XML with C#

这是一篇不错的C#关于XmlDocument对象 关于操作XML文件的文件。本人从中受益非常！

今与大家共享之。。。

读写XML文件

<?xml version="1.0" encoding="utf-8"?>

<Employeers>

<Employeer ID="DBT39435M">

<HireDate>1/1/1990 12:00:00 上午</HireDate>

<JobLvl>75</JobLvl>

<JobID>11</JobID>

<LastName>Tonini</LastName>

<FirstName>Daniel</FirstName>

</Employeer>

</Employeers>

以上是xml文件模板。

/**//// <summary>

/// 写入xml文件

/// </summary>

/// <param name="fileName">完整文件名</param>

private void WriteXml(string fileName)

{

DataTable dt = DataAccess.AjaxData.GetXmlData();

XmlDocument xmldoc = new XmlDocument();

//创建文件头信息

XmlDeclaration xmldec = xmldoc.CreateXmlDeclaration("1.0", "utf-8", null);

//创建文件根节点

XmlElement rootNode = xmldoc.CreateElement("Employeers");

xmldoc.InsertBefore(xmldec, xmldoc.DocumentElement);

xmldoc.AppendChild(rootNode);

//遍历数据表，

foreach (DataRow dr in dt.Rows)

{

//创建一条记录的父节点

XmlElement parentNode = xmldoc.CreateElement("Employeer");

parentNode.SetAttribute("ID", dr["emp_id"].ToString());

xmldoc.DocumentElement.PrependChild(parentNode);

//为每个字段创建一个子节点

XmlElement FName = xmldoc.CreateElement("FirstName");

XmlElement LName = xmldoc.CreateElement("LastName");

XmlElement JobID = xmldoc.CreateElement("JobID");

XmlElement JobLvl = xmldoc.CreateElement("JobLvl");

XmlElement HireDate = xmldoc.CreateElement("HireDate");

//创建子节点的文字描述

XmlText fnametext = xmldoc.CreateTextNode(dr["fname"].ToString());

XmlText lnametext = xmldoc.CreateTextNode(dr["lname"].ToString());

XmlText jobidtext = xmldoc.CreateTextNode(dr["job_id"].ToString());

XmlText joblvtextl = xmldoc.CreateTextNode(dr["job_lvl"].ToString());

XmlText hiredatetext = xmldoc.CreateTextNode(dr["hire_date"].ToString());

//将文字描述加到子节点

FName.AppendChild(fnametext);

LName.AppendChild(lnametext);

JobID.AppendChild(jobidtext);

JobLvl.AppendChild(joblvtextl);

HireDate.AppendChild(hiredatetext);

/**//*上面两段也可以通过这段来代替

FName.InnerText = dr["fname"].ToString();

LName.InnerText = dr["lname"].ToString();

JobID.InnerText = dr["job_id"].ToString();

JobLvl.InnerText = dr["job_lvl"].ToString();

HireDate.InnerText = dr["hire_date"].ToString();

*/

//将子节点加到父节点

parentNode.PrependChild(FName);

parentNode.PrependChild(LName);

parentNode.PrependChild(JobID);

parentNode.PrependChild(JobLvl);

parentNode.PrependChild(HireDate);

}

//保存成xml文件

xmldoc.Save(fileName);

}

/**//// <summary>

/// 添加一个节点

/// </summary>

/// <param name="fileName"></param>

public void AddNewNode(string fileName)

{

XmlDocument xmldoc = new XmlDocument();

xmldoc.Load(fileName);

//找到根节点

XmlNode rootNode = xmldoc.SelectSingleNode("Employeers");

//找到子节点

XmlElement parentNode = xmldoc.CreateElement("Employeer");

parentNode.SetAttribute("ID", "EMPID");

//创建Employeer节点下的子节点

XmlElement FName = xmldoc.CreateElement("FirstName");

XmlElement LName = xmldoc.CreateElement("LastName");

XmlElement JobID = xmldoc.CreateElement("JobID");

XmlElement JobLvl = xmldoc.CreateElement("JobLvl");

XmlElement HireDate = xmldoc.CreateElement("HireDate");

FName.InnerText = "FName";

LName.InnerText = "LName";

JobID.InnerText = "JOBID";

JobLvl.InnerText = "JOBLVL";

HireDate.InnerText = "HIREDATE";

parentNode.PrependChild(FName);

parentNode.PrependChild(LName);

parentNode.PrependChild(JobID);

parentNode.PrependChild(JobLvl);

parentNode.PrependChild(HireDate);

//将新创建的Employeer子节点点加入到根节点。

rootNode.AppendChild(parentNode);

xmldoc.Save(fileName);

}

/**//// <summary>

/// 修改节点

/// </summary>

/// <param name="filename"></param>

private void UpdateNode(string filename)

{

XmlDocument xmldoc = new XmlDocument();

xmldoc.Load(filename);

//得到根节点的所有子节点

XmlNodeList nodeList = xmldoc.SelectSingleNode("Employeers").ChildNodes;

foreach (XmlNode node in nodeList)

{

XmlElement xe = (XmlElement)node;//强制转换成XmlElement类型。

if (xe.GetAttribute("ID") == "001")

{

XmlNodeList xnodeList = xe.ChildNodes;

foreach (XmlNode xnode in xnodeList)

{

XmlElement xex = (XmlElement)xnode;

if (xex.Name == "FirstName")

{

xex.InnerText = xex.InnerText + "Test";

}

}

}

}

xmldoc.Save(filename);

}

/**//// <summary>

/// 删除节点

/// </summary>

/// <param name="filename"></param>

public void DeleteNode(string filename)

{

XmlDocument xmldoc = new XmlDocument();

xmldoc.Load(filename);

XmlNodeList nodelist = xmldoc.SelectSingleNode("Employeers").ChildNodes;

foreach (XmlNode node in nodelist)

{

XmlElement xe = (XmlElement)node;//强制转换成XmlElement类型。

//xe.RemoveAttribute("ID");删除节点的ID属性。

if (xe.GetAttribute("ID") == "001")

{

XmlNodeList xnodeList = xe.ChildNodes;

foreach (XmlNode xnode in xnodeList)

{

XmlElement xex = (XmlElement)xnode;

if (xex.Name == "FirstName")

{

xe.RemoveChild(xex);//删除一个节点

}

}

}

}

xmldoc.Save(filename);

}

读取上面保存的xml文件就容易多了直接调用DataSet的ReadXml方法就可以。

DataSet ds = new DataSet();

ds.ReadXml(@"c:/temp/emp.xml");