Question

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);

我遇到的问题如下：如果带有zoneIds的列表包含多于1 zoneId，我只想返回列表中包含所有zoneid的位置。截至目前，我返回我在zoneId列表中找到任何匹配的每个位置。

因此，如果zoneIds包含允许说zoneId = 1和zoneId = 5，我只想要拥有zoneId 1 和 5 。现在，每个位置都有 1 或 5 区域。

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*编辑

以下是我正在使用的课程：

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; }
    }

Answer 1

You can use !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:

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

Answer 2

What you need is

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();

比较linq表达式中的列表

2 个答案: