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使用HtmlAgillityPack解析HTML阅读选项标记内容

我正在尝试使用HtmlAgilityPack来解析HTML,但是遇到了问题.

示例HTML文档:

<tr>
  <td class="css_lokalita" colspan="4">
    <select id="region" name="region">
      <option value="0"  selected>Všetky regiony</option>
      <optgroup>Banskobystrický kraj</optgroup>
      <option value="k_1"  style="color: #000000; font-weight:bold;">Banskobystrický kraj</option>
      <option value="1">&nbsp;&nbsp;&nbsp;Banská Bystrica</option>
          .
          .
          .
      <option value="174">&nbsp;&nbsp;&nbsp;CZ - Ústecký kraj</option>
      <option value="175">&nbsp;&nbsp;&nbsp;CZ - Zlínský kraj</option>     
    </select>
  </td>
</tr>

<tr>
  <td class="css_sfotkou"  colspan="4">
    <input type="checkbox" name="foto" value="1" id="foto" />
    <label for="foto">Iba používatelia s fotkou</label>
  </td>
</tr>

<tr>
  <td class="css_miestnost" colspan="4">
    <select name="akt-miest" id="onoffaci">
      <option value="a_0">Všetci</option>
          .
          .
          .
      <optgroup label="Zá?uby a záujmy">
        <option value="m_1419307">&nbsp;&nbsp;&nbsp;Bez Lásky</option>
          .
          .
          .
        <option …
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html select xpath html-agility-pack

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