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

public static class ReflectionUtility
{
    public static IEnumerable<FieldInfo> GetAllFields(object target, Func<FieldInfo, bool> predicate)
    {
        List<Type> types = new List<Type>()
            {
                target.GetType()
            };

        while (Enumerable.Last(types).BaseType != null)
            types.Add(Enumerable.Last(types).BaseType);

        for (int i = types.Count - 1; i >= 0; i--)
        {
            IEnumerable<FieldInfo> fieldInfos = types[i]
                .GetFields(BindingFlags.Instance | BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.DeclaredOnly)
                .Where(predicate);

            foreach (var fieldInfo in fieldInfos)
                yield return fieldInfo;
        }
    }

    public static IEnumerable<PropertyInfo> GetAllProperties(object target, Func<PropertyInfo, bool> predicate)
    {
        List<Type> types = new List<Type>()
            {
                target.GetType()
            };

        while (Enumerable.Last(types).BaseType != null)
            types.Add(Enumerable.Last(types).BaseType);

        for (int i = types.Count - 1; i >= 0; i--)
        {
            IEnumerable<PropertyInfo> propertyInfos = types[i]
                .GetProperties(BindingFlags.Instance | BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.DeclaredOnly)
                .Where(predicate);

            foreach (var propertyInfo in propertyInfos)
                yield return propertyInfo;
        }
    }

    public static IEnumerable<MethodInfo> GetAllMethods(object target, Func<MethodInfo, bool> predicate)
    {
        IEnumerable<MethodInfo> methodInfos = target.GetType()
            .GetMethods(BindingFlags.Instance | BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public)
            .Where(predicate);

        return methodInfos;
    }

    public static FieldInfo GetField(object target, string fieldName) =>
        GetAllFields(target, f => f.Name.Equals(fieldName, StringComparison.InvariantCulture)).FirstOrDefault();

    public static PropertyInfo GetProperty(object target, string propertyName) =>
        GetAllProperties(target, p => p.Name.Equals(propertyName, StringComparison.InvariantCulture)).FirstOrDefault();

    public static MethodInfo GetMethod(object target, string methodName) =>
        GetAllMethods(target, m => m.Name.Equals(methodName, StringComparison.InvariantCulture)).FirstOrDefault();
}