从EntitySetController Get返回有序集合

Question

我试图在我的EntitySetController中从我的Get方法返回它之前订购一个集合，这是我的代码：

[Queryable]
    public IQueryable<Standing> GetStandings()
    {
        //order by points, goalsfor-goalsagainst, goalsfor, teamname
        IQueryable<Standing> standings = db.Standings.Include("Team").Include("Stage");

        var standingsQuery = from s in standings
            let points = (s.Won*3) + (s.Drawn*1)
            select standings.OrderByDescending(p => points)
                .ThenByDescending(g => g.GoalsFor - g.GoalsAgainst)
                .ThenBy(t => t.Team.TeamName);

        return standingsQuery.AsQueryable();

    }

但我收到错误：

Cannot implicitly convert type 'System.Linq.IQueryable<System.Linq.IOrderedQueryable<Standing>>' to 'System.Linq.IQueryable<Standing>'. An explicit conversion exists (are you missing a cast?)

我是否需要单独的方法来返回有序集合？

Answer 1

试试这样：

[Queryable]
public IQueryable<Standing> GetStandings()
{
    //order by points, goalsfor-goalsagainst, goalsfor, teamname

    IQueryable<Standing> standings = db.Standings.Include("Team").Include("Stage");

    IOrderedQueryable<Standing> standingsQuery = standings
        .OrderBy(s => s.Won * 3 + s.Drawn * 1)
        .ThenByDescending(s => s.GoalsFor - s.GoalsAgainst)
        .ThenBy(s => s.Team.TeamName);

    return standingsQuery.AsQueryable();
}

您的代码无效的原因是您返回IQueryable<IOrderedQueryable<Standing>>而不是IOrderedQueryable<Standing>。