Bug 12082 - Editor does not recognize Linq methods but project can be build and run
Summary: Editor does not recognize Linq methods but project can be build and run
Alias: None
Product: Xamarin Studio
Classification: Desktop
Component: C# Binding ()
Version: 4.0.4
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: 4.0.9 (from master)
Assignee: Mike Krüger
Depends on:
Reported: 2013-05-02 18:55 UTC by David Koontz
Modified: 2013-06-24 16:18 UTC (History)
1 user (show)

Is this bug a regression?: ---
Last known good build:

Example solution that produces the issue (7.88 KB, application/zip)
2013-05-02 18:55 UTC, David Koontz

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Description David Koontz 2013-05-02 18:55:04 UTC
Created attachment 3910 [details]
Example solution that produces the issue

I created a brand new console C# project.  I added the following code as the test case (also attached as a solution).

using System;
using System.Linq;

namespace LinqProblemTest {
	class MainClass {
		public static void Main(string[] args) {
			var nums = new [] { 1, 2, 3, 4, 5, 6, 7, 8 };
			nums.Select(n => n * 2).ToList().ForEach(Console.WriteLine);

The using System.Linq line is in red with the message "Unknown resolve error".  Also the nums.Select(n => n * 2).ToList().ForEach(Console.WriteLine) line has the message "error CS0117: `System.Int32[]' does not contain a definition for `Select'"

If I build and run, this project runs just fine, only the editor is unable to resolve Linq (or maybe is having a hard time with extension methods?).
Comment 1 Mikayla Hutchinson [MSFT] 2013-05-02 19:09:49 UTC
You probably need a reference to System.Core.
Comment 2 David Koontz 2013-05-02 22:26:17 UTC
Right you are.
Comment 3 PJ 2013-06-24 16:18:53 UTC
This bug was marked as fixed for Xamarin Studio 4.0.9, which is currently in the beta channel. Try it out!