ASP.NET identity with mysql instead of SQL Server null reference - asp.net-web-api

Question

I want to use the ASP.NET Web API to work with MySQL. I followed the steps described in:
https://learn.microsoft.com/en-us/aspnet/identity/overview/getting-started/aspnet-identity-using-mysql-storage-with-an-entityframework-mysql-provider
So what I did was the following:
Install the mysql connector and created a mysql database locally via workbench
Add the reference to mysql.data to the project
Via nuget manager the mysql.data.entity installed
The config did automatically added the mysql provider
Config:
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="mssqllocaldb" />
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient"
type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
<provider invariantName="MySql.Data.MySqlClient"
type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6, Version=6.10.8.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d">
</provider>
</providers>
</entityFramework>
I added the class MySqlInitializer:
public class MySqlInitializer : IDatabaseInitializer<ApplicationDbContext>
{
public void InitializeDatabase(ApplicationDbContext context)
{
if (!context.Database.Exists())
{
// if database did not exist before - create it
context.Database.Create();
}
else
{
// query to check if MigrationHistory table is present in the database
var migrationHistoryTableExists = ((IObjectContextAdapter)context).ObjectContext.ExecuteStoreQuery<int>(
"SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = 'IdentityMySQLDatabase' AND table_name = '__MigrationHistory'");
// if MigrationHistory table is not there (which is the case first time we run) - create it
if (migrationHistoryTableExists.FirstOrDefault() == 0)
{
context.Database.Delete();
context.Database.Create();
}
}
}
}
I changed the ApplicationDbContext to:
public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
static ApplicationDbContext()
{
Database.SetInitializer(new MySqlInitializer());
}
public ApplicationDbContext()
: base("DefaultConnection")
{
}
public static ApplicationDbContext Create()
{
return new ApplicationDbContext();
}
}
My connection string is:
<connectionStrings>
<add name="DefaultConnection"
connectionString="Database=IdentityMySQLDatabase;Data Source=localhost;User Id=root;Password=Admin!##"
providerName="MySql.Data.MySqlClient" />
</connectionStrings>
I'm using advanced rest client to test the api. But when I want to register a new user I get a null reference. This is my stacktrace:
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.GetEntitySetAndBaseTypeForType(Type entityType)
at System.Data.Entity.Internal.Linq.InternalSet1.Initialize() at
System.Data.Entity.Internal.Linq.InternalSet1.get_InternalContext()
at
System.Data.Entity.Infrastructure.DbQuery1.System.Linq.IQueryable.get_Provider()
at
System.Data.Entity.QueryableExtensions.FirstOrDefaultAsync[TSource](IQueryable1
source, Expression1 predicate, CancellationToken cancellationToken)
at
System.Data.Entity.QueryableExtensions.FirstOrDefaultAsync[TSource](IQueryable1
source, Expression1 predicate) at
Microsoft.AspNet.Identity.EntityFramework.UserStore6.d__67.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at
Microsoft.AspNet.Identity.TaskExtensions.CultureAwaiter1.GetResult()
at
Microsoft.AspNet.Identity.UserValidator2.d__14.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at
Microsoft.AspNet.Identity.UserValidator2.<ValidateAsync>d__13.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at
Microsoft.AspNet.Identity.UserManager2.d__73.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at
Microsoft.AspNet.Identity.UserManager2.<CreateAsync>d__79.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at System.Runtime.CompilerServices.TaskAwaiter1.GetResult() at
TestMYSQL.Controllers.AccountController.d__20.MoveNext() in
D:\Visual Studio
Projects\Private\TestMYSQL\TestMYSQL\Controllers\AccountController.cs:line
333 --- End of stack trace from previous location where exception was
thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at
System.Threading.Tasks.TaskHelpersExtensions.d__1`1.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at
System.Web.Http.Controllers.ApiControllerActionInvoker.d__1.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at
System.Web.Http.Controllers.ActionFilterResult.d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at
System.Web.Http.Filters.AuthorizationFilterAttribute.d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at
System.Web.Http.Controllers.AuthenticationFilterResult.d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at
System.Web.Http.Dispatcher.HttpControllerDispatcher.d__15.MoveNext()
Am I missing something? Any help would be appreciated. I have searched for a 2 days now and still no success of solving the issue.
Thanks.

Answer 1

After researching the possibilites. The solution was simpler then I thought. If someone, had the same problem here is what I did:
- Add new project mvc with identity for individual users login.
- Install nuget package Mysql.Data
- Install nuget package Mysql.Data.EntityFramework
- Create your own mysql database and get the connection string.
- Change the connection string and add the providername 'MySql.Data.MySqlClient'
Startup and register a username, the application creates a database in mysql for you.
I hope this well help someone who encountered the same problems.