If you follow the code from this blog http://blogs.msdn.com/b/adonet/archive/2011/03/15/ef-4-1-code-first-walkthrough.aspxthen you might hit the error “’ProjectName.Program+Category’ was not mapped. Check that the type has not been explicitly excluded by using the Ignore method or NotMappedAttribute data annotation.”
I repeat the code in below.
publicclassCategory
{
publicstring CategoryId { get; set; }
publicstring Name { get; set; }
publicvirtualICollection<Product> Products { get; set; }
}
publicclassProduct
{
publicint ProductId { get; set; }
publicstring Name { get; set; }
publicstring CategoryId { get; set; }
publicvirtual Category Category { get; set; }
}
publicclassProductContext : DbContext
{
public ProductContext()
{
}
public DbSet<Category> Categories { get; set; }
public DbSet<Product> Products { get; set; }
}
When comes to
static void Main(string[] args)
{
using (var db = new ProductContext())
{
// Add a food category
var food = new Category { CategoryId = “FOOD”, Name = “Foods” };
db.Categories.Add(food);
int recordsAffected = db.SaveChanges();
Console.WriteLine(
“Saved {0} entities to the database, press any key to exit.”,
recordsAffected);
Console.ReadKey();
}
}
The error will throw at the line using (var db = new ProductContext()).
Maybe when the blogger blogs the EF 4.1 the console project is able to run Code First code. In VS 2012 the console project will not run this code. The code can be run in Web project.
You can also download a single solution from http://skydrive.live.com. The sample file name is WebAppCodeFirst.rar My MSN ID is chanmmn@hotmail.com.
