Question

我有以下代码：

public class Show
{
    public int Id { get; set; }
    public decimal Revenue { get; set; }
    public Movie Movie { get; set; }
    public Theater Theater { get; set; }
    public City City { get; set; }
    public DateTime ShownAt { get; set; }
}

public class Movie
{
    public int Id { get; set; }
    public string Name { get; set; }
}

public class Theater
{
    public int Id { get; set; }
    public string Name { get; set; }
}

public class City
{
    public int Id { get; set; }
    public string Name { get; set; }
}

我们假设我将使用以下代码获得以下输出：

IEnumerable<Show> shows = GetShows();
var result = shows.Select(x => new { Movie = x.Movie.Name, Theater = x.Theater.Name, City = x.City.Name, x.ShownAt.ToString(), x.Revenue });

结果

Movie, Theater, City, ShownAt, Revenue
------------------------------------------------------
Movie1, Theater1, Boston, 2011-11-01 11:00:00.000, 100
Movie2, Theater1, Boston, 2011-11-01 12:00:00.000, 125
Movie1, Theater1, Boston, 2011-11-02 11:00:00.000, 110
Movie2, Theater2, New York, 2011-11-02 12:00:00.000, 125

到目前为止一切顺利。

我正在寻找的输出我可以使用以下代码获得：

var showResult = shows.GroupBy(x => new { Movie = x.Movie.Name, Theater = x.Theater.Name, City = x.City.Name }).Select(x => new { x.Key.Movie, x.Key.Theater, x.Key.City, Revenue = x.Sum(y => y.Revenue) });

结果

Movie, Theater, City, Revenue
-----------------------------------------------
Movie1, Theater1, Boston, 210
Movie2, Theater1, Boston, 125
Movie2, Theater2, New York, 125

但我还想包括第五个名为revenueKey的专栏。我会通过将Theater和City的第一个结果组分组并将其除以行数来获得此值。

所以，波士顿剧院1的收入关键是（100 + 125 + 110）/ 3 = 111.66，纽约剧院2的收入关键是（125）/ 1 = 125.在代码中它看起来像： / p>

var revenueKeys = shows.GroupBy(x => new { Theater = x.Theater.Name, City = x.City.Name }).Select(x => new { x.Key.Theater, x.Key.City, Revenue = x.Sum(y => y.Revenue), RevenueKey = x.Sum(y => y.Revenue) / x.Count() });

我有没有办法结合showResult和revenueKey LINQ查询来获得以下结果？

Movie, Theater, City, Revenue, RevenueKey
-----------------------------------------------
Movie1, Theater1, Boston, 210, 111.66
Movie2, Theater1, Boston, 125, 111.66
Movie2, Theater2, New York, 125, 125

将两个LINQ Group By查询组合到一个结果集中

0 个答案: