子节点存在问题 [英] An issue with Child Nodes

问题描述

我需要检查给定节点是否有子节点，使用

I need to check if a given node has child nodes or not , this may seem simple to implement using

node.childnode.count或node.haschildnodes，但是如果父节点没有子节点但是具有值，例如

node.childnode.count or node.haschildnodes , however if the parent node does not have child nodes but has a value for example

1< city> New York< / city>

1 <city>New York</city>

 

2< city>

2 <city>

< zone> Manhattan< / zone>

<zone>Manhattan</zone>

< zone> Staten Island< / zone>

<zone>Staten Island</zone>

< / city>

</city>

此处有1 I需要将节点设置为xpath ... / city为node.childnode.count或node.haschildnodes返回false，但只要此节点的值为'New York'为1，它就会继续返回true。这种例外行为是否有不同的方式让
这个起作用？这使得很难区分1& 2。

here with 1 I need the node set to xpath .../city to return false for node.childnode.count or node.haschildnodes but as long as this node has a value 'New York' for 1 it continues to return true. is this excepted behavior is there a different way to get this to work? this makes it difficult to distinguish between 1 & 2.

只是为了完成查询，这是我用来加载xml的代码。

Just to complete the query this is code I use to load the xml.

xmldoc = New XmlDocument

            xmldoc.Load（xmlfilePath）

            xmln = xmldoc.SelectSingleNode（xPath）

xmldoc = New XmlDocument
            xmldoc.Load(xmlfilePath)
            xmln = xmldoc.SelectSingleNode(xPath)

使用SelectSingleNode或selectnode似乎无关紧要，我通过检查xmln.FirstChild.Name<>来解决这个问题。 "＃text"，在寻找处理任何子依赖关系之前，我觉得这有点天真，如果有更好的方法可以知道
。

does not seem to matter whether you use SelectSingleNode or selectnode , i have worked around this by checking for xmln.FirstChild.Name <> "#text", before looking to process for any child dependency, i find this a bit naif and need to know if there is a better way to get this done.

 

 

 

 

 

推荐答案

XmlDocument 是微软.NET框架中的DOM实现，在该模型中如果你有例如

XmlDocument  is the DOM implementation in Microsoft's .NET framework, in that model if you have e.g.

< foo> bar< / foo>

<foo>bar</foo>

那么" FOO" XmlElement对象确实有一个子节点，一个值为"bar"的XmlText节点。因此，HasChildNodes确实是真的，只有你有例如

then the "foo" XmlElement object has indeed one child node, an XmlText node with Value "bar". Thus HasChildNodes is indeed true, it is only false if you have e.g

< foo />

<foo/>

或

< foo>< / foo>

<foo></foo>

如果要检查元素节点是否没有元素子节点，那么可以使用例如

If you want to check whether an element node has no element child nodes then you could use e.g.

if（node.SelectSingleNode（" *"）== null）

if (node.SelectSingleNode("*") == null)

with C＃或

if node.SelectSingleNode（ < *"）Nothing Then

If node.SelectSingleNode("*") Is Nothing Then

与VB.net。

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