How do I use Linq in MonoDevelop 2.0 on OS X?

Question

I installed MonoDevelop 2.0 on my Mac.

I created a new Console Application.

"Hello World" program runs fine.

But I can't use Linq.

using System. doesn't show Linq option.

What should I do?

Answer 1

You may need to right-click on your project in the solution view, do Options, Build, General, and set your Target Runtime to Mono / .Net 3.5 or bigger.

Then you can right-click references, do Edit References, and add a reference to System.Core to your project.

Answer 2

I'm running Monodevelop 2.0 and Mono 2.0 on Ubuntu 9.04 and lambda's and Linq work fine.

Contrary to what Thomas Levesque says, System.Core does exist in Mono. Extension methods, lambda's et al are all supported.

You need to use using System.Linq.

public static void Example1()    
{

    List<string> people = new List<string>() 
    { 
        "Granville", "John", "Rachel", "Betty", 
        "Chandler", "Ross", "Monica" 
    };

    IEnumerable<string> query = from p in people where p.Length > 5 
    orderby p select p;

    foreach (string person in query) 
    {
        Console.WriteLine(person);
    }
}

Answer 3

The Latest version of Mono Develop does support linq. On the project you must select 3.5 under Build/General/RuntimeVersion. After that you can add the System.Core reference.

Answer 4

Is your Console Application referencing the System.Core.dll? You need to reference it in order to use System.Linq.

Answer 5

Check if your project references on System.Xml.Linq library too

Answer 6

Not sure LINQ is fully implemented within the current release http://www.mono-project.com/Roadmap