Question

我是C＃和实体框架的新手，有以下问题。

我有一个玩家和一个团队模型：

public class Player
{
    public int ID { get; set; }

    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int TeamID { get; set; }
}

public class Team
{
    public int ID { get; set; }

    public string Name { get; set; }

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

现在我通过rest web api将数据暴露给客户端。但是当我试图获得所有玩家时，会返回一个json数组，其中玩家可以使用＃j; team是团队表的ID（外键）。但是，返回团队名称会很不错。我怎样才能优雅地实现这一目标？

{
ID: 7
FirstName: "Sidney"
LastName: "Crosby"
TeamID: 1
}

但我想要

{
ID: 7
FirstName: "Sidney"
LastName: "Crosby"
TeamID: Denver Broncos
}

Web Api控制器如下所示：

    public async Task<IHttpActionResult> GetPlayer(int id)
    {
        Player player = await db.Players.FindAsync(id);
        if (player == null)
        {
            return NotFound();
        }
        return Ok(player);
    }

Answer 1

首先更改您的玩家类以引用父团队而不仅仅是ID：

    public class Player
    {
        public int ID { get; set; }

        public string FirstName { get; set; }
        public string LastName { get; set; }
        public virtual Team Team { get; set; }
    }

然后创建一个DTO对象，以在您希望它们的结构中公开所需的属性：

    public class PlayerDto
    {
        public PlayerDto(Player player)
        {
            FirstName = player.FirstName;
            LastName = player.LastName;
            TeamName = player.Team.Name;
        }

        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string TeamName { get; set; }
    }

Web Api暴露特定的attribut而不是外键

1 个答案: