.net域名xml数据无效

// 示例代码：验证XML格式
using System;
using System.Xml;

class Program
{
    static void Main()
    {
        string xmlString = "<root><child>Text</root>"; // 错误的XML，child标签未闭合

        try
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.LoadXml(xmlString);
            Console.WriteLine("XML is valid.");
        }
        catch (XmlException ex)
        {
            Console.WriteLine("XML is invalid: " + ex.Message);
        }
    }
}

// 示例代码：处理数据类型错误
using System;
using System.Xml;

class Program
{
    static void Main()
    {
        string xmlString = "<root><number>Text</number>"; // 错误的XML，number应为整数

        try
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.LoadXml(xmlString);
            XmlNode numberNode = xmlDoc.SelectSingleNode("//number");
            int number = int.Parse(numberNode.InnerText); // 这里会抛出异常
            Console.WriteLine("Number is: " + number);
        }
        catch (FormatException ex)
        {
            Console.WriteLine("Data type error: " + ex.Message);
        }
    }
}

// 示例代码：处理命名空间问题
using System;
using System.Xml;

class Program
{
    static void Main()
    {
        string xmlString = "<ns:root xmlns:ns='http://example.com'><ns:child>Text</ns:child></ns:root>"; // 正确的命名空间声明

        try
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.LoadXml(xmlString);
            XmlNode childNode = xmlDoc.SelectSingleNode("//ns:child", new XmlNamespaceManager(xmlDoc.NameTable));
            Console.WriteLine("Child node is: " + childNode.InnerText);
        }
        catch (XmlException ex)
        {
            Console.WriteLine("Namespace error: " + ex.Message);
        }
    }
}