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C# Querying With LINQ Querying the BirdWatcher Data Bird Search In Action

Daniel Hildreth
Daniel Hildreth
16,170 Points
Posted by Daniel Hildreth
Daniel Hildreth
16,170 Points

Bird Search In Action Error

So I am following the video in the Bird Search In Action within the Querying with LINQ course. I got a source error for my code when I tried to compile. Below are my Program.cs and BirdSearchExtension.cs:

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BirdWatcher
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var searchParameters = new BirdSearch
            {
                Size = "Medium",
                Country = "Unnited States",
                Colors = new List<string> { "White", "Brown", "Black" },
                Page = 0,
                PageSize = 5
            };

            Console.WriteLine("Type any key to begin search");

            var birds = BirdRepository.LoadBirds();

            while(Console.ReadKey().KeyChar != 'q')
            {
                Console.WriteLine($"Page: {searchParameters.Page}");

                birds.Search(searchParameters).ToList().ForEach(b =>
                {
                    Console.WriteLine($"CommonName: {b.CommonName}");
                });

                searchParameters.Page++;
            }
        }
    }
}

BirdSearchExtension.cs

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

namespace BirdWatcher
{
  public class BirdSearch
  {
      public string CommonName { get; set; }
      public List<string> Colors { get; set; }
      public string Country { get; set; }
      public string Size { get; set; }
      public int Page { get; set; }
      public int PageSize { get; set; }
  }

  public static class BirdSearchExtension
  {
      public static IEnumerable<Bird> Search(this IEnumerable<Bird> source, Birdsearch search)
      {
          return source.Where(s => search.CommonName == null || s.CommonName.Contains(search.CommonName))
                       .Where(s => search.Country == null || s.Habitats.Any(h => h.Country.Contains(search.Country)))
                       .Where(s => search.Size == null || b.Size == search.Size)
                       .Where(s => search.Colors.Any(c => c == s.PrimaryColor) ||
                                   search.Colors.Any(c => c == s.SecondaryColor) ||
                                   search.Colors.Join(s.TertiaryColors, 
                                                      sc => sc,
                                                      tc => tc,
                                                      (sc, tc) => (sc)).Any())
                       .Skip(page * pageSize)
                       .Take(pageSize);
      }
  }
}

This is the compiler error. The first error where it talked about the readme.md, I commented out thinking that's what it meant by the readme.md errors, and that is how I got the second error list.

1)
treehouse:~/workspace$ mcs * .cs -out:Program.exe

error CS2015: Source file `BirdWatcher.dll' is a binary file and not a text file                                                                                
readme.md(1,0): error CS1525: Unexpected symbol `The'                                                                                                           
readme.md(5,15): error CS1040: Preprocessor directives must appear as the first non-whitespace character on a line                                              
error CS2001: Source file `.cs' could not be found                                                                                                              
Compilation failed: 4 error(s), 0 warnings                                                                                                                     

2) (After commenting out entire readme.md file)
treehouse:~/workspace$ mcs * .cs -out:Program.exe                                                                                                               

error CS2015: Source file `BirdWatcher.dll' is a binary file and not a text file                                                                                
readme.md(1,0): error CS1525: Unexpected symbol `<'                                                                                                             
readme.md(6,15): error CS1040: Preprocessor directives must appear as the first non-whitespace character on a line                                              
error CS2001: Source file `.cs' could not be found                                                                                                              
Compilation failed: 4 error(s), 0 warnings

1 Answer

Steven Parker
Steven Parker
231,198 Points
Steven Parker
Steven Parker
231,198 Points

:point_right: Your whole issue might be just a stray space.

Looking at your compile command:

treehouse:~/workspace$ mcs * .cs -out:Program.exe

I noticed you have a space between the asterisk "*" and the ".cs". You probably intended to write "*.cs" which is a wildcard sequence that means "every file with a name that ends with .cs". But with the space it means "every file with a conventional name, plus one named .cs" (almost certainly not what you intended).