VBA 从第一个节点开始 - 如果它存在 - 使用 If Is Nothing

VBA Start at first node if it exists - using If Is Nothing

如何从第一个到最后一个递增每个父节点并应用:

For Each n In XMLFile.SelectNodes("/catalog/book")
    If XMLFile.SelectSingleNode("/catalog/book/banana") Is Nothing Then
        MsgBox ("banana not here")
    Else
        MsgBox ("banana found")
    End If
Next

香蕉在第一本书中不存在:

?xml version="1.0"?>
<catalog>
<book id="Adventure">
   <author>Ralls, Kim</author>
   <title>XML Developer's Guide</title>
   <price>44.95</price>
</book>
<book id="Adventure">
   <author>Ralls, Kim</author>
   <title>Midnight Rain</title>
   <price>5.95</price>
   <banana>ring</banana>
</book>
<book id="Adventure">
   <author>Ralls, Kim</author>
   <title>Mist</title>
   <price>15.95</price>
   <banana>ring</banana>
</book>
<book id="Mystery">
   <author>Ralls, Kim</author>
   <title>Some Mystery Book</title>
   <price>9.95</price>
   <banana>ring</banana>
</book>
</catalog>

当前输出: "banana found" "banana found" "banana found" "banana found"

您只是从此处的顶级节点再次重复搜索...

If XMLFile.SelectSingleNode("/catalog/book/banana") Is Nothing Then

...所以你总能得到第一个香蕉节点。您需要在 'n' 上进行操作,而不是 'XMLFile':

If n.SelectSingleNode("banana") Is Nothing Then

请记住,您正在遍历层次结构。