找不到 object，因为它不存在或您在更新数据库时没有权限

Question

迁移成功，但在尝试更新数据库时，出现该错误。我之前遇到过类似的问题，因为我没有为 table 创建合适的 DbSet<>。这一次，不是这样。

我的数据库上下文：

using System;
using System.Collections.Generic;
using System.Text;
using ArtGalleries.Domain;
using Microsoft.EntityFrameworkCore;

namespace ArtGalleries.Data
{
    public class ArtGalleriesContext:DbContext
    {
        public ArtGalleriesContext(DbContextOptions<ArtGalleriesContext> options):base(options)
        {

        }

        public DbSet<ArtItem> ArtItems { get; set; }
        public DbSet<Artist> Artists { get; set; }
        public DbSet<Company> Companies { get; set; }
        public DbSet<Floor> Floors { get; set; }
        public DbSet<Location> Locations { get; set; }
        public DbSet<Room> Rooms { get; set; }
        public DbSet<User> Users { get; set; }






        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<UserLocation>()
                .HasKey(u => new {u.UserId, u.LocationId});
            //modelBuilder.Entity().
            //modelBuilder.Entity<Company>()
            //    .HasOne(c => c.Company)
            //    .WithOne(pc => pc.Company)
            //    .HasForeignKey(fk => fk.ParentId);
        }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            if (!optionsBuilder.IsConfigured)
            {
                optionsBuilder.UseSqlServer(
                    "Server=(localdb)\mssqllocaldb;Database=GalleriesDB;Trusted_Connection=True;");
            }
        }
    }
}

我的问题class：

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Text;

namespace ArtGalleries.Domain
{
    public class ArtItem
    {
        public string ArtType { get; set; }
        public Artist Artist { get; set; }
        public int ArtistId { get; set; }
        public int Depth { get; set; }
        public string Description { get; set; }
        public string Framing { get; set; }
        public int Height { get; set; }
        [Required]
        public int Id { get; set; }
        public Location Location { get; set; }
        [Required]
        public int LocationId { get; set; }
        public string Materials { get; set; }
        [Required]
        public string Name { get; set; }
        public User Owner { get; set; }
        public int OwnerId { get; set; }
        public string Picture { get; set; }
        public Room Room { get; set; }
        public int RoomId { get; set; }
        public string Technique { get; set; }
        public int Width { get; set; }
        public int YearOfAcquisition { get; set; }
        public int YearOfCreation { get; set; }
        public Status Status { get; set; }
    }
}

我不熟悉权限。我注意到一个类似的问题，建议该人找到 Up() 和 Down() 方法并使用它们。我没有这样的文件。这可能是因为他们的问题是由 EF 而不是 EF Core 生成的。类似问题标题：“找不到 object”dbo.xxxx“因为它不存在或您没有权限。”

Answer 1

这已通过删除迁移并添加新迁移解决，未对代码进行任何编辑。奇怪。

找不到 object，因为它不存在或您在更新数据库时没有权限

Cannot find the object because it does not exist or you do not have permissions when updating database

c#

asp.net-web-api

ef-core-2.2