启用EF迁移时SpatialDbContext继承验证报错的解决求助

执行迁移启用命令：

Enable-Migrations -ContextTypeName SpatialSample.SpatialDbContext

出现错误提示：

The type 'SpatialDbContext' does not inherit from DbContext. The DbMigrationsConfiguration.ContextType property must be set to a type that inherits from DbContext.

但SpatialDbContext类确实继承自DbContext，相关代码如下：

//using Microsoft.EntityFrameworkCore;
using SpatialSample.Entities;
//using DbContext = Microsoft.EntityFrameworkCore.DbContext;
//using Microsoft.EntityFrameworkCore.Migrations;
//using GeoAPI.Geometries;
using NetTopologySuite;
using NetTopologySuite.Geometries;
using System;
//using System.Data.Entity;
using Microsoft.EntityFrameworkCore;
//using Microsoft.EntityFrameworkCore;
//using Microsoft.EntityFrameworkCore;
//using Coordinate = NetTopologySuite.Geometries.Coordinate;
//using Coordinate = GeoAPI.Geometries.Coordinate;
//using System.Data.Entity;
//using System.Data.Entity.Infrastructure;
//using Microsoft.AspNet.Identity.EntityFramework;

namespace SpatialSample
{
    public class SpatialDbContext : DbContext
    //DbContext
    {
        // public Microsoft.EntityFrameworkCore.DbSet<TouristAttraction> TouristAttractions { get; set; }
        // public DbSet<TouristAttraction> TouristAttractions { get; set; }
        public DbSet<TouristAttraction> TouristAttractions { get; set; }

        // public SpatialDbContext() : base() { }
        public SpatialDbContext(DbContextOptions options) : base(options) { }
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            var geometryFactory = NtsGeometryServices.Instance.CreateGeometryFactory(srid: 4326);
            //GeometryFactory gf = new GeometryFactory();

            modelBuilder.Entity<TouristAttraction>()
                .HasData(
                    new TouristAttraction
                    {
                        Id = 1,
                        Name1 = "Taj Mahal",
                        Location = (GeoAPI.Geometries.IPoint)geometryFactory.CreatePoint(new Coordinate(27.175015, 78.042155))
                    },
                    new TouristAttraction
                    {
                        Id = 2,
                        Name1 = "The Golden Temple of Amritsar",
                        Location = (GeoAPI.Geometries.IPoint)geometryFactory.CreatePoint(new Coordinate(31.619980, 74.876485))
                    },
                    new TouristAttraction
                    {
                        Id = 3,
                        Name1 = "The Red Fort, New Delhi",
                        Location = (GeoAPI.Geometries.IPoint)geometryFactory.CreatePoint(new Coordinate(28.656159, 77.241020))
                    },
                    new TouristAttraction
                    {
                        Id = 4,
                        Name1 = "The Gateway of India, Mumbai",
                        Location = (GeoAPI.Geometries.IPoint)geometryFactory.CreatePoint(new Coordinate(18.921984, 72.834654))
                    },
                    new TouristAttraction
                    {
                        Id = 5,
                        Name1 = "Mysore Palace",
                        Location = (GeoAPI.Geometries.IPoint)geometryFactory.CreatePoint(new Coordinate(12.305025, 76.655753))
                    },
                    new TouristAttraction
                    {
                        Id = 6,
                        Name1 = "Qutb Minar",
                        Location = (GeoAPI.Geometries.IPoint)geometryFactory.CreatePoint(new Coordinate(28.524475, 77.185521))
                    }
                );

        }
    }
}

• 切换到EF Core迁移命令：Enable-Migrations是EF6的命令，而你的代码使用的是EF Core的DbContext。EF Core无需提前启用迁移，直接使用以下命令：

  Add-Migration InitialCreate -Context SpatialSample.SpatialDbContext
  Update-Database -Context SpatialSample.SpatialDbContext
  

• 清理包与命名空间冲突：检查项目NuGet包，移除EF6相关的EntityFramework包，只保留EF Core系列包（如Microsoft.EntityFrameworkCore、Microsoft.EntityFrameworkCore.Tools等）。同时删除代码中被注释的EF6命名空间引用，避免潜在冲突。

• 确认启动项目与框架兼容：执行迁移命令时，确保选中的启动项目是包含SpatialDbContext的项目，且项目目标框架版本与所用EF Core包的兼容。

内容的提问来源于stack exchange，提问作者Bobin Scaria