Question

我具有以下架构：

标准ASP.NET身份表，用户只能拥有一个角色
有2个角色：驱动程序和管理器
用户具有驱动程序或管理员角色。每个驱动程序在驱动程序表中都有记录，每个管理人员在Manager表中都有记录。
管理器和驱动程序表均具有名字和姓氏

我的实体并在其中映射（0..1：1）：

public class AspNetUser 
{
    //.....
    public virtual Manager Manager { get; set; }
    public virtual Driver Driver { get; set; } 
}


public partial class Driver
{
    public int Id { get; set; }
    //....
    public virtual AspNetUser AspNetUser { get; set; }

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

public class Manager
{
    public int Id { get; set; }
    //....
    public virtual AspNetUser AspNetUser { get; set; }

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

    public class AspNetUserMap : EntityTypeConfiguration<AspNetUser>
    {
        public AspNetUserMap()
        {
            this.HasKey(dp => dp.Id);
            this.Property(p => p.UserName).IsRequired().HasMaxLength(256);
            this.HasIndex(p => p.UserName).IsClustered(false).IsUnique();

            this.HasOptional(c => c.Driver)
                .WithOptionalPrincipal(a => a.AspNetUser)
                .Map(m => m.MapKey("AspNetUserId"));

            this.HasOptional(c => c.Manager)
                .WithOptionalPrincipal(a => a.AspNetUser)
                .Map(m => m.MapKey("AspNetUserId"));

现在，我需要从AspNetUser获取所有用户，但要使用他们的FN / LN。要获取FN / LN，我应该检查用户角色，然后致电驱动程序或管理器。

我有以下代码：

        List<ChatUserDomain> returnedUsers = new List<ChatUserDomain>();
        var users = (from i in db.AspNetUsers
                     .Include(path => path.Driver)
                     .Include(path => path.Manager)
                     .Include(path => path.AspNetRoles)
                     where i.CompanyId == db.AspNetUsers.Where(p => p.UserName.Equals(username, StringComparison.CurrentCultureIgnoreCase)).FirstOrDefault().CompanyId 
                     select new
                     {
                         AspNetUser = i,
                         Username = i.UserName,
                         ....
                     }
                     ).ToList();
        foreach (var user in users)
        {
            returnedUsers.Add(new ChatUserDomain()
            {
                UserId = user.AspNetUser.Id,
                Name = GetNameByUser(user.AspNetUser),
                ...
            });
        }
        return returnedUsers;

和GetNameByUser方法：

    private string GetNameByUser(AspNetUser aspNetUser)
    {
        IProfile profile = GetProfileByUser(aspNetUser);

        if (!String.IsNullOrWhiteSpace(profile.FirstName) && !String.IsNullOrEmpty(profile.LastName))
        {
            return (GetFirstLettersOfFullName(profile.FirstName, profile.LastName));
        }
        else
        {
            return (aspNetUser.UserName.Substring(0, 2));
        }
    }

    private IProfile GetProfileByUser(AspNetUser aspNetUser)
    {
        IProfile profile = null;
        var role = aspNetUser.AspNetRoles.FirstOrDefault().Name;
        if (role.Equals(Domain.StaticStrings.RoleStaticStrings.ROLE_DRIVER))
            profile = aspNetUser.Driver;
        else
            profile = aspNetUser.Manager;

        return profile;
    }

它可以工作，但是会创建其他user.Count对DB的调用。如何对EF说“父请求中的负载管理器和驱动器数据”？

EF如何提出一项要求

0 个答案: