c# - 使用 C# 在 XML 节点内添加子节点

Question

这是我给定的 XML:-

<?xml version="1.0" encoding="utf-8"?>
<Processes>
  <Process Name="Process1" Namespace="" Methodname="">
    <Validations/>
    <Transformations/>
    <Routings/>
  </Process>
</Processes>

我想在验证内添加新节点验证，为此我编写了以下代码:-

XmlDocument originalXml = new XmlDocument();
originalXml.Load(@"C:\Users\Sid\Desktop\Process\Process1.xml");    
XmlNode Validations = originalXml.SelectSingleNode("/Processes/Process[Name="Process1"]/Validations");
XmlNode Validation = originalXml.CreateNode(XmlNodeType.Element, "Validation",null);
Validation.InnerText = "This is my new Node";
Validations.AppendChild(Validation);
originalXml.Save(@"C:\Users\Sid\Desktop\Process\Process1.xml");

但是，我在“Validations.AppendChild(validation)”行中收到错误，因为对象引用未设置为对象的实例。请提出一些解决方法。

Answer 1

你可以这样做

XDocument doc = XDocument.Load(@"C:\Users\Sid\Desktop\Process\Process1.xml");
var a = doc.Descendants("Validations").FirstOrDefault();
a.Add(new XElement("Validation", "This is my new Node"));
doc.Save(@"C:\Users\Sid\Desktop\Process\Process1.xml");