XML基本读，写，删除操作

XML 数据格式如下：
<?xml version="1.0" encoding="utf-8"?>
<PeopleInfo>
  <PeopleInfoList str_Epc="350000000000000000000000" str_name="chpdirect">
    <str_PeopleID>peopleid0000</str_PeopleID>
    <str_PeopleName>peoplename0000</str_PeopleName>
    <str_PeopleUnit>11111111111</str_PeopleUnit>
  </PeopleInfoList>
</PeopleInfo>

一：创建主架构的 XML 文件

XmlWriterSettings settring = new XmlWriterSettings ();
settring .Indent = true ;
settring .NewLineOnAttributes = true ;
XmlWriter writer = XmlWriter .Create (CommonUseXMLPrevFilePath , settring );
writer .WriteStartDocument ();
writer .WriteStartElement ("PeopleInfo" );
writer .WriteEndElement ();
writer .WriteEndDocument ();
writer .Flush ();
writer .Close ();

二：添加数据

if (!File .Exists (CommonUseXMLPrevFilePath ))
{
    CreateXMLFile ();
}
this .document .Load (CommonUseXMLPrevFilePath );
XmlElement vehNode = this .document .CreateElement ("PeopleInfoList" );
vehNode .SetAttribute ("str_Epc" , epc );
vehNode .SetAttribute ("str_name" , "chp" );
XmlElement prev_livestock_ID = this .document .CreateElement ("str_PeopleID" );
prev_livestock_ID .InnerText = id ;
XmlElement prev_time = this .document .CreateElement ("str_PeopleName" );
prev_time .InnerText = name ;
XmlElement prev_address = this .document .CreateElement ("str_PeopleUnit" );
prev_address .InnerText = unit ;
vehNode .AppendChild (prev_livestock_ID );
vehNode .AppendChild (prev_time );
vehNode .AppendChild (prev_address );
//this.document.GetElementsByTagName("PeopleInfo")[0].AppendChild(vehNode);
this .document .SelectSingleNode ("PeopleInfo" ).AppendChild (vehNode );
this .document .Save (CommonUseXMLPrevFilePath );

三：修改数据

if (!File .Exists (CommonUseXMLPrevFilePath ))
{
    CreateXMLFile ();
}
this .document .Load (CommonUseXMLPrevFilePath );
XmlNodeList nodeList = this .document .SelectSingleNode ("PeopleInfo" ).ChildNodes ;
foreach (XmlNode xn in nodeList )
{
    XmlElement xe = (XmlElement )xn ;
    XmlNodeList nls = xe .ChildNodes ;
    foreach (XmlNode xn1 in nls )
    {
        XmlElement xe2 = (XmlElement )xn1 ;
        if (xe2 .Name == "str_PeopleUnit" )
        {
            xe2 .InnerText = "11111111111" ;
        }
    }
    //if (xe.GetAttribute("str_name") == "chp")
    //{
        //xe.SetAttribute("str_name", "chpdirect");
        //XmlNodeList nls = xe.ChildNodes;
        //foreach (XmlNode xn1 in nls)
        //{
        //      XmlElement xe2 = (XmlElement)xn1;
        //      if (xe2.Name == "str_PeopleUnit")
        //      {
        //           xe2.InnerText = "00000000";
        //      }
        //}
    //}
}
this .document .Save (CommonUseXMLPrevFilePath );// 保存。

四：删除

if (!File .Exists (CommonUseXMLPrevFilePath ))
{
    CreateXMLFile ();
}
this .document .Load (CommonUseXMLPrevFilePath );
XmlNodeList nodeList = this .document .SelectSingleNode ("PeopleInfo" ).ChildNodes ;
foreach (XmlNode xn in nodeList )
{
    XmlElement xe = (XmlElement )xn ;
    if (xe .GetAttribute ("str_Epc" ) == "350000000000000000000100" )
    {
        xe .RemoveAttribute ("str_Epc" );
    }
    else if (xe .GetAttribute ("str_Epc" ) == "350000000000000000000101" )
    {
        //xe.RemoveAllAttributes();
        xe .RemoveAll ();
    }
}
this .document .Save (CommonUseXMLPrevFilePath );// 保存。