using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;

public static class ReflectionExtensions
{
    public static IEnumerable<FieldInfo> GetAllFields(this Type type)
    {
        if (type == null)
        {
            return new List<FieldInfo>();
        }

        BindingFlags flags = BindingFlags.Public | BindingFlags.NonPublic | 
                             BindingFlags.Static | BindingFlags.Instance | 
                             BindingFlags.DeclaredOnly;

        return type.GetFields(flags).Concat(GetAllFields(type.BaseType));
    }

    public static FieldInfo GetAllField(this Type type, string fieldName)
    {
        if (type == null)
        {
            return null;
        }

        BindingFlags flags = BindingFlags.Public | BindingFlags.NonPublic | 
                             BindingFlags.Static | BindingFlags.Instance;

        return type.GetField(fieldName, flags) ?? GetAllField(type.BaseType, fieldName);
    }
}