在实体框架中使用分组依据获取行数

Question

我在该实体中有TheaterMovieShowTime实体，我想通过对特定列（例如TheaterMovieDetailID）进行分组来获取行数。

这是我的实体：

public class TheaterMovieShowTime
{
   public int TheaterMovieShowTimeID { get; set; }
   public int TheaterMovieDetailID { get; set; }
    public int TheaterShowTimeID { get; set; }

    public virtual TheaterMovieDetail TheaterMovieDetails { get; set; }
    public virtual TheaterShowTime TheaterShowTime { get; set; }
}

这是我的TheatreMovieDetail实体：

public class TheaterMovieDetail
{
    public int TheaterMovieDetailID { get; set; }
    public int TheaterID { get; set; }
    public int MovieID { get; set; }
    public DateTime DateFrom { get; set; }
    public DateTime DateTo { get; set; }

    public virtual Movie Movie { get; set; }
    public virtual Theater Theater { get; set; }

    public virtual ICollection<TheaterMovieShowTime> TheaterMovieShowTimes { get; set; }
}

我尝试这样：

 var p = _theaterMovieShowTimeService.GetAllTheaterMovieShowTime()
            .GroupBy(x => x.TheaterMovieDetailID)
            .Select(x => new TheaterMovieShowTimeSummaryViewModel
            {
                TheaterName = x.FirstOrDefault().TheaterMovieDetails.Theater.TheaterName,
                MovieName = x.FirstOrDefault().TheaterMovieDetails.Movie.MovieName,
                NoOfShows=???????? // get the no of rows here
            });

如何在此处获取NoOfShows，该行不是TheaterMovieDetailID分组的行。

将不胜感激提供的任何帮助。 让我知道您是否需要其他信息来帮助回答这个问题

Answer 1

使用linq Count()函数：

var p = _theaterMovieShowTimeService.GetAllTheaterMovieShowTime()
    .GroupBy(x => x.TheaterMovieDetailID)
    .Select(x => new TheaterMovieShowTimeSummaryViewModel
    {
        TheaterName = x.FirstOrDefault().TheaterMovieDetails.Theater.TheaterName,
        MovieName = x.FirstOrDefault().TheaterMovieDetails.Movie.MovieName,
        NoOfShows= x.Count()  // get the no of rows here
    });