Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

C# Querying With LINQ Functional Programming in C# LINQ Method Syntax

Jeffrey Otano
Jeffrey Otano
3,099 Points

Not sure what I am doing wrong here?

Add a new method named ReverseNumbers that has a return type of IEnumerable<int> and uses a LINQ query to return the _numbers variable in reverse order.

NumberAnalysis.cs
using System.Collections.Generic;
using System.Linq;

namespace Treehouse.CodeChallenges
{
    public class NumberAnalysis
    {
        private List<int> _numbers;
        public NumberAnalysis()
        {
            _numbers = new List<int> { 2, 4, 6, 8, 10 };
        }

        public IEnumerable<int> ReverseNumbers()
        {
            return _numbers.OrderbyDescending(n => n);          
        }

        public IEnumerable<int> NumbersGreaterThanFive()
        {
            return _numbers.Where(n => n > 5 );  //from n in _numbers where n > 5 select n;
        }
    }
}

1 Answer

Thor Giversen
Thor Giversen
771 Points

Your Code should definitely work. Below is my solution which worked fine. i´ve experienced similar issues and the fix i found was simply to submit my code using a different browser. The browser that finally worked for me was Chrome.

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

namespace Treehouse.CodeChallenges
{
    public class NumberAnalysis
    {
        private List<int> _numbers;
        public NumberAnalysis()
        {
            _numbers = new List<int> { 2, 4, 6, 8, 10 };
        }

        public IEnumerable<int> NumbersGreaterThanFive()
        {
            return _numbers.Where(n => n>5);
        }

        public IEnumerable<int> ReverseNumbers()
        {
            return _numbers.OrderByDescending(n => n); 
        }
    }
}