EF 4.1 exception "The provider did not return a ProviderManifestToken string"
I am trying to replicate an example found on MSDN. I am using ASP.NET and EF 4.1 (CTP?). I've used NuGet to install the EntityFramework package.
I am getting this error: The provider did not return a ProviderManifestToken string ...
and the database is never created.
Here is my connection string:
<add name="HospitalContext"
connectionString=
"data source=.\SQLExpress;initial catalog=NewTestDB;integrated security=True;"
providerName="System.Data.SqlClient"/>
Here is my code:
var pat = new Patient { Name = "Shane123132524356436435234" };
db.Patients.Add(pat);
var labResult = new LabResult { Result = "bad", Patient = pat };
int recordAffected = db.SaveChanges();
Here is my context:
public class HospitalContext : DbContext
{
static HospitalContext()
{
Database.SetInitializer(new HostpitalContextInitializer());
}
public DbSet<Patient> Patients { get; set; }
public DbSet<LabResult> LabResults { get; set; }
}
public class HostpitalContextInitializer :
DropCreateDatabaseIfModelChanges<HospitalContext>
{
protected override void Seed(HospitalContext context)
{
context.Patients.Add(new Patient { Name = "Fred Peters" });
context.Patients.Add(new Patient { Name = "John Smith" });
context.Patients.Add(new Patient { Name = "Karen Fredricks" });
}
}
This is a fully patched SQL 2008 system, with VS 2010 SP1.
最佳答案