更新与 Xpath 查询匹配的多个 XML 节点 C#答案

【问题标题】：Update multiple XML nodes that match an Xpath query C#更新与 Xpath 查询匹配的多个 XML 节点 C#
【发布时间】：2020-09-24 20:40:43
【问题描述】：

我正在尝试更新与特定 xpath 匹配的多个节点的内容。例如，在下面的示例中，我想用“Hello”更新当前为“2”的任何 attribute1 节点。最好的方法是什么？

(DotNetFiddle Here)

using System;
using System.IO;
using System.Xml;
using System.Linq;

public class Program
{
    public static void Main()
    {
        XmlDocument job = new XmlDocument();
        job.LoadXml(@"<parent>" +
                        "<report>" +
                            "<main>" +
                                "<attribute1>2</attribute1>"+
                                "<attribute1>2</attribute1>"+
                                "<attribute1>3</attribute1>"+
                            "</main>"+
                        "</report>" +
                    "</parent>");

        string newAttribute1Value = "Hello";

        //How do I update both attribute1's where value=2? 

    }

【问题讨论】：

标签： c# xml xpath

【解决方案1】：

这可能会对您有所帮助：

using System;
using System.IO;
using System.Xml;
using System.Linq;

public class Program
{
    public static void Main()
    {
        XmlDocument job = new XmlDocument();
        job.LoadXml(@"<parent>" +
                        "<report>" +
                            "<main>" +
                                "<attribute1>2</attribute1>"+
                                "<attribute1>2</attribute1>"+
                                "<attribute1>3</attribute1>"+
                            "</main>"+
                        "</report>" +
                    "</parent>");

        string newAttribute1Value = "Hello";

        //How do I update both attribute1's where value=2? 

        // getting the list of nodes with XPath query :
        XmlNodeList nodes = job.SelectNodes("//attribute1[text()=2]");
        foreach (XmlNode child in nodes)
        {
            // replacing the old value with the new value
            child.InnerText = newAttribute1Value ;
        }
    }

【讨论】：