MvcMiniProfiler Unable to cast object of type EFPr

Question

I am trying to integrate MvcMiniProfiler to my asp.net mvc+entity framewok project. Everything is ok for the first time web request but it is giving exception at the other requests.

My Project is
MVC 3
Entity Framework 4.1 (DatabaseFirst + POCO Generator DbContext)
MvcMiniProfiler.dll 1.9.0.0
MvcMiniProfiler.EntityFramework.dll 1.9.1.0
I install MvcMiniProfiler from Nu-Get

Added below to global.asax

    protected void Application_BeginRequest()
    {
        if (Request.IsLocal)
        {
            MvcMiniProfiler.MiniProfiler.Start();
            MiniProfilerEF.Initialize();       
        }
    }

Added below to web.config

   <system.data>
    <DbProviderFactories>
      <remove invariant="MvcMiniProfiler.Data.ProfiledDbProvider" />
      <add name="MvcMiniProfiler.Data.ProfiledDbProvider" invariant="MvcMiniProfiler.Data.ProfiledDbProvider" description="MvcMiniProfiler.Data.ProfiledDbProvider" type="MvcMiniProfiler.Data.ProfiledDbProviderFactory, MvcMiniProfiler, Version=1.8.0.0, Culture=neutral, PublicKeyToken=b44f9351044011a3" />
    </DbProviderFactories>
  </system.data>

I am getting this exception

    System.InvalidCastException was unhandled by user code
  Message=Unable to cast object of type 'MvcMiniProfiler.Data.EFProfiledDbConnection' to type 'System.Data.SqlClient.SqlConnection'.
  Source=System.Data
  StackTrace:
       at System.Data.SqlClient.SqlCommand.set_DbConnection(DbConnection value)
       at System.Data.Common.DbCommand.set_Connection(DbConnection value)
       at MvcMiniProfiler.Data.ProfiledDbCommand.set_DbConnection(DbConnection value) in C:\Users\sam\Desktop\mvc-mini-profiler\MvcMiniProfiler\Data\ProfiledDbCommand.cs:line 118
       at System.Data.Common.DbCommand.set_Connection(DbConnection value)
       at System.Data.Common.Utils.CommandHelper.SetStoreProviderCommandState(EntityCommand entityCommand, EntityTransaction entityTransaction, DbCommand storeProviderCommand)
       at System.Data.EntityClient.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)
       at System.Data.Objects.Internal.ObjectQueryExecutionPlan.Execute[TResultType](ObjectContext context, ObjectParameterCollection parameterValues)

Exception is occured in EF calls

ModaEntitiesWrapper.GetInstance().Articles
               .AsNoTracking()
               .Where(p => p.StatusId == 1).ToList();

If I change version of MvcMiniProfiler.Data.ProfiledDbProvider in Web.Config from 1.8.0.0 to 1.9.0.0 A new type of exception occured in MiniProfilerEF.Initialize() call.

System.IndexOutOfRangeException was unhandled by user code
  Message=The given DataRow is not in the current DataRowCollection.
  Source=System.Data
  StackTrace:
       at System.Data.DataRowCollection.Remove(DataRow row)
       at MvcMiniProfiler.MiniProfilerEF.Initialize() 

Answer 1

Check out http://code.google.com/p/mvc-mini-profiler/

Here's an example of how to use mvc-mini-profiler with EF Database First:

public static class Entities
{
    public static MyEntities Create()
    {
         var builder = new EntityConnectionStringBuilder(ConfigurationManager.ConnectionStrings["MyEntities"].ConnectionString);
         var sqlConnection = new SqlConnection(builder.ProviderConnectionString);
         var profiledConnection = new EFProfiledDbConnection(sqlConnection, MiniProfiler.Current);

         return profiledConnection.CreateObjectContext<MyEntities>();
    }
}

You can then register your entities with an IOC container using the method or alternatively use something like

using(var entities = Entities.Create())
{
    //Do stuff here
    entities.SaveChanges();
}

Edit: Forgot to add

MiniProfilerEF.Initialize();

That is only used for EF Code First.

Answer 2

Maybe this will help. Move the MiniProfilerEF.Initialize(); to the top of the method Application_Start(). Note that in EF 4.1 and higher the method called should be MiniProfilerEF.Initialize_EF42(); instead.

protected void Application_Start() {
    Logger.Info("Application start");
    MiniProfilerEF.Initialize_EF42();
    // ...
}