ByteArrayOutputStream s = new OutputStreamWriter(out, "utf-8");TransformerFactory tf = TransformerFactory.newInstance();Transformer transformer = tf.newTransformer();transformer.setOutputProperty(OutputKeys.INDENT, "yes");transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount","4");transformer.transform(new DOMSource(doc), new StreamResult(s));

<?xml version="1.0" encoding="UTF-8"?><a>       <b>bbbbb</b> </a>

transformer.setOutputProperty(OutputKeys.STANDALONE, "yes");

 transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, "yes");

c# – 从XmlElement创建XPathDocument

我正在使用一个Web服务,它将一个XmlElement对象返回给我的C#程序.我想使用Xpath从XmlElement中读取信息.从XmlElement创建XPathDocument的最佳方法是什么？

解决方法:

你可以对XmlElement使用create a navigator directly并使用你的xpath导航器选择*方法,不需要XPathDocument.

C# 操作XML文件 XmlDocument和XElement

首先在根目录下新建一个config.xml：

<?xml version="1.0" encoding="utf-8"?>
<Config>
    <Debug>
        <Lan>
            <Server Ip="142.12.10.123" Port="9601"/>
        </Lan>
        <Logger enable="false" />
    </Debug>
</Config>

XmlDocument位于System.Xml 下，是专门处理xml节点的

XElement位于System.Xml.Linq下，是可以对xml进行linq的查询操作的

分别使用XmlDocument和XElement获取节点的值：

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

namespace FileXml
{
    class Program
    {
        static void Main(String[] args)
        {
            //获取xml路径
            var current_dir = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
            var xml_path = Path.Combine(current_dir, @"config.xml");

            //使用XElement快速获取节点值
            XElement xmlElement = XElement.Load(xml_path);
            String IP = xmlElement.Element("Debug").Element("Lan").Element("Server").Attribute("Ip").Value.ToString();
            Console.WriteLine(IP);
            bool isLogger = xmlElement.Element("Debug").Element("Logger").Attribute("enable").Value == "true";
            Console.WriteLine(isLogger);



            //使用XElement快速获取节点值
            XmlDocument xml_doc = new XmlDocument();
            xml_doc.Load(xml_path);
            var IP2 = xml_doc.SelectSingleNode("/Config/Debug/Lan/Server").Attributes["Ip"].Value;
            var IP2_name = xml_doc.SelectSingleNode("/Config/Debug/Lan/Server").Attributes["Ip"].Name;
            Console.WriteLine(IP2_name+":"+ IP2);
            bool isLogger2 = xml_doc.SelectSingleNode("/Config/Debug/Logger").Attributes["enable"].Value == "true";
            Console.WriteLine(isLogger2);
            Console.ReadLine();
        }
    }
}

总结：如果是简单查询 总体上来说两者差不多

感觉还是XmlDocument.SelectSingleNode(XPath)更方便一些

普通用XmlDocument就够了

Xml单例管理类：

using System;
using System.IO;
using System.Reflection;
using System.Xml;

namespace FileXml
{
    class Program
    {
        static void Main()
        {
            var ip = XmlManager.instance.XmlDoc.SelectSingleNode("/Config/Debug/Lan/Server").Attributes["Ip"].Value;
            var ip_name = XmlManager.instance.XmlDoc.SelectSingleNode("/Config/Debug/Lan/Server").Attributes["Ip"].Name;
            Console.WriteLine($"{ip_name} : {ip}");
            bool isLogger = XmlManager.instance.XmlDoc.SelectSingleNode("/Config/Debug/Logger").Attributes["enable"].Value == "true";
            Console.WriteLine(isLogger);
            Console.ReadLine();
        }
    }

    public class XmlManager
    {
        private static XmlManager _instance = null;
        public static XmlManager instance
        {
            get
            {
                if (_instance == null)
                {
                    return new XmlManager();
                }
                return _instance;
            }
        }

        private XmlDocument _xml_doc = null;
        public XmlDocument XmlDoc
        {
            get
            {
                if (_xml_doc == null)
                {
                    var current_dir = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
                    var xml_path = Path.Combine(current_dir, @"config.xml");
                    _xml_doc = new XmlDocument();
                    _xml_doc.Load(xml_path);
                }
                return _xml_doc;
            }
        }
    }
}

delphi – 通过TXMLDocument访问IXMLDOMDocument2？

function CreateDOMDocument: IXMLDOMDocument;
var doc :IXMLDOMDocument2;
begin

  doc := TryObjectCreate([CLASS_DOMDocument60,CLASS_DOMDocument40,CLASS_DOMDocument30,CLASS_DOMDocument26,msxml.CLASS_DOMDocument]) as IXMLDOMDocument2;
  if not Assigned(doc) then
    raise DOMException.Create(SMSDOMnotinstalled);
  doc.setProperty('AllowXsltScript',true);  // Allow XSLT scripts!!
  Result := doc;
end;

unit Unit27;

interface

uses
  xmldoc,xmlintf,msxml,msxmldom,Forms,SysUtils,ActiveX,ComObj,XmlDom,XmlConst,Windows,Messages,Classes,Controls,StdCtrls;

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function TryObjectCreate(const GuidList: array of TGuid): IUnkNown;
var
  I: Integer;
  Status: HResult;
begin
  Status := S_OK;
  for I := Low(GuidList) to High(GuidList) do
  begin
    Status := CoCreateInstance(GuidList[I],nil,CLSCTX_INPROC_SERVER or
      CLSCTX_LOCAL_SERVER,Idispatch,Result);
    if Status = S_OK then Exit;
  end;
  OleCheck(Status);
end;

function CreateDOMDocument2: IXMLDOMDocument;

var
  Doc2 : IXMLDOMDocument2;

begin
  Doc2 := TryObjectCreate([CLASS_DOMDocument60,msxml.CLASS_DOMDocument]) as IXMLDOMDocument2;
  if not Assigned(Doc2) then
    raise DOMException.Create(SMSDOMnotinstalled);
  Doc2.setProperty('AllowXsltScript',true);
  Result := Doc2;
end;


procedure TForm1.FormCreate(Sender: TObject);

var
 Doc : IXMLDocument;

begin
 Doc := TXMLDocument.Create(nil);
 Doc.LoadFromFile('c:\temp\test.xml');
end;


initialization
 MSXMLDOMDocumentCreate := CreateDOMDocument2;
end.

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