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<p>提供基本语法和方法的 C# 快速参考备忘单</p>
</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">
<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>
</svg></div><div class="menu-modal"><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#入门">入门</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#hellocs">Hello.cs</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#命名空间">命名空间</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#访问修饰符">访问修饰符</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#字符串">字符串</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#用户输入">用户输入</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#变量">变量</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#注释">注释</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#条件判断">条件判断</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#数组">数组</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#循环">循环</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#c-数据类型">C# 数据类型</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#原始数据类型">原始数据类型</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#基本数据类型">基本数据类型</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#c-字符串">C# 字符串</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#字符串连接">字符串连接</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#字符串插值">字符串插值</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#字符串成员">字符串成员</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#逐字字符串">逐字字符串</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#成员示例">成员示例</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#频繁字符串拼接">频繁字符串拼接</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#原始字符串文本">原始字符串文本</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#字符串操作">字符串操作</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#字符串分割">字符串分割</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#字符串截取">字符串截取</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#字符串替换">字符串替换</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#逻辑运算">逻辑运算</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#算术运算符">算术运算符</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#关系运算符">关系运算符</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#运算符优先级">运算符优先级</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#杂项">杂项</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#常用-net-概念">常用 .NET 概念</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">
</svg></div><div class="menu-modal"><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#入门">入门</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#hellocs">Hello.cs</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#命名空间">命名空间</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#访问修饰符">访问修饰符</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#字符串">字符串</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#用户输入">用户输入</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#变量">变量</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#注释">注释</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#条件判断">条件判断</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#数组">数组</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#循环">循环</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#c-数据类型">C# 数据类型</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#原始数据类型">原始数据类型</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#基本数据类型">基本数据类型</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#c-字符串">C# 字符串</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#字符串连接">字符串连接</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#字符串插值">字符串插值</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#字符串成员">字符串成员</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#逐字字符串">逐字字符串</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#成员示例">成员示例</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#频繁字符串拼接">频繁字符串拼接</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#原始字符串文本">原始字符串文本</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#字符串操作">字符串操作</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#字符串判空">字符串判空</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#字符串分割">字符串分割</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#字符串截取">字符串截取</a><a aria-hidden="true" class="leve4 tocs-link" data-num="4" href="#字符串替换">字符串替换</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#逻辑运算">逻辑运算</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#算术运算符">算术运算符</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#关系运算符">关系运算符</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#运算符优先级">运算符优先级</a><a aria-hidden="true" class="leve2 tocs-link" data-num="2" href="#杂项">杂项</a><a aria-hidden="true" class="leve3 tocs-link" data-num="3" href="#常用-net-概念">常用 .NET 概念</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">
</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">
<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>
</span><span class="code-line"> <span class="token comment">// main method</span>
@ -418,6 +418,14 @@
</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&#x3C;>"" end.</span>
</span></code></pre>
</div></div></div><div class="wrap h3body-exist"><div class="wrap-header h3wrap"><h3 id="字符串操作"><a aria-hidden="true" tabindex="-1" href="#字符串操作"><span class="icon icon-link"></span></a>字符串操作</h3><div class="wrap-body">
<h4 id="字符串判空"><a aria-hidden="true" tabindex="-1" href="#字符串判空"><span class="icon icon-link"></span></a>字符串判空</h4>
<pre class="language-cs"><code class="language-cs code-highlight"><span class="code-line"><span class="token class-name"><span class="token keyword">string</span></span> name<span class="token punctuation">;</span> <span class="token comment">//空引用</span>
</span><span class="code-line"><span class="token class-name"><span class="token keyword">string</span></span> gender <span class="token operator">=</span> <span class="token string">""</span><span class="token punctuation">;</span> <span class="token comment">//空值</span>
</span><span class="code-line">
</span><span class="code-line"><span class="token comment">// 使用 string.IsNullOrEmpty(字符串) 方法，返回 bool 型</span>
</span><span class="code-line">Console<span class="token punctuation">.</span><span class="token function">WriteLine</span><span class="token punctuation">(</span><span class="token keyword">string</span><span class="token punctuation">.</span><span class="token function">IsNullOrEmpty</span><span class="token punctuation">(</span>name<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//输出 true</span>
</span><span class="code-line">Console<span class="token punctuation">.</span><span class="token function">WriteLine</span><span class="token punctuation">(</span><span class="token keyword">string</span><span class="token punctuation">.</span><span class="token function">IsNullOrEmpty</span><span class="token punctuation">(</span>gender<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 输出 true</span>
</span></code></pre>
<h4 id="字符串分割"><a aria-hidden="true" tabindex="-1" href="#字符串分割"><span class="icon icon-link"></span></a>字符串分割</h4>
<pre class="language-cs"><code class="language-cs code-highlight"><span class="code-line"><span class="token class-name"><span class="token keyword">string</span></span> Name <span class="token operator">=</span> <span class="token string">"字A符A串A分A割"</span><span class="token punctuation">;</span>
</span><span class="code-line"><span class="token class-name"><span class="token keyword">string</span><span class="token punctuation">[</span><span class="token punctuation">]</span></span> Names<span class="token operator">=</span>Name<span class="token punctuation">.</span><span class="token function">Split</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token constructor-invocation class-name"><span class="token keyword">char</span><span class="token punctuation">[</span><span class="token punctuation">]</span></span> <span class="token punctuation">{</span> <span class="token char">'A'</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>