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<p>提供基本语法和方法的 C# 快速参考备忘单</p>
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</div></header><div class="menu-tocs"><div class="menu-btn"><svg aria-hidden="true" fill="currentColor" height="1em" width="1em" viewBox="0 0 16 16" version="1.1" data-view-component="true">
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<path fill-rule="evenodd" d="M2 4a1 1 0 100-2 1 1 0 000 2zm3.75-1.5a.75.75 0 000 1.5h8.5a.75.75 0 000-1.5h-8.5zm0 5a.75.75 0 000 1.5h8.5a.75.75 0 000-1.5h-8.5zm0 5a.75.75 0 000 1.5h8.5a.75.75 0 000-1.5h-8.5zM3 8a1 1 0 11-2 0 1 1 0 012 0zm-1 6a1 1 0 100-2 1 1 0 000 2z"></path>
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</svg></div><div class="menu-modal"><a aria-hidden="true" class="leve2 tocs-link" href="#入门">入门</a><a aria-hidden="true" class="leve3 tocs-link" href="#hellocs">Hello.cs</a><a aria-hidden="true" class="leve3 tocs-link" href="#变量">变量</a><a aria-hidden="true" class="leve3 tocs-link" href="#原始数据类型">原始数据类型</a><a aria-hidden="true" class="leve3 tocs-link" href="#注释">注释</a><a aria-hidden="true" class="leve3 tocs-link" href="#strings">Strings</a><a aria-hidden="true" class="leve3 tocs-link" href="#user-input">User Input</a><a aria-hidden="true" class="leve3 tocs-link" href="#条件句">条件句</a><a aria-hidden="true" class="leve3 tocs-link" href="#数组">数组</a><a aria-hidden="true" class="leve3 tocs-link" href="#循环">循环</a><a aria-hidden="true" class="leve2 tocs-link" href="#c-字符串">C# 字符串</a><a aria-hidden="true" class="leve3 tocs-link" href="#字符串连接">字符串连接</a><a aria-hidden="true" class="leve3 tocs-link" href="#字符串插值">字符串插值</a><a aria-hidden="true" class="leve3 tocs-link" href="#字符串成员">字符串成员</a><a aria-hidden="true" class="leve3 tocs-link" href="#逐字字符串">逐字字符串</a><a aria-hidden="true" class="leve3 tocs-link" href="#成员示例">成员示例</a><a aria-hidden="true" class="leve2 tocs-link" href="#杂项">杂项</a><a aria-hidden="true" class="leve3 tocs-link" href="#一般-net-条款">一般 .NET 条款</a></div></div><div class="h1wrap-body"><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="入门"><a aria-hidden="true" tabindex="-1" href="#入门"><span class="icon icon-link"></span></a>入门</h2><div class="wrap-body">
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</svg></div><div class="menu-modal"><a aria-hidden="true" class="leve2 tocs-link" href="#入门">入门</a><a aria-hidden="true" class="leve3 tocs-link" href="#hellocs">Hello.cs</a><a aria-hidden="true" class="leve3 tocs-link" href="#变量">变量</a><a aria-hidden="true" class="leve3 tocs-link" href="#原始数据类型">原始数据类型</a><a aria-hidden="true" class="leve3 tocs-link" href="#注释">注释</a><a aria-hidden="true" class="leve3 tocs-link" href="#strings">Strings</a><a aria-hidden="true" class="leve3 tocs-link" href="#user-input">User Input</a><a aria-hidden="true" class="leve3 tocs-link" href="#条件句">条件句</a><a aria-hidden="true" class="leve3 tocs-link" href="#数组">数组</a><a aria-hidden="true" class="leve3 tocs-link" href="#循环">循环</a><a aria-hidden="true" class="leve2 tocs-link" href="#c-字符串">C# 字符串</a><a aria-hidden="true" class="leve3 tocs-link" href="#字符串连接">字符串连接</a><a aria-hidden="true" class="leve3 tocs-link" href="#字符串插值">字符串插值</a><a aria-hidden="true" class="leve3 tocs-link" href="#字符串成员">字符串成员</a><a aria-hidden="true" class="leve3 tocs-link" href="#逐字字符串">逐字字符串</a><a aria-hidden="true" class="leve3 tocs-link" href="#成员示例">成员示例</a><a aria-hidden="true" class="leve3 tocs-link" href="#频繁字符串拼接">频繁字符串拼接</a><a aria-hidden="true" class="leve3 tocs-link" href="#原始字符串文本">原始字符串文本</a><a aria-hidden="true" class="leve2 tocs-link" href="#杂项">杂项</a><a aria-hidden="true" class="leve3 tocs-link" href="#一般-net-条款">一般 .NET 条款</a></div></div><div class="h1wrap-body"><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="入门"><a aria-hidden="true" tabindex="-1" href="#入门"><span class="icon icon-link"></span></a>入门</h2><div class="wrap-body">
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</div></div><div class="h2wrap-body"><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="hellocs"><a aria-hidden="true" tabindex="-1" href="#hellocs"><span class="icon icon-link"></span></a>Hello.cs</h3><div class="wrap-body">
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<pre class="language-cs"><code class="language-cs code-highlight"><span class="code-line"><span class="token keyword">class</span> <span class="token class-name">Hello</span> <span class="token punctuation">{</span>
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</span><span class="code-line"> <span class="token comment">// main method</span>
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</span><span class="code-line"><span class="token comment">// 使用 System.String 的方法</span>
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</span><span class="code-line">lengthOfString<span class="token punctuation">.</span><span class="token function">Contains</span><span class="token punctuation">(</span><span class="token string">"How"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// => true</span>
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</span></code></pre>
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</div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="频繁字符串拼接"><a aria-hidden="true" tabindex="-1" href="#频繁字符串拼接"><span class="icon icon-link"></span></a>频繁字符串拼接</h3><div class="wrap-body">
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<pre class="wrap-text"><code class="language-cs code-highlight"><span class="code-line"><span class="token comment">// 对于频繁拼接字符串的场景（如：成百上千次循环）</span>
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</span><span class="code-line"><span class="token comment">// 使用 System.Text.StringBuilder 提升性能</span>
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</span><span class="code-line"><span class="token class-name"><span class="token keyword">var</span></span> sb <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token constructor-invocation class-name">StringBuilder</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</span><span class="code-line"><span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name"><span class="token keyword">int</span></span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">100</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span>
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</span><span class="code-line"><span class="token punctuation">{</span>
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</span><span class="code-line"> sb<span class="token punctuation">.</span><span class="token function">Append</span><span class="token punctuation">(</span>i<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 punctuation">;</span>
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</span><span class="code-line"><span class="token punctuation">}</span>
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</span><span class="code-line">Console<span class="token punctuation">.</span><span class="token function">WriteLine</span><span class="token punctuation">(</span>sb<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 punctuation">;</span> <span class="token comment">// => 123456789....</span>
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</span></code></pre>
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<!--rehype:className=wrap-text-->
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</div></div></div><div class="wrap h3body-not-exist col-span-2"><div class="wrap-header h3wrap"><h3 id="原始字符串文本"><a aria-hidden="true" tabindex="-1" href="#原始字符串文本"><span class="icon icon-link"></span></a>原始字符串文本</h3><div class="wrap-body">
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<!--rehype:wrap-class=col-span-2-->
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<pre class="wrap-text"><code class="language-cs code-highlight"><span class="code-line"><span class="token comment">// C#11 语法, 至少3个双引号(""")开头和结尾，内容可以输入任何原始字符</span>
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</span><span class="code-line"><span class="token comment">// 单行: 左引号，右引号，内容 三者同行</span>
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</span><span class="code-line"><span class="token class-name"><span class="token keyword">string</span></span> singleLine <span class="token operator">=</span> <span class="token string">""</span>"Content begin <span class="token string">"Hello World!"</span> end<span class="token punctuation">.</span><span class="token string">""</span>"<span class="token punctuation">;</span>
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</span><span class="code-line">
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</span><span class="code-line"><span class="token comment">// 多行：左引号，右引号各一行，内容需与右引号缩进对齐</span>
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</span><span class="code-line"><span class="token class-name"><span class="token keyword">string</span></span> multiLine <span class="token operator">=</span> <span class="token string">""</span>"
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</span><span class="code-line"> Content begin <span class="token string">"Hello World!"</span> <span class="token operator">/</span>\n<span class="token operator"><</span><span class="token operator">></span><span class="token string">""</span> end<span class="token punctuation">.</span>
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</span><span class="code-line"> <span class="token string">""</span>"<span class="token punctuation">;</span>
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</span><span class="code-line">Console<span class="token punctuation">.</span><span class="token function">WriteLine</span><span class="token punctuation">(</span>multiLine<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// => Content begin "Hello World!" /\n<>"" end.</span>
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</span></code></pre>
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<!--rehype:className=wrap-text-->
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</div></div></div></div></div><div class="wrap h2body-exist"><div class="wrap-header h2wrap"><h2 id="杂项"><a aria-hidden="true" tabindex="-1" href="#杂项"><span class="icon icon-link"></span></a>杂项</h2><div class="wrap-body">
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</div></div><div class="h2wrap-body"><div class="wrap h3body-not-exist col-span-2"><div class="wrap-header h3wrap"><h3 id="一般-net-条款"><a aria-hidden="true" tabindex="-1" href="#一般-net-条款"><span class="icon icon-link"></span></a>一般 .NET 条款</h3><div class="wrap-body">
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<!--rehype:wrap-class=col-span-2-->
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