LINQ To XML:根据一个XML覆盖另一个XML节点内容

现有两个结构一样，但部分节点内容不同的XML文件，需要根据一个XML的ID节点，覆盖另一个XML节点内容.

XML结构如下

<?xml version="1.0" encoding="gb2312"?>
<Xml>
  <Data>
    <ElementMatchModel id="3b226203-f535-4bdd-bedf-0e42503d613d" name="bxline_bxpoint_0">
      <Link>3b226203-f535-4bdd-bedf-0e42503d613d.usx</Link>
      <BuildingSource></BuildingSource>
      <SphericalTransform>
        <Location>118.0850858401120900,24.4822235205172980,-1.5400000000000000</Location>
      </SphericalTransform>
      <BBox>
        <MinBoundary>0.0000000000000000,0.0000000000000000,0.0000000000000000</MinBoundary>
        <MaxBoundary>0.0000000000000000,0.0000000000000000</MaxBoundary>
      </BBox>
      <LonLatRect>0.0000000000000000,0.0000000000000000</LonLatRect>
    </ElementMatchModel>
    <ElementMatchModel id="427b5a0e-62e3-4c66-bf5a-5d435c60b96b" name="bxline_bxpoint_1">
      <Link>427b5a0e-62e3-4c66-bf5a-5d435c60b96b.usx</Link>
      <BuildingSource></BuildingSource>
      <SphericalTransform>
        <Location>118.0852246123423700,24.4819580362325690,-1.5600000000000001</Location>
      </SphericalTransform>
      <BBox>
        <MinBoundary>0.0000000000000000,0.0000000000000000</LonLatRect>
    </ElementMatchModel>
  </Data>
</Xml>

上面是小程序的界面，分别选择两个文件

代码如下:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Xml.Linq;
using System.Diagnostics;

namespace WindowsFormsApplication1
{
    public partial class frmXml : Form
    {
        public frmXml()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender,EventArgs e)
        {
            OpenFileDialog fileDialog = new OpenFileDialog();
            fileDialog.CheckFileExists = true;
            fileDialog.CheckPathExists = true;

            //判断用户是否正确的选择了文件 
            if (fileDialog.ShowDialog() == DialogResult.OK)
            {
                //获取用户选择的文件
                FileInfo fileInfo = new FileInfo(fileDialog.FileName);
                textBox1.Text = fileInfo.FullName;
            }
        }

        private void button2_Click(object sender,EventArgs e)
        {
            OpenFileDialog fileDialog = new OpenFileDialog();
            fileDialog.CheckFileExists = true;
            fileDialog.CheckPathExists = true;

            //判断用户是否正确的选择了文件 
            if (fileDialog.ShowDialog() == DialogResult.OK)
            {
                //获取用户选择的文件
                FileInfo fileInfo = new FileInfo(fileDialog.FileName);
                textBox2.Text = fileInfo.FullName;
            }
        }

        private void button3_Click(object sender,EventArgs e)
        {
            if (String.IsNullOrEmpty(textBox1.Text) || String.IsNullOrEmpty(textBox2.Text))
                return;
            XDocument xdocDest = XDocument.Load(textBox1.Text); //需要覆盖的文件
            XDocument xdocSelc = XDocument.Load(textBox2.Text); //需要读取的文件

            try
            {
                //查询并返回“id”,“location”的键值对
                var dic = (from ElementMatchModel in xdocSelc.Element("Xml").Element("Data").Elements("ElementMatchModel")
                           select new
                           {
                               id = ElementMatchModel.Attribute("id").Value,location = ElementMatchModel.Element("SphericalTransform").Element("Location").Value
                           }).ToDictionary(o => o.id,o => o.location);
                foreach (KeyValuePair<string,string> pair in dic)
                {
                    var selLocCollection = from test in xdocDest.Element("Xml").Element("Data").Elements("ElementMatchModel")
                                           where test.Attribute("id").Value == pair.Key
                                           select test;
                    //如果找到相同的ID,那么就更新"Location"元素的值
                    if (selLocCollection.ToArray<XElement>().Length > 0)
                        selLocCollection.Single<XElement>().Element("SphericalTransform").Element("Location").Value = pair.Value;
                }
                //覆盖匹配的元素值后，生成一个新文件并保存
                xdocDest.Save(System.IO.Path.GetDirectoryName(Process.GetCurrentProcess().MainModule.FileName) + "\\" + "test.xml");
                MessageBox.Show("ok");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }
    }
}

上面是把需要更新的部分返回一个Dictionary,再在循环中查找并更新,原本我想用联合查询更新的，但貌似行不通，非得分几步完成,如有linq高手会用更简洁的代码写出来,不吝赐教!