Undesired results appending new child nodes using

问题:

What I planned was to append <image>@matchedFilePathToAnImageHere</image> only to those <item></item> nodes whose values between <name></name> tags, when converted to lower case, replaced spaces with underscores and etc, would match actual image file names in a separate folder.

The code properly matches about 95% of images to the items, but ends up appending every matched image file name with <image></image> to the very first <item></item>.

How would I append every <image></image> to their appropriate <item></item>? Every item needs only one image.

Images folder:

name1.jpg

name_2.jpg

name3.jpg

...

name 998.jpg

XML(before parsing):

<items>
 <item>
  <name>Name1</name>
  <price>Price1</price>
  <description>Description1</description>
 </item>
 <item>
  <name>Name2</name>
  <price>Price2</price>
  <description>Description2</description>
 </item>
 <item>
  <name>Name3</name>
  <price>Price3</price>
  <description>Description3</description>
 </item>
</items>

XML(desired result after parsing):

<items>
 <item>
  <name>name1</name>
  <price>Price1</price>
  <description>Description1</description>
  <image>C:\path\to\name1.jpg</image>
 </item>
 <item>
  <name>Name2</name>
  <price>Price2</price>
  <description>Description2</description>
      <!-- no image file name matched `name2`(command line notice), so skip appending image tags here BUT I add the image tag here later by hand, because I find out that there's an image `name_2.jpg` -->
 </item>
     <item>
  <name>Name3</name>
  <price>Price3</price>
  <description>Description3</description>
  <image>C:\path\to\name3.jpg</image>
 </item>
</items>

Code:

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

namespace myXmlParser
{
    class Program
    {
        static void Main(string[] args)
        {
            // load the xml
            XmlDocument doc = new XmlDocument();
            doc.Load(@"C:\items.xml");


            // retrieve the values between <name></name> for the every item element
            XmlNodeList nodes = doc.SelectNodes("//item/name/text()");

            // convert every extracted name value to lower case
            // replace spaces with underscores
            // remove the ' symbols
            // to have higher chance of matching images' file names
            // ",_the" and "_,a" replaces don't seem to work( oh well )
            for (int i = 0; i < nodes.Count; i++)
            {

                // do the magic!
                string searchKeyword = nodes.Item(i).Value.Replace(" ", "_").Replace("'","").Replace(",_the",(string)"").Replace(",_a","").ToLower();

                //Console.WriteLine(searchKeyword);

                // Now find me any images whose filenames match the searchKeyword minus the extensions
                string[] filePaths = Directory.GetFiles(@"C:\images", searchKeyword + "*", SearchOption.TopDirectoryOnly);

                // if something was found/matched then append <image>@pathToImageHere</image> to the current
                // item node, otherwise log any item nodes that didn't have a match to an image
                // ! Doesn't APPEND properly !
                if (filePaths.Length > 0)
                {
                    XmlDocumentFragment frag = doc.CreateDocumentFragment();
                    frag.InnerXml = @"<image>" + filePaths[0] + @"</image>";
                    doc.DocumentElement.FirstChild.AppendChild(frag);
                }
                else
                {
                    Console.WriteLine("NO IMAGE WAS FOUND!!! {0}", searchKeyword);
                }

                //Console.WriteLine(filePaths[j]);
                //foreach (string filePath in filePaths)
                //{
                    //blah  
                //}
            }

            // now save the new parsed xml somewhere
            doc.Save("items_with_images.xml");

            Console.ReadKey();

        }// main
    }// class
}// namespace

回答1:

doc.DocumentElement.FirstChild.AppendChild(frag);

Why do you append to the first child of the document. Aren't you expected to append to the current node?

 nodes.Item(i).ParentNode.ParentNode.AppendChild(frag);