获取对XMLNode的访问权限

Question

我想读一些XML文件的值。我能够读取一些值，但我想获取<tools></tools> - 标签之间的信息。

XmlNodeList xnList = xml.SelectNodes("/instructions/Steps");
foreach (XmlNode xn in xnList)
{

    XmlNodeList xnChildList = xn.ChildNodes;
    foreach (XmlNode xnc in xnChildList)
    {
        MessageBox.Show("ID: " + xnc["ID"].InnerText + "Desc: " + xnc["desc"].InnerText);
        //this one is working so far!


        //I tried to create a new XMLNodeList

        XmlNodeList testNodeList = xnc.SelectNodes("/tools");
        foreach (XmlNode node in testNodeList)
        {
            MessageBox.Show(node["tool"].InnerXml);
        }
    }
}

但它没有用。我该如何处理工具部分？

XML文件如下所示：

<instructions>
    <Steps QualificationID="12,3">
                <Step>
                    <ID>1.1</ID>
                    <desc>desc</desc>
                    <tools>
                        <tool ID = "1" name = "10Zoll Steckschl" />
                        <tool ID = "2" name = "5Zoll Steckschl" />
                    </tools>
                </Step>
                <Step>
                    <ID>1.2</ID>
                    <desc>desc2</desc>
                    <tools>
                        <tool ID = "3" name = "11Zoll Steckschl" />
                        <tool ID = "4" name = "54Zoll Steckschl" />
                    </tools>
                </Step>
    </Steps>
    <Steps QualificationID="1223,3">
                <Step>
                    <ID>2.1</ID>
                    <desc>desc3</desc>
                    <tools>
                        <tool ID = "5" name = "14Zoll Steckschl" />
                        <tool ID = "6" name = "2Zoll Steckschl" />
                    </tools>
                </Step>
                <Step>
                    <ID>2.2</ID>
                    <desc>desc4</desc>
                    <tools>
                        <tool ID = "7" name = "13Zoll Steckschl" />
                        <tool ID = "8" name = "4Zoll Steckschl" />
                    </tools>
                </Step>
    </Steps>
</instructions>

Answer 1

我强烈怀疑这就是问题所在：

XmlNodeList testNodeList = xnc.SelectNodes("/tools");

前导斜杠将其恢复到根节点 - 您只想在 tools下查找xnc元素：

XmlNodeList testNodeList = xnc.SelectNodes("tools");

这就是为什么我个人更喜欢使用LINQ to XML：）

XDocument doc = ...;
foreach (var step in doc.Root.Elements("Steps").Elements("Step"))
{
     MessageBox.Show(string.Format("ID: {0} Desc: {1}",
                     step.Element("ID").Value, step.Element("desc").Value);

     foreach (var tool in step.Elements("tools"))
     {
         ...
     }
}