c# - 如何使用 C# 检索 XML 中嵌套元素的元素值

Question

<config>
<timeDifferenceFields>
    <TimeDifference>
        <StartTimeField>txt_SoReinigungUhrzeitvonZ1</StartTimeField>
        <EndTimeField>txt_SoReinigungUhrzeitbisZ1</EndTimeField>
        <OutputTimeField>txt_SoReinigungZ1</OutputTimeField>
    </TimeDifference>
    <TimeDifference>
        <StartTimeField>txt_SoReinigungUhrzeitvonZ2</StartTimeField>
        <EndTimeField>txt_SoReinigungUhrzeitbisZ2</EndTimeField>
        <OutputTimeField>txt_SoReinigungZ2</OutputTimeField>
    </TimeDifference>
    <TimeDifference>
        <StartTimeField>txt_SoReinigungUhrzeitvonZ3</StartTimeField>
        <EndTimeField>txt_SoReinigungUhrzeitbisZ3</EndTimeField>
        <OutputTimeField>txt_SoReinigungZ3</OutputTimeField>
    </TimeDifference>
</timeDifferenceFields>
</config>

你好，

谁能帮我完成这个简单的任务，我不明白...

我想遍历上述 XML 文件中的 TimeDifference-Fields。对于每个 TimeDifference 节点，我想使用给定的 XML 值调用一个方法。

有了这个它会遇到一个NPE ...有人可以帮忙吗

     XmlDocument configDoc = new XmlDocument();
        configDoc.Load(configXml);

        XmlNode timeFields = configDoc.SelectSingleNode("/config/timeDifferenceFields/TimeDifference");
        foreach (XmlNode timeNode in timeFields)
        {
        String OutputTimeField = timeNode.SelectSingleNode("OutputTimeField").InnerXml;
        String StartTimeField = timeNode.SelectSingleNode("StartTimeField").InnerXml;
        String EndTimeField = timeNode.SelectSingleNode("EndTimeField").InnerXml;
        addTimeDiffElement(inputDoc, OutputTimeField, StartTimeField, EndTimeField);
        }

Answer 1

SelectSingleNode返回（顾名思义）不超过一个节点。请改用 XmlNodeList timeFields = configDoc.SelectNodes("/config/timeDifferenceFields/TimeDifference")。