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比较linq表达式中的列表

[英]comparing a list within linq expression

I have the following query: 我有以下查询:

var zoneIds = filter.Zones.Select(s => s.ZoneId);

var playerQuery = this._cmsDbContext.PlayersLoader.Query(user.ClientId);

var sortedLocationIds = playerQuery
  .Where(w => zoneIds.Contains(w.ZoneId))
  .GroupBy(g => g.LocationId)
  .Select(s => s.Key);

The problem I'm having is as following: If the list with zoneIds contains more then 1 zoneId , i only want to return the locations which has all of the zoneid's in the list. 我遇到的问题如下:如果具有zoneIds的列表包含的内容超过1个zoneId ,我只想返回列表中具有所有zoneid的位置。 As of now i return every location that I find any hit on within the zoneId list. 到目前为止,我返回在zoneId列表中找到任何命中位置的每个位置。

So if zoneIds contains lets say zoneId = 1 and zoneId = 5 , i only want the locations which has players with zoneId 1 and 5 . 因此,如果zoneIds包含让我们说zoneId = 1zoneId = 5 ,那么我只想要具有zoneId 15的玩家的位置。 Now i get every location that has either zone 1 or 5 . 现在,我得到的每个区域都有1区或5区。

Any help would be highly appreciated! 任何帮助将不胜感激!

*edit, *编辑,

here are the classes im working with: 这是我正在使用的类:

public class Location : IEntityBase
    {
        public Location()
        {
            Players = new List<Player>();
            Filters = new List<Filter>();
        }

        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int LocationId { get; set; }

        public int? ProfileId { get; set; }
        [ForeignKey("ProfileId")]
        public virtual Profile Profile { get; set; }

        public int StoreNumber { get; set; }

        [StringLength(50)]
        public string LocationName { get; set; }

        [StringLength(50)]
        public string Street { get; set; }

        [StringLength(10)]
        public string ZipCode { get; set; }

        [StringLength(50)]
        public string City { get; set; }

        [StringLength(50)]
        public string Country { get; set; }

        [StringLength(20)]
        public string Phone { get; set; }

        [StringLength(50)]
        public string Email { get; set; }

        [StringLength(50)]
        public string Homepage { get; set; }

        public int LocationActive { get; set; }

        public int? ClusterId { get; set; }
        [ForeignKey("ClusterId")]
        public virtual Cluster Cluster { get; set; }

        public int? RegionId { get; set; }
        [ForeignKey("RegionId")]
        public virtual Region Region { get; set; }

        public virtual ICollection<Player> Players { get; set; }

        public virtual ICollection<Filter> Filters { get; set; }

        public int ClientId { get; set; }
        [ForeignKey("ClientId")]
        public virtual Client Client { get; set; }
    }

     public class Player : IEntityBase
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int PlayerId { get; set; }

        public int LocationId { get; set; }
        [ForeignKey("LocationId")]
        public virtual Location Location { get; set; }

        public int ProfileId { get; set; }
        [ForeignKey("ProfileId")]
        public virtual Profile Profile { get; set; }

        [StringLength(50)]
        public string PlayerName { get; set; }

        public int ZoneId { get; set; }
        [ForeignKey("ZoneId")]
        public virtual Zone Zone { get; set; }

        public int NrOfScreens { get; set; }

        public DateTime ModifiedDate { get; set; }

        public DateTime CreatedDate { get; set; }

        public int PlayerActive { get; set; }

        public int ClientId { get; set; }
        [ForeignKey("ClientId")]
        public virtual Client Client { get; set; }

        public DateTime LastContactDate { get; set; }

        [Range(0, 3)]
        public int ComputerStatus { get; set; }

        [Range(0, 3)]
        public int ScreenStatus { get; set; }

        [Range(0, 3)]
        public int ExtStatus { get; set; }

        public DateTime LastServiceDate { get; set; }
    }

You can use !zoneIds.Except(locationGroupZoneIDs).Any : 您可以使用!zoneIds.Except(locationGroupZoneIDs).Any

var sortedLocationIds = playerQuery
    .GroupBy(w => w.LocationId)
    .Where(g => !zoneIds.Except(g.Select(w => w.ZoneId)).Any())
    .Select(g => g.Key);

Another approach, probably more readable but a little bit less efficient: 另一种方法,可能更具可读性,但效率较低:

var sortedLocationIds = playerQuery
    .GroupBy(w => w.LocationId)
    .Where(g => zoneIds.All(id => g.Select(w => w.ZoneId).Contains(id)))
    .Select(g => g.Key);

What you need is 您需要的是

var zoneIds = filter.Zones.Select(s => s.ZoneId);

var playerQuery = this._cmsDbContext.PlayersLoader.Query(user.ClientId);

var sortedLocationIds = playerQuery
    .SelectMany(w => w.Players.Where(p=>p.ZoneId == w.ZoneId))
    .Select(s=>s.LocationId)
    .Distinct();

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