无法启用迁移

Question

当我运行启用迁移时显示该错误！ 我做了 SQLServer 的逆向工程，我想对我的数据做一些更改，我看到这个错误，谁引导我到配置上的第 10 行.cs这是由 Visual Studio 生成的构造函数(IAM 使用 Visual 2015(，SQL 连接器 6.9.4

Checking if the context targets an existing database...
System.TypeInitializationException: The type initializer for 'System.Data.Entity.Migrations.DbMigrationsConfiguration`1' threw an exception. ---> System.TypeLoadException: Inheritance security rules violated by type: 'MySql.Data.Entity.MySqlEFConfiguration'. Derived types must either match the security accessibility of the base type or be less accessible.
   at System.Reflection.CustomAttribute._CreateCaObject(RuntimeModule pModule, IRuntimeMethodInfo pCtor, Byte** ppBlob, Byte* pEndBlob, Int32* pcNamedArgs)
   at System.Reflection.CustomAttribute.CreateCaObject(RuntimeModule module, IRuntimeMethodInfo ctor, IntPtr& blob, IntPtr blobEnd, Int32& namedArgs)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeType type, RuntimeType caType, Boolean inherit)
   at System.RuntimeType.GetCustomAttributes(Type attributeType, Boolean inherit)
   at System.Attribute.GetCustomAttributes(MemberInfo element, Type type, Boolean inherit)
   at System.Reflection.CustomAttributeExtensions.GetCustomAttributes[T](MemberInfo element, Boolean inherit)
   at System.Data.Entity.Infrastructure.DependencyResolution.DbConfigurationFinder.TryFindConfigurationType(Assembly assemblyHint, Type contextTypeHint, IEnumerable`1 typesToSearch)
   at System.Data.Entity.Infrastructure.DependencyResolution.DbConfigurationManager.EnsureLoadedForAssembly(Assembly assemblyHint, Type contextTypeHint)
   at System.Data.Entity.Infrastructure.DependencyResolution.DbConfigurationManager.EnsureLoadedForContext(Type contextType)
   at System.Data.Entity.Migrations.DbMigrationsConfiguration`1..cctor()
   --- End of inner exception stack trace ---
   at System.Data.Entity.Migrations.DbMigrationsConfiguration`1..ctor()
   at Data.Migrations.Configuration..ctor() in C:Userssaif koutiDesktoppiski[pi_kouti]piskiDataMigrationsConfiguration.cs:line 10
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Data.Entity.Migrations.Utilities.MigrationsConfigurationFinder.FindMigrationsConfiguration(Type contextType, String configurationTypeName, Func`2 noType, Func`3 multipleTypes, Func`3 noTypeWithName, Func`3 multipleTypesWithName)
   at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.FindConfiguration()
   at System.Data.Entity.Migrations.Design.ToolingFacade.ScaffoldRunner.RunCore()
   at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.Run()
The type initializer for 'System.Data.Entity.Migrations.DbMigrationsConfiguration`1' threw an exception.

这是我的配置.cs

namespace Data.Migrations
{
    using System;
    using System.Data.Entity;
    using System.Data.Entity.Migrations;
    using System.Linq;
    internal sealed class Configuration : DbMigrationsConfiguration<iskiContext>
    {
        public Configuration()
        {
            AutomaticMigrationsEnabled = false;
        }
        protected override void Seed(Data.iskiContext context)
        {
            //  This method will be called after migrating to the latest version.
            //  You can use the DbSet<T>.AddOrUpdate() helper extension method 
            //  to avoid creating duplicate seed data.
        }
    }
}

这是我的背景

using System.Data.Entity;
using Domain.Models.Mapping;
using Domain.Models;
namespace Data
{
    [DbConfigurationType(typeof(MySql.Data.Entity.MySqlEFConfiguration))]
    public partial class iskiContext : DbContext
    {
        static iskiContext()
        {
            Database.SetInitializer<iskiContext>(null);
        }
        public iskiContext()
            : base("Name=iskiContext")
        {
        }
        public DbSet<accomodation> accomodations { get; set; }
        public DbSet<company> companies { get; set; }
        public DbSet<contract> contracts { get; set; }
        public DbSet<Event> events { get; set; }
        public DbSet<event_user> event_user { get; set; }
        public DbSet<organizerrequest> organizerrequests { get; set; }
        public DbSet<product> products { get; set; }
        public DbSet<products_user> products_user { get; set; }
        public DbSet<user> users { get; set; }
        public DbSet<user_company> user_company { get; set; }
        public DbSet<winner> winners { get; set; }
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Configurations.Add(new accomodationMap());
            modelBuilder.Configurations.Add(new companyMap());
            modelBuilder.Configurations.Add(new contractMap());
            modelBuilder.Configurations.Add(new eventMap());
            modelBuilder.Configurations.Add(new event_userMap());
            modelBuilder.Configurations.Add(new organizerrequestMap());
            modelBuilder.Configurations.Add(new productMap());
            modelBuilder.Configurations.Add(new products_userMap());
            modelBuilder.Configurations.Add(new userMap());
            modelBuilder.Configurations.Add(new user_companyMap());
            modelBuilder.Configurations.Add(new winnerMap());
        }
    }
}

Answer 1

检查迁移文件中的up((和down((方法。您的更改将在update-database命令后根据此向上和向下功能提交。否则，请AutomaticMigrationsEnabled = true