C# 查询用户&；通过Linq的角色（ASP.NET标识）

我想从数据库里找到病人和医生。我正在使用ASP.NET标识

相关表格包括

AspNetUsers

、

AspNetRoles

和

AspNetUserRoles

这是我的问题：

var result = from pateints in context.Users
             let pEmail = pateints.Email
             from doctors in context.Users
             from roles in context.Roles
             where pateints.Roles.Any(r => r.RoleId == roles.Id && roles.Name == "Patient")
             where doctors.Roles.Any(r => r.RoleId == roles.Id && roles.Name == "Doctor") 
             select new { doctors.Email, pEmail };

---

我尽了最大努力找到问题，但此查询没有返回任何结果。

您只需加入所有三个实体，然后对角色名称应用筛选器，如下所示-

var result = from u in context.Users
             join ur context.UserRoles on u.Userid equal ur.Userid
             join r in context.Roles on r.Roleid equal ur.Roleid
             where r.Name == "Doctor" || r.Name == "Patient"
             select new {UserName = u.UserName, Email = u.Email, Role = r.Name };

UserName        Email           Role
abc xyz         abc@abc.com     Doctor
doc xyz         doc@abc.com     Doctor
pqr xyz         pqr@abc.com     Patient
lmn xyz         lmn@abc.com     Patient

示例输出如下所示-

var result = from u in context.Users
             join ur context.UserRoles on u.Userid equal ur.Userid
             join r in context.Roles on r.Roleid equal ur.Roleid
             where r.Name == "Doctor" || r.Name == "Patient"
             select new {UserName = u.UserName, Email = u.Email, Role = r.Name };

UserName        Email           Role
abc xyz         abc@abc.com     Doctor
doc xyz         doc@abc.com     Doctor
pqr xyz         pqr@abc.com     Patient
lmn xyz         lmn@abc.com     Patient

试试这个

    using(ApplicationDbContext db=new ApplicationDbContext())
    {
          var users = (from user in db.Users
                       from roles in user.Roles
                       join role in db.Roles
                       on roles.RoleId equals role.Id 
                       select new
                       {
                           user.UserName, 
                           role.Name
                       }).ToList(); 
    }

---

尝试使用Lambda而不是Linq表达式。Lambda易于阅读和调试。我真的很讨厌Linq表达式。请包括您的表。这些表是由Identity@llazarThank定义的，但我以前没有使用Lambda@IgorQuirino

pateints

在

上下文中。用户
或在
上下文中。角色
？