ASP.NET vNext class library, linq not available?

Question

I'm using a linq expression in a asp.net vNext class library. No errors are displayed in the editor, but when I attempt to build I see the following message: `Could not find an implementation of the query pattern for source type 'IEnumerable<T>'. 'Select' not found. Are you missing a reference to 'System.Core.dll' or a using directive for 'System.Linq'? FitLog.Domain.ASP.NET Core 5.0` I do have the using statement for System.Linq, so I'm not sure what's going on. Update Here's my project.json: ``` { "version": "1.0.0-*", "dependencies": { }, "frameworks" : { "aspnet50" : { "dependencies": { } }, "aspnetcore50" : { "dependencies": { "System.Runtime": "4.0.20-*" } } } } ```

Accepted Answer

For the `aspnetcore50` target you need to add a dependency for `System.Linq` (you'll see it pop up in the Intellisense in the `project.json` file).

ASP.NET vNext class library, linq not available?

Solution

Problem