core 中的SEO优化（4）：自定义视图路径及主题切换",
"datePublished": "Thu Nov 30 2017 21:44:19 GMT+0000",
"dateModified": "Fri Dec 15 2017 09:43:03 GMT+0000",
"author": {
"@type": "Person",
"name": "James Yeung",
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<ol class="post-toc"><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#系列回顾"><span class="post-toc-number">1.</span> <span class="post-toc-text"><a href="#系列回顾" class="headerlink" title="系列回顾"></a>系列回顾</span></a></li><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#背景"><span class="post-toc-number">2.</span> <span class="post-toc-text"><a href="#背景" class="headerlink" title="背景"></a>背景</span></a></li><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#原理"><span class="post-toc-number">3.</span> <span class="post-toc-text"><a href="#原理" class="headerlink" title="原理"></a>原理</span></a></li><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#实现"><span class="post-toc-number">4.</span> <span class="post-toc-text"><a href="#实现" class="headerlink" title="实现"></a>实现</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#ASP-NET-MVC-实现"><span class="post-toc-number">4.0.1.</span> <span class="post-toc-text"><a href="#ASP-NET-MVC-实现" class="headerlink" title="ASP.NET MVC 实现"></a>ASP.NET MVC 实现</span></a></li><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#ASP-NET-Core-实现"><span class="post-toc-number">4.0.2.</span> <span class="post-toc-text"><a href="#ASP-NET-Core-实现" class="headerlink" title="ASP.NET Core 实现"></a>ASP.NET Core 实现</span></a></li></ol></li></ol></li><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#总结"><span class="post-toc-number">5.</span> <span class="post-toc-text"><a href="#总结" class="headerlink" title="总结"></a>总结</span></a></li></ol>
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ASP.NET Core 中的SEO优化（4）：自定义视图路径及主题切换
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<strong>James Yeung</strong>
<span>11月 30, 2017</span>
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<script src="\assets\js\APlayer.min.js"> </script><h2 id="系列回顾"><a href="#系列回顾" class="headerlink" title="系列回顾"></a>系列回顾</h2><ul>
<li><a href="A-Middleware-Implement-For-Server-Side-Static-Caching-In-AspNetCore.html">《ASP.NET Core 中的SEO优化（1）：中间件实现服务端静态化缓存》</a></li>
<li><a href="A-Middleware-Implement-For-Rendering-Razor-Views-In-AspNetCore.html">《ASP.NET Core 中的SEO优化（2）：中间件中渲染Razor视图》</a></li>
<li><a href="A-Middleware-Implement-For-Customized-Routing-In-AspNetCore.html">《ASP.NET Core 中的SEO优化（3）:自定义路由匹配和生成》</a></li>
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<h2 id="背景"><a href="#背景" class="headerlink" title="背景"></a>背景</h2><p>切换主题，是博客、CMS等系统的必备功能，一般来说，有三种切换主题的需求。</p>
<ol>
<li>在管理后台上传主题包，并选择主题</li>
<li>前端自动按照频道、栏目等切换模版</li>
<li>用户在前端切换主题，并记录用户的选择</li>
</ol>
<p>这三种需求，其实核心原理都是一样，就是制定一套主题的目录，切换主题等于切换目录名。主题内的页面模版都是按照一定的规则存放的。</p>
<p>下面是两个主题包的目录示例:</p>
<pre class="line-numbers language-shell"><code class="language-shell"> .
├── theme0
| ├── Assets
| | ├── js
| | ├── css
| | └── img
| ├── Home
| | ├── Index.cshtml
| | └── About.cshtml
| ├── Article
| | ├── Index.cshtml
| | └── Detail.cshtml
| └── Shared
| ├── Page.cshtml
| └── _Layout.cshtml
└── theme1
├── Assets
| ├── js
| ├── css
| └── img
├── Home
| ├── Index.cshtml
| └── About.cshtml
├── Article
| ├── Index.cshtml
| └── Detail.cshtml
└── Shared
├── Page.cshtml
└── _Layout.cshtml
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p> 大家一定注意到了，上面每个主题包里都按照传统ASP.NET MVC的约定来划分目录：控制器名为文件夹，操作名为视图文件。其实这里只是方便起见，按照接下来介绍的方法，是可以完全地自定义这个目录划分的。</p>
<h2 id="原理"><a href="#原理" class="headerlink" title="原理"></a>原理</h2><p>当ASP.NET MVC从控制器处理完数据返回视图的时候，ASP.NET MVC会按照默认的多个路径去查找文件，如果文件存在，则使用该文件渲染，如果不存在，则寻找下一个路径，比如默认的路径会有<code>/{Area}/{Controller}/{Action}.cshtml</code>、<code>/{Controller}/{Action}.cshtml</code>、<code>/Shared/{Action}.cshtml</code>等等我们熟悉的约定，那么在查找视图文件时，会安装从左往右的路径去查询，如果都查询不出来，是会报错的。</p>
<p>而如果要做到切换主题文件夹名来切换主题，我们就需要在默认规则上加主题的目录占位符，使的查询时用主题文件夹名来替换占位符，例如<code>/{theme}/{Controller}/{Action}.cshtml</code>、<code>/{theme}/Shared/{Action}.cshtml</code>等等，这样，当查询视图文件时，就能匹配到对应的主题文件夹，并且找到相应的视图了。</p>
<p>总结起来，切换主题功能有两个重点需要我们去实现:</p>
<ol>
<li>在原有规则中加入占位符</li>
<li>每次请求都获取当前的主题名，并改变视图查询路径</li>
</ol>
<h2 id="实现"><a href="#实现" class="headerlink" title="实现"></a>实现</h2><p>最简单的实现，在操作（action）的最后<code>return View(viewPath)</code>时传入视图路径，直接就能指向对应视图，但是，这样做一点都不灵活，而且每个操作都要传路径也是不够简洁，不容易维护，所以我们需要更好的解决方案。</p>
<h4 id="ASP-NET-MVC-实现"><a href="#ASP-NET-MVC-实现" class="headerlink" title="ASP.NET MVC 实现"></a>ASP.NET MVC 实现</h4><p>在ASP.NET MVC时代，我们可通过继承RazorViewEngine类，在基类的<code>ViewLocationFormats</code>和<code>PartialViewLocationFormats</code>两个属性中加入有主题目录名占位符的路径，并重写<code>CreateView</code>、<code>CreatePartialView</code>、<code>FileExists</code>三个方法，使每次请求都能获取最新的主题名，如下面的例子中从路由数据对象中获取主题名：</p>
<pre class="line-numbers language-csharp"><code class="language-csharp"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">TemplateViewEngine</span> <span class="token punctuation">:</span> RazorViewEngine
<span class="token punctuation">{</span>
<span class="token keyword">public</span> <span class="token function">TemplateViewEngine</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">:</span> <span class="token keyword">base</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
ViewLocationFormats <span class="token operator">=</span> <span class="token keyword">new</span><span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token punctuation">{</span>
<span class="token string">"~/Views/{1}%1/{0}.cshtml"</span><span class="token punctuation">,</span>
<span class="token string">"~/Views/{1}/{0}.cshtml"</span><span class="token punctuation">,</span><span class="token comment" spellcheck="true">//默认路径</span>
<span class="token string">"~/Views/Shared%1/{0}.cshtml"</span><span class="token punctuation">,</span>
<span class="token string">"~/Views/Shared/{0}.cshtml"</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
PartialViewLocationFormats <span class="token operator">=</span> <span class="token keyword">new</span><span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token punctuation">{</span>
<span class="token string">"~/Views/{1}%1/{0}.cshtml"</span><span class="token punctuation">,</span>
<span class="token string">"~/Views/{1}/{0}.cshtml"</span><span class="token punctuation">,</span><span class="token comment" spellcheck="true">//默认路径</span>
<span class="token string">"~/Views/Shared%1/{0}.cshtml"</span><span class="token punctuation">,</span>
<span class="token string">"~/Views/Shared/{0}.cshtml"</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">protected</span> <span class="token keyword">override</span> IView <span class="token function">CreatePartialView</span><span class="token punctuation">(</span>ControllerContext controllerContext<span class="token punctuation">,</span> <span class="token keyword">string</span> partialPath<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">var</span> template <span class="token operator">=</span> controllerContext<span class="token punctuation">.</span>RouteData<span class="token punctuation">.</span>Values<span class="token punctuation">[</span><span class="token string">"template"</span><span class="token punctuation">]</span> <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">?</span> <span class="token string">"/"</span> <span class="token operator">+</span> controllerContext<span class="token punctuation">.</span>RouteData<span class="token punctuation">.</span>Values<span class="token punctuation">[</span><span class="token string">"template"</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">ToString</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">:</span> <span class="token string">""</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token keyword">base</span><span class="token punctuation">.</span><span class="token function">CreatePartialView</span><span class="token punctuation">(</span>controllerContext<span class="token punctuation">,</span> partialPath<span class="token punctuation">.</span><span class="token function">Replace</span><span class="token punctuation">(</span><span class="token string">"%1"</span><span class="token punctuation">,</span> template<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">protected</span> <span class="token keyword">override</span> IView <span class="token function">CreateView</span><span class="token punctuation">(</span>ControllerContext controllerContext<span class="token punctuation">,</span> <span class="token keyword">string</span> viewPath<span class="token punctuation">,</span> <span class="token keyword">string</span> masterPath<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">var</span> template <span class="token operator">=</span> controllerContext<span class="token punctuation">.</span>RouteData<span class="token punctuation">.</span>Values<span class="token punctuation">[</span><span class="token string">"template"</span><span class="token punctuation">]</span> <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">?</span> <span class="token string">"/"</span> <span class="token operator">+</span> controllerContext<span class="token punctuation">.</span>RouteData<span class="token punctuation">.</span>Values<span class="token punctuation">[</span><span class="token string">"template"</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">ToString</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">:</span> <span class="token string">""</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token keyword">base</span><span class="token punctuation">.</span><span class="token function">CreateView</span><span class="token punctuation">(</span>controllerContext<span class="token punctuation">,</span> viewPath<span class="token punctuation">.</span><span class="token function">Replace</span><span class="token punctuation">(</span><span class="token string">"%1"</span><span class="token punctuation">,</span> template<span class="token punctuation">)</span><span class="token punctuation">,</span> masterPath<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">protected</span> <span class="token keyword">override</span> <span class="token keyword">bool</span> <span class="token function">FileExists</span><span class="token punctuation">(</span>ControllerContext controllerContext<span class="token punctuation">,</span> <span class="token keyword">string</span> virtualPath<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">var</span> template <span class="token operator">=</span> controllerContext<span class="token punctuation">.</span>RouteData<span class="token punctuation">.</span>Values<span class="token punctuation">[</span><span class="token string">"template"</span><span class="token punctuation">]</span> <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">?</span> <span class="token string">"/"</span> <span class="token operator">+</span> controllerContext<span class="token punctuation">.</span>RouteData<span class="token punctuation">.</span>Values<span class="token punctuation">[</span><span class="token string">"template"</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">ToString</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">:</span> <span class="token string">""</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token keyword">base</span><span class="token punctuation">.</span><span class="token function">FileExists</span><span class="token punctuation">(</span>controllerContext<span class="token punctuation">,</span> virtualPath<span class="token punctuation">.</span><span class="token function">Replace</span><span class="token punctuation">(</span><span class="token string">"%1"</span><span class="token punctuation">,</span> template<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>事实上，如果是需要实现不同用户不同主题的功能，主题信息可以存储在Session中，还能从<code>controllerContext</code>实例获取<code>Session</code>中存储的主题名。</p>
<p>那么，在ASP.NET Core中如何实现呢？</p>
<h4 id="ASP-NET-Core-实现"><a href="#ASP-NET-Core-实现" class="headerlink" title="ASP.NET Core 实现"></a>ASP.NET Core 实现</h4><p>ASP.NET Core 相比ASP.NET MVC框架，虽然使用上为了开发者平滑过渡，很多约定都相同，但是架构本身是做了翻天覆地的重构和优化，得益于一脉相承的MSDI框架，ASP.NET Core框架实现了组件化，很多功能都通过IoC的方式修改或扩展。例如本文介绍的主题情况功能，就是实现<code>IViewLocationExpander</code>接口来达到扩展配置的目的，而且还比ASP.NET MVC的更加简洁：</p>
<pre class="line-numbers language-csharp"><code class="language-csharp"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">TemplateViewLocationExpander</span> <span class="token punctuation">:</span> IViewLocationExpander
<span class="token punctuation">{</span>
<span class="token keyword">public</span> IEnumerable<span class="token operator"><</span><span class="token keyword">string</span><span class="token operator">></span> <span class="token function">ExpandViewLocations</span><span class="token punctuation">(</span>ViewLocationExpanderContext context<span class="token punctuation">,</span> IEnumerable<span class="token operator"><</span><span class="token keyword">string</span><span class="token operator">></span> viewLocations<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">var</span> template <span class="token operator">=</span> context<span class="token punctuation">.</span>Values<span class="token punctuation">[</span><span class="token string">"template"</span><span class="token punctuation">]</span> <span class="token operator">?</span><span class="token operator">?</span> <span class="token string">"Default"</span><span class="token punctuation">;</span>
<span class="token keyword">string</span><span class="token punctuation">[</span><span class="token punctuation">]</span> locations <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token string">"/Views/"</span> <span class="token operator">+</span> template <span class="token operator">+</span> <span class="token string">"/{1}/{0}.cshtml"</span><span class="token punctuation">,</span> <span class="token string">"/Views/"</span> <span class="token operator">+</span> template <span class="token operator">+</span> <span class="token string">"/{0}.cshtml"</span><span class="token punctuation">,</span> <span class="token string">"/Views/"</span> <span class="token operator">+</span> template <span class="token operator">+</span> <span class="token string">"/Shared/{0}.cshtml"</span> <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> locations<span class="token punctuation">.</span><span class="token function">Union</span><span class="token punctuation">(</span>viewLocations<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">PopulateValues</span><span class="token punctuation">(</span>ViewLocationExpanderContext context<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
context<span class="token punctuation">.</span>Values<span class="token punctuation">[</span><span class="token string">"template"</span><span class="token punctuation">]</span> <span class="token operator">=</span> context<span class="token punctuation">.</span>ActionContext<span class="token punctuation">.</span>RouteData<span class="token punctuation">.</span>Values<span class="token punctuation">[</span><span class="token string">"Template"</span><span class="token punctuation">]</span><span class="token operator">?</span><span class="token punctuation">.</span><span class="token function">ToString</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">?</span><span class="token operator">?</span> <span class="token string">"Default"</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>这个接口里面，<code>PopulateValues</code>方法主要用来获取实时的主题信息，<code>context.ActionContext</code>中除了<code>RouteData</code>可获得实时数据，还有<code>HttpContext</code>实例可获得用户信息，甚至能利用<code>RequestServices</code>实例注入服务。而只有在<code>PopulateValues</code>中修改了<code>context</code>，<code>ExpandViewLocations</code>方法才会从<code>context</code>中获得主题信息，从而达到修改视图查找路径的目的。</p>
<p>当我们实现了<code>IViewLocationExpander</code>接口后，还需要在<code>Startup</code>类的<code>services.AddMvc();</code>下修改MVC的配置:</p>
<pre class="line-numbers language-csharp"><code class="language-csharp">services<span class="token punctuation">.</span><span class="token function">AddMvc</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment" spellcheck="true">//配置模版视图路径</span>
services<span class="token punctuation">.</span><span class="token generic-method function">Configure<span class="token punctuation"><</span>RazorViewEngineOptions<span class="token punctuation">></span></span><span class="token punctuation">(</span>options <span class="token operator">=</span><span class="token operator">></span>
<span class="token punctuation">{</span>
options<span class="token punctuation">.</span>ViewLocationExpanders<span class="token punctuation">.</span><span class="token function">Add</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">TemplateViewLocationExpander</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p><em>PS:这种修改MVC内部配置的方式很有趣，以后有空会研究一番。</em></p>
<h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><p>本文主要介绍了在ASP.NET Core中利用修改视图查询路径实现主题切换的功能，虽然只介绍了核心部分，但是其它部分如管理主题、前端切换等功能，都是很容易实现的，以后我会在我的框架样例中实现，敬请大家关注啦！</p>
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lsloader.runInlineScript(item.id,item.id);
}
})()
console.log('\n %c © Material Theme | Version: 1.5.0 | https://github.com/viosey/hexo-theme-material %c \n', 'color:#455a64;background:#e0e0e0;padding:5px 0;border-top-left-radius:5px;border-bottom-left-radius:5px;', 'color:#455a64;background:#e0e0e0;padding:5px 0;border-top-right-radius:5px;border-bottom-right-radius:5px;');
</script>
</main>
</div>
<div id="hexo-helper-live2d">
<canvas id="live2dcanvas" width="150" height="300"></canvas>
</div>
<style>
#live2dcanvas{
position: fixed;
width: 150px;
height: 300px;
opacity:0.7;
right: 0px;
z-index: 999;
pointer-events: none;
bottom: 60px;
}
</style>
<script type="text/javascript" src="/live2d/device.min.js"></script>
<script type="text/javascript">
const loadScript = function loadScript(c,b){var a=document.createElement("script");a.type="text/javascript";"undefined"!=typeof b&&(a.readyState?a.onreadystatechange=function(){if("loaded"==a.readyState||"complete"==a.readyState)a.onreadystatechange=null,b()}:a.onload=function(){b()});a.src=c;document.body.appendChild(a)};
(function(){
if((typeof(device) != 'undefined') && (device.mobile())){
document.getElementById("live2dcanvas").style.width = '75px';
document.getElementById("live2dcanvas").style.height = '150px';
}else
if (typeof(device) === 'undefined') console.error('Cannot find current-device script.');
loadScript("/live2d/script.js", function(){loadlive2d("live2dcanvas", "/live2d/assets/tororo.model.json", 0.5);});
})();
</script>
</body>
</html>
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