我怎么能检查这个标题是否存在？

Question

我正在尝试检查我的xml文件中是否存在HeaderReportUnit，我如何检查此Header是否存在？ 我正在使用2.0程序集，非常感谢您的帮助

 <?xml version="1.0" encoding="UTF-8" ?> 
- <HeadReportUnit>
- <Title>
  <ModuleNum>ModuleNum</ModuleNum> 
  <hdstSetPos>hdstSetPos</hdstSetPos> 
  <hdstNzlName>hdstNzlName</hdstNzlName> 
  <nzavSpecName>nzavSpecName</nzavSpecName> 
  <nzavNzlDiameter>nzavNzlDiameter</nzavNzlDiameter> 
  <nzavNzlSizeX>nzavNzlSizeX</nzavNzlSizeX> 
  <nzavNzlSizeY>nzavNzlSizeY</nzavNzlSizeY> 
  <nzavNzlType2>nzavNzlType2</nzavNzlType2> 
  </Title>
- <Unit>
  <ModuleNum>1</ModuleNum> 
  <hdstSetPos>1- 1</hdstSetPos> 
  <hdstNzlName>R07-007-070</hdstNzlName> 
  <nzavSpecName>AA05700</nzavSpecName> 
  <nzavNzlDiameter>0.0</nzavNzlDiameter> 
  <nzavNzlSizeX>0.7</nzavNzlSizeX> 
  <nzavNzlSizeY>0.6</nzavNzlSizeY> 
  <nzavNzlType2>Standard</nzavNzlType2> 
  </Unit>
- <Unit>
  <ModuleNum>1</ModuleNum> 
  <hdstSetPos>1- 2</hdstSetPos> 
  <hdstNzlName>R07-007-070</hdstNzlName> 
  <nzavSpecName>AA05700</nzavSpecName> 
  <nzavNzlDiameter>0.0</nzavNzlDiameter> 
  <nzavNzlSizeX>0.7</nzavNzlSizeX> 
  <nzavNzlSizeY>0.6</nzavNzlSizeY> 
  <nzavNzlType2>Standard</nzavNzlType2> 
  </Unit>
- <Unit>
  <ModuleNum>1</ModuleNum> 
  <hdstSetPos>1- 3</hdstSetPos> 
  <hdstNzlName>R07-007-070</hdstNzlName> 
  <nzavSpecName>AA05700</nzavSpecName> 
  <nzavNzlDiameter>0.0</nzavNzlDiameter> 
  <nzavNzlSizeX>0.7</nzavNzlSizeX> 
  <nzavNzlSizeY>0.6</nzavNzlSizeY> 
  <nzavNzlType2>Standard</nzavNzlType2> 
  </Unit>
- <Unit>
  <ModuleNum>1</ModuleNum> 
  <hdstSetPos>1- 4</hdstSetPos> 
  <hdstNzlName>R07-007-070</hdstNzlName> 
  <nzavSpecName>AA05700</nzavSpecName> 
  <nzavNzlDiameter>0.0</nzavNzlDiameter> 
  <nzavNzlSizeX>0.7</nzavNzlSizeX> 
  <nzavNzlSizeY>0.6</nzavNzlSizeY> 
  <nzavNzlType2>Standard</nzavNzlType2> 
  </Unit>
- <Unit>
  <ModuleNum>1</ModuleNum> 
  <hdstSetPos>1- 5</hdstSetPos> 
  <hdstNzlName>R07-007-070</hdstNzlName> 
  <nzavSpecName>AA05700</nzavSpecName> 
  <nzavNzlDiameter>0.0</nzavNzlDiameter> 
  <nzavNzlSizeX>0.7</nzavNzlSizeX> 
  <nzavNzlSizeY>0.6</nzavNzlSizeY> 
  <nzavNzlType2>Standard</nzavNzlType2> 
  </Unit>
- <Unit>
  <ModuleNum>1</ModuleNum> 
  <hdstSetPos>1- 6</hdstSetPos> 
  <hdstNzlName>R07-007-070</hdstNzlName> 
  <nzavSpecName>AA05700</nzavSpecName> 
  <nzavNzlDiameter>0.0</nzavNzlDiameter> 
  <nzavNzlSizeX>0.7</nzavNzlSizeX> 
  <nzavNzlSizeY>0.6</nzavNzlSizeY> 
  <nzavNzlType2>Standard</nzavNzlType2> 
  </Unit>
- <Unit>
  <ModuleNum>1</ModuleNum> 
  <hdstSetPos>1- 7</hdstSetPos> 
  <hdstNzlName>R07-007-070</hdstNzlName> 
  <nzavSpecName>AA05700</nzavSpecName> 
  <nzavNzlDiameter>0.0</nzavNzlDiameter> 
  <nzavNzlSizeX>0.7</nzavNzlSizeX> 
  <nzavNzlSizeY>0.6</nzavNzlSizeY> 
  <nzavNzlType2>Standard</nzavNzlType2> 
  </Unit>
- <Unit>
  <ModuleNum>1</ModuleNum> 
  <hdstSetPos>1- 8</hdstSetPos> 
  <hdstNzlName>R07-007-070</hdstNzlName> 
  <nzavSpecName>AA05700</nzavSpecName> 
  <nzavNzlDiameter>0.0</nzavNzlDiameter> 
  <nzavNzlSizeX>0.7</nzavNzlSizeX> 
  <nzavNzlSizeY>0.6</nzavNzlSizeY> 
  <nzavNzlType2>Standard</nzavNzlType2> 
  </Unit>
- <Unit>
  <ModuleNum>1</ModuleNum> 
  <hdstSetPos>1- 9</hdstSetPos> 
  <hdstNzlName>R07-007-070</hdstNzlName> 
  <nzavSpecName>AA05700</nzavSpecName> 
  <nzavNzlDiameter>0.0</nzavNzlDiameter> 
  <nzavNzlSizeX>0.7</nzavNzlSizeX> 
  <nzavNzlSizeY>0.6</nzavNzlSizeY> 
  <nzavNzlType2>Standard</nzavNzlType2> 
  </Unit>
- <Unit>
  <ModuleNum>1</ModuleNum> 
  <hdstSetPos>1- 10</hdstSetPos> 
  <hdstNzlName>R07-007-070</hdstNzlName> 
  <nzavSpecName>AA05700</nzavSpecName> 
  <nzavNzlDiameter>0.0</nzavNzlDiameter> 
  <nzavNzlSizeX>0.7</

nzavNzlSizeX

Answer 1

您可以使用XPathNavigator选择节点，看看是否有结果。

例如：

FileStream stream = new FileStream("c:\\file.xml", FileMode.Open);
XPathDocument document = new XPathDocument(stream);
XPathNavigator navigator = document.CreateNavigator();
XPathNodeIterator node = navigator.Select("/HeadReportUnit");
if (node.Count > 0)
{
   // do stuff
}