Add-Migration not working with MySQL

问题

I have downloaded Asp.Net MVC 5.x Single page web application from https://aspnetboilerplate.com/Templates. I'm using MySQL and followed the steps mentioned in link https://aspnetboilerplate.com/Pages/Documents/EF-MySql-Integration. But when I run the Add-Migration command it gives the error.

MyCompany.MyProject.Web\Web.Config:

<add name="Default" connectionString="Server=127.0.0.1;port=3306;Database=SparTestDb;uid=root;password=root" providerName="MySql.Data.MySqlClient"/>

MyCompany.MyProject.EntityFramework\Migrations\Configuration.cs

public Configuration()
{
    AutomaticMigrationsEnabled = false;
    ContextKey = "Spar";

    SetSqlGenerator("MySql.Data.MySqlClient", new MySql.Data.Entity.MySqlMigrationSqlGenerator());
}

Error:

PM> Add-Migration "AbpZero_Initial" System.NullReferenceException: Object reference not set to an instance of an object. at MySql.Data.MySqlClient.MySqlProviderServices.GetDbProviderManifestToken(DbConnection connection) at System.Data.Entity.Core.Common.DbProviderServices.GetProviderManifestToken(DbConnection connection) at System.Data.Entity.Utilities.DbProviderServicesExtensions.GetProviderManifestTokenChecked(DbProviderServices providerServices, DbConnection connection) at System.Data.Entity.Infrastructure.DefaultManifestTokenResolver.<>c__DisplayClass1.b__0(Tuple3 k) at System.Collections.Concurrent.ConcurrentDictionary2.GetOrAdd(TKey key, Func2 valueFactory) at System.Data.Entity.Infrastructure.DefaultManifestTokenResolver.ResolveManifestToken(DbConnection connection) at System.Data.Entity.Utilities.DbConnectionExtensions.GetProviderInfo(DbConnection connection, DbProviderManifest& providerManifest) at System.Data.Entity.DbModelBuilder.Build(DbConnection providerConnection) at System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext) at System.Data.Entity.Internal.RetryLazy2.GetValue(TInput input) at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
at System.Data.Entity.Internal.InternalContext.Initialize() at System.Data.Entity.Internal.InternalContext.ForceOSpaceLoadingForKnownEntityTypes() at System.Data.Entity.DbContext.System.Data.Entity.Infrastructure.IObjectContextAdapter.get_ObjectContext() at Abp.EntityFramework.AbpDbContext.RegisterToChanges() at Abp.Zero.EntityFramework.AbpZeroDbContext3..ctor(String nameOrConnectionString) at MyCompany.MyProject.EntityFramework.SparDbContext..ctor() in C:\Users\MyName\Downloads\MyCompany.MyProject (1)\3.3.0\src\MyCompany.MyProject.EntityFramework\EntityFramework\SparDbContext.cs:line 19 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Data.Entity.Infrastructure.DbContextInfo.CreateInstance() at System.Data.Entity.Infrastructure.DbContextInfo..ctor(Type contextType, DbProviderInfo modelProviderInfo, AppConfig config, DbConnectionInfo connectionInfo, Func1 resolver) at System.Data.Entity.Migrations.DbMigrator..ctor(DbMigrationsConfiguration configuration, DbContext usersContext, DatabaseExistenceState existenceState, Boolean calledByCreateDatabase) at System.Data.Entity.Migrations.DbMigrator..ctor(DbMigrationsConfiguration configuration) at System.Data.Entity.Migrations.Design.MigrationScaffolder..ctor(DbMigrationsConfiguration migrationsConfiguration) at System.Data.Entity.Migrations.Design.ToolingFacade.ScaffoldRunner.RunCore() at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.Run() Object reference not set to an instance of an object. PM>

回答1:

MySql.Data version 6.9.11 is working well. Higher versions have problems. So, Try to use nuget.org/packages/MySql.Data/6.9.11. Or if you are using EF Core, you can use Npgsql.EntityFrameworkCore.PostgreSQL

来源：https://stackoverflow.com/questions/50132036/add-migration-not-working-with-mysql