更改 xml 节点值

本文关键字:节点 xml 更改 | 更新日期: 2023-09-27 18:32:40

我有一个如下所述的xml:

<Attributes>
  <Attribute>
    <EntryID>0</EntryID>
    <ContractID>227860</ContractID>
    <FieldID>10882</FieldID>
    <GroupID>0</GroupID>
    <InstanceID>0</InstanceID>
    <Value>C:'Users'laitkor'Downloads'BulkTest826.mp4</Value>
    <CreatedBy>615</CreatedBy>
    <CreatedOn>12/1/2014 6:51:04 AM</CreatedOn>
    <UpdatedBy>615</UpdatedBy>
    <UpdatedOn>12/1/2014 6:51:04 AM</UpdatedOn>
  </Attribute>
</Attributes>

我必须将节点值"值"从C:'Users'laitkor'Downloads'BulkTest826.mp4更改为BulkTest826.mp4

我尝试使用以下方法更改值:

  XmlDocument xml = new XmlDocument();
        xml.LoadXml(nodes); 
        bool isMultimedia = false;
        XmlNodeList xnList = xml.SelectNodes("/Attributes/Attribute");
        foreach (XmlNode xn in xnList)
            {
            int FieldId = Convert.ToInt32(xn["FieldID"].InnerText);
            isMultimedia = true;
            if (isMultimedia) {
            string MultiMediaFilePath = xn["Value"].InnerText;
            createMultimediaFile(FieldId, MultiMediaFilePath, contractID);//todo
            string fileName = MultiMediaFilePath.Substring(MultiMediaFilePath.LastIndexOf('''', MultiMediaFilePath.Length - 1));
            fileName = fileName.TrimStart('''');
            xn.SelectSingleNode("/Attributes/Attribute/Value").InnerText = fileName;
                }
            retval = SiteProvider.ContractBulk.AddBulkContractField(nodes, contractID, groupID, sequenId, 1);//issue here
            return retval;
            }

但是我以XML格式获得的节点值没有更新的"值"节点的值,并带有注释"此处的问题"

更改 xml 节点值

        XmlDocument xml = new XmlDocument();
        xml.LoadXml(nodes);
        bool isMultimedia = false;
        XmlNodeList xnList = xml.SelectNodes("/Attributes/Attribute");
        foreach(XmlNode node in xnList)
        {
            XmlNode n1 = node.SelectSingleNode("Value");
            //I will suppose that you need to do that for more than one Value node
            if(n1.InnerText.Contains(@"C:'Users'laitkor'Downloads'"))
            {
                n1.InnerText = n1.InnerText.Replace(@"C:'Users'laitkor'Downloads'", "");
            }
        }

我假设您想为不同的文件不止一次这样做。我曾经替换过C:'Users'laitkor'Downloads',如果位置可以不同,您可以找到最后'的索引,并substring直到此索引。

使用 System.Linq.Xml 命名空间中的 XElement。更直观的 XML 解析。

var xml=
XElement.Parse(yourXml); // or load XElement.Load(file);
var node = xml.Descendants()
    .FirstOrDefault(x => x.Name == "Value" && x.Parent.Name =="Attribute"); 
node.Value="BulkTest826.mp4"; // If you only need one
// Or
var valueNodes = xml.Descendants("Value");
foreach(var val in valueNodes)
{
  // val.Value = "You new value";
}

你可以这样做:

        XmlNodeList nodes = doc.SelectNodes("Attributes/Attribute");
        foreach (XmlNode node in nodes)
        {
            node.SelectSingleNode("Value").InnerText = fileName;
        }

问题是您正在尝试从

节点/属性/属性节点/属性/属性/值获取

试试这个

using System;
using System.Linq;
using System.Xml.Linq;
using System.Xml.XPath;                 
using System.IO;
public class Program
{
    public static void Main()
    {
        //XElement xml = XElement.Load(xmlFile); //Load from file
        XElement xml=XElement.Parse(@"<Attributes>  <Attribute>    <EntryID>0</EntryID>    <ContractID>227860</ContractID>    <FieldID>10882</FieldID>    <GroupID>0</GroupID>    <InstanceID>0</InstanceID>    <Value>C:'Users'laitkor'Downloads'BulkTest826.mp4</Value>    <CreatedBy>615</CreatedBy>    <CreatedOn>12/1/2014 6:51:04 AM</CreatedOn>    <UpdatedBy>615</UpdatedBy>    <UpdatedOn>12/1/2014 6:51:04 AM</UpdatedOn>  </Attribute></Attributes>");
        var valueElements = xml.XPathSelectElements("//Attribute/Value");
        foreach(XElement valueElement in valueElements)
        {           
            valueElement.Value=Path.GetFileName(valueElement.Value);
            Console.WriteLine(valueElement.Value);
        }
    }
}