使用XPathNodeIterator循环遍历xml的问题 [英] Problem looping through xml using XPathNodeIterator

问题描述

我有以下xml：

< items>

     < item>

          < id> 1< / id>

          < name> Item1< / name>

          < types>

             < type>&
                 < id> 1< / id>

             < / type>

             < type>&
                  < id> 2< / id>

             < / type

          < / types>

      < / item>

     < item>

          < id> 2< / id>

          < name> Item2< / name>

          < types>

             < type>&
                  < id> 2< / id>

             < / type

          < / types>

      < / item>

    < / items>

我有以下代码：

  Dim xPathNavigator
< span style ="font-size：x-small; color：＃0000ff"> As XPathNavigator = xpd.CreateNavigator（）

Dim xPathExpression
< span style ="font-size：x-small; color：＃0000ff"> As XPathExpression = xPathNavigator.Compile（" / items / item"）

昏暗 xni
As XPathNodeIterator = xPathNavigator。[Select]（xPathExpression）
xPathExpression = xPathNavigator.Compile（" / items / item / types / type"）
选择
案例 xPathExpression.ReturnType
案例 XPathResultType。[String]
退出
选择

xni.MoveNext（）

  Response.Write（xPathNavigator。[Select]（xPathExpression））

  案例 XPathResultType.NodeSet
虽然 xni.MoveNext（）
昏暗 i
As XPathNodeIterator = xni.Current.SelectChildren（" id"，""）
当 i.MoveNext（）
如果 i.Current.Value = 1
然后

xni = xPathNavigator。[Select]（xPathExpression）

'处理

  xni.Current.MoveToParent （）

xni.Current.MoveToFirstAttribute（）
结束  虽然

结束
虽然

退出
选择

 

  我希望能够做的只是当type = 1属于类型集合时才返回名称。  I可以迭代整个xml工作表中的所有类型，但不只是一个项目的
。

解决方案

您好，

您可以在XPath中表达：

 Dim doc = New XmlDocument（）
 doc.Load（" myxml.xml"）
 
 For Each node As XmlNode in doc.SelectNodes（" / items / item [types / type / id = 1] / name"）
 Console.WriteLine（node.InnerText）
 Next 

谢谢，

I have the following xml:

<items>
     <item>
          <id>1</id>
          <name>Item1</name>
          <types>
             <type>
                 <id>1</id>
             </type>
             <type>
                  <id>2</id>
             </type
          </types>
      </item>

     <item>
          <id>2</id>
          <name>Item2</name>
          <types>
             <type>
                  <id>2</id>
             </type
          </types>
      </item>
    </items>

I have the following code:

 Dim xPathNavigator As XPathNavigator = xpd.CreateNavigator()
Dim xPathExpression As XPathExpression = xPathNavigator.Compile("/items/item")
Dim xni As XPathNodeIterator = xPathNavigator.[Select](xPathExpression) xPathExpression = xPathNavigator.Compile("/items/item/types/type") Select Case xPathExpression.ReturnType Case XPathResultType.[String] Exit Select

xni.MoveNext()

 Response.Write(xPathNavigator.[Select](xPathExpression))

 Case XPathResultType.NodeSet While xni.MoveNext() Dim i As XPathNodeIterator = xni.Current.SelectChildren("id", "") While i.MoveNext() If i.Current.Value = 1 Then

xni = xPathNavigator.[Select](xPathExpression)

' Do processing

 xni.Current.MoveToParent()
xni.Current.MoveToFirstAttribute() End While
End While
Exit Select

 

 What I'd like to be able to do is only bring back the name only if type = 1 is in the collection of types.  I can iterate through all the types in the whole xml sheet but not just for one item.

解决方案

Hi,

You can express that in XPath:

    Dim doc = New XmlDocument()
    doc.Load("myxml.xml")

    For Each node As XmlNode In doc.SelectNodes("/items/item[types/type/id=1]/name")
      Console.WriteLine(node.InnerText)
    Next

Thanks,

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