我相信在使用代码优先时，您始终总是需要至少一侧的导航属性。然后您将能够映射它：
public class User { public string UserId { get; set; } public string PasswordHash { get; set; } public bool IsDisabled { get; set; } public DateTime AccessExpiryDate { get; set; } public bool MustChangePassword { get; set; } public int RoleId { get; set; } public Role Role { get; set; }}public class Role { public int RoleId { get; set; } public string Name { get; set; } public string Description { get; set; } }public class Right { public Guid RightId { get; set; } public string Name { get; set; } public string Description { get; set; } public int RoleId { get; set; } public Role Role { get; set; }}public class TestContext : DbContext{ public TestContext() : base("Entities") {} protected override void onModelCreating(System.Data.Entity.ModelConfiguration.ModelBuilder modelBuilder) { base.onModelCreating(modelBuilder); modelBuilder.Entity<User>() .HasRequired(r => r.Role) .WithMany() .HasForeignKey(r => r.RoleId); modelBuilder.Entity<Right>() .HasRequired(r => r.Role) .WithMany() .HasForeignKey(r => r.RoleId); }}
