在linq查询中添加最大值和平均值

如何解决在linq查询中添加最大值和平均值

我在下面有一个SQL查询：

[num_elements,2]

输出：

SELECT MAX(r.Suburb),AVG(s.Longitude) AS Longitude,AVG(s.Latitude) AS Latitude 
From CafeAddress r inner join Cafe s on s.CafeId = r.CafeId
WHERE r.Region = 'Sydney'

查询应获取该地区的所有郊区，例如悉尼是该地区，郊区将包括Bankstown等。

如何在下面的linq查询中添加最大值和平均值？ （区域ID是用户输入（字符串））

Bankstown   174.759541622222    -36.8552809611111

我只能通过分组方式来做到这一点，但我正努力避免这种情况。

解决方法

我认为这将会越来越接近：

var query =
    from cafeAddress in _context.CafeAddress
    join cafe in _context.Cafe on cafeAddress.CafeId equals cafe.CafeId
    where cafeAddress.StateProvinceRegion == regionId
    orderby cafeAddress.Suburb descending
    group new
    {
        cafeAddress.Suburb,cafe.Latitude,cafe.Longitude
    } by cafeAddress.StateProvinceRegion into g
    select new
    {
        StateProvinceRegion = g.First().Suburb,Latitude = g.Average(x => x.Latitude),Longitude = g.Average(x => x.Longitude),};

或者这个轻微的变体：

var query =
    from cafeAddress in _context.CafeAddress
    join cafe in _context.Cafe on cafeAddress.CafeId equals cafe.CafeId
    where cafeAddress.StateProvinceRegion == regionId
    orderby cafeAddress.Suburb descending
    group new
    {
        cafeAddress.Suburb,cafe.Longitude
    } by cafeAddress.StateProvinceRegion into gs
    from g in gs.Take(1)
    select new
    {
        StateProvinceRegion = g.Suburb,Latitude = gs.Average(x => x.Latitude),Longitude = gs.Average(x => x.Longitude),};