Linq to XML - C#生成XML

1.System.Xml.XmlDocument
 XML file转成字符串
 string path3 = @"C:\Users\test.xml";
 XmlDocument xmlDoc = new XmlDocument();
 xmlDoc.Load(path3);
 string xmlStr = xmlDoc.InnerXml

 查找结点，需加上命名空间
xmlDoc.Load(path);
XmlNamespaceManager nsMgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsMgr.AddNamespace("soap", "http://www.w3.org/2003/05/soap-envelope");
string startNode = "/soap:Envelope/soap:Body/Test";
XmlNodeList nodeList = xmlDoc.SelectNodes(startNode, nsMgr);

真心麻烦。。。

2. System.Xml.Serialization
从object到XML字符串一气生成，非常好用，果断点赞!
using System.Xml;

using System.Xml.Linq;

using System.Xml.XPath;

using System.Xml.Serialization;

        public static string ObjToXmlStr(Object obj)
        {
            string xmlStr = string.Empty;
            //XmlSerializer xmlser = new XmlSerializer(obj.GetType());
            //using (StringWriter sw = new StringWriter())
            //{
            //    xmlser.Serialize(sw, obj);
            //    xmlStr = sw.ToString();
            //};
              
           using(MemoryStream ms = new MemoryStream()){
               StreamWriter sw = new StreamWriter(ms);
               XmlWriterSettings setting = new XmlWriterSettings();
               setting.Encoding = Encoding.UTF8 ;
               setting.Indent = true ;
               XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
               ns.Add("xsi", "http://www.w3.org/2001/XMLSchema-instance");
               using (XmlWriter writer = XmlWriter.Create(sw, setting))
               {
                   XmlSerializer xmlser = new XmlSerializer(obj.GetType());
                   xmlser.Serialize(writer, obj ,ns);
                   writer.Flush();
                   writer.Close();
               }
               using (StreamReader sr = new StreamReader(ms))
               {
                   ms.Position = 0;
                   xmlStr = sr.ReadToEnd();
                   sr.Close();
               }
           }
           return xmlStr; 
                
        }

        public static Object XmlStrToObj(string xmlStr)
        {
            Object obj = new Object();
            using (StringReader sr = new StringReader(xmlStr))
            {
                XmlSerializer xmldes = new XmlSerializer(typeof(SendPayslipRequest));
                obj = xmldes.Deserialize(sr);
            }
            return obj;
        }

        public static XElement GetXEleByName(IEnumerable<XElement> xEles , string eleName)
        {
            var q = from item in xEles
                    where item.Name.LocalName == eleName
                    select item;
            return q.FirstOrDefault();
        }

        public static void SetXEleValueByName(IEnumerable<XElement> xEles , string eleName , string eleValue)
        {
            XElement xele = GetXEleByName(xEles, eleName);
            if(xele != null) xele.Value = eleValue;
        }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Serialization;
using System.Runtime.Serialization;

namespace VML.Employee.DataContracts
{

    [XmlRoot("sendPayslipRequest", Namespace = "http://www.abc.com/Test.xsd")]
    public class Test
    {
        [XmlAttributeAttribute("schemaLocation", Namespace = "http://www.w3.org/2001/XMLSchema-instance")]
        public string xsi = "http://www.abc.com/Test.xsd";

        [DataMember]
        [XmlElement("TestID")]
        public String TestID { get; set; }
        [DataMember]
        [XmlElement("TestName")]
        public String TestName { get; set; }
    }
}

根据test生成string

Test test = new Test();
            test.TestID = "ID1";
            test.TestName = "TestName";
            string testXmlStr = XmlHelper.ObjToXmlStr(test);

生成的xml string:

<?xml version="1.0" encoding="utf-8"?>
<sendPayslipRequest xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.abc.com/Test.xsd" xmlns="http://www.abc.com/Test.xsd">
  <TestID>ID1</TestID>
  <TestName>TestName</TestName>
</sendPayslipRequest>

定位到某个element:

XDocument xDoc2 = XDocument.Parse(testXmlStr);

IEnumerable<XElement> xEles2 = xDoc2.Root.Elements();

XElement xele = XmlHelper.GetXEleByName(xEles2, "TestID");