there was an error reflecting type (XmlSerializer)

Question

_{Saturday, September 10, 2011 2:36 PM}

My project is WPF and bases on Kinect SkeletalViewer Sample. I add a function to save Joint Collection, but the error message(as below) appear when I save the KinectJointCollection. Does somebody know how to solve this problem?

There was an error reflecting type 'FileAccessor.KinectJointCollection'.

namespace FileAccessor
{

    public class KinectJointCollection
    {
        public KinectJointCollection()
        {
            Joints = new List<JointsCollection>();
        }

        public List<JointsCollection> Joints;
    }

    public static class XMLAccessor
    {
        public static bool SaveKinectKeyFrameToXML(string filename, KinectJointCollection kJointCollection)
        {
            FileStream stream = File.Open(filename, FileMode.Create);

            XmlSerializer serializer = new XmlSerializer(typeof(KinectJointCollection));
            serializer.Serialize(stream, kJointCollection);

            stream.Close();

            return true;
        }

akira32 編程之家 Yahoo http://tw.myblog.yahoo.com/akira32-akira32

All replies (10)

_{Monday, September 12, 2011 12:32 PM ✅Answered}

Yes the XMLSerializer will only serialize the public members.  If you have private member variables they will not get serialized, except indirectly if there is an exposed property that has a get on the private variable.   Likewise, if you have a read only property it won't get serialized.Tom Overton

_{Saturday, September 10, 2011 4:13 PM}

Maybe JointsCollection is an object that is not serializable?  Tom Overton

_{Saturday, September 10, 2011 4:14 PM}

Hi

What is the InnerException?...Generally in this case it gives clear description what property XMLSerializer find difficulty to deal with...

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_{Saturday, September 10, 2011 4:45 PM}

using System;
using System.Collections;
using System.Reflection;

namespace Microsoft.Research.Kinect.Nui
{
    public class JointsCollection : IEnumerable
    {
        public int Count { get; }

        public Joint this[JointID i] { get; set; }

        public IEnumerator GetEnumerator();
    }
}

Sorry! How do I see the InnerException? The Joint seems to have Non-Public Member. But I cannot modify the Joint Class.

akira32 編程之家 Yahoo http://tw.myblog.yahoo.com/akira32-akira32

_{Saturday, September 10, 2011 5:34 PM}

akira32,

Are you using a yield return to return your collection?  if so I believe that would make it not serializable. 

Also, does the Join class have a parameterless default public constructor?  The XMLSerializer will complain about this if it doesn't (which you can see in the inner exception).

Tom Overton

_{Sunday, September 11, 2011 1:31 AM}

If JointCollection does not have a public parameterless constructor, it will not be xml serializable.  Try adding a default constructor as below:

    public JointsCollection() {}

--
Mike

_{Sunday, September 11, 2011 11:03 AM}

JointCollection also does not have public member variables.akira32 編程之家 Yahoo http://tw.myblog.yahoo.com/akira32-akira32

_{Sunday, September 11, 2011 11:35 AM}

The fact of whether a class has public member variables would not prevent a class from being XmlSerialized. 

Because of this, I am unsure of what your last post is trying to state.

--
Mike

_{Sunday, September 11, 2011 12:13 PM}

JointCollection also does not have public member variables.

That wouldn't make a difference.  It's the fact that JointCollection (and maybe Joint) classes don't have a parameterless public constructor that's most likely the cause of the serialization error.Tom Overton

_{Monday, September 12, 2011 10:53 AM}

Does XML Serialize only export the public member variables?akira32 編程之家 Yahoo http://tw.myblog.yahoo.com/akira32-akira32