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<title data-rh="true">7. GlobalUsings 的使用 | Furion</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="http://furion.baiqian.ltd/blog/global-usings"><meta data-rh="true" property="og:locale" content="en"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docusaurus_tag" content="default"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docsearch:docusaurus_tag" content="default"><meta data-rh="true" property="og:title" content="7. GlobalUsings 的使用 | Furion"><meta data-rh="true" name="description" content="简介"><meta data-rh="true" property="og:description" content="简介"><meta data-rh="true" property="og:type" content="article"><meta data-rh="true" property="article:published_time" content="2022-05-31T00:00:00.000Z"><meta data-rh="true" property="article:author" content="https://gitee.com/dotnetchina"><meta data-rh="true" property="article:tag" content="furion,furos,.net,.netcore,.net5,.net6"><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="http://furion.baiqian.ltd/blog/global-usings"><link data-rh="true" rel="alternate" href="http://furion.baiqian.ltd/blog/global-usings" hreflang="en"><link data-rh="true" rel="alternate" href="http://furion.baiqian.ltd/blog/global-usings" hreflang="x-default"><link rel="alternate" type="application/rss+xml" href="/blog/rss.xml" title="Furion RSS Feed">
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<p>在 <code>.NET6/C#10</code> 之后，微软新增了 <code>GlobalUsings</code> 机制，可以在项目的根目录下创建一个 <code>GlobalUsings.cs</code> 文件，把常用的 <code>using</code> 放置其中。</p>
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<p>这样 <code>GlobalUsings.cs</code> 所在的项目 <code>.cs</code> 文件就无需重复 <code>using</code> 了，大大的提高开发效率，也让代码变的更加简洁。</p>
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<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="必要配置">必要配置<a href="#必要配置" class="hash-link" aria-label="Direct link to 必要配置" title="Direct link to 必要配置"></a></h3>
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<p><strong>启用 <code>GlobalUsings</code> 机制需要以下两个步 骤：</strong></p>
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<ol>
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<li>在你需要全局 <code>using</code> 的项目层根目录创建 <code>GlobalUsings.cs</code> 文件，如果多个项目层需要，则每个层都应该有一个 <code>GlobalUsings.cs</code></li>
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<li>编辑项目的 <code>.csproj</code> 文件，添加 <code><ImplicitUsings>enable</ImplicitUsings></code>，注意是在 <code><PropertyGroup></code> 中添加，通常和 <code><TargetFramework></code> 同父同级</li>
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</ol>
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<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="基本使用">基本使用<a href="#基本使用" class="hash-link" aria-label="Direct link to 基本使用" title="Direct link to 基本使用"></a></h3>
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<p>配置之后，现在就可以把常用的 <code>using</code> 放到 <code>GlobalUsings.cs</code> 中了，写法如下：</p>
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<div class="language-cs codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockTitle_Ktv7">Furion 推荐的全局命名空间</div><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 codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token keyword" style="font-style:italic">global</span><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)">Furion</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">global</span><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)">Furion</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">DatabaseAccessor</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">global</span><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)">Furion</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">DataEncryption</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">global</span><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)">Furion</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">DataValidation</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">global</span><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)">Furion</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">DependencyInjection</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"></spa
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<p><strong>注意必须以 <code>global</code> 开头！</strong></p>
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<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>小知识</div><div class="admonitionContent_BuS1"><p>一般推荐把实体类的命名空间也放进去，因为仓储 <code>IRepository<T></code> 使用的频率非常高。</p><p>另外推荐大家在 <code>Visual Studio</code> 中安装 <code>CodeMaid</code> 插件哦，自动清理解决方案所有无用的 <code>using</code>，结合 <code>GlobalUsings.cs</code> 非常棒！</p></div></div>
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<div class="theme-admonition theme-admonition-important admonition_xJq3 alert alert--info"><div class="admonitionHeading_Gvgb"><span class="admonitionIcon_Rf37"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>个别情况</div><div class="admonitionContent_BuS1"><p>可能由于 <code>Visual Studio</code> 版本的问题，导致 <code>GlobalUsings.cs</code> 定义出错，这时候需要在 <code>using</code> 后面加 <code>global::</code>，如：</p><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 codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token keyword" style="font-style:italic">global</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">using</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">global</span><span class="token punctuation" style="color:rgb(199, 146, 234)">::</span><span class="token plain">Furion</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></div></div>
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<p>接下来在代码中使用：</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 comment" style="color:rgb(105, 112, 152);font-style:italic">// 无需 using Furion 的命名空间了哦，清爽了不少</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)">Your</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">Application</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 keyword" style="font-style:italic">class</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">DefaultAppService</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)">IDynamicApiController</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">private</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">readonly</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">IRepository</span><span class="token class-name punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token class-name" style="color:rgb(255, 203, 107)">BoardCard</span><span class="token class-name punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"> _boardCardRepository</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">private</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">readonly</span><span class="
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<img src="/img/cd2223.png">
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<h3 class="anchor anchorWithHideOnScrollNavbar_WYt5" id="默认全局-using">默认全局 <code>using</code><a href="#默认全局-using" class="hash-link" aria-label="Direct link to 默认全局-using" title="Direct link to 默认全局-using"></a></h3>
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<p><strong>实际上微软已经自动把一些常用的 <code>using</code> 在编译后的代码中自动补上了</strong>，路径在 <code>项目/obj/Debug/net6.0/项目.GlobalUsings.cs</code> 文件中，文件内容如下：</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 codeLine_lJS_" style="color:#bfc7d5"><span class="codeLineNumber_Tfdd"></span><span class="codeLineContent_feaV"><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// <auto-generated/></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">global</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">using</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">global</span><span class="token punctuation" style="color:rgb(199, 146, 234)">::</span><span class="token plain">System</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">global</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">using</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">global</span><span class="token punctuation" style="color:rgb(199, 146, 234)">::</span><span class="token plain">System</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">Collections</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">Generic</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">global</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">using</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">global</span><span class="token punctuation" style="color:rgb(199, 146, 234)">::</span><span class="token plain">System</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">IO</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">global</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">using</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">global</span><span class="token punctuation" style="color:rgb(199, 146, 234)">::</span><span class="token plain">System</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">Linq</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">global</span><span class="token plain"> </span><span class="token
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<p><strong>也就是以上的 <code>using</code> 无需写在你创建的 <code>GlobalUsings.cs</code> 中了，微软会在编译时自动合并。</strong></p></div><footer class="row docusaurus-mt-lg blogPostFooterDetailsFull_mRVl"><div class="col"><b>Tags:</b><ul class="tags_jXut padding--none margin-left--sm"><li class="tag_QGVx"><a class="tag_zVej tagRegular_sFm0" href="/blog/tags/furion">furion</a></li><li class="tag_QGVx"><a class="tag_zVej tagRegular_sFm0" href="/blog/tags/furos">furos</a></li><li class="tag_QGVx"><a class="tag_zVej tagRegular_sFm0" href="/blog/tags/net">.net</a></li><li class="tag_QGVx"><a class="tag_zVej tagRegular_sFm0" href="/blog/tags/netcore">.netcore</a></li><li class="tag_QGVx"><a class="tag_zVej tagRegular_sFm0" href="/blog/tags/net-5">.net5</a></li><li class="tag_QGVx"><a class="tag_zVej tagRegular_sFm0" href="/blog/tags/net-6">.net6</a></li></ul></div><div class="col margin-top--sm"><a href="https://gitee.com/dotnetchina/Furion/tree/v4/handbook/blog/2022-05-31-global-usings.mdx" target="_blank" rel="noopener noreferrer" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Blog post page navigation"><a class="pagination-nav__link pagination-nav__link--next" href="/blog/net6-preview7"><div class="pagination-nav__sublabel">Older Post</div><div class="pagination-nav__label">6. .NET 6 Preview 7 尝鲜</div></a></nav></main><div class="col col--2"><div class="tableOfContents_jeP5 thin-scrollbar"><div style="margin:0.5em;display:block;border-bottom:1px solid #dedede;padding-bottom:0.2em;clear:both"><a href="https://www.crmeb.com/?from=furion" target="_blank" title="CRMEB 专注开源电商系统研发" style="display:block;position:relative;align-items:center;box-sizing:border-box;margin-bottom:0.5em;border:2px solid rgb(255, 176, 46)"><img src="/img/crmeb-right.jpg" style="display:block;width:100%" loading="lazy"><span style="position:absolute;z-index:10;top:-16px;right:-8px">👑</span><span style="position:absolute;display:block;right:0;bottom:0;z-index:5;font-size:12px;background-color:rgba(0,0,0,0.8);padding:0 5px">铂金</span></a></div><a href="https://gitee.com/dotnetchina" target="_blank" style="display:block;position:relative" title="了解 dotNET China 组织"><img src="/img/chinadotnet.png" style="display:block;width:90%;margin:0 auto"></a><ul class="table-of-contents table-of-contents__left-border"><li><a href="#简介" class="table-of-contents__link toc-highlight">简介</a></li><li><a href="#必要配置" class="table-of-contents__link toc-highlight">必要配置</a></li><li><a href="#基本使用" class="table-of-contents__link toc-highlight">基本使用</a></li><li><a href="#默认全局-using" class="table-of-contents__link toc-highlight">默认全局 <code>using</code></a></li></ul></div></div></div></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">文档</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/docs/category/getstart">入门</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/category/appendix">手册</a></li></ul></div><div class="col footer__col"><div class="footer__title">社区</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://gitee.com/dotnetchina/Furion/issues" target="_blank" rel="noopener noreferrer" class="footer__link-item">讨论<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 13v10h-21v-19h12v2h-10v15h17v-8h2zm3-12h-10.988l4.035 4-6.977 7.07 2.828 2.828 6.977-7.07 4.125 4.172v-11z"></path
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