ion">EmailAddress</span><span class="token punctuation">(</span>ErrorMessage <span class="token operator">=</span> <span class="token string">&quot;邮件格式不正确!&quot;</span><span class="token punctuation">)</span><span class="token punctuation">]</span>
    <span class="token keyword">public</span> <span class="token return-type class-name"><span class="token keyword">string</span><span class="token punctuation">?</span></span> Email <span class="token punctuation">{</span> <span class="token keyw