在Unity C＃中解析XML文件

Question

I have a little problem with parsing XML file to object in C#. Whole project is in Unity3D. So I have this XML file:

<Questions>
    <Question>
        <questionText>What is this?</questionText>
        <answer>blablabla</answer>
    </Question>
</Questions>

And this is my parsing class:

using UnityEngine;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Serialization;
using System.IO;
using System;

public struct Montage {
    [XmlElement("questionText")]
    public string questionText;

    [XmlElement("answer")]
    public string answer;
}

[XmlRoot("Questions"), XmlType("Questions")]
public class ConfigScene {

    [XmlArray("Questions")]
    [XmlArrayItem("Question")]
    public List<Montage> questions = new List<Montage> ();

    public static ConfigScene Load(string path) {
        try {
            XmlSerializer serializer = new XmlSerializer (typeof(ConfigScene));
            using(FileStream stream = new FileStream(path, FileMode.Open)) {
                 return serializer.Deserialize(stream) as ConfigScene;
            }
        } catch (Exception e) {
             UnityEngine.Debug.LogError ("Exception loading config file: " + e);

             return null;
        }
    }
}

I'm calling this "Load" method in camera Object in Start() method:

void Start () {
    confScene = ConfigScene.Load(Path.Combine(Application.dataPath, "Config/config2.xml"));
    foreach(Montage o in confScene.questions) {
        Debug.Log (o.questionText);
    }
}

The problem is that my questions list is empty and I didn't get any provided data into it. Do I make something wrong? Maybe someone made it before and know what is wrong with this code?

Answer 1

The XML file schema ( config2.xml ) and the XML serialization attributes in the corresponding class doesn't match. Your XML document's root element ( Questions ) and the questions list element are conflicting.

Change your XmlRoot 's ElementName (which is now Questions , line 16 in code) to something else (say Root ). Accordingly change your config2.xml file's content: enclose the entire document within a Root element as shown below.

<Root>
  <Questions>
    <Question>
      <questionText>What is this?</questionText>
      <answer>blablabla</answer>
    </Question>
  </Questions>
</Root>

Deserialization should be fine now.

Answer 2

I have to put an answer because I want to add some code here. So now I can run it and I get data. But my XML file is more nested. Here is the XML file:

<?xml version="1.0" encoding="utf-8"?>

<MontageConfig>
    <Parameters>
        <Parameter>
            <mainObject>
                <name>tableTop</name>
            </mainObject>
            <connectors>
                <connector>
                    <name>bolt</name>
                    <count>4</count>
                </connector>
                <connector>
                    <name>spike</name>
                    <count>5</count>
                </connector>
            </connectors>
        </Parameter>
    </Parameters>
</MontageConfig>

And my class:

using UnityEngine;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Serialization;
using System.IO;
using System;

public struct Connectors {
    [XmlElement("name")]
    public string connectorName;

    [XmlElement("count")]
    public int connectorCount;
}

public struct Montage
{
    [XmlElement("mainObject")]
    [XmlElement("name")]
    public string name;

    [XmlElement("connectors")]
    [XmlElement("connector")]
    public List<Connectors> connectors;

}

[XmlRoot("MontageConfig")]
public class ConfigScene
{

    [XmlArray("Parameters")]
    [XmlArrayItem("Parameter")]
    public List<Montage> questions = new List<Montage>();

    public static ConfigScene Load(string path)
    {
        try
        {
            XmlSerializer serializer = new XmlSerializer(typeof(ConfigScene));
            using (FileStream stream = new FileStream(path, FileMode.Open))
            {
                //Debug.Log(serializer.Deserialize(stream) as ConfigScene);
                return serializer.Deserialize(stream) as ConfigScene;
            }
        }
        catch (Exception e)
        {
            UnityEngine.Debug.LogError("Exception loading config file: " + e);

            return null;
        }
    }
}

The problem is with connectors. I think I didn't make it properly. So I can't get any data into this Connectors objects. Do you know maybe how to fix that?