C# 本地xml文件进行增删改查

项目添加XML文件：FaceXml.xml,并复制到输出目录

FaceXml.xml

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

<faces>
<face>
<faceid></faceid>
<facebyte>/facebyte>
</face>
</faces>

项目添加XmlHelper帮助类

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

namespace AvoidMisplace
{
public class XmlHelper
{
//项目输出目录的FaceXml.xl文件位置
public static string facepath = AppDomain.CurrentDomain.BaseDirectory + "FaceXml.xml";

//查询是否存在faceid值为num的节点
public static bool QueryFaceXml(string num)
{
try
{
XDocument xml = XDocument.Load(facepath);
XElement face = (from item in xml.Element("faces").Elements()
where item.Element("faceid").Value == num
select item).SingleOrDefault();
if (face != null)
{
return true;
}
else
{
return false;
}
}
catch (Exception ex)
{
return false;
}
}

//获取所有faces节点下facebyte值
public static List<string> GetFaceXml()
{
try
{
XDocument xml = XDocument.Load(facepath);
var query = (from item in xml.Element("faces").Elements()
select item.Element("faceid").Value).ToList();
return query;
}
catch (Exception)
{
return null;
}
}

//查询faceid值为num的节点对应facebyte值，
public static byte[] ReadFaceXml(string num)
{
try
{
XDocument xml = XDocument.Load(facepath);
var query = (from item in xml.Element("faces").Elements()
where item.Element("faceid").Value == num
select item).SingleOrDefault();
return query.Element("facebyte").Value;
}
catch (Exception ex)
{
return null;
}
}

//新增一个face节点写入键值对
public static bool WriteFaceXml(string num, byte[] array)
{
try
{
XDocument xml = XDocument.Load(facepath);
XElement face = new XElement("face", new XElement("faceid", num), new XElement("facebyte", array));
xml.Element("faces").Add(face);
xml.Save(facepath);
//LogHelper.Debug("xml添加：" + num + ",成功");
return true;
}
catch (Exception ex)
{
//LogHelper.Error("xml添加：" + num + "," + ex.Message);
return false;
}
}

//删除faceid值为num的节点
public static bool DelFaceXml(string num)
{
try
{
XDocument xml = XDocument.Load(facepath);
XElement face = (from item in xml.Element("faces").Elements()
where item.Element("faceid").Value == num
select item).SingleOrDefault();
if (face != null)
{
face.Remove();
xml.Save(facepath);
//LogHelper.Debug("xml删除：" + num + ",成功");
return true;
}
else
{
//LogHelper.Debug("xml无：" + num);
return false;
}
}
catch (Exception ex)
{
//LogHelper.Error("xml删除：" + num + "," + ex.Message);
return false;
}
}

}
}