using System;

using System.Collections.Generic;

using System.Reflection;

​

[Serializable]

public struct Ser

{

    public List<int> test;

}

[Serializable]

    public class SerializedOrdersComponent

    {

        public string[] CompletedOrdersIds;

        public SerializedOrder[] ActiveOrders;

        public int[] ActiveTreesIds;

        public int[] CompletedTreesIds;

        public int IntField;

        public string StringField;

    }

​

 [Serializable]

    public class SerializedOrder

    {

        //common

        public string OrderId;

        public int OrderCharacterId;

        public double Timeleft;

        public bool Completed;

        public bool IsGenerated;

        public bool IsSingleTaskOrder;

        public double Duration;

    }

​

public static class ComponentFieldsDeserializationUtil

    {

        public static Dictionary<Type, FieldInfo[]> FieldsCache = new Dictionary<Type, FieldInfo[]>();

​

        public static void InitializeNullFields<TSerializedType>(TSerializedType serialized) where TSerializedType: class

        {

            Type type = typeof(TSerializedType);

            FieldInfo[] fields;

            if (!FieldsCache.TryGetValue(type, out fields))

            {

                fields = type.GetFields();

                FieldsCache.Add(type, fields);

            }

​

            foreach (FieldInfo fieldInfo in fields)

            {

                if (fieldInfo.GetValue(serialized) == null)

                {

                    if (fieldInfo.FieldType.IsArray)

                    {

                        fieldInfo.SetValue(serialized, Activator.CreateInstance(fieldInfo.FieldType, 0));

                    }

                    else

                    {

                        fieldInfo.SetValue(serialized, Activator.CreateInstance(fieldInfo.FieldType));

                    }

                }

            }

        }

    }

public class Program

{

    public static void Main()

    {

        SerializedOrdersComponent component = new SerializedOrdersComponent();

        ComponentFieldsDeserializationUtil.InitializeNullFields<SerializedOrdersComponent>(component);

        Console.WriteLine(component.CompletedOrdersIds);

        Console.WriteLine(component.ActiveOrders);

        Console.WriteLine(component.ActiveTreesIds);

        Console.WriteLine(component.CompletedTreesIds);

    }

}