C# 各种操作xml 简单介绍
直接上代码大家一看就明白了...
// xml容器有xmldocuent ,xdocument .xpathdocument///
/////// xml 加载文件方式分为三种 一,直接xmldoc.load(path) 二.xmldoc.loadxml(string text),三.xmldoc.load(stream strem)///////
//用linq 加载操作xml///
var doc1 = XDocument.Load(Server.MapPath("Test.xml"));
string path = Server.MapPath("Test.xml");
Readstreamxml(path);
ReadXml(path);
string str = @"<Customers><Customer id='01' city='Beijing' country='China' name='Lenovo'/></Customers>";
// linq 加载方式 //
var doc2 = XDocument.Parse(str);
///xmldco 加载方式//
XmlDocument xmldoc = new XmlDocument();
xmldoc.LoadXml(str);
//xpathdocument 是只读容器///
XPathDocument document = new XPathDocument(path);
XPathNavigator navigator = document.CreateNavigator();
XPathNodeIterator nodes = navigator.Select("/Customers/Customer");
while (nodes.MoveNext())
{
Console.WriteLine(nodes.Current.Name);
}
//xmldocument xpath 查询//
XmlNodeList nodelist = xmldoc.SelectNodes("/Customers/Customer");
//linq xpath 查询//
var result = from customer in doc1.Descendants("Customer")
select customer.Value;
foreach (var s in result)
{
Console.WriteLine(s);
}
var results = (from order in doc1.Descendants("Order")
where order.Attribute("OrderID").Value == "1003"
select new
{
CustomerID = order.Parent.Attribute("id").Value,
Freight = (decimal)order.Attribute("Freight")
}).FirstOrDefault();
Console.WriteLine(string.Format("Customer ID: {0} Freight: {1}", results.CustomerID, results.Freight));
/// <summary>
/// 以文件 流的方式读取
/// </summary>
/// <param name="path"></param>
private void Readstreamxml(string path)
{
using (FileStream file = new FileStream(path, FileMode.Open, FileAccess.ReadWrite))
{
XmlDocument xmldoc = new XmlDocument();
xmldoc.Load(file);
XmlNode root = xmldoc.SelectSingleNode("Customers");
XmlElement xe1 = xmldoc.CreateElement("c");
root.AppendChild(xe1);
file.SetLength(0);//将文件指针移到起始位置
xmldoc.Save(file);
}
}
//以xmlreader 方式读出xml//
public void ReaderXml(string path)
{
XmlReaderSettings xmlsetting = new XmlReaderSettings();
xmlsetting.ProhibitDtd = false;
StringBuilder str = new StringBuilder();
XmlReader xmlreader = XmlReader.Create(path, xmlsetting);
while (xmlreader.Read())
{
switch (xmlreader.NodeType)
{
case XmlNodeType.Element:
if (xmlreader.IsEmptyElement)
{
str.Append(string.Format("name:{0}", xmlreader.Name));
}
else
{
str.Append(xmlreader.Name);
if (xmlreader.HasAttributes)
{
while (xmlreader.MoveToNextAttribute())
{
str.AppendFormat("{0}={1}", xmlreader.Name, xmlreader.Value);
}
}
}
break;
//后面还有一结点类型//
}
}
}
/// <summary>
/// 以textreader方式读取
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
private string ReadXml(string path)
{
//string xmlFile = Server.MapPath(path);
XmlTextReader reader = new XmlTextReader(path);
StringBuilder str = new StringBuilder();
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
str.Append("Element: <b>").Append(reader.Name).Append("</b><br />");
break;
case XmlNodeType.Text:
str.Append(" - Value: <b>").Append(reader.Value).Append("</b><br />");
break;
case XmlNodeType.XmlDeclaration:
str.Append("Xml Declaration: <b>");
str.Append(reader.Name).Append(" ").Append(reader.Value).Append("</b><br />");
break;
}
if (reader.AttributeCount > 0)
{
while (reader.MoveToNextAttribute())
{
str.Append(" - Attribute: <b>").Append(reader.Name);
str.Append("</b> Value: <b>").Append(reader.Value).Append("</b><br />");
}
}
}
reader.Close();
return str.ToString();
}
