序列化的麻烦（参数对象的类型不是原始的）

Question

I'm writing an evolutionary algorithm but I'm having trouble writing some items in an XML file. The error I'm recieving is

InvalidOperationException: The type of the argument object 'ExperimentSettings' is not primitive.

This is the code I'm working with (I left out some methods that work and are not related with the issue in any way):

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

public class SerializerTest : MonoBehaviour {

    public GameObject spawner;

    // Use this for initialization
    void Start () {
        GetComponent<Button>().onClick.AddListener(delegate { Save(false, 0, 50, 5, 5, 50, 5, new Vector3(0, 20, 0), new System.IO.DirectoryInfo("/Experiments/Test #0"), spawner.GetComponent<CreatureGenerator>()); });
    }

    // Use this for initialization
    void Save(
        bool startCreatures,
        int experimentType,
        int totalCreaturesNo,
        int cycles,
        float experimentDuration,
        float survivorsPercentage,
        float probabilityOfMutation,
        Vector3 creaturesStartingPosition,
        DirectoryInfo saveFolder,
        CreatureGenerator generator
        )
    {
        //create file where to save the settings
        string settingsFile = Application.dataPath + saveFolder + "/settings_and_parameters.xml";

        if (File.Exists(settingsFile))
        {
            File.Delete(settingsFile);
        }

        XmlSerializer settingsSerializer = new XmlSerializer(typeof(Creature));
        FileStream settingsStream = new FileStream(settingsFile, FileMode.Create);

        //save the settings
        ExperimentSettings thisExperiment = new ExperimentSettings()
        {
            startCreatures = startCreatures,
            experimentType = experimentType,
            totalCreaturesNo = totalCreaturesNo,
            cycles = cycles,
            experimentDuration = experimentDuration,
            survivorsPercentage = survivorsPercentage,
            probabilityOfMutation = probabilityOfMutation,
            creaturesStartingPosition = creaturesStartingPosition,
            saveFolder = new DirectoryInfo(saveFolder.ToString()),
            experimentScene = UnityEngine.SceneManagement.SceneManager.GetActiveScene().name
        };

        settingsSerializer.Serialize(settingsStream, thisExperiment);

        //close the file
        settingsStream.Close();
    }
}

In the Start function I just set up a button that when clicked saves a file with some arbitrary parameters. I'm gonna leave that code there but it's not so pertinent with the error.

This is the class that returns the error when serialized:

[System.Serializable]
public class ExperimentSettings
{
    public bool startCreatures;
    public int experimentType;
    public int totalCreaturesNo;
    public int cycles;
    public float experimentDuration;
    public float survivorsPercentage;
    public float probabilityOfMutation;
    public Vector3 creaturesStartingPosition;
    public DirectoryInfo saveFolder;
    public string experimentScene;
}

The thing that baffles me is that I tried serializing another class in the same method in the same way it actually worked. The next code block is the class that's being serialized correctly:

[System.Serializable]
public class Creature
{
    public string creaturePrefab;
    public double result;
    public bool passed;
}

I tried removing all the variables from ExperimentSettings leaving an empty class but it still doesn't work. I'm all out of ideas, any help is greatly appreciated!

Answer 1

Solved! In the line

 XmlSerializer settingsSerializer = new XmlSerializer(typeof(Creature)); 

I copy pasted from my own code but I forgot to change the class, so to solve this particular problem I'd have to edit this line this way

XmlSerializer settingsSerializer = new XmlSerializer(typeof(ExperimentSettings));