Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

C# Querying With LINQ Now You're Querying Using Query Syntax

vincent batteast
vincent batteast
51,094 Points
Posted by vincent batteast
vincent batteast
51,094 Points

public method in the NumberAnalysis class called NumbersGreaterThanFive that returns an IEnumerable<int>.

NumberAnalysis.cs(16,49): error CS0103: The name `number' does not exist in the current context Compilation failed: 1 error(s), 0 warnings

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> NumbersGreaterThanFive()
{

  var NumbersGreaterThanFive = from _numbers in number
                                where _numbers > 5 select _numbers;  
    return NumbersGreaterThanFive;
}
}
}

3 Answers

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

You probably just have your terms exchanged.

Your code looks good except that where I would expect to see the list field "_numbers", you have "number" (and thus the error). And in the places (3 of them) where I would expect to see the name of a temporary variable (such as "number"), you have the name of the list field.

vincent batteast
vincent batteast
51,094 Points
vincent batteast
vincent batteast
51,094 Points

new error NumberAnalysis.cs(18,12): error CS0266: Cannot implicitly convert type System.Collections.Generic.IEnumerable>' toSystem.Collections.Generic.IEnumerable'. An explicit conversion exists (are you missing a cast?) Compilation failed: 1 error(s), 0 warnings

code

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()
{

  var NumbersGreaterThanFive = from number in _numbers
                                where number > 5 select _numbers;  
    return NumbersGreaterThanFive;
}
}
}
Jon Wood
Jon Wood
9,884 Points
Jon Wood
Jon Wood
9,884 Points

In your select you're selecting the IEnumerable. Do select number instead.

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points 
                                where number > 5 select _numbers;

You got the other 2, but you forgot to change that last "_numbers" to "number".