SelectSingleNode 不返回任何内容 [英] SelectSingleNode returns nothing

问题描述

我正在测试 SelectSingleNode 函数以从 Visual Studio 中的 XMLNode 对象获取单个节点，如下所示:

I'm testing the SelectSingleNode function to fetch a single node from an XMLNode object in Visual Studio as follows:

        Dim nsmgr As XmlNamespaceManager = New XmlNamespaceManager(xmlDoc.NameTable)
        nsmgr.AddNamespace(ndListItems.Prefix, ndListItems.NamespaceURI)
        Dim dummy As XmlNode = ndListItems.SelectSingleNode("/listitems", nsmgr)

此时，我只是想获取根节点，我正在使用 prefix 和 namespaceURI 属性添加到 XmlNamespaceManager .问题是，当我运行调试器时，虚拟变量没有被分配，即什么都没有.请注意，当我分析 Prefix 和 namespace 属性的值时，它们如下所示，Prefix="" 和 NamespaceURI="http://schemas.microsoft.com/sharepoint/soap"

At this point, I'm just trying to get the root node and I'm using the prefix and namespaceURI property to add to the XmlNamespaceManager . Problem is that when I run the debugger the dummy variable is not being assigned, i.e it is Nothing. Just to note, when I analyze the values of the Prefix and namespace property they are as follows, Prefix="" and NamespaceURI="http://schemas.microsoft.com/sharepoint/soap"

更新:

尝试更改代码，但我的虚拟 XMLNode 仍未设置

Tried changing the code, but my dummy XMLNode is still not getting set

Dim nsmgr As XmlNamespaceManager = New XmlNamespaceManager(xmlDoc.NameTable)
        nsmgr.AddNamespace(ndListItems.Prefix, ndListItems.NamespaceURI)
        Dim dummy As XmlNode = ndListItems.SelectSingleNode("/" + ndListItems.Prefix + "listitems", nsmgr)

这是我想要获取的 XML 代码片段，我的最终目标是访问 z:row 节点的属性

Here is the XML code snippet of what I'm trying to get, my ultimate goal is to access the attributes of the z:row node

<listitems xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns="http://schemas.microsoft.com/sharepoint/soap/">
<rs:data ItemCount="1">
   <z:row ows_Title="Newhire" ows_FirstName="Rick" ows_WorkPhone="954" ows_HomePhone="954" ows_Email="[e-mail]" ows_UserID="Rick.Newhire" ows_MetaInfo="9;#" ows__ModerationStatus="0" ows__Level="1" ows_ID="9" ows_owshiddenversion="1" ows_UniqueId="9;#{0F6251A9-D3B8-4B07-A5F8-23BAF5F2237E}" ows_FSObjType="9;#0" ows_Created="2010-08-18 15:56:40" ows_FileRef="9;#Lists/NewHires/9_.000" />
</rs:data>
</listitems>

推荐答案

在您的输入示例中，z:row 元素的 QName 元组是 ("#RowsetSchema","row","z").这意味着 z 前缀的命名空间 URI 是 #RowsetSchema.

In your input sample the QName tuple for z:row element is ("#RowsetSchema","row","z"). Meaning that the namespace URI for z prefix is #RowsetSchema.

如果我没有弄错你的 C# 代码，这个 ndListItems.Prefix 评估为 listitems 元素的前缀，它是 none 或 "".因此，当您说 "/" + ndListItems.Prefix + "listitems" 时，它会被评估为/listitems"，它将被解释为没有命名空间的 listitems.

If I'm not getting wrong your C# code, this ndListItems.Prefix evaluate to listitems element's prefix wich is none or "". So, when you say "/" + ndListItems.Prefix + "listitems", it gets evaluated to "/listitems" wich it will be interpreted as a listitems under no namespace.

所以，我认为您需要:

Dim nsmgr As XmlNamespaceManager = New XmlNamespaceManager(xmlDoc.NameTable) 
nsmgr.AddNamespace("soap", "http://schemas.microsoft.com/sharepoint/soap/")
nsmgr.AddNamespace("rs", "urn:schemas-microsoft-com:rowset")
nsmgr.AddNamespace("z", "#RowsetSchema")
Dim dummy As XmlNode = ndListItems.SelectSingleNode("/soap:listitems/rs:data/z:row", nsmgr)

编辑:我发帖后想到了.

这篇关于SelectSingleNode 不返回任何内容的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！