Question

我有3个表需要在一个表中组合。在下面你可以看到代码。

问题是每个球员都可以参加每场比赛的一个或多个球队。每场新赛事的球员和球队都会安排好。

那么我怎样才能用流畅的api映射它，或者有更好的方法来解决它。谢谢你们。

 public class Player
    {
        public int PlayerID { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Phone { get; set; }
        public DateTime TimeStamp { get; set; }
        public ICollection<Team> Teams { get; set; }
        public ICollection<Tournament> Tournaments { get; set; }

    }

public class Team
    {
        public int TeamID { get; set; }
        public string Name { get; set; }
        public DateTime TimeStamp { get; set; }
        public ICollection<Player> Players { get; set; }
        public ICollection<Tournament> Tournaments { get; set; }
    }

public class Tournament
    {
        public int TournamentID { get; set; }
        public DateTime Date { get; set; }
        public int PlaceID { get; set; }
        public DateTime TimeStamp { get; set; }
        public virtual Place Place { get; set; }
        public ICollection<Player> Players { get; set; }
        public ICollection<Team> Teams { get; set; }
    }



  public class BPContext : DbContext
    {
        public DbSet<Tournament> Tournaments { get; set; }
        public DbSet<Place> Places { get; set; }
        public DbSet<Table> Tables { get; set; }
        public DbSet<Player> Players { get; set; }
        public DbSet<Team> Teams { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();

        }
    }

Answer 1

我不知道你想用这个来完成什么。你有的桌子包含所有球员，所有球队和所有锦标赛。

我想会有一场比赛要打？你可以做的是创建另一个表匹配，使用类似这样的实体：

public class Match
{

 [Key]
 public int MatchId {get;set;}

 [ForeignKey("Tournament")]
 public int TournamentId {get;set;}

 [InverseProperty("Matches")]
 public virtual List<Team> Teams {get;set;}

 [InverseProperty("Matches")]
 public virtual List<Player> Players {get;set;}

 [InverseProperty("Matches")]
 public virtual Tournament Tournament {get;set;}
}

这个新实体拥有所有3个先前的实体。但是，您必须修改以前的更改才能包含这些更改：

public class Player
{
    public int PlayerID { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Phone { get; set; }
    public DateTime TimeStamp { get; set; }

    [InverseProperty("Players")]
    public virtual List<Match> Matches { get; set; }

    [InverseProperty("Players")]
    public virtual List<Team> Teams {get;set;}
}

可以使用LINQ：ctx.Players.Where（x =＆gt; x.PlayerId == 15）.Matches.Select（x =＆gt; x.TournamentId）来完成玩家的所有锦标赛。

如果您想查看锦标赛中的所有玩家：ctx.Matches.Where（x =＆gt; x.TournamentId == 15）.Players.Select（x =＆gt; x.Name）。

public class Team
{
    public int TeamID { get; set; }
    public string Name { get; set; }
    public DateTime TimeStamp { get; set; }

    [InverseProperty("Teams")]
    public List<Match> Matches {get;set;}

    [InverseProperty("Teams")]
    public List<Player> Players {get;set;}
}

public class Tournament
{
    public int TournamentID { get; set; }
    public DateTime Date { get; set; }
    public int PlaceID { get; set; }
    public DateTime TimeStamp { get; set; }
    public virtual Place Place { get; set; }

    [InverseProperty("Tournament")]
    public virtual List<Match> Matches {get;set;}
}

3个表上的EF多对多关系（Fluent API）

1 个答案: