在XElement内部获取价值

Question

I've been trying forever using Descendants, Elements and attributes to retrieve data from an XML file that I'm writing to save metadata. I can't at the moment and it's blocking my work. When I was using Linq to XML, I was yielding no value whatsoever and I couldn't under why happening.

Quick look into the xml file

    <ImageMetadata>
        <ColorHistogram>
            <Bin value="45861"/>
            <Bin value="31989"/>
        </ColorHistogram/>
        <FaceLocations>
            <FacePosition Y="379" X="205"/>
            <FacePosition Y="366" X="372"/>
        </FaceLocations>
    </ImageMetadata>

I've tried different solutions. At first, I only had an XElement called BinValue instead of the tag Bin with the attribute value which lead to this code:

  //Yielding no results

  from elements in doc.Descendants()
  let element = elements.Element("BinValue")
  select (long)element;

Then after getting mad at LINQ to XML, I changed the structure a bit of my document to have a tag and an attribute. But this have no effect whatsoever.

var bins = XElement.Load(dbMetadata)
                .Descendants("Bin")
                .Select(e => e.Attribute("value").Value);
// which gives me : System.ArgumentException: 'Illegal characters in path.'

Getting values from xelement

My use case has you could have gather from the xml structure is the following: creating metadata of an image file. That portion looks pretty solid with OpenCV and that's not my issue. Maybe in order to get more feedback on my issue, it'd be relevant to add the code I was using to build my XML document.

The portion that computes data on an image was done using F#. The part that creates the xml document was done using C#. Because of that, I'm going to create two gists to share my code. Please, remember to add the Emgu OpenCV nugget package in your solutions.

1. Image Analyzer - F#
2. XMLDocumentParser - C#

**Use any two local jpg files in order to run the F# code that will generate the metadata !

**If possible, I'd like a way to retrieve the data using LINQ to XML. For both ColorHistogram and FaceLocations

UPDATE1

I was asked in the comments to show the state of the xml file when my problems occurred. You can find it below:

Metadata file

Answer 1

Try following :

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


namespace ConsoleApplication49
{

    class Program
    {
        const string FILENAME = @"c:\temp\test.xml";
        static void Main(string[] args)
        {
            XDocument doc = XDocument.Load(FILENAME);

            var results = doc.Descendants("ImageMetadata").Select(x => new
            {
                colorHistograms = x.Descendants("ColorHistogram").Select(y => new
                {
                    bin = y.Elements("Bin").Select(z => new
                    {
                        value = (int)z.Attribute("value")
                    }).ToList()
                }).FirstOrDefault(),
                faceLocations = x.Descendants("FaceLocations").Select(y => new
                {
                    facePosition = y.Elements("FacePosition").Select(z => new
                    {
                        X = (int)z.Attribute("X"),
                        Y = (int)z.Attribute("Y")
                    }).ToList()
                }).FirstOrDefault()

            }).FirstOrDefault();


        }
    }


}