Search type (base or interface) in type with ability to search concrete type by generic type definition

TypeExtensions.cs

using System;

namespace DataAccess
{
    public static class TypeExtensions
    {
        public static Type? SearchType(this Type type, Type searchType)
        {
            return searchType.IsInterface
                ? SearchInterfaceType(type, searchType)
                : SearchBaseType(type, searchType);

            static Type? SearchInterfaceType(Type type, Type searchType)
            {
                foreach (var interfaceType in type.GetInterfaces())
                {
                    var searchedType = CompareType(interfaceType, searchType);
                    if (searchedType != null)
                    {
                        return searchType;
                    }
                }

                return null;
            }

            static Type? SearchBaseType(Type type, Type searchType)
            {
                Type? currentType = type;
                while (currentType != null)
                {
                    var searchedType = CompareType(currentType, searchType);
                    if (searchedType != null)
                    {
                        return searchType;
                    }

                    currentType = currentType.BaseType;
                }

                return null;
            }

            static Type? CompareType(Type type, Type searchType)
            {
                var compareType = type;
                if (searchType.IsGenericTypeDefinition && type.IsGenericType)
                {
                    compareType = type.GetGenericTypeDefinition();
                }

                return compareType == searchType ? type : null;
            }
        }
    }
}