MVC5 引用 ApplicationDbContext ： IdentityDbContext<ApplicationUser>

Question

我正在编写一个带有 EF 应用程序的 MVC4，现在正在将它升级到带有 EF 的 MVC5。在 MVC4 中，我遵循了一个创建 DBContext 的教程，如下所示（IssueContext.cs）。我知道在带有 Identity 的 MVC5 中，我们的 DBContext 必须从 IdentityDbContext 派生。在我的 Seed 方法中引用 IdentityDbContext 时遇到问题。

using System;
using System.Data.Entity;
using System.Data.Entity.Migrations;
using System.Linq;
using RecreationalServicesTicketingSystem.Models;
using System.Collections.Generic;

internal sealed class Configuration : DbMigrationsConfiguration<RecreationalServicesTicketingSystem.DAL.IssueContext> <-- References the old one
{
    public Configuration()
    {
        AutomaticMigrationsEnabled = false;
    }

    protected override void Seed(RecreationalServicesTicketingSystem.DAL.IssueContext context)<--References the old one
    {



 //Errors on users (new users { FirstMidName.....})
        var users = new List<ApplicationUser>
    {
        new users { FirstMidName = "Jason",   LastName = "Wan",
            EnrollmentDate = DateTime.Parse("2016-02-18"), DepartmentID = 1, DepotID = 1,IsAdministrator = true},
        new users { FirstMidName = "Andy", LastName = "Domagas",
            EnrollmentDate = DateTime.Parse("2016-02-18"), DepartmentID = 1,DepotID = 1,IsAdministrator = true},
        new users { FirstMidName = "Denis",   LastName = "Djohar",
            EnrollmentDate = DateTime.Parse("2016-02-18"), DepartmentID = 1 ,DepotID = 1,IsAdministrator = true },
        new users { FirstMidName = "Christine",   LastName = "West",
            EnrollmentDate = DateTime.Parse("2016-02-18"), DepartmentID = 2, DepotID = 3,IsAdministrator = false},

    };

 //Errors on UserID (... = users.Single(s => s.LastName == "Wan").UserID <--HERE)
        var tickets = new List<Ticket>
        {
            new Ticket {
                UserID = users.Single(s => s.LastName == "Wan").UserID,
                CategoryID = categories.Single(c => c.CategoryName == "Con-X" ).CategoryID,
                Issue = ("Con-X Login Error"),
                Priority = Priority.High
            },
            new Ticket {
                UserID = users.Single(s => s.LastName == "Wan").UserID,
                CategoryID = categories.Single(c => c.CategoryName == "Desktop" ).CategoryID,
                Issue = ("Can't remote access C0123"),
                Priority = Priority.Med
            },
        };

命名空间中不存在类型或命名空间名称“DAL” “RecreationalServicesTicketingSystem”（您是否缺少程序集 参考？）

DAL\IssueContext.cs（来自 MVC4 的旧数据类上下文）

namespace RecreationalServicesTicketingSystem.DAL
{
    public class IssueContext : DbContext
    {
        public DbSet<User> Users { get; set; }
        public DbSet<Ticket> Tickets { get; set; }
        public DbSet<Category> Categories { get; set; }
        public DbSet<Department> Departments { get; set; }
        public DbSet<Depot> Depots { get; set; }


        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();

        }
    }
}

Models\IdentityModels.cs（带有标识的新类 MVC5

using Microsoft.AspNet.Identity;
using Microsoft.AspNet.Identity.EntityFramework;
using System.Data.Entity;
using System.Security.Claims;
using System.Threading.Tasks;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System;
using System.Collections.Generic;

namespace RecreationalServicesTicketingSystem.Models
    {
        public class ApplicationUser : IdentityUser
        {
            public async Task<ClaimsIdentity> 
                GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
            {
                var userIdentity = await manager
                    .CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
                return userIdentity;
            }

            public bool IsAdministrator { get; set; }
            [StringLength(50, MinimumLength = 1)]

            public string LastName { get; set; }
            [StringLength(50, MinimumLength = 1, ErrorMessage = "First name cannot be longer than 50 characters.")]

            [Column("FirstName")]
            public string FirstMidName { get; set; }

            public string FullName
            {
                get { return FirstMidName + " " + LastName; }
            }
            [DataType(DataType.Date)]
            [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
            public DateTime EnrollmentDate { get; set; }
            public int DepartmentID { get; set; }
            [ForeignKey("DepartmentID")]
            public virtual Department Department { get; set; }
            public int DepotID { get; set; }
            [ForeignKey("DepotID")]
            public virtual Depot Depot { get; set; }
            public virtual ICollection<Ticket> Tickets { get; set; }
        }


        public class ApplicationRole : IdentityRole
        {
            public ApplicationRole() : base() { }
            public ApplicationRole(string name) : base(name) { }
            public string Description { get; set; }

        }


        public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
        {
            public ApplicationDbContext()
                : base("DefaultConnection", throwIfV1Schema: false)
            {
            }


            public DbSet<Ticket> Tickets { get; set; }
            public DbSet<Category> Categories { get; set; }
            public DbSet<Department> Departments { get; set; }
            public DbSet<Depot> Depots { get; set; }

            static ApplicationDbContext()
            {
                Database.SetInitializer<ApplicationDbContext>(new ApplicationDbInitializer());
            }

            public static ApplicationDbContext Create()
            {
                return new ApplicationDbContext();
            }
        }
    }

Answer 1

您仍在引用旧的namespace 和类。您需要将其更改为新的上下文。既然您已经包含了 using RecreationalServicesTicketingSystem.Models，那么您需要做的就是删除旧的引用命名空间。

using System;
using System.Data.Entity;
using System.Data.Entity.Migrations;
using System.Linq;
using RecreationalServicesTicketingSystem.Models; // this is the namespace that has the new context
using System.Collections.Generic;

internal sealed class Configuration : DbMigrationsConfiguration<ApplicationDbContext> //References the new one now
{
    public Configuration()
    {
        AutomaticMigrationsEnabled = false;
    }

    protected override void Seed(ApplicationDbContext context)//References the new one now
    {...}
    //...other code removed for prebity
}