Model class and Mapping

问题

I have the Client class defined. I also have Mapping\ClientMap.cs file that defines column names using Fluent API. However, I am not sure how to "invoke" it as I don't see the ClientMap.cs code being executed.

I also have this:

namespace CardNumbers.Data
{
    public class Repository : DbContext, IRepository
    {
        public DbSet<Client> Clients { get; set; }
        public DbSet<ClientOrder> ClientOrders { get; set; }
        public DbSet<Reorder> Reorders { get; set; }
        public DbSet<Operator> Operators { get; set; }

which I know is not a very good practice, but that's how we were building the application with the instructor.

So, my question is - what do I need to add to make sure the Fluent API code is invoked in run-time?

Thanks in advance.

回答1:

The fluent mapping should be added at the bottom of your "Repository" class like this

protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        //add fluent api code
    }

The reason I am quoting your Repository is that you are not really implementing a repository pattern there. You should really have this defined as a specific DbContext, and then have a repository which can take multiple contexts. See this very well written post about implementing a repository: http://www.asp.net/mvc/tutorials/getting-started-with-ef-using-mvc/implementing-the-repository-and-unit-of-work-patterns-in-an-asp-net-mvc-application

回答2:

You should place your mapping code either directly in your OnModelCreating method (which is a virtual method you can override on DbContext), or place it in a sepearte configuration class which is then invoked from the OnModelCreating method.

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Entity<Client>().Property(p => p.Name).IsRequired();
}

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Configurations.Add(new ClientConfiguration());
}

Elsewhere:

public class ClientConfiguration : EntityTypeConfiguration<Client>
{
    public ClientConfiguration()
    {          
        this.Property(p => p.Name).IsRequired();
    }
}

来源：https://stackoverflow.com/questions/13000887/model-class-and-mapping

标签

entity-framework

fluent