C# Object Serialization for GameSparks Objects. https://docs.gamesparks.com/tutorials/database-access-and-cloud-storage/c-sharp-object-serialization-for-gamesparks.html

GameSparksHelpers.cs

using GameSparks.Core;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class GSDataHelpers {

    /** Converts a serializable object into GameSparks compatible GSData. */
    public static GSData ObjectToGSData(object obj) {
        GSRequestData gsData = new GSRequestData();
        gsData.AddString("type", obj.GetType().ToString());

        foreach(var field in obj.GetType().GetFields()) {
            if(!field.IsNotSerialized && field.GetValue(obj) != null) {
                if(field.FieldType == typeof(string)) {
                    gsData.AddString(field.Name, field.GetValue(obj).ToString());
                } else if(field.FieldType == typeof(bool)) {
                    gsData.AddBoolean(field.Name, bool.Parse(field.GetValue(obj).ToString()));
                } else if(field.FieldType == typeof(int)) {
                    gsData.AddNumber(field.Name, (int)Convert.ToInt32(field.GetValue(obj)));
                } else if(field.FieldType == typeof(float) || field.GetValue(obj).GetType() == typeof(double)) {
                    gsData.AddNumber(field.Name, Double.Parse(field.GetValue(obj).ToString()));
                } else if(field.FieldType == typeof(List<string>) || field.GetValue(obj).GetType() == typeof(string[])) {
                    gsData.AddStringList(field.Name,  (field.FieldType == typeof(List<string>)) ? field.GetValue(obj) as List<string> : new List<string>(field.GetValue(obj) as string[]));
                } else if(field.FieldType == typeof(List<int>) || field.GetValue(obj).GetType() == typeof(int[])) {
                    gsData.AddNumberList(field.Name,  (field.FieldType == typeof(List<int>)) ? field.GetValue(obj) as List<int> : new List<int>(field.GetValue(obj) as int[]));
                } else if(field.FieldType == typeof(List<float>) || field.GetValue(obj).GetType() == typeof(float[])) {
                    gsData.AddNumberList(field.Name,  (field.FieldType == typeof(List<float>)) ? field.GetValue(obj) as List<float> : new List<float>(field.GetValue(obj) as float[]));
                } else if(field.FieldType  == typeof(DateTime)) {
                    gsData.AddDate(field.Name, (DateTime)field.GetValue(obj));
                } else if(field.FieldType.IsClass && !field.FieldType.IsGenericType) {
                    gsData.AddObject(field.Name, ObjectToGSData(field.GetValue(obj)));
                } else if (field.FieldType.IsGenericType && field.FieldType.GetGenericTypeDefinition() == typeof(List<>) || field.FieldType.IsArray) {
                    List<GSData> gsDataList = new List<GSData>();
                    foreach(var elem in field.GetValue(obj) as IList) {
                        gsDataList.Add(ObjectToGSData(elem));
                    }
                    gsData.AddObjectList(field.Name, gsDataList);
                }
            }
        }

        Debug.LogWarning(gsData.JSON);
        return gsData;
    }

    /** Converts GSData to the corresponding class. */
    public static object GSDataToObject(GSData gsData) {
        Debug.LogWarning(gsData.JSON);

        Type objType = Type.GetType(gsData.GetString("type"));
        object obj = Activator.CreateInstance(objType);
        foreach(var typeField in objType.GetFields()) {
            if(!typeField.IsNotSerialized && gsData.ContainsKey(typeField.Name)) {
                if(typeField.FieldType == typeof(string)) {
                    typeField.SetValue(obj, gsData.GetString(typeField.Name));
                } else if(typeField.FieldType == typeof(int)) {
                    typeField.SetValue(obj, (int)gsData.GetNumber(typeField.Name).Value);    
                } else if(typeField.FieldType == typeof(float)) {
                    typeField.SetValue(obj, (float)gsData.GetFloat(typeField.Name).Value);    
                } else if(typeField.FieldType == typeof(bool)) {
                    typeField.SetValue(obj, gsData.GetBoolean(typeField.Name));    
                } else if(typeField.FieldType == typeof(DateTime)) {
                    typeField.SetValue(obj, gsData.GetDate(typeField.Name));    
                } else if((typeField.FieldType == typeof(List<string>) || typeField.FieldType == typeof(string[]) )) {
                    typeField.SetValue(obj, (typeField.FieldType == typeof(List<string>)) ? (object)gsData.GetStringList(typeField.Name) : gsData.GetStringList(typeField.Name).ToArray());  
                } else if((typeField.FieldType == typeof(List<int>) || typeField.FieldType == typeof(int[]))) {
                    typeField.SetValue(obj, (typeField.FieldType == typeof(List<int>)) ? (object)gsData.GetIntList(typeField.Name) : gsData.GetIntList(typeField.Name).ToArray());    
                } else if((typeField.FieldType == typeof(List<float>) || typeField.FieldType == typeof(float[]))) {
                    typeField.SetValue(obj, (typeField.FieldType == typeof(List<float>)) ? (object)gsData.GetFloatList(typeField.Name) : gsData.GetFloatList(typeField.Name).ToArray());    
                } else if(typeField.FieldType.IsClass && !typeField.FieldType.IsGenericType && !typeField.FieldType.IsArray) {
                    typeField.SetValue(obj, GSDataToObject(gsData.GetGSData(typeField.Name)));
                } else if(!typeField.FieldType.IsArray && typeof(IList).IsAssignableFrom(typeField.FieldType)) {
                    IList genericList = Activator.CreateInstance(typeField.FieldType) as IList;
                    foreach(GSData gsDataElem in gsData.GetGSDataList(typeField.Name)) {
                        object elem = GSDataToObject(gsDataElem);
                        genericList.Add(elem);
                    }
                    typeField.SetValue(obj, genericList);
                } else if(typeField.FieldType.IsArray) {
                    List<GSData> gsArrayData = gsData.GetGSDataList(typeField.Name);
                    // create a new instance of the array. The Activator class cannot do this for arrays //
                    // so this will create a new array of types inside the array, with the count of what is in the gsdata list //
                    Array newArray = Array.CreateInstance(typeField.FieldType.GetElementType(), gsArrayData.Count);
                    object[] objArray = new object[gsArrayData.Count]; // create a new array of objects where the serialized objects will be kept
                    for(int i = 0; i < gsArrayData.Count; i++) {
                        objArray[i] = GSDataToObject(gsArrayData[i]); // convert the JSON data inside the list to an object
                    }
                    Array.Copy(objArray, newArray, objArray.Length); //covert the object[] to the original type
                    typeField.SetValue(obj, newArray);
                }
            }
        }

        return obj;
    }

    /** Returns the size of the data in bytes. */
    public static int SizeOfGSData(GSData data) {
        return data.JSON.Length * sizeof(char);
    }
}