通用列表在.net核心中不包含AsQueryable（）

Question

I'm writing my class library and after commit changes to git, application stop working - build ends with really strange error:

'IList' does not contain a definition for 'AsQueryable' and no extension method 'AsQueryable' accepting a first argument of type 'IList' could be found (are you missing a using directive or an assembly reference?)

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

using Idea7.Entity;
using Idea7.Query;

namespace Idea7.Repository
{
    /// <summary>
    /// Abstract in-memory repository
    /// </summary>
    public abstract class InMemoryRepository<TEntity, TKey> : IRepository<TEntity, TKey>
        where TEntity : class, IEntity<TKey>
    {
        public abstract IList<TEntity> Data { get; }

        public long Count(IQueryObject<TEntity> query)
        {
            return query.Count(Data.AsQueryable());
        }

        public IEnumerable<TEntity> Fetch(IQueryObject<TEntity> query)
        {
            return query.Fetch(Data.AsQueryable());
        }

        public TEntity FetchOne(IQueryObject<TEntity> query)
        {
            return query.FetchOne(Data.AsQueryable());
        }

        public TEntity Find(TKey id)
        {
            return Data.SingleOrDefault(s => s.Id.Equals(id));
        }

        public void Create(TEntity entity)
        {
            Data.Add(entity);
        }

        public void Update(TEntity entity)
        {
            Delete(entity);
            Create(entity);
        }

        public void Delete(TEntity entity)
        {
            Data.Remove(entity);
        }
    }
}

What am I missing?

Here is project.json

{
  "version": "1.0.0-*",
  "description": "Idea7.Repository Class Library",
  "authors": [ "Sebastian Bušek" ],
  "tags": [ "" ],
  "projectUrl": "",
  "licenseUrl": "",

  "frameworks": {
    "dnx451": { },
    "dnx50": { },
    "netcore50": { }
  },

  "dependencies": {
    "Idea7.Entity": "1.0.0-*",
    "Idea7.Query": "1.0.0-*",
    "Idea7.UnitOfWork": "1.0.0-*",
    "Microsoft.CSharp": "4.0.1-beta-23516"
  }
}

Answer 1

您是否在project.json引用中添加了此代码？

"System.Linq.Queryable": "4.0.1-beta-23516"

Answer 2

AsQuerable是System.Linq程序集/命名空间的一部分。