XML Serializer object's property retuns null

Unity Engine
1

HI ,

I am trying to create a data class from a xml file . it’s work great on element and it give me it;s information ( attribute , … ) but when it comes to element that is implemented by another class and has a instance in class … it’s return NULL …

XML_Importer :

    using UnityEngine;
    using System.Collections;
    using System.Collections.Generic;
    
    using System.Xml;
    using System.Xml.Serialization;
    using System.IO;
    using System.Text;
    
    public class XML_Importer
    {
    
    	public static object DeserializeXML (string filePath, System.Type type)
    	{
    		XmlSerializer deserializer = new XmlSerializer(type);
    		TextReader reader = new StreamReader(filePath);
    		object instance = deserializer.Deserialize(reader);
    		reader.Close();
    
    		return instance;
    	}
    
    }

XML File :

    <?xml version="1.0" encoding="utf-8"?>
    <Sadaf xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <Objects>
        <Object Size="" Id="3" Name="Obj1" DefaultCamera="1" Model="File.model">
          <Position Type="Relative" X="" Y="" Z="">
            <RelatedTo Id="6"></RelatedTo>
          </Position>
        </Object>
      </Objects>
    </Sadaf>

DataClass :

    using UnityEngine;
    using System.Collections;
    using System.Xml;
    using System.Xml.Serialization;
    
    [XmlRoot("Sadaf")]
    
    public class Sadaf
    {
    	[XmlArray("Objects"), XmlArrayItem("Object", typeof(Object))]
        public Object[] Objects;
    
    	public class Object
    	{
    		[XmlAttribute("Id")]
            public int id { get; set; }
    
    		[XmlAttribute("Name")]
            public string name { get; set; }
    		
    		[XmlAttribute("DefaultCamera")]
            public int defualtCamera { get; set; }
    
    		[XmlAttribute("Model")]
            public string model { get; set; }
    
            [XmlElement("MetaData")]
            public MetaData metaData;
    
            //[XmlElement("Position")]
            public Position position;
    	}
    
        public class Position
        {
            [XmlAttribute("Type")]
            public string type { get; set; }
    
            [XmlAttribute("X")]
            public int x { get; set; }
    
            [XmlAttribute("Y")]
            public int y { get; set; }
    
            [XmlAttribute("Z")]
            public int z { get; set; }
    
            public RelatedTo relatedTo { get; set; }
        }
    
        public class RelatedTo
        {
            [XmlAttribute("Id")]
            public int id { get; set; }
        }
    }

DataClass temp = (DataClass)XML_Importer.DeserializeXML("test_XML.xml", typeof(DataClass));
    		for (int i = 0 ; i < temp.Objects.Length ; i++)
    		{
                Debug.Log(temp.Objects[i].id);
                Debug.Log(temp.Objects[i].position.type);
                 
    		}

It;s got null reference error on " Debug.Log(temp.Objects[i].position.type); " Line …
What do you folks think is the problem ??
Thanks.

2

Why do you commented the XML Element definition for the Position member out?

          //[XmlElement("Position")]
          public Position position;

Maybe you should debug the code and check, what it null. position or type?

3

It’s Solved …

A dummy mistake … :smile: … Learned a lot today .

There was a problem in xml file that cause throwing string format error … some attributes were null and when i get them valid values … Bang … every things worked great .

Thanks for the time .