C# 读取XML文件中的下一个值

我有这样一个XML文件：

    <key>businessAddress</key>
    <string>Moka</string>
    <key>businessName</key>
    <string>Moka address</string>
    <key>Id</key>
    <string>39</string>
    <key>Cat</key>
    <string>216</string>
    <key>deals</key>

但我没有成功

---

感谢您的帮助

您可以使用布尔标志指示是否应读取下一个元素的值：

bool shouldReadId = false;
while (reader.Read())
{
    if (reader.NodeType == XmlNodeType.Text && shouldReadId)
    {
        Console.WriteLine(reader.Value); // will print 39
        shouldReadId = false;
    }

    if (reader.Value.Equals("Id"))
    {
        // indicate that we should read the value of the next element
        // in the next iteration
        shouldReadId = true;
    }
}

我想指出：

从.NET Framework 2.0开始，我们建议您使用 改为System.Xml.XmlReader类

尽管他们的对象模型没有任何显著的区别

因此，如果您想使用XmlTextReader，可以执行以下操作：

public static class XmlReaderExtensions
{
    public static void EnsureRead(this XmlTextReader reader)
    {
        var isRead = reader.Read();
        if (!isRead)
            throw new InvalidOperationException("Failed to read");
    }

    public static void SkipUntil(this XmlTextReader reader, Func<XmlTextReader, Boolean> isStop)
    {
        while (!isStop(reader))
        {
            reader.EnsureRead();
        }
    }
}

---

您的XML看起来很像。听起来你需要一个Plist库。与其重新发明轮子，不如使用它。他们将解决您解析XML文件的问题

如果您坚持手动解析XML，那么就不要考虑低级SAX类，而只使用DOM。使用

XDocument

要容易得多。参见@EugenePodskal的解决方案

public static class XmlReaderExtensions
{
    public static void EnsureRead(this XmlTextReader reader)
    {
        var isRead = reader.Read();
        if (!isRead)
            throw new InvalidOperationException("Failed to read");
    }

    public static void SkipUntil(this XmlTextReader reader, Func<XmlTextReader, Boolean> isStop)
    {
        while (!isStop(reader))
        {
            reader.EnsureRead();
        }
    }
}

var xml = @"<root>   <key>businessAddress</key>
    <string>Moka</string>
    <key>businessName</key>
    <string>Moka address</string>
    <key>Id</key>
    <string>39</string>
    <key>Cat</key>
    <string>216</string>
    <key>deals</key> </root>";

using (var stream = new MemoryStream(Encoding.Default.GetBytes(xml)))
using (var reader = new XmlTextReader(stream))
{
    reader.SkipUntil(cur => cur.Value == "Id");
    reader.EnsureRead(); // Skip current node
    reader.SkipUntil(cur => cur.NodeType == XmlNodeType.Text);
    Console.WriteLine("The id from XmlTextReader is {0}", reader.Value);
}

using (var stream = new MemoryStream(Encoding.Default.GetBytes(xml)))
{
    var xdoc = XDocument.Load(stream);
    var id = xdoc
        .Root
        .Elements("key")
        .First(element =>
            element.Value == "Id")
        .ElementsAfterSelf("string")
        .First()
        .Value;
    Console.WriteLine("The id from XDocument is {0}", id);
}