MapSingleType error

问题:

I create a project by MVC3 and use EFCode first for DataAccess Layer.

in my DataBase I have PackaginInfo Table, and in project I carete Package Class, this is my code:

public class Package
{
    public decimal PackageID { get; set; }
    public decimal Title { get; set; }
    public decimal Cost { get; set; }
    public bool isFree { get; set; }

}


public class ParandShopsEntities : DbContext
{       

    protected override void OnModelCreating(System.Data.Entity.ModelConfiguration.ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Package>().MapSingleType().ToTable("PackagingInfo"); 

    }

    public DbSet<Package> PackagingInfo { get; set; }
}

when i debug my project i get error: Error System.Data.Entity.ModelConfiguration.EntityTypeConfiguration' does not contain a definition for 'MapSingleType' and no extension method 'MapSingleType' accepting a first argument of type 'System.Data.Entity.ModelConfiguration.EntityTypeConfiguration' could be found (are you missing a using directive or an assembly reference?) E:\Projects\ein co\89-11-23\Parand\MvcApplication1\Models\ParandShopsEntities.cs

pls. help me

回答1:

In CTP5, you now just call

modelBuilder.Entity<Package>().ToTable("PackagingInfo"); 

回答2:

Or alternatively you can use TableAttribute data annotations:

[Table("PackagingInfo")]
public class Package
{
    public decimal PackageID { get; set; }
    public decimal Title { get; set; }
    public decimal Cost { get; set; }
    public bool isFree { get; set; }
} 

回答3:

Another thing to check is that you rebuilt all t4 templates. If you have changed navigation properties in the edmx file then you should rebuild your t4 templates, otherwise you may get this error.