Question

我正在尝试使用Linq To Sql并在尝试在我的Web应用程序中执行以下查询时遇到问题：

var query = from t in teamsTable
            where t.SeasonTeams.All(x => x.SeasonID != 4)
            select t;

return query.ToList();

此时，我收到以下错误：

会员访问'Int32 SeasonID' 'DomainModel.Entities.SeasonTeam'没有合法的类型 “System.Collections.Generic.IList`1 [DomainModel.Entities.SeasonTeam]。

使用LINQPad，完全相同的查询工作。我在下面列出了Linq Mappings的类。我非常感谢帮助解决问题并解释导致问题的原因。

[Table(Name = "Teams")]
public class Team
{
    [Column(IsPrimaryKey = true, IsDbGenerated = true, AutoSync = AutoSync.OnInsert)]
    public int TeamID { get; set; }

    [Column]
    public string Name { get; set; }

    [Association(OtherKey = "TeamID")]
    private EntitySet<Player> _players = new EntitySet<Player>();
    public IList<Player> TeamPlayers { get { return _players.ToList(); } }


    [Association(OtherKey = "HomeTeamID")]
    private EntitySet<Fixture> _homeFixtures = new EntitySet<Fixture>();
    public IList<Fixture> HomeFixtures { get { return _homeFixtures.ToList(); } }

    [Association(OtherKey = "AwayTeamID")]
    private EntitySet<Fixture> _awayFixtures = new EntitySet<Fixture>();
    public IList<Fixture> AwayFixtures { get { return _awayFixtures.ToList(); } }

    [Association(OtherKey="TeamID")]
    private EntitySet<SeasonTeam> _seasonteams = new EntitySet<SeasonTeam>();
    public IList<SeasonTeam> SeasonTeams { get { return _seasonteams.ToList(); } }

}

[Table(Name = "Seasons")]
public class Season
{
    [Column(IsPrimaryKey = true, IsDbGenerated = true, AutoSync = AutoSync.OnInsert)]
    public int SeasonID { get; set; }

    [Column]
    public DateTime StartDate { get; set; }

    [Column]
    public DateTime EndDate { get; set; }

    [Column]
    public int LeagueID { get; set; }

    [System.Data.Linq.Mapping.Association(OtherKey = "SeasonID")]
    private EntitySet<Fixture> _fixtures = new EntitySet<Fixture>();
    public IList<Fixture> Fixtures { get { return _fixtures.ToList().AsReadOnly(); } }

    [System.Data.Linq.Mapping.Association(OtherKey = "SeasonID")]
    private EntitySet<SeasonTeam> _seasonteams = new EntitySet<SeasonTeam>();
    public IList<SeasonTeam> SeasonTeams { get { return _seasonteams.ToList().AsReadOnly(); } }

    internal EntityRef<League> _league;
    [System.Data.Linq.Mapping.Association(ThisKey = "LeagueID", Storage = "_league")]
    public League League
    {
        get { return _league.Entity; }
        internal set { _league.Entity = value; LeagueID = value.LeagueID; }
    }
}


[Table(Name="SeasonTeams")]
public class SeasonTeam
{
    [Column(IsDbGenerated = true, IsPrimaryKey = true, AutoSync = AutoSync.OnInsert)]
    public int SeasonTeamID { get; set; }

    [Column]
    public int TeamID { get; set; }

    [Column]
    public int SeasonID { get; set; }

    internal EntityRef<Team> _team;
    [Association(ThisKey = "TeamID", Storage = "_team")]
    public Team Team
    {
        get { return _team.Entity; }
        set { _team.Entity = value; TeamID = value.TeamID; }
    }

    internal EntityRef<Season> _season;
    [Association(ThisKey = "SeasonID", Storage = "_season")]
    public Season Season
    {
        get { return _season.Entity; }
        set { _season.Entity = value; SeasonID = value.SeasonID; }
    }
}

Linq to SQL错误 - 成员访问不合法。是什么造成的？

0 个答案: