使用sum条件XPATH C#的SelectNodes

<root>
  <items>
    <item price="10"/>
    <item price="20"/>
    <item price="30"/>
  </items>
</root>

using System;
using System.Xml;

class Program
{
    static void Main()
    {
        string xml = @"
        <root>
          <items>
            <item price=""10""/>
            <item price=""20""/>
            <item price=""30""/>
          </items>
        </root>";

        XmlDocument doc = new XmlDocument();
        doc.LoadXml(xml);

        // 使用XPath sum函数计算所有item元素的price属性之和
        string xpathExpression = "//item/@price";
        XmlNodeList priceNodes = doc.SelectNodes(xpathExpression);

        int sum = 0;
        foreach (XmlNode node in priceNodes)
        {
            sum += int.Parse(node.Value);
        }

        Console.WriteLine("Total sum of prices: " + sum);
    }
}