public async Task <IEnumerable <Developer> > GetDevelopersBySkillAsync(int skillLevel = 0)
{
if (skillLevel < 0)
{
throw new ServiceParameterException("Skill level cannot be negative");
}
var allDevelopers = await _apiClient.Execute(new GetAllDevelopersRequest());
return(from developer in allDevelopers
let types = developer.Skills.Where(s => s.Level >= skillLevel).Select(s => s.Type).Distinct().ToList()
where types.Count > 0
let skills = developer.Skills.Where(s => types.Contains(s.Type)).ToList()
select new Developer()
{
Age = developer.Age,
FirstName = developer.FirstName,
LastName = developer.LastName,
Skills = skills
});
}