EF核心代码首先配置关系[关闭]答案

【问题标题】：EF core code first configuring relationships [closed]EF核心代码首先配置关系[关闭]
【发布时间】：2018-04-18 10:01:18
【问题描述】：

我正在尝试设置比赛。

我有以下型号：

public class Player
{
    [Required]
    public Guid PlayerId { get; set; }

    [Required]
    public string Firstname { get; set; }

    [Required]
    public string Lastname { get; set; }
}

public class Team
{
    [Required]
    public Guid TeamId { get; set; }

    [Required]
    public string TeamName { get; set; }

    [Required]
    [MaxLength(2)]
    [ForeignKey("TeamPlayerFK")]
    public List<Player> PlayersList { get; set; }
}

public class Match
{
    [Required]
    public Guid MatchId { get; set; }

    [ForeignKey("MatchTeamFK")]
    public Team Team { get; set; }

    [ForeignKey("MatchPlayerFK")]
    public Player Player { get; set; }

    [Required]
    public DateTime MatchDateTime { get; set; }

    public int? Points { get; set; }
}

进行此设置后，玩家只能加入一个团队。它应该能够加入多个团队。有人可以帮助我朝着正确的方向前进吗？

【问题讨论】：

玩家应该有属性 TeamId。最好在纸上画出表格之间的关系，然后思考
复制：stackoverflow.com/q/46184678/861716
终于找到了，谢谢@GertArnold

标签： entity-framework ef-code-first

【解决方案1】：

这是我在@GertArnold 的帮助下找到的答案：

public class Player
{
    [Required]
    public Guid PlayerId { get; set; }

    [Required]
    public string Firstname { get; set; }

    [Required]
    public string Lastname { get; set; }

    public virtual ICollection<TeamPlayer> TeamPlayers { get; set; }

    public virtual ICollection<Match> Matches { get; set; }
}
public class Team
{
    [Required]
    public Guid TeamId { get; set; }

    [Required]
    public string TeamName { get; set; }

    [Required]
    public virtual ICollection<TeamPlayer> TeamPlayers { get; set; }
}
public class TeamPlayer
{
    public Guid TeamPlayerId { get; set; }

    public Guid TeamId { get; set; }
    public Team Team { get; set; }

    public Guid PlayerId { get; set; }
    public Player Player { get; set; }
}
public class Match
{
    [Required]
    public Guid MatchId { get; set; }

    public Guid TeamId { get; set; }
    public Team Team { get; set; }

    public Guid PlayerId { get; set; }
    public Player Player { get; set; }

    [Required]
    public DateTime MatchDateTime { get; set; }

    public int? Points { get; set; }
}

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<TeamPlayer>()
            .HasOne(tp => tp.Team)
            .WithMany(t => t.TeamPlayers)
            .HasForeignKey(tp => tp.TeamId);

        modelBuilder.Entity<TeamPlayer>()
            .HasOne(tp => tp.Player)
            .WithMany(p => p.TeamPlayers)
            .HasForeignKey(tp => tp.PlayerId);

        base.OnModelCreating(modelBuilder);
    }

【讨论】：